Recording control device and method utilizing a test signal having multiple frequencies
First Claim
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.
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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.
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Citations
46 Claims
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1. A magnetic recording control device which controls frequency characteristics of a video signal to be recorded on a magnetic recording medium, comprising:
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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.
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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:
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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.
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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:
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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.
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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:
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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.
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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:
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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.
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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;
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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.
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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:
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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. - View Dependent Claims (8)
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9. A magnetic recording control device which controls a record level of a video signal to be recorded on a magnetic recording medium, comprising:
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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. - View Dependent Claims (10)
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11. A magnetic recording control device which controls a record level of a video signal to be recorded on a magnetic recording medium, comprising:
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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.
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12. A method for recording a video image stored on a tape, comprising the steps of:
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(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. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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23. A video tape recorder comprising:
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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. - View Dependent Claims (24, 25, 26, 27, 28, 29, 30, 31)
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32. A video tape recorder, comprising:
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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.
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33. A magnetic recording control device for correcting frequency characteristics of a video signal to be recorded on a magnetic recording medium, comprising:
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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.
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34. A magnetic recording control device for correcting frequency characteristics of a video signal to be recorded on a magnetic recording medium, comprising:
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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.
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35. A method for controlling frequency characteristics of a video signal to be recorded on a magnetic recording medium, comprising:
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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.
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36. A method for controlling a magnetic recording/reproduction apparatus, comprising:
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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.
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37. A method for controlling a magnetic recording/reproduction apparatus, comprising:
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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.
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38. A method for controlling a magnetic recording/reproduction apparatus, comprising:
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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.
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39. A method for controlling a magnetic recording/reproduction apparatus, comprising:
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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.
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40. A method for controlling a magnetic recording/reproduction apparatus, comprising:
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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.
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41. A magnetic recording/reproduction apparatus, comprising:
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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.
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42. A magnetic recording/reproduction apparatus, comprising:
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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.
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43. A magnetic recording/reproduction apparatus, comprising:
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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.
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44. A magnetic recording/reproduction apparatus, comprising:
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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.
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45. A magnetic recording/reproduction apparatus, comprising:
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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.
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46. A magnetic recording/reproduction apparatus, comprising:
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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.
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Specification