US3723637A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Color television system including additional information signals in pulse code on a special color burst
Assignee: Japan Broadcasting Corp
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Filing: 1970-05-21
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Granted: 1973-03-27
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Expires: 1990-05-21
Abstract
Abstract A multiple transmission system of