Method and apparatus for transmitting video signals during first and second portions thereof

• US 5,223,944 A
• Filed: 11/29/1989
• Issued: 06/29/1993
• Est. Priority Date: 12/08/1988
• Status: Expired due to Fees

• Current Assignee: Sony Corporation (Sony Group Corp.)
• Original Assignee: Sony Corporation (Sony Group Corp.)
• Inventors: Hirai, Jun, Shimada, Satoshi
• Primary Examiner(s): Chin, Tommy P.
• Assistant Examiner(s): TRAN, THAI Q
• Application Number:
  US07/442,620
• Time in Patent Office: 1,308 Days
• Field of Search: 358/310, 358/330, 358/327, 358/325, 358/11, 358/12, 360/19.1, 360/33.1, 360/29, 360/30, 360/35.1
• US Class Current: 386/309
• CPC Class Codes: H04N 9/8211 the additional signal being a sound signal H04N9/835 takes precedence
• CPC Class Codes: H04N 9/832 using an increased bandwidth for the luminance or the chrominance signal

Abstract

In transmitting, for example, by recording and reproducing, fields of video signals each having a core portion and side portions adjacent to such core portion and comprised of luminance and chrominance signals, the luminance signal which is desirably frequency modulated and the chrominance signal which is desirably frequency converted to a lower frequency band are combined and transmitted or recorded during the core portion of each field to provide a display of increased aspect ratio, and the chrominance signal is decoded into color difference signals which are time-compressed and then frequency modulated prior to being transmitted or recorded during the side portions of each field for enhancing the color of the displayed picture.

Claims

1. A method of transmitting fields of a video signal having a first portion corresponding with a first picture area and a second portion corresponding with a second picture area adjacent to said first picture area, said video signal being comprised of a luminance signal and a chrominance signal, said method comprising the steps of:

frequency modulating said luminance signal to provide a frequency modulated luminance signal;

converting said chrominance signal to a lower frequency band to provide a low frequency converted chrominance signal;

transmitting said frequency modulated luminance signal and said low frequency converted chrominance signal during said first portion of said video signal in each of said fields; and

transmitting additional related signals during said second portion of said video signal in each of said fields.

2. The method according to claim 1;

in which said additional related signals include color information of said video signal.

3. The method according to claim 2;

in which said additional related signals include color difference signals; and

further comprising time-compressing said color difference signals to be coextensive with said second portion.

4. The method according to claim 3;

in which said color difference signals are R-Y and B-Y signals, respectively.

5. The method according to claim 1;

in which said additional related signals are audio signals.

6. The method according to claim 5;

in which said audio signals are time-compressed digital audio signals.

7. A method of recording video signals comprised of luminance and chrominance signals and arranged in successive fields each having a first portion corresponding with a first picture area and a second portion corresponding with a second picture area adjacent to said first picture area, said method comprising the steps of:

frequency modulating said luminance signal during said first portion of each of said fields;

frequency converting said chrominance signal to a lower frequency band during said first portion of each of said fields;

adding together the frequency modulated luminance signal and the frequency converted chrominance signal to provide a combined signal;

recording said combined signal during said first portion of each of said fields;

decoding said chrominance signal to color difference signals;

time-compressing said color difference signals;

frequency modulating the time-compressed color difference signals; and

recording the frequency modulated, time-compressed color difference signals during said second portion of each of said fields.

14. A method according to claim 7, wherein the first portion of each successive field of said video signal corresponds with a first area of a picture including a vertical center thereof, each successive field of said video signal including a third portion, said second and third portions corresponding with respective areas of said picture each located adjacent to and respectively above and below said first area, and further comprising the step of recording additional related signals during said third portion of each of said fields.

8. A method of recording and reproducing a video signal comprised of luminance and chrominance signals and arranged in successive fields each having a first portion corresponding with a first picture area and a second portion corresponding with a second picture area adjacent the said first picture area, said method comprising the steps of:

frequency modulating said luminance signal during said first portion of each of said fields, frequency converting said chrominance signal to a lower frequency band during said first portion of each of said fields, adding together the frequency modulated luminance signal and the frequency converted chrominance signal to provide a combined signal, decoding said chrominance signal to color difference signals, time-compressing said color difference signals, frequency modulating the time-compressed color difference signals, and recording said combined signal and the frequency modulated, time-compressed color difference signals during said first portion and second portion, respectively; and

reproducing the recorded combined signal and frequency modulated, time-compressed color difference signals to provide a reproduced signal, separating the frequency modulated luminance signal and the frequency converted chrominance signal from said combined signal in the reproduced signal, demodulating the separated frequency modulated luminance signal, demodulating the frequency modulated time-compressed color difference signals constituting said reproduced signal during the second portion of each field, frequency reconverting the separated frequency converted chrominance signal, time-expanding the demodulated time-compressed color difference signals, and encoding the time-expanded color difference signals to reconstitute the chrominance signal.

