Recording control device and method utilizing a test signal having multiple frequencies

• US 5,598,273 A
• Filed: 08/24/1995
• Issued: 01/28/1997
• Est. Priority Date: 07/17/1992
• Status: Expired due to Fees

• Current Assignee: Mitsubishi Denki Kabushiki Kaisha (Mitsubishi Electric Corporation)
• Original Assignee: Mitsubishi Denki Kabushiki Kaisha (Mitsubishi Electric Corporation)
• Inventors: Kanazawa, Yoshikazu, Kurisaki, Kazuhiro, Mimura, Yoshiaki
• Primary Examiner(s): Tran, Thai Q.
• Assistant Examiner(s): NGUYEN, HUY THANH
• Application Number:
  US08/519,014
• Time in Patent Office: 523 Days
• Field of Search: 358/335, 358/315, 358/330, 358/327, 358/310, 358/318, 360/27, 360/33.1, 360/9.1
• US Class Current: 386/201
• CPC Class Codes: G11B 27/36 Monitoring, i.e. supervising the progress of recording or reproducing for digital recording G11B20/00 and s.gr.; for monitoring, testing or measuring of TV recorders of the type covered by H04N5/76 and subgroups, see H04N17/06
• CPC Class Codes: G11B 5/035 Equalising
• CPC Class Codes: H04N 9/7936 by using a preemphasis network at the recording side and a deemphasis network at the reproducing side
• CPC Class Codes: H04N 9/83 the recorded chrominance signal occupying a frequency band under the frequency band of the recorded brightness signal

Abstract

In a magnetic recording control device, a plurality of test signals of different frequencies are recorded on and reproduced from a magnetic recording medium, and the reproduction levels of the test signals are detected. From the detection results, the frequency characteristics and electro-magnetic conversion characteristics of the magnetic recording medium are judged. A frequency correction in accordance with the judged frequency characteristics, and a record level correction in accordance with the judged electro-magnetic conversion characteristics are conducted on a video signal to be recorded.

Claims

1. A magnetic recording control device which controls frequency characteristics of a video signal to be recorded on a magnetic recording medium, comprising:

means for generating a plurality of test signals of different frequencies;

means for recording said plurality of test signals and said video signal on said magnetic recording medium;

means for reproducing said plurality of test signals and said video signal recorded on said magnetic recording medium;

means for detecting a reproduction level of each of said plurality of test signals; and

means for correcting frequency characteristics of said video signal into a corrected video signal prior to recording on said magnetic recording medium, on the basis of the detected reproduction levels, said means for recording receives said corrected video signal for storage in said magnetic recording medium.

2. A magnetic recording control device for a magnetic recording/reproduction apparatus where a test signal is recorded on a magnetic recording medium, the test signal is reproduced to detect characteristics of the magnetic recording medium, frequency characteristics of a video signal are corrected in accordance with the detected characteristics, and the video signal is recorded on the magnetic recording medium, said device comprising:

means for generating a plurality of test signals of different frequencies;

means for recording said plurality of test signals and said video signal on said magnetic recording medium;

means for reproducing said plurality of test signals and said vide signal recorded on said magnetic recording medium;

means for detecting a reproduction level of each of a plurality of recorded test signals;

instructing means for determining a correction amount of frequency characteristics as a function of the detected reproduction levels of said plurality of recorded test signals, and for instructing correction of said frequency characteristics; and

correcting means for correcting said video signal into a corrected video signal prior to recording on said magnetic recording medium, as a function of said correction amount of frequency characteristics determined by said instructing means, said means for recording receives said corrected video signal for storage in said magnetic recording medium thereby matching recording gain to frequency characteristics of said magnetic recording medium.

3. A magnetic recording control device for a magnetic recording/reproduction apparatus where a test signal is recorded on a magnetic recording medium, the test signal is reproduced to detect characteristics of the magnetic recording medium, frequency characteristics of a video signal are corrected in accordance with the detected characteristics, and the video signal is recorded on the magnetic recording medium, said device comprising:

clock signal generating means for generating a clock signal, said clock signal being used as a first test signal;

means for generating a second test signal by multiplying said clock signal by n, where n is an integer;

means for recording said first and second test signals and said video signal on said magnetic recording medium;

means for reproducing said first and second test signals and said video signal recorded on said magnetic recording medium;

means for detecting a reproduction level of each of a recorded first and second test signal;

instructing means for determining a correction amount of frequency characteristics as a function of the detected reproduction levels of said first and second recorded test signals, and for instructing correction of said frequency characteristics; and

correcting means for correcting said video signal into a corrected video signal prior to recording on said magnetic recording medium, as a function of said correction amount of frequency characteristics determined by said instructing means, said means for recording receives said corrected video signal for storage in said magnetic recording medium thereby matching recording gain to frequency characteristics of said magnetic recording medium.

