Video signal and method therefor time axis altering circuit used in a video tape recorder for recording a broadband video signal

Claim 2

A video signal time axis altering circuit for transforming a broad-band video signal including a blanking signal with a period τ into narrow-band video signals in a plurality of channels by dividing said broad-band video signal into signals in a plurality (N; N≧2) of channels on the time axis and expanding the divided signals on the time axis, said circuit comprising: (a) an analog-to-digital converting circuit which receives said broad-band video signal and quantizes said signal into a digital signal; (b) a memory connected to said analog-to-digital converting circuit and having a plurality of storage areas, said memory receiving a quantized video signal from said analog-to-digital converting circuit and storing said quantized video signal in said storage areas by dividing said quantized video signal into a plurality of signals in a predetermined period; (c) a plurality of digital-to-analog converting circuits each of which receives a quantized video signal retrieved from each of said storage areas of said memory and converts said signal into an analog signal; (d) an address control signal generating circuit which is connected to said memory, produces a writing clock signal for controlling the writing of said quantized video signal to said memory and a reading clock signal for controlling the reading of stored video signal out of said memory, and supplies said writing clock signal and reading clock signal to said memory, said writing clock signal having a frequency f 1 determined in such a relation with a frequency f 2 of said reading clock signal of f 1 >N×f 2 ; and (e) a write-halting control circuit which is connected to said address control signal generating circuit and produces a signal which causes said writing clock signal to halt temporarily the writing of said quantized video signal to said memory in said blanking signal period τ.

Claim 3

A video signal time axis altering circuit according to claim 1, wherein said write halting control circuit halts temporarily the writing of said equantized video signal to said memory, in a period τ 1 of a vertical blanking signal.

Claim 4

A video signal time axis altering circuit according to claim 1, wherein said write-halting control circuit halts temporarily the writing of said quantized video signal to said memory in a period τ 2 of a horizontal blanking signal.

Claim 5

A video signal time axis altering circuit according to claim 1, wherein said write-halting control circuit halts temporarily the writing of said quantized video signal to said memory in a period τ 1 of a vertical blanking signal and a period τ 2 of a horizontal blanking signal.

Claim 6

A video signal time axis altering circuit comprising: (a) a memory having a plurality (N; N≧2) of storage areas where digital video signals in a plurality (N) of channels are written in and read out; (b) an address control signal generating circuit which is connected to said memory and produces a writing clock signal for controlling the writing of said digital video signals to said memory and a reading clock signal for controlling the reading of stored video signals from said memory, and supplies said writing clock signal and reading clock signal to said memory; and (c) a read-halting control circuit which is connected to said address control signal generating circuit and produces a signal which causes said reading clock signal to halt temporarily the reading of stored digital video signals from said memory in a period of a blanking signal included in said digital video signals.

Claim 7

A video signal time axis altering circuit comprising: (a) a memory having a plurality (N; N≧2) of storage areas where digital video signals in a plurality (N) of channels are written in and read out; (b) an address control signal generating circuit which is connected to said memory and produces a writing clock signal for controlling the writing of said digital video signals to said memory and a reading clock signal for controlling the reading of stored video signals from said memory, and supplies said writing clock signal and reading clock signal to said memory; and (c) a read-halting control circuit which is connected to said address control signal generating circuit and produces a signal which causes said reading clock signal to halt temporarily the reading of stored digital video signals from said memory in a period of a blanking signal included in said digital video signals.

Claim 8

A video signal time axis altering circuit for transforming a broad-band video signal of a horizontal scanning period T H including a blanking signal with a period τ H into narrow-band video signals in a plurality of channels by dividing said broad-band video signal into signals in a plurality (N; N≧2) of channels on the time axis and expending the divided signals on the time axis, said circuit comprising: (a) analog-to-digital converting means for receiving said broad-band video signal and quantizing said received signal into a digital signal; (b) memory means connected to said analog-to-digital converting means and having a plurality of storage areas, said memory means receiving a quantized video signal from said analog-to-digital converting means and storing said quantized video signal in said storage areas by dividing said quantized video signal into a plurality of signals; (c) digital-to-analog converting means for receiving said quantized video signal retrieved from each of said storage areas of said memory and converting said received quantized signal into an analog signal; and (d) address control signal generating circuit means connected to said memory means for producing a writing clock signal of frequency F 1 for controlling the writing of said quantized signal to said memory means and a reading clock signal of frequency F 0 (F 0 =F 1 /M; M>N) for controlling the reading of said quantized signal out of said memory means to said memory means except for the period τ (τ<τ H ) in the period τ H and for supplying said reading clock signal to said memory means; whereby said narrow-band video signal of a horizontal scanning period T H ', is provided at an output terminal of said memory means.

