Video signal recording/reproducing apparatus

• US 5,214,515 A
• Filed: 12/31/1991
• Issued: 05/25/1993
• Est. Priority Date: 10/28/1986
• Status: Expired due to Term

• Current Assignee: Mitsubishi Denki Kabushiki Kaisha (Mitsubishi Electric Corporation)
• Original Assignee: Mitsubishi Denki Kabushiki Kaisha (Mitsubishi Electric Corporation)
• Inventors: Fujii, Toshifumi, Inoue, Sadayuki
• Primary Examiner(s): YOUNG, WAYNE R
• Application Number:
  US07/816,844
• Time in Patent Office: 511 Days
• Field of Search: 360/10.1-10.3, 360/23, 360/33.1, 360/64, 360/73.01, 360/73.04, 360/73.05, 360/73.08, 358/335-338
• US Class Current: 386/205
• CPC Class Codes: G11B 15/1875 adaptations for special effects or editing signal processing or indexing therefor G11B27/00
• CPC Class Codes: G11B 2220/90 Tape-like record carriers
• CPC Class Codes: G11B 27/005 Reproducing at a different information rate from the information rate of recording for television signals H04N5/783
• CPC Class Codes: G11B 5/0086 using cyclically driven heads providing segmented tracks
• CPC Class Codes: H04N 5/783 Adaptations for reproducing at a rate different from the recording rate
• CPC Class Codes: H04N 5/937 by assembling picture element blocks in an intermediate store

Abstract

A reproducing apparatus adapted to a video signal recording/reproducing apparatus for reproducing a video signal recorded on a record medium in the form of an L-channel/S-segment recording system. The record medium travelling speed in production, the output from comparators and the guard band width are adjusted so that writing of the video signal in a field memory is effected so as not to cause omission of any portion of the video signal. Four embodiments are disclosed.

Claims

1. A video signal recording and reproducing apparatus wherein a video signal of one field period, including a synchronization signal, is recorded on a plurality of tracks on a recording medium in an L-channel/S-segment recording system, L and S being respectively positive integers which are never simultaneously equal to one, comprising:

at least one rotating reproducing head provided for each of the L-channels for reproducing a video signal on said recording medium;

processor means coupled to said rotating reproduction head for demodulating the video signal reproduced by said rotating reproduction head and detecting the synchronization signal from the video signal, said processor means outputting the demodulated video signal and said synchronization signal;

storing means capable of storing a video signal of at least one field period for storing the video signal output from said processor means;

storage control means for controlling said storing means so that the video signal is written in said storing means in synchronism with the detected synchronization signal when the level of the reproduced video signal exceeds a predetermined level and so that the video signal is read out in asynchronism with the synchronization signal; and

recording medium travel control means for selecting the traveling speed of said recording medium so that in the case of high speed playback, said recording medium travel control means selects the traveling speed of said recording medium to be (N+m/M) times the recording speed, N being equal to 0, ±

1, ±

2, . . . , and m and M being positive integers having no common divisor except one and so that no integer r exists which satisfies the equation (N+mM)×

M×

k=r×

S, wherein S is the number of segments k=1, 2, 3, . . . S-1 and M>

m.

2. An apparatus as claimed in claim 1 wherein said processor means includes comparator means coupled to said rotating reproduction head for comparing the level of the reproduced video signal with a predetermined level.

3. An apparatus as claimed in claim 1, wherein M is not equal to L when all of said rotating reproduction heads have the same azimuth angle.

4. A video signal recording and reproducing apparatus wherein a video signal of one field period, including a synchronization signal, is recorded on a plurality of tracks on a recording medium in an L-channel/S-segment recording system, L being an integer equal to at least 2, and S being an integer equal to at least 1, comprising:

at least one rotating reproducing head provided for each of the L-channels for reproducing a video signal on said recording medium ,wherein azimuth angles of said rotating reproducing heads are different for each channel;

processor means coupled to said rotating reproduction head for demodulating the video signal reproduced by said rotating reproduction head and detecting the synchronization signal from the video signal, said processor means outputting the demodulated video signal and said synchronization signal;

storing means capable of storing a video signal of at least one field period for storing the video signal output from said processor means;

storage control means for controlling said storing means so that the video signal is written in said storing means in synchronism with the detected synchronization signal when the level of the reproduced video signal exceeds a predetermined level, and so that the video signal is read out in asynchronism with the synchronization signal, and

recording medium travel control means for selecting a traveling speed for said recording medium so that when high speed playback occurs, said recording medium travel control means selects the traveling speed for said recording medium to be (N+1/L) times the recording speed, N being equal to 0, ±

1, ±

2, . . .

5. A video signal recording and reproducing apparatus wherein a video signal of one field period, including a synchronization signal, is recorded on a plurality of tracks on a recording medium in a single-channel/S-segment recording system, S being a positive integer unequal to 1, and wherein guard bands are provided between the tracks on the recording medium comprising:

at least one pair of rotating heads for producing the video signal on said recording medium;

processor means coupled to said rotating reproduction heads for demodulating the video signal reproduced by said rotating reproduction heads, and detecting the synchronization signal from the video signal, said processor means outputting the demodulated video signal and said synchronization signal;

storing mans capable of storing a video signal of at least one field period for storing the video signal output from said processor means;

storage control means or controlling said storing means so that said video signal is written in said storing means in synchronism with the detected synchronization signal when the level of the reproduced signal exceeds a predetermined level, and so that the video signal is read out in asynchronism with the synchronization signal, and

recording medium travel control means for selecting a traveling speed for said recording medium so that when a change in reproduction speed occurs, said recording medium travel control means selects the traveling speed of said recording medium to be M times the recording speed, M being an even integer when said guard bands have a width less than a predetermined width, and to be (N+1/2) as high as the recording speed, N being equal to 0, ±

1, ±

2, . . . when said guard bands have a width greater than said predetermined width.