4. A magnetic recording control device for a magnetic recording/reproduction apparatus where a test signal is recorded on a magnetic recording medium, the test signal is reproduced to detect characteristics of the magnetic recording medium, frequency characteristics of a video signal are corrected in accordance with the detected characteristics, and the video signal is recorded on the magnetic recording medium, said device comprising:

a color processing unit generating a chrominance signal including a subcarrier frequency signal, said subcarrier frequency signal being used as a first test signal;

means for generating a second test signal by multiplying said subcarrier frequency signal by n, where n is an integer;

means for recording said first and second test signals and said video signal on said magnetic recording medium;

means for reproducing said first and second test signals and said video signal recorded on said magnetic recording medium;

means for detecting a reproduction level of each of a first and second recorded test signals;

instructing means for determining a correction amount of frequency characteristics as a function of the detected reproduction levels of said first and second recorded test signals, and for instructing correction of said frequency characteristics; and

correcting means for correcting said video signal into a corrected video signal prior to recording on said magnetic recording medium, as a function of said correction amount of frequency characteristics determined by said instructing means, said means for recording receives said corrected video signal for storage in said magnetic recording medium thereby matching recording gain to frequency characteristics of said magnetic recording medium.

5. A magnetic recording control device for a magnetic recording/reproduction apparatus where a test signal is recorded on a magnetic recording medium, the test signal is reproduced to detect characteristics of the magnetic recording medium, frequency characteristics of a video signal are corrected in accordance with the detected characteristics, and the video signal is recorded on the magnetic recording medium, said device comprising:

clock signal generating means for generating a clock signal, said clock signal being used as a first test signal;

means for generating a second test signal by dividing said clock signal by n, where n is an integer;

means for recording said first and second test signals and said video signal on said magnetic recording medium;

means for reproducing said first and second test signals and said video signal recorded on said magnetic recording medium;

means for detecting a reproduction level of each of a first and second recorded test signals;

instructing means for determining a correction amount of frequency characteristics as a function of the detected reproduction levels of said first and second recorded test signals, and for instructing correction of said frequency characteristics; and

correcting means for correcting said video signal into a corrected video signal prior to recording on said magnetic recording medium, as a function of said correction amount of frequency characteristics determined by said instructing means, said means for recording receives said corrected video signal for storage in said magnetic recording medium thereby matching recording gain to frequency characteristics of said magnetic recording medium.

6. A magnetic recording control device for a magnetic recording/reproduction apparatus where a test signal is recorded on a magnetic recording medium, the test signal is reproduced to detect characteristics of the magnetic recording medium, frequency characteristics of a video signal are corrected in accordance with the detected characteristics, and the video signal is recorded on the magnetic recording medium, said device comprising;

a color processing unit generating a chrominance signal including a subcarrier frequency signal, said subcarrier frequency signal being used as a first test signal;

means for generating a second test signal by dividing said subcarrier frequency signal by n, where n is an integer;

means for recording said first and second test signals and said video signal on said magnetic recording medium;

means for reproducing said first and second test signals and said video signal recorded on said magnetic recording medium;

means for detecting a reproduction level of each of a first and second recorded test signals;

instructing means for determining a correction amount of frequency characteristics as a function of the detected reproduction levels of said first and second recorded test signals, and for instructing correction of said frequency characteristics; and

correcting means for correcting said video signal into a corrected video signal prior to recording on said magnetic recording medium, as a function of said correction amount of frequency characteristics determined by said instructing means, said means for recording receives said corrected video signal for storage in said magnetic recording medium thereby matching recording gain to frequency characteristics of said magnetic recording medium.