15. A method according to claim 8, wherein the first portion of each successive field of said video signal corresponds with a first area of a picture including a vertical center thereof, each successive field of said video signal including a third portion, said second and third portions corresponding with respective areas of said picture each located adjacent to and respectively above and below said first area, and further comprising the steps of recording additional related signals during said third portion of each of said fields and reproducing the additional related signals.

9. Apparatus for transmitting fields of video signals each having a first portion corresponding with a first picture area and a second portion corresponding with a second picture area adjacent to said first picture area, said video signals being comprised of a luminance signal and a chrominance signal, said apparatus comprising:

a luminance signal input terminal for receiving the luminance signal;

a chrominance signal input terminal for receiving the chrominance signal;

frequency modulating means for frequency modulating an input signal received at an input thereof;

frequency converting means for converting the chrominance signal to a lower frequency band;

decoding means coupled with said chrominance signal input terminal for decoding said chrominance signal to color difference signals;

time-compressing means for time-compressing said color difference signals;

first switching means for selectively supplying said luminance signal and the time-compressed color difference signals to the input of said frequency modulating means;

second switching means for supplying said chrominance signal received by said chrominance signal input terminal to said frequency converting means; and

adding means for adding the outputs of said frequency modulating means and said frequency converting means so as to provide a transmitted signal therefrom, said first and second switching means being controlled so as to select said luminance signal and said chrominance signal, respectively, during the first portion of each field of said video signals, said first switching means being controlled to select the time-compressed color difference signals during the second portion of each field of said video signals.

16. The apparatus according to claim 9, wherein the first portion of each successive field of said video signal corresponds with a first area of a picture including a vertical center thereof, each successive field of said video signal including a third portion, said second and third portions corresponding with respective areas of said picture each located adjacent to and respectively above and below said first area, and wherein the first switching means is controlled to select the time-compressed color difference signals during the third portion of each field of said video signals.

10. Apparatus for transmitting fields of video signals having a first portion corresponding with a first picture area and a second portion corresponding with a second picture area adjacent to said first picture area, said video signals being comprised of a luminance signal and a chrominance signal, said apparatus comprising:

a luminance signal input terminal for receiving the luminance signal;

a chrominance signal input terminal for receiving the chrominance signal;

frequency modulating means for frequency modulating an input signal received at an input thereof;

frequency converting means for converting the chrominance signal to a lower frequency band;

decoding means for decoding said chrominance signal to color difference signals;

time-compressing means for time-compressing said color difference signals;

delay means for delaying said luminance signal and said chrominance signal;

first switching means for selectively supplying the delayed luminance signal from said delay means and the time-compressed color difference signals from said time-compressing means to the input of said frequency modulating means;

second switching means for supplying the delayed chrominance signal from the delay means to said frequency converting means; and

adding means for adding the outputs of said frequency modulating means and said frequency converting means so as to provide a transmitted signal therefrom, said first and second switching means being controlled so as to select the delayed luminance and chrominance signals, respectively, during the first portion of each field of said video signals, said first switching means being controlled so as to select the time-compressed color difference signals only during the second portion of each field of said video signals.

11. Apparatus according to claim 10;

further comprising pre-emphasis means for carrying out preemphasis of the luminance signal and time-compressed color difference signals supplied to said frequency modulating means.

12. Apparatus according to claim 11;

further comprising head means coupled with an output of said adding means for recording said transmitted signal on a record medium.

13. Apparatus according to claim 12;

in which said head means is also operative to reproduce said transmitted signal from said record medium; and

further comprising

low pass filter means for separating the frequency converted chrominance signal from the reproduced transmitted signal;

frequency reconverting means for reconverting the separated frequency converted chrominance signal to an original frequency band to produce a first output chrominance signal;

a first chrominance signal output terminal coupled with said frequency reconverting means to provide said first output chrominance signal;

high pass filter means for separating the frequency modulated luminance signal from the reproduced transmitted signal;

demodulating means for selectively demodulating one of the reproduced transmitted signal and the luminance signal separated by the high pass filter means from the reproduced transmitted signal;

a luminance signal output terminal;

time-expanding means for time expanding an input signal received at an input thereof;

third switching means coupled with said demodulating means for selectively supplying the output of said demodulating means to said luminance signal output terminal and to the input of said time-expanding means;

said third switching means being controlled so that, during the first portion of each field of the video signals, said third switching means selects said said luminance signal output terminal and, during said second portion of each said field, said third switching means selects said time-expanding means;

a broad-band chrominance signal output terminal; and

encoder means coupled between said time-expanding means and said broad-band chrominance signal output terminal for encoding time-expanded color difference signals received during said second portion of each field and reconstituting the chrominance signal therefrom, said encoder means being operative to supply the reconstituted chrominance signal to said broadband chrominance signal output terminal.