Method and apparatus for transmitting video signals

Claim 3

The method according to claim 1; in which said additional related signals are color signals.

Claim 4

The method according to claim 1 or 2, in which said luminance signal is frequency-modulated and said chrominance signal is converted to a lower frequency band prior to said transmitting thereof.

Claim 5

The method according to claim 2 or 3; in which said color signals are color difference signals; and further comprising time-compressing said color difference signals to be coextensive with said side portions.

Claim 6

The method according to claim 4; in which said color difference signals are R-Y and B-Y, respectively.

Claim 7

The method according to claim 1; in which said additional related signals are audio signals.

Claim 8

The method according to claim 6, in which said audio sig­nals are time-compressed digital audio signals.

Claim 13

Apparatus for transmitting fields of video signals having a core portion and side portions adjacent to said core portion and comprised of a luminance signal and a chrominance signal, said apparatus comprising: a luminance signal input terminal (1) for receiving the luminance signal; a chrominance signal input terminal (2) for receiving the chrominance signal; frequency modulating means (6); frequency converting means (10) for converting the chro­minance signal to a lower frequency band; decoding means (14) connected to said chrominance signal input terminal (2) for decoding said chrominance signal to color difference signals; time-compressing means (16) for time-compressing said color difference signals; first switching means (4) connected to said luminance sig­nal input terminal (1) and said time-compressing means (16) for selectively supplying said luminance signal and the output of said time-compressing means (16) to said frequency modulat­ing means (6); second switching means (9) for supplying said chrominance signal from sald chrominance signal input terminal (2) to said frequency converting means (10); and adding means (7) for adding the outputs of said frequency modulating means (6) and said frequency converting means (10) so as to provide a transmitted signal therefrom, said first and second switching means (4, 9) being controlled so as to select said luminance signal and said chrominance signal, respectively, during the core portion of each field of said video signals and to select the output of said time-compress­ing means (16) only during the side portions of each field of said video signals.

Claim 14

Apparatus for transmitting fields of video signals having a core portion and side portions adjacent to said core portion and comprised of a luminance signal and a chrominance signal, said apparatus comprising: a luminance signal input terminal (1) for receiving the luminance signal; a chrominance signal input terminal (2) for receiving the chrominance signal; frequency modulating means (6); frequency converting means (10) for converting the chro­minance signal to a lower frequency band; decoding means (14) connected to said chrominance signal input terminal (2) for decoding said chrominance signal to color difference signals; time-compressing means (16) for time-compressing said color difference signals; first switching means (4) connected to said luminance sig­nal input terminal (1) and said time-compressing means (16) for selectively supplying said luminance signal and the output of said time-compressing means (16) to said frequency modulat­ing means (6); second switching means (9) for supplying said chrominance signal from sald chrominance signal input terminal (2) to said frequency converting means (10); and adding means (7) for adding the outputs of said frequency modulating means (6) and said frequency converting means (10) so as to provide a transmitted signal therefrom, said first and second switching means (4, 9) being controlled so as to select said luminance signal and said chrominance signal, respectively, during the core portion of each field of said video signals and to select the output of said time-compress­ing means (16) only during the side portions of each field of said video signals.

Claim 15

Apparatus according to claim 10; further comprising delay means (3, 8) for delaying said luminance signal and said chro­minance signal, said delay means (3, 8) being connected be­tween said luminance signal input terminal (1) and said first switching means (4), and between said chrominance signal input terminal (2) and said second switching means (9).

Claim 16

Apparatus according to claim 10 or 11, further comprising pre-emphasis means (5) connected between said first switching means (4) and said frequency modulating means (6).

Claim 17

Apparatus according to any of claims 10 to 12; further comprising head means (12) connected to an output of said adding means (7) for recording said transmitted signal on a record medium (13).

Claim 18

Apparatus according to claim 13; in which said head means (12) is also operative to reproduce said transmitted signal from said record medium (13); and further comprising low pass filter means (19) connected with an output of said head means (12) for separating the frequency converted chrominance signal from the reproduced transmitted signal; frequency reconverting means (25) for reconverting the separated frequency converted chrominance signal to an origi­nal frequency band; a first chrominance signal output terminal (26) connected with an output of said frequency reconverting means (25); high pass filter means (18) for separating the frequency modulated luminance signal from the reproduced transmitted signal; demodulating means (20) connected with said high pass filter means (18) for demodulating the luminance signal se­parated by the latter from the reproduced transmitted signal; third switching means (17) for selectively supplying said reproduced transmitted signal from said output of the head means (12) to said high pass filter means (18) and directly to said demodulating means (20); a luminance signal output terminal (24); time-expanding means (28, 29); fourth switching means (22) for selectively supplying the output of said demodulating means (20) to said luminance sig­nal output terminal (24) and said time-expanding means (28, 29); said third and fourth switching means (17, 22) being con­trolled so that, during the core portion of each field of the video signals, said third and fourth switching means (17, 22) select said high pass filter means (18) and said luminance signal output terminal (24), respectively, and, during said side portions of each said field, said third and fourth switching means (17, 22) select said demodulating means (20) and said time-expanding means (28, 29); a broad-band chrominance signal output terminal (31); and encoder means (30) connected between said time-expanding means (28, 29) and said broad-band chrominance signal output terminal (31) for encoding time-expanded color difference signals received during said side portions of each field and reconstituting the chrominance signal therefrom.