7. A magnetic recording control device which controls a record level of a first video signal to be recorded on a magnetic recording medium, comprising:

frequency modulating means for conducting a frequency modulation on a luminance signal separated from said first video signal;

first test signal generating means for generating a first test signal of a frequency within a range of the frequency of said luminance signal which is frequency modulated in said frequency modulating means;

second test signal generating means for generating a second test signal of a frequency within a range of the frequency of a color signal which is separated from said first video signal and is subjected to a low frequency conversion;

mixing means for mixing said first and second test signals generated by said first and second test signal generating means, and for mixing said luminance signal and said color signal to form a second video signal;

recording means for recording said test signals and said second video signal on said magnetic recording medium while frequency-multiplexing said test signals;

reproducing means for reproducing said test signals and said second video signal recorded by said recording means;

detecting means for detecting reproduction levels of said test signals reproduced by said reproducing means; and

correcting means for correcting a record level of said luminance signal and said color signal into a corrected luminance signal and a corrected color signal, respectively, on the basis of said reproduction levels detected by said detecting means, said recording means receives said corrected luminance signal and said corrected color signal for storage in said magnetic medium.

8. A magnetic recording control device according to claim 7, wherein said correcting means comprises:

judging means for judging electro-magnetic conversion characteristics of the low frequency converted color signal and/or the frequency modulated luminance signal, from the reproduction levels detected by said detecting means; and

means for correcting a record level of the low frequency converted color signal and/or the frequency modulated luminance signal, on the basis or judging results of electro-magnetic conversion characteristics by said judging means.

9. A magnetic recording control device which controls a record level of a video signal to be recorded on a magnetic recording medium, comprising:

means for separating the video signal into a luminance signal and a color signal;

means for conducting the frequency modulation on the separated luminance signal;

first test signal generating means for generating a test signal of a frequency within a range of the frequency modulated luminance signal;

means for conducting the low frequency conversion on the separated color signal;

second test signal generating means for generating a test signal of a frequency within a range of the low frequency converted color signal;

recording means for mixing the test signals generated by said first and second test signal generating means, and for recording the test signals on the magnetic recording medium while frequency-multiplexing the test signals and for mixing the frequency modulated luminance signal with the low frequency converted color signal to create a video signal, and for recording the video signal on the magnetic recording medium while frequency multi-plexing the signals;

reproducing means for, when the test signals are recorded on the magnetic recording medium by said recording means for a predetermined time period, reproducing the test signals from the magnetic recording medium;

detecting means for detecting reproduction levels of the reproduced test signals;

memory means for storing the reproduction levels of the reproduced test signals detected by said detecting means;

judging means for judging electro-magnetic conversion characteristics of the low frequency converted color signal, from the contents of said memory means; and

correcting means for correcting a record level of the low frequency converted color signal, on the basis of judging results by said judging means.

10. A magnetic recording control device according to claim 9, wherein said judging means further judges electro-magnetic conversion characteristics of the frequency modulated luminance signal, from the contents of said memory means, and said correcting means further corrects a record level of the frequency modulated luminance signal, on the basis of judging results by said judging means.

11. A magnetic recording control device which controls a record level of a video signal to be recorded on a magnetic recording medium, comprising:

frequency modulating means for conducting the frequency modulation on a luminance signal separated from the video signal;

converting means for low frequency converting a color signal separated from the video signal;

recording means for mixing the frequency modulated luminance signal with the low frequency converted color signal to create a video signal, and for recording the video signal on the magnetic recording medium while frequency-multiplexing the video signal;

first detecting means for detecting a reproduction level of the luminance signal by gating a synchronizing signal portion while performing the reproduction on the magnetic recording medium on which the recording has been conducted by said recording means;

second detecting means for detecting a reproduction level of the color signal by gating a burst signal portion while performing the reproduction on the magnetic recording medium on which the recording has been conducted by said recording means;

memory means for storing the reproduction level of the luminance signal detected by said first detecting means, and the reproduction level of the color signal detected by said second detecting means;

judging means for judging electro-magnetic conversion characteristics of the luminance signal and color signal, from the contents of said memory means; and

means for changing a record level of the frequency modulated luminance signal and a record level of the low frequency converted color signal, on the basis of judging results of electro-magnetic conversion characteristics of the luminance signal and color signal by said judging means.

12. A method for recording a video image stored on a tape, comprising the steps of:

(a) recording a multiple frequency test signal onto said tape, said multiple frequency test signal including at least a first frequency part and a second frequency part;

(b) reproducing said multiple frequency test signal from said tape;

(c) separating said first frequency part from said multiple frequency test signal reproduced in said step (b) to create a first frequency signal;

(d) separating said second frequency part from said multiple frequency test signal reproduced in said step (b) to create a second frequency signal;

(e) detecting levels of said first and second frequency signals;

(f) adjusting a record level of image signals prior to recording of said image signals on said tape as a function of said levels of said first and second frequency signals detected in said step (e); and

(g) recording said image signals adjusted in said step (f) on said tape.