Claim 9

A video signal time axis altering circuit for transforming a broad-band video signal of a horizontal scanning period T H including a blanking signal with a period τ H into narrow-band video signals in a plurality of channels by dividing said broad-band video signal into signals in a plurality (N; N≧2) of channels on the time axis and expending the divided signals on the time axis, said circuit comprising: (a) analog-to-digital converting means for receiving said broad-band video signal and quantizing said received signal into a digital signal; (b) memory means connected to said analog-to-digital converting means and having a plurality of storage areas, said memory means receiving a quantized video signal from said analog-to-digital converting means and storing said quantized video signal in said storage areas by dividing said quantized video signal into a plurality of signals; (c) digital-to-analog converting means for receiving said quantized video signal retrieved from each of said storage areas of said memory and converting said received quantized signal into an analog signal; and (d) address control signal generating circuit means connected to said memory means for producing a writing clock signal of frequency F 1 for controlling the writing of said quantized signal to said memory means and a reading clock signal of frequency F 0 (F 0 =F 1 /M; M>N) for controlling the reading of said quantized signal out of said memory means to said memory means except for the period τ (τ<τ H ) in the period τ H and for supplying said reading clock signal to said memory means; whereby said narrow-band video signal of a horizontal scanning period T H ', is provided at an output terminal of said memory means.

Claim 10

A video signal time axis altering circuit for transforming a broad-band video signal of a vertical scanning period T V including a vertical blanking signal with a period τ V and a horizontal scanning period T H including a horizontal blanking signal with a period τ H into narrow-band video signals in a plurality of channels by dividing said broad-band video signal into signals in a plurality (N; N≧2) of channels on the time axis and expanding the divided signals on the time axis, said circuit comprising: (a) analog-to-digital converting means for receiving a broad-band luminance signal and chrominance signal and for quantizing said received signals into a digital signals; (b) memory means connected to said analog-to-digital converting means and having a plurality of storage areas, said memory means receiving a quantized luminance signal and chrominance signals from said analog-to-digital converting means and storing said quantized luminance signal in said storage areas by dividing said quantized luminance signal into a plurality of signals, said memory means further including a chrominance signal memory area in which said quantized chrominance signal is stored; (c) digital-to-analog converting means for receiving said quantized luminance signal and chrominance signals retrieved from each of said storage areas of said memory means and converting said received quantized signal into an analog signal; and (d) address control signal generating circuit means connected to said memory means for producing a first writing clock signal of frequency f 1 for controlling the writing of said quantized luminance signal into said memory means and a first reading clock signal of frequency f 0 ( f 0 =f 1 /M; M>N) for controlling the reading of said quantized luminance signals out of said memory means and for supplying said first writing clock signal and first reading clock signal to said memory means, said address control signal generating circuit further generating a second writing clock signal of frequency f 1 ' for controlling the writing of said quantized chrominance signal into said memory means and a second reading clock signal of frequency f 0 ' (f 0 '=f 1 '/M'; M>1) controlling the reading of said quantized chrominance signal out of said memory means, and supplying said second writing clock signal and second reading clock signal to said memory means, whereby a narrow-bank luminance signal of a time axis expansion ratio M and a narrow-band chrominance signal of a time axis expansion ratio M' are provided at output terminals of said memory means.

