US5214515A — Video signal recording/reproducing apparatus

Claim 1

Independent Claim 285 words

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.

Claim 2

Dependent Claim 285 words

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.

Claim 3

Dependent Claim 33 words

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.

Claim 4

Dependent Claim 26 words

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.

Claim 5

Dependent Claim 259 words

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, . . .

Claim 6

Dependent Claim 259 words

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, . . .

Claim 7

Dependent Claim 283 words

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.

Claim 8

Dependent Claim 283 words

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.

Claim 9

Dependent Claim 245 words

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, . . .

Claim 10

Dependent Claim 245 words

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, . . .

Claim 11

Dependent Claim 261 words

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.

Claim 12

Dependent Claim 261 words

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.

Claim 13

Dependent Claim 260 words

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.

Claim 14

Dependent Claim 260 words

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.

Claim 15

Dependent Claim 250 words

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.

Claim 16

Dependent Claim 250 words

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.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1996-05-24	1996-11-23	1997-05-25	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	2000-05-24	2000-11-23	2001-05-25	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	2004-05-24	2004-11-23	2005-05-25	$7700.00	Window Closed / Lapsed

Video signal recording/reproducing apparatus

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