13. The method of claim 12, further including:

(h) concurrent with step (a), recording an index signal on the tape;

(i) reading the index signal from the tape while rewinding the tape; and

(j) stopping rewinding of the tape in response to the index signal read in step (i).

14. The method of claim 12, wherein

step (a) includes generating a second frequency part by multiplying the frequency of the first frequency part by two.

15. The method of claim 12, wherein

step (a) includes generating a second frequency part by dividing the frequency of the first frequency part by two.

16. The method of claim 12, wherein step (a) includes:

(a1) generating the first frequency signal having a frequency within the range of a luminance signal frequency;

(a2) generating the second frequency signal having a frequency within the range of a color signal frequency; and

(a3) multiplexing the first and second frequency signals.

17. The method of claim 16, wherein

step (a1) includes generating the first frequency signal utilizing a first test signal generator circuit;

and

step (a2) includes generating the second frequency signal by utilizing a second test signal generator circuit.

18. The method of claim 16, wherein

said step (a1) includes the substep of

filtering said first frequency signal from a luminance signal, and said step (a2) includes the substep of

filtering said second frequency signal from a color signal.

19. The method of claim 18, wherein

said step (a1) includes the substep of

filtering said first frequency signal from said luminance signal with a high pass filter;

and

said step (a2) includes the substep of

filtering said second frequency signal from said color signal with a low pass filter.

20. The method of claim 12, wherein

step (a) includes recording a multiple frequency test signal having a signal of the first frequency mixed with a signal of the second frequency.

21. The method of claim 12, wherein step (f) includes adjusting record levels of a color signal and a luminance signal.

22. The method of claim 16, wherein step (f) includes adjusting record levels of a luminance signal and a color signal in response to said levels of said first and second frequency signals detected in said step (e), respectively.

23. A video tape recorder comprising:

a record equalizer, having an input video signal as an input and having an equalized video signal as an output;

a multiple frequency test signal generator, having a multiple frequency test signal as an output;

at least one switch, having an input connected to one of said record equalizer and said multiple frequency test signal generator and having a switch output signal;

at least one head, receiving and recording the switch output signal, and reading a recorded signal on the tape to output a head output signal;

a reproduction equalizer, having the head output signal as an input and having an equalized head output signal as an output;

at least first and second level detectors, having the equalized head output signal as an input,

said first level detector detecting a first frequency record level and outputting a first frequency record level signal indicative of the record level of a signal of a first frequency,

said second level detector detecting a second frequency record level and outputting a second frequency record level signal indicative of the record level of a second frequency; and

a level determiner, having the first and second frequency record level signals as inputs, determining the record levels of multiple frequencies of the video input signal as a function of the first and second frequency record level signals and having a level output signal, connected to said record equalizer.

24. The video tape recorder of claim 23, wherein

said record equalizer includes at least first and second record level controllers, each record level controller being responsive to said level output signal to control the record level of a different frequency range of the video input signal.

25. The video tape recorder of claim 24, wherein

said first record level controller controls the record level of a color signal frequency range;

and

said second record level controller controls the record level of a luminance signal frequency range.

26. The video tape recorder of claim 25, wherein

said record equalizer substantially consists of said first and second record level controllers.

27. The video tape recorder of claim 26 including only two level detectors.

28. The video tape recorder of claim 23 wherein

said multiple frequency test signal generator has an output of signals of the first and second frequency multiplexed.

29. The video tape recorder of claim 25, further comprising:

a mix circuit interposed between said at least one switch and said at least one head; and

wherein

said multiple frequency test signal generator has an output of a signal of the first frequency and a signal of the second frequency;

said at least one switch includes only first and second switches,

said first switch controlled to connect the signal of the first frequency from said multiple frequency test signal generator and the color signal from said first record level controller to said mix circuit, and

said second switch controlled to connect the signal of the second frequency from said multiple frequency test signal generator and the luminance signal from said second record level controller to said mix circuit; and

said mix circuit mixes the signals of the first and second frequencies and mixes the color signal and the luminance signal.

30. The video tape recorder of claim 28, wherein

said level determiner includes a microcomputer and a memory storing the first and second frequency record levels.