Claim 11

A video signal time axis altering circuit for transforming a broad-band video signal of a vertical scanning period T V including a vertical blanking signal with a period τ V and a horizontal scanning period T H including a horizontal blanking signal with a period τ H into narrow-band video signals in a plurality of channels by dividing said broad-band video signal into signals in a plurality (N; N≧2) of channels on the time axis and expanding the divided signals on the time axis, said circuit comprising: (a) analog-to-digital converting means for receiving a broad-band luminance signal and chrominance signal and for quantizing said received signals into a digital signals; (b) memory means connected to said analog-to-digital converting means and having a plurality of storage areas, said memory means receiving a quantized luminance signal and chrominance signals from said analog-to-digital converting means and storing said quantized luminance signal in said storage areas by dividing said quantized luminance signal into a plurality of signals, said memory means further including a chrominance signal memory area in which said quantized chrominance signal is stored; (c) digital-to-analog converting means for receiving said quantized luminance signal and chrominance signals retrieved from each of said storage areas of said memory means and converting said received quantized signal into an analog signal; and (d) address control signal generating circuit means connected to said memory means for producing a first writing clock signal of frequency f 1 for controlling the writing of said quantized luminance signal into said memory means and a first reading clock signal of frequency f 0 ( f 0 =f 1 /M; M>N) for controlling the reading of said quantized luminance signals out of said memory means and for supplying said first writing clock signal and first reading clock signal to said memory means, said address control signal generating circuit further generating a second writing clock signal of frequency f 1 ' for controlling the writing of said quantized chrominance signal into said memory means and a second reading clock signal of frequency f 0 ' (f 0 '=f 1 '/M'; M>1) controlling the reading of said quantized chrominance signal out of said memory means, and supplying said second writing clock signal and second reading clock signal to said memory means, whereby a narrow-bank luminance signal of a time axis expansion ratio M and a narrow-band chrominance signal of a time axis expansion ratio M' are provided at output terminals of said memory means.

Claim 12

A magnetic recording apparatus with a time axis altering circuit for transforming a broad-band video signal of a vertical scanning period T V including a vertical blanking signal with a period τ V and a horizontal scanning period T H including a blanking signal a period τ H into narrow-band video signals in a plurality of channels by dividing said broad-band video signal into signals in a plurality (N; N≧2) of channels on the time axis and expending the divided signals on the time axis, said circuit comprising: (a) analog-to-digital converting means for receiving a broad-band luminance signal and chrominance signals and quantizing said received signals into a digital signal; (b) memory means connected to said analog-to-digital converting means and having a plurality of storage areas, said memory means receiving a quantized luminance signal and quantized chrominance signals from said analog-to-digital converting means and storing said quantized luminance signal in said storage areas by dividing said quantized luminance signal into a plurality of signals, said memory means further including a chrominance signal memory area in which said quantized chrominance signal is stored, (c) digital-to-analog converting means for receiving said quantized luminance signal and chrominance signals retrieved from each of said storage areas of said memory and converting said received quantized signal into an analog signal; and (d) address control signal generating circuit means connected to said memory means for producing a first writing of said quantized luminance signal to said memory means and a first reading clock signal of frequency f 0 (f 0 =f 1 /M; M=N) for controlling the reading of said quantized luminance signals out of said memory means and for supplying said first writing clock signal and first reading clock signal to said memory means, said addresses control signal generating circuit further generating a second writing clock signal of frequency f 1 ' for controlling the writing of said quantized chrominance signal into said memory means and a second reading clock signal of frequency f 0 '(f 0 ='f 1 /M; M>1) for controlling the reading of said quantized chrominance signal out of said memory means, and supplying said second writing clock signal and second reading clock signal to said memory means, (e) said memory means generating a narrow-band luminance signal of a time axis-expansion ratio M and a narrow-band chrominance signal of a time axis expansion ratio M; and (f) recording means having a plurality of magnetic recording heads for recording the narrow-band luminance signal and the narrow-band chrominance signal on a magnetic recording medium.

Claim 13

A magnetic recording apparatus with a time axis altering circuit for transforming a broad-band video signal of a vertical scanning period T V including a vertical blanking signal with a period τ V and a horizontal scanning period T H including a blanking signal a period τ H into narrow-band video signals in a plurality of channels by dividing said broad-band video signal into signals in a plurality (N; N≧2) of channels on the time axis and expending the divided signals on the time axis, said circuit comprising: (a) analog-to-digital converting means for receiving a broad-band luminance signal and chrominance signals and quantizing said received signals into a digital signal; (b) memory means connected to said analog-to-digital converting means and having a plurality of storage areas, said memory means receiving a quantized luminance signal and quantized chrominance signals from said analog-to-digital converting means and storing said quantized luminance signal in said storage areas by dividing said quantized luminance signal into a plurality of signals, said memory means further including a chrominance signal memory area in which said quantized chrominance signal is stored, (c) digital-to-analog converting means for receiving said quantized luminance signal and chrominance signals retrieved from each of said storage areas of said memory and converting said received quantized signal into an analog signal; and (d) address control signal generating circuit means connected to said memory means for producing a first writing of said quantized luminance signal to said memory means and a first reading clock signal of frequency f 0 (f 0 =f 1 /M; M=N) for controlling the reading of said quantized luminance signals out of said memory means and for supplying said first writing clock signal and first reading clock signal to said memory means, said addresses control signal generating circuit further generating a second writing clock signal of frequency f 1 ' for controlling the writing of said quantized chrominance signal into said memory means and a second reading clock signal of frequency f 0 '(f 0 ='f 1 /M; M>1) for controlling the reading of said quantized chrominance signal out of said memory means, and supplying said second writing clock signal and second reading clock signal to said memory means, (e) said memory means generating a narrow-band luminance signal of a time axis-expansion ratio M and a narrow-band chrominance signal of a time axis expansion ratio M; and (f) recording means having a plurality of magnetic recording heads for recording the narrow-band luminance signal and the narrow-band chrominance signal on a magnetic recording medium.