6. A video signal recording and reproducing apparatus wherein a video signal of one field period, including a synchronization signal, is recorded on a plurality of tracks on a recording medium comprising L-channel/S-segment recording system, L and S being respectively positive integers which are not simultaneously equal to 1, comprising:

at least one rotating reproducing head provided for each of the L-channels for reproducing a video signal on said recording medium, all of said rotating reproduction heads having equal azimuth angles;

processor means coupled to said rotating reproduction head for demodulating the video signal reproduced by said rotating reproduction head and detecting the synchronization signal from the video signal, said processor means outputting the demodulated video signal;

storing means capable of storing a video signal of at least one field period for storing the video signal output from said processor means;

storage control means for controlling said storing means so that the video signal is written in said storing means in synchronism with the detected synchronization signal when the level of the reproduced signal exceeds a predetermined level, and so that the video signal is read out in asynchronism with the synchronization signal, and

recording medium travel control means for selecting a traveling speed for said recording medium so that when high speed playback occurs, said recording medium travel control means selects a traveling speed of the recording medium to be (N+1/2L) times the recording speed, N being equal to 0, ±

1, ±

2, . . .

7. A video signal recording and reproducing apparatus wherein the video signal of one field period is recorded on a plurality of tracks on a recording medium in an L-channel/S-segment recording system, L and S being respectively positive integers which are not simultaneously equal to 1, and wherein signals reproduced from reproduction heads are stored in a field memory, comprising;

ordinary reproduction rotating heads for recording information on said recording medium,

special reproduction rotating heads provided to be used when a change in reproduction speed occurs, the number of said special reproduction rotating heads being equal to the number of said ordinary reproduction rotating heads, said special reproduction heads being arranged to scan positions (n+1/2) times the track pitch apart from the tracks scanned by said ordinary reproduction rotating heads when ordinary reproduction is performed on corresponding channels, n being an integer,

switch means for switching a reproduced signal from said ordinary reproduction heads and a reproduced signal from said special reproduction heads, during changed speed reproduction, at a switching period equal to one-half of the rotation interval of said rotating heads multiplied by an integer; and

field memory controlling means for causing, when a level of either of the switched reproduced signals exceeds a predetermined level after the switching of the reproduced signals by said switch means, the reproduced signal which exceeds the predetermined level to be written in said field memory in synchronism with a synchronization signal obtained from the reproduced signal, and causing signals stored in said field memory to be read out in synchronism with said synchronization signal.

8. A video signal recording and reproducing apparatus wherein a video signal of one field period is recorded on a plurality of tracks on a recording medium in an L-channel/S-segment recording system, L and S being respectively positive integers which are not simultaneously equal to 1, and wherein signals reproduced from the reproduction heads are stored in a field memory, comprising:

ordinary reproduction rotating heads for recording information on said recording medium,

special reproduction rotating heads provided to be used when a change in reproduction speed occurs, the number of said special reproduction rotating heads being equal to the number of said ordinary reproduction rotating heads being arranged to scan positions (n+1/2) times the track pitch apart from the tracks scanned by said ordinary reproduction rotating heads when ordinary reproduction is performed on the corresponding channels, n being an integer, and

switch means for switching a reproduced signal from said ordinary reproduction heads and a reproduced signal from said special reproduction heads, during changed speed reproduction, at a switching period equal to one-half of the rotation interval of said rotating heads multiplied by an integer; and

field memory controlling means for causing, when a level of either of the switched reproduced signals exceeds a predetermined level after the switching of the reproduced signals by said switch means, the reproduced signal which exceeds the predetermined level to be written in said field memory in synchronism with a synchronization signal obtained from the reproduced signal, and causing signals stored in said field memory to be read out in synchronism with said synchronization signal.

9. A video signal recording and reproducing apparatus wherein a video signal of one field period, including a synchronization signal, is recorded on a plurality of tracks on a recording medium in an L-channel/1-segment recording system, L being a positive integer larger than one, comprising:

at least one rotating head provided for each of the L-channels for reproducing a video signal on said recording medium;

processor means coupled to said rotating reproduction head for demodulating the video signal reproduced by said rotating reproduction head and detecting the synchronization signal in the video signal, said processor means outputting the demodulated video signal and synchronization signal;

storing means capable of storing a video signal of at least one field period for storing the video signal output from said processor means;

storage control means for controlling said storing means so that the video signal is written in said storing means in synchronism with the detected synchronization signal when the level of the reproduced video signal exceeds a predetermined level and so that the video signal is read out in asynchronism with the synchronization signal; and

recording medium travel control means for selecting the traveling speed of said recording medium so that in the case of a high speed playback, said recording medium travel control means selects the traveling speed of said recording medium to be (N+m/M) times the recording speed, N being equal to 0, ±

1, ±

2, . . . , and m and M being positive integers having no common divisor except one.