31. The video tape recorder of claim 24, wherein

said reproduction equalizer includes a low pass filter and a high pass filter;

and

said first and second level detectors respectively receive an output from said low pass filter and said high pass filter.

32. A video tape recorder, comprising:

a record equalizer, having a multiple frequency test signal and an input video signal as an input and having an equalized signal as an output;

at least one head, receiving and recording the equalized signal, and reading a recorded signal on the tape to output a head output signal;

a reproduction equalizer, having the head output signal as an input and having an equalized head output signal as an output;

at least first and second level detectors, having the equalized head output signal as an input,

said first level detector detecting a first frequency record level and outputting a first frequency record level signal indicative of the record level of a signal of a first frequency,

said second level detector detecting a second frequency record level and outputting a second frequency record level signal indicative of the record level of a second frequency; and

a level determiner, having the first and second frequency record level signals as inputs, determining the record levels of multiple frequencies of the video input signal as a function of at least the first and second frequency record level signals and having a level output signal, connected to said record equalizer;

wherein said record equalizer adjusts the level of recording of multiple frequency ranges of the input video signal in response to the level output signal.

33. A magnetic recording control device for correcting frequency characteristics of a video signal to be recorded on a magnetic recording medium, comprising:

a test signal generator generating test signals based on a clock signal;

recording unit recording said test signals on said magnetic recording medium;

reproducing unit reproducing said recorded test signals;

detecting unit detecting reproduction levels of said reproduced test signals; and

correcting unit correcting frequency characteristics of said video signal based on said detected reproduction levels, wherein

said recording unit records said corrected video signal on said magnetic recording medium.

34. A magnetic recording control device for correcting frequency characteristics of a video signal to be recorded on a magnetic recording medium, comprising:

a test signal generator generating test signals based on a subcarrier frequency signal of a chrominance signal;

recording unit recording said test signals on said magnetic recording medium;

reproducing unit reproducing said recorded test signals;

detecting unit detecting reproduction levels of said reproduced test signals; and

correcting unit correcting frequency characteristics of said video signal based on said detected reproduction levels, wherein

said recording unit records said corrected video signal on said magnetic recording medium.

35. A method for controlling frequency characteristics of a video signal to be recorded on a magnetic recording medium, comprising:

generating a plurality of test signals of different frequencies;

recording said plurality of test signals and said video signal on said magnetic recording medium;

reproducing said plurality of test signals and said video signal recorded on said magnetic recording medium;

detecting a reproduction level of each of said plurality of test signals; and

correcting frequency characteristics of said video signal into a corrected video signal prior to recording on said magnetic recording medium, on the basis of said detected reproduction levels, wherein said corrected video signal is received for storage in said magnetic recording medium in said recording step.

36. A method for controlling a magnetic recording/reproduction apparatus, comprising:

generating a plurality of test signals of different frequencies;

recording said plurality of test signals and a video signal on said magnetic recording medium;

reproducing said plurality of test signals and said video signal recorded on said magnetic recording medium;

detecting a reproduction level of each of a plurality of recorded test signals;

determining a correction amount of frequency characteristics as a function of said detected reproduction levels of said plurality of recorded test signals;

instructing correction of said frequency characteristics; and

correcting said video signal into a corrected video signal prior to recording on said magnetic recording medium, as a function of said determined correction amount of frequency characteristics, wherein said corrected video signal is received for storage in said magnetic recording medium in said recording step thereby matching recording gain to frequency characteristics of said magnetic recording medium.

37. A method for controlling a magnetic recording/reproduction apparatus, comprising:

generating a clock signal, said clock signal being used as a first test signal;

generating a second test signal by multiplying said clock signal by n, where n is an integer;

recording said first and second test signals and a video signal on said magnetic recording medium;

reproducing said first and second test signals and said video signal recorded on said magnetic recording medium;

detecting a reproduction level of each of a recorded first and second test signals;

determining a correction amount of frequency characteristics as a function of said detected reproduction levels of said first and second recorded test signals, and instructing correction of said frequency characteristics; and

correcting said video signal into a corrected video signal prior to recording on said magnetic recording medium, as a function of said determined correction amount of frequency characteristics, wherein said corrected video signal is received for storage in said magnetic recording medium in said recording step thereby matching recording gain to frequency characteristics of said magnetic recording medium.