Claim 14

A video signal time axis altering circuit for transforming a broad-band video signal of a vertical scanning period T V including a vertical blanking signal with a period τ V and a horizontal scanning period T H including a horizontal blanking signal with a period τ H into narrow-band video signals in a plurality of channels by dividing said broad-band video signal into signals in a plurality (N; N≧2) of channels on the time axis and expanding the divided signals on the time axis, said circuit comprising: (a) analog-to-digital converting means for receiving said broad-band video signal and quantizing said received signal into a digital signal; (b) memory means connected to said analog-to-digital converting means and having a plurality of storage areas, said memory means receiving a quantized video signal from said analog-to-digital converting means and storing said quantized video signal in said storage areas by dividing said quantized video signal into a plurality of signals; (c) digital-to-analog converting means for receiving said quantized video signal retrieved from each of said storage areas of said memory and converting said received quantized signal into an analog signal; and (d) address control signal generating circuit means connected to said memory means for producing a writing clock signal for controlling the writing of said quantized signal to said memory means and a reading clock signal for controlling the reading of said quantized signal out of said memory means, for supplying said writing clock signal and reading clock signal to said memory means except for a period τ 1 (τ 1 <τ V ) in the period τ V and a period τ 2 (τ 2 <τ H ) in the period τ H , and for supplying said reading clock signal to said memory means to said memory means so as to provide said narrow band video signal for a time axis expansion ratio M where M≈N/(1-τ.sub.1 /T.sub.V)×(1-τ.sub.2 /T.sub.H) at an output terminal of said memory means.

Claim 15

A video signal time axis altering circuit for transforming a broad-band video signal of a vertical scanning period T V including a vertical blanking signal with a period τ V and a horizontal scanning period T H including a horizontal blanking signal with a period τ H into narrow-band video signals in a plurality of channels by dividing said broad-band video signal into signals in a plurality (N; N≧2) of channels on the time axis and expanding the divided signals on the time axis, said circuit comprising: (a) analog-to-digital converting means for receiving said broad-band video signal and quantizing said received signal into a digital signal; (b) memory means connected to said analog-to-digital converting means and having a plurality of storage areas, said memory means receiving a quantized video signal from said analog-to-digital converting means and storing said quantized video signal in said storage areas by dividing said quantized video signal into a plurality of signals; (c) digital-to-analog converting means for receiving said quantized video signal retrieved from each of said storage areas of said memory and converting said received quantized signal into an analog signal; and (d) address control signal generating circuit means connected to said memory means for producing a writing clock signal for controlling the writing of said quantized signal to said memory means and a reading clock signal for controlling the reading of said quantized signal out of said memory means, for supplying said writing clock signal and reading clock signal to said memory means except for a period τ 1 (τ 1 <τ V ) in the period τ V and a period τ 2 (τ 2 <τ H ) in the period τ H , and for supplying said reading clock signal to said memory means to said memory means so as to provide said narrow band video signal for a time axis expansion ratio M where M≈N/(1-τ.sub.1 /T.sub.V)×(1-τ.sub.2 /T.sub.H) at an output terminal of said memory means.