38. A method for controlling a magnetic recording/reproduction apparatus, comprising:

generating a chrominance signal including a subcarrier frequency signal, said subcarrier frequency signal being used as a first test signal;

generating a second test signal by multiplying said subcarrier frequency signal by n, where n is an integer;

recording said first and second test signals and a video signal on said magnetic recording medium;

reproducing said first and second test signals and said video signal recorded on said magnetic recording medium;

a detecting unit detecting a reproduction level of each of a first and second recorded test signals;

determining a correction amount of frequency characteristics as a function of said detected reproduction levels of said first and second recorded test signals, and instructing correction of said frequency characteristics; and

correcting said video signal into a corrected video signal prior to recording on said magnetic recording medium, as a function of said determined correction amount of frequency characteristics, wherein said corrected video signal is received for storage in said magnetic recording medium in said recording step thereby matching recording gain to frequency characteristics of said magnetic recording medium.

39. A method for controlling a magnetic recording/reproduction apparatus, comprising:

generating a clock signal, said clock signal being used as a first test signal;

generating a second test signal by dividing said clock signal by n, where n is an integer;

recording said first and second test signals and a video signal on said magnetic recording medium;

reproducing said first and second test signals and said video signal recorded on said magnetic recording medium;

detecting a reproduction level of each of a first and second recorded test signals;

determining a correction amount of frequency characteristics as a function of said detected reproduction levels of said first and second recorded test signals, instructing correction of said frequency characteristics; and

correcting said video signal into a corrected video signal prior to recording on said magnetic recording medium, as a function of said determined correction amount of frequency characteristics, wherein said corrected video signal is received for storage in said magnetic recording medium thereby matching recording gain to frequency characteristics of said magnetic recording medium.

40. A method for controlling a magnetic recording/reproduction apparatus, comprising:

generating a chrominance signal including a subcarrier frequency signal, said subcarrier frequency signal being used as a first test signal;

generating unit generating a second test signal by dividing said subcarrier frequency signal by n, where n is an integer;

recording said first and second test signals and a video signal on said magnetic recording medium;

reproducing said first and second test signals and said video signal recorded on said magnetic recording medium;

detecting a reproduction level of each of a first and second recorded test signals;

determining a correction amount of frequency characteristics as a function of said detected reproduction levels of said first and second recorded test signals, instructing correction of said frequency characteristics; and

correcting said video signal into a corrected video signal prior to recording on said magnetic recording medium, as a function of said determined correction amount of frequency characteristics, wherein said corrected video signal is received for storage in said magnetic recording medium in said recording step thereby matching recording gain to frequency characteristics of said magnetic recording medium.

41. A magnetic recording/reproduction apparatus, comprising:

an input device receiving a video signal to be recorded on a recording medium; and

a magnetic recording control device controlling frequency characteristics of said video signal, said magnetic recording control device including,

a test signal generating unit generating a plurality of test signals of different frequencies,

a recording unit recording said plurality of test signals and said video signal on said magnetic recording medium,

a reproducing unit reproducing said plurality of test signals and said video signal recorded on said magnetic recording medium,

a detecting unit detecting a reproduction level of each of said plurality of test signals, and

a correcting unit correcting frequency characteristics of said video signal into a corrected video signal prior to recording on said magnetic recording medium, on the basis of the detected reproduction levels, said recording unit receives said corrected video signal for storage in said magnetic recording medium.

42. A magnetic recording/reproduction apparatus, comprising:

an input device receiving a video signal to be recorded on a recording medium; and

a magnetic recording control device controlling frequency characteristics of said video signal said magnetic recording device including,

a test signal generating unit generating a plurality of test signals of different frequencies,

a recording unit recording said plurality of test signals and said video signal on said magnetic recording medium,

a reproducing unit reproducing said plurality of test signals and said video signal recorded on said magnetic recording medium,

a detecting unit detecting a reproduction level of each of a plurality of recorded test signals,

an instructing unit determining a correction amount of frequency characteristics as a function of said detected reproduction levels of said plurality of recorded test signals, and instructing correction of said frequency characteristics, and

a correcting unit correcting said video signal into a corrected video signal prior to recording on said magnetic recording medium, as a function of said correction amount of frequency characteristics determined by said instructing unit, said recording unit receives said corrected video signal for storage in said magnetic recording medium thereby matching recording gain to frequency characteristics of said magnetic recording medium.