Claim 16

A video signal time axis altering circuit for transforming a broad-band video signal of a vertical scanning period T V including a vertical blanking signal with a period τ V and horizontal scanning period T H including a blanking signal into narrow-band video signals in a plurality of channels by dividing said broad-band video signal into signals in a plurality (N; N≧2) of channels on the time axis and expanding the divided signals of the time axis, said circuit comprising: (a) analog-to-digital converting means for receiving a broad-band luminance signal and chrominance signal and for quantizing said received signals into a digital signals; (b) memory means connected to said analog-to digital converting means and having a plurality of storage areas, said memory means receiving a quantized luminance signal and chrominance signals from said analog-to-digital converting means and storing said quantized luminance signal in said storage areas by dividing said quantized luminance signal into a plurality of signals, said memory means further including a chrominance signal memory area in which said quantized chrominance signals are stored; (c) digital-to-analog converting means for receiving said quantized luminance signal and chrominance signals retrieved from each of said storage areas of said memory means and converting said received quantized signal into an analog signal; and (d) address control signal generating circuit means connected to said memory means for producing a writing clock signal for controlling the writing of said quantized signal is to said memory means and a reading clock signal for controlling the reading of said quantized signals out of said memory means and, for supplying said writing clock signal and reading clock signal to said memory means except for a period τ 1 (τ 1 <τ V ) in the period τ V and for supplying said reading clock signal to said memory means so as to provide said narrow-band video signal of a horizontal scanning period T H ' where ##EQU5## at an output terminal of said memory means.

Claim 17

A video signal time axis altering circuit for transforming a broad-band video signal of a vertical scanning period T V including a vertical blanking signal with a period τ V and horizontal scanning period T H including a blanking signal into narrow-band video signals in a plurality of channels by dividing said broad-band video signal into signals in a plurality (N; N≧2) of channels on the time axis and expanding the divided signals of the time axis, said circuit comprising: (a) analog-to-digital converting means for receiving a broad-band luminance signal and chrominance signal and for quantizing said received signals into a digital signals; (b) memory means connected to said analog-to digital converting means and having a plurality of storage areas, said memory means receiving a quantized luminance signal and chrominance signals from said analog-to-digital converting means and storing said quantized luminance signal in said storage areas by dividing said quantized luminance signal into a plurality of signals, said memory means further including a chrominance signal memory area in which said quantized chrominance signals are stored; (c) digital-to-analog converting means for receiving said quantized luminance signal and chrominance signals retrieved from each of said storage areas of said memory means and converting said received quantized signal into an analog signal; and (d) address control signal generating circuit means connected to said memory means for producing a writing clock signal for controlling the writing of said quantized signal is to said memory means and a reading clock signal for controlling the reading of said quantized signals out of said memory means and, for supplying said writing clock signal and reading clock signal to said memory means except for a period τ 1 (τ 1 <τ V ) in the period τ V and for supplying said reading clock signal to said memory means so as to provide said narrow-band video signal of a horizontal scanning period T H ' where ##EQU5## at an output terminal of said memory means.

Claim 22

A magnetic recording apparatus for recording a video signal on a magnetic recording medium in a magnetic recording apparatus by transforming a broad-band video signal of a vertical scanning period T V including a vertical blanking signal with a period τ V and a horizontal scanning period T H including a horizontal blanking signal with a period τ H into narrow-band video signals in a plurality of channels, said apparatus comprising: (a) means for dividing said broad-band video signal into signals of N (N≧2) channels on the time axis; (b) means for removing from the period τ V of each vertical blanking signal of each of the divided video signals a signal of a period τ 1 (τ 1 <τ V ); (c) means for expanding the time axis of the video signal from which the signal of the period τ 1 has been removed, and for forming narrow-band video signals of N channels of a horizontal scanning period T H ', where T.sub.H '≈N×T.sub.H /(1=τ.sub.1 /T.sub.V); and (d) means for recording said narrow-band video signals of N channels on a plurality of magnetic tracks formed on said recording medium by a plurality of magnetic heads.

Claim 23

A magnetic recording apparatus for recording a video signal on a magnetic recording medium in a magnetic recording apparatus by transforming a broad-band video signal of a vertical scanning period T V including a vertical blanking signal with a period τ V and a horizontal scanning period T H including a horizontal blanking signal with a period τ H into narrow-band video signals in a plurality of channels, said apparatus comprising: (a) means for dividing said broad-band video signal into signals of N (N≧2) channels on the time axis; (b) means for removing from the period τ V of each vertical blanking signal of each of the divided video signals a signal of a period τ 1 (τ 1 <τ V ); (c) means for expanding the time axis of the video signal from which the signal of the period τ 1 has been removed, and for forming narrow-band video signals of N channels of a horizontal scanning period T H ', where T.sub.H '≈N×T.sub.H /(1=τ.sub.1 /T.sub.V); and (d) means for recording said narrow-band video signals of N channels on a plurality of magnetic tracks formed on said recording medium by a plurality of magnetic heads.