43. A magnetic recording/reproduction apparatus, comprising:

an input device receiving a video signal to be recorded on a recording medium; and

a magnetic recording control device controlling frequency characteristics of said video signal said magnetic recording device including,

a clock signal generator generating a clock signal, said clock signal being used as a first test signal,

a test signal generator generating a second test signal by multiplying said clock signal by n, where n is an integer,

a recording unit recording said first and second test signals and said video signal on said magnetic recording medium,

a reproducing unit reproducing said first and second test signals and said video signal recorded on said magnetic recording medium,

a detecting unit detecting a reproduction level of each of a recorded first and second test signals,

an instructing unit for determining a correction amount of frequency characteristics as a function of said detected reproduction levels of said first and second recorded test signals, and instructing correction of said frequency characteristics, and

a correcting unit correcting said video signal into a corrected video signal prior to recording on said magnetic recording medium, as a function of said correction amount of frequency characteristics determined by said instructing unit, said recording unit receives said corrected video signal for storage in said magnetic recording medium thereby matching recording gain to frequency characteristics of said magnetic recording medium.

44. A magnetic recording/reproduction apparatus, comprising:

an input device receiving a video signal to be recorded on a recording medium; and

a magnetic recording control device controlling frequency characteristics of said video signal said magnetic recording device including,

a color processing unit generating a chrominance signal including a subcarrier frequency signal, said subcarrier frequency signal being used as a first test signal,

a test signal generating unit generating a second test signal by multiplying said subcarrier frequency signal by n, where n is an integer,

a recording unit recording said first and second test signals and said video signal on said magnetic recording medium,

a reproducing unit reproducing said first and second test signals and said video signal recorded on said magnetic recording medium,

a detecting unit detecting a reproduction level of each of a first and second recorded test signals,

an instructing unit determining a correction amount of frequency characteristics as a function of said detected reproduction levels of said first and second recorded test signals, and instructing correction of said frequency characteristics, and

a correcting unit correcting said video signal into a corrected video signal prior to recording on said magnetic recording medium, as a function of said correction amount of frequency characteristics determined by said instructing unit, said recording unit receives said corrected video signal for storage in said magnetic recording medium thereby matching recording gain to frequency characteristics of said magnetic recording medium.

45. A magnetic recording/reproduction apparatus, comprising:

an input device receiving a video signal to be recorded on a recording medium; and

a magnetic recording control device controlling frequency characteristics of said video signal, said magnetic recording device including,

a clock signal generator generating a clock signal, said clock signal being used as a first test signal,

a test signal generating unit generating a second test signal by dividing said clock signal by n, where n is an integer,

a recording unit recording said first and second test signals and said video signal on said magnetic recording medium,

a reproducing unit reproducing said first and second test signals and said video signal recorded on said magnetic recording medium,

a detecting unit detecting a reproduction level of each of a first and second recorded test signals,

an instructing unit determining a correction amount of frequency characteristics as a function of said detected reproduction levels of said first and second recorded test signals, and instructing correction of said frequency characteristics, and

a correcting unit correcting said video signal into a corrected video signal prior to recording on said magnetic recording medium, as a function of said correction amount of frequency characteristics determined by said instructing unit, said recording unit receives said corrected video signal for storage in said magnetic recording medium thereby matching recording gain to frequency characteristics of said magnetic recording medium.

46. A magnetic recording/reproduction apparatus, comprising:

an input device receiving a video signal to be recorded on a recording medium; and

a magnetic recording control device controlling frequency characteristics of said video signal, said magnetic recording device including,

a color processing unit generating a chrominance signal including a subcarrier frequency signal, said subcarrier frequency signal being used as a first test signal,

a test signal generating unit generating a second test signal by dividing said subcarrier frequency signal by n, where n is an integer,

a recording unit recording said first and second test signals and said video signal on said magnetic recording medium,

a reproducing unit reproducing said first and second test signals and said video signal recorded on said magnetic recording medium,

a detecting unit detecting a reproduction level of each of a first and second recorded test signals,

an instructing unit determining a correction amount of frequency characteristics as a function of said detected reproduction levels of said first and second recorded test signals, and instructing correction of said frequency characteristics, and

a correcting unit correcting said video signal into a corrected video signal prior to recording on said magnetic recording medium, as a function of said correction amount of frequency characteristics determined by said instructing unit, said recording unit receives said corrected video signal for storage in said magnetic recording medium thereby matching recording gain to frequency characteristics of said magnetic recording medium.