Claim 24

A magnetic recording apparatus for recording a video signal on a magnetic recording medium in a magnetic recording apparatus by transforming : broad-band video signal of a vertical scanning period T V including a vertical blanking signal with a period τ V and a horizontal scanning period T H including a horizontal blanking signal with a period τ H into narrow-band video signals in a plurality of channels, said apparatus comprising the steps of: (a) means for dividing said broad-band video signal into a signals of N (N≧2) channels on the time axis; (b) means for removing from the period τ V of each vertical blanking signal of each of the divided video signals a signal of a period τ 1 (τ 1 <τ V ); (c) means for removing from the period τ H of each horizontal blanking signal of each of the divided video signals a signal of a period τ 2 (τ 2 <τ H ); (d) means for expanding the time axis of the video signal from which the signals of the periods τ 1 and τ 2 have been removed, and for forming narrow-band video signals of N channels of a time axis expansion ratio M where M≈N/(1-τ.sub.1 /T.sub.V) (1-τ.sub.2 /T.sub.H); and (e) means for recording said narrow-band video signals of N channels on a plurality of magnetic tracks formed on said recording medium by using a plurality of magnetic heads.

Claim 25

A magnetic recording apparatus for recording a video signal on a magnetic recording medium in a magnetic recording apparatus by transforming : broad-band video signal of a vertical scanning period T V including a vertical blanking signal with a period τ V and a horizontal scanning period T H including a horizontal blanking signal with a period τ H into narrow-band video signals in a plurality of channels, said apparatus comprising the steps of: (a) means for dividing said broad-band video signal into a signals of N (N≧2) channels on the time axis; (b) means for removing from the period τ V of each vertical blanking signal of each of the divided video signals a signal of a period τ 1 (τ 1 <τ V ); (c) means for removing from the period τ H of each horizontal blanking signal of each of the divided video signals a signal of a period τ 2 (τ 2 <τ H ); (d) means for expanding the time axis of the video signal from which the signals of the periods τ 1 and τ 2 have been removed, and for forming narrow-band video signals of N channels of a time axis expansion ratio M where M≈N/(1-τ.sub.1 /T.sub.V) (1-τ.sub.2 /T.sub.H); and (e) means for recording said narrow-band video signals of N channels on a plurality of magnetic tracks formed on said recording medium by using a plurality of magnetic heads.

Claim 30

A magnetic recording and playback apparatus for recording and reproducing a video signal on and from a magnetic recording medium in a magnetic recording and playback apparatus by transforming a broad-band video signal of a vertical scanning period T V including a vertical blanking signal with a period τ V and a horizontal scanning period T H including a horizontal blanking signal with a period τ H into narrow-band video signal in a plurality of channels, said apparatus comprising the steps of: (a) means for dividing said broad-band video signal into signals of N (N≧2) channels on the time axis; (b) means for removing from the period τ V of each vertical blanking signal of each of the divided video signals a signal of a period τ 1 (τ 1 <τ V ); (c) means for expanding the time axis of the video signal from which the signal of the period τ 1 has been removed thereby to form narrow-band video signals of N channels of a horizontal scanning period TH where, TH'≈N×T.sub.H /(1-τ.sub.1 /T.sub.V); (d) means for recording said narrow-band video signals of N channels on a plurality of magnetic tracks formed on said recording medium by a plurality of magnetic recording heads; (e) reproducing means for reproducing said narrow-band video signals of N channels recorded on said recording medium by a plurality of playback heads; (f) time axis compressing means for compressing the time axis of the reproduced video signals of N channels, and for adding the signal of the period τ 1 to the vertical blanking signal; and (g) means for connecting serially the compressed video signals of N channels compressed by said time axis compressing means to form said broad-band video signal of a vertical scanning period T V and a horizontal scanning period TH.

Claim 31

A magnetic recording and playback apparatus for recording and reproducing a video signal on and from a magnetic recording medium in a magnetic recording and playback apparatus by transforming a broad-band video signal of a vertical scanning period T V including a vertical blanking signal with a period τ V and a horizontal scanning period T H including a horizontal blanking signal with a period τ H into narrow-band video signal in a plurality of channels, said apparatus comprising the steps of: (a) means for dividing said broad-band video signal into signals of N (N≧2) channels on the time axis; (b) means for removing from the period τ V of each vertical blanking signal of each of the divided video signals a signal of a period τ 1 (τ 1 <τ V ); (c) means for expanding the time axis of the video signal from which the signal of the period τ 1 has been removed thereby to form narrow-band video signals of N channels of a horizontal scanning period TH where, TH'≈N×T.sub.H /(1-τ.sub.1 /T.sub.V); (d) means for recording said narrow-band video signals of N channels on a plurality of magnetic tracks formed on said recording medium by a plurality of magnetic recording heads; (e) reproducing means for reproducing said narrow-band video signals of N channels recorded on said recording medium by a plurality of playback heads; (f) time axis compressing means for compressing the time axis of the reproduced video signals of N channels, and for adding the signal of the period τ 1 to the vertical blanking signal; and (g) means for connecting serially the compressed video signals of N channels compressed by said time axis compressing means to form said broad-band video signal of a vertical scanning period T V and a horizontal scanning period TH.

Claim 32

A magnetic recording and playback apparatus for recording and reproducing a video signal on and from a magnetic recording medium in a magnetic recording apparatus by transforming a broad-band video signal of a vertical scanning period T V including a vertical blanking signal with a period τ V and a horizontal scanning period T H including a horizontal blanking signal with a period τ H into narrow-band video signals in a plurality of channels, said apparatus comprising: (a) means for dividing said broad-band video signal into signals of N (N≧2) channels on the time axis; (b) means for removing from the period τ V of each vertical blanking signal of each of the divided video signals a signal of a period τ 1 (τ 1 <τ V ); (c) means for removing from the period τ H of the horizontal blanking signal a signal of a period τ 2 (τ 2 <τ H ), (d) means for expanding the time axis of the video signal from which the signals of the period τ 1 and τ 2 have been removed thereby to form a narrow-band video signals of N channels of a time axis expansion ratio M wherein M≈N/(1-τ.sub.1 /T.sub.V) (1-τ.sub.2 /T.sub.H); and (e) means for recording said narrow-band video signals of N channels on a plurality of magnetic tracks found on said recording medium by using a plurality of magnetic heads; (f) reproducing means for reproducing said narrow-band video signals of N channels recorded on said recording medium by a plurality of playback heads; (g) time axis compressing means for compressing the time axis of reproduced video signals of N channels, and for adding the signal of the period τ 1 to the vertical blanking signal and adding the signal of the period τ 2 to the horizontal blanking signal; and (h) means for connecting the expanded video signals of N channels serially to form said broad-band video signal of a vertical scanning period T V and a horizontal scanning period T H .

Claim 33

A magnetic recording and playback apparatus for recording and reproducing a video signal on and from a magnetic recording medium in a magnetic recording apparatus by transforming a broad-band video signal of a vertical scanning period T V including a vertical blanking signal with a period τ V and a horizontal scanning period T H including a horizontal blanking signal with a period τ H into narrow-band video signals in a plurality of channels, said apparatus comprising: (a) means for dividing said broad-band video signal into signals of N (N≧2) channels on the time axis; (b) means for removing from the period τ V of each vertical blanking signal of each of the divided video signals a signal of a period τ 1 (τ 1 <τ V ); (c) means for removing from the period τ H of the horizontal blanking signal a signal of a period τ 2 (τ 2 <τ H ), (d) means for expanding the time axis of the video signal from which the signals of the period τ 1 and τ 2 have been removed thereby to form a narrow-band video signals of N channels of a time axis expansion ratio M wherein M≈N/(1-τ.sub.1 /T.sub.V) (1-τ.sub.2 /T.sub.H); and (e) means for recording said narrow-band video signals of N channels on a plurality of magnetic tracks found on said recording medium by using a plurality of magnetic heads; (f) reproducing means for reproducing said narrow-band video signals of N channels recorded on said recording medium by a plurality of playback heads; (g) time axis compressing means for compressing the time axis of reproduced video signals of N channels, and for adding the signal of the period τ 1 to the vertical blanking signal and adding the signal of the period τ 2 to the horizontal blanking signal; and (h) means for connecting the expanded video signals of N channels serially to form said broad-band video signal of a vertical scanning period T V and a horizontal scanning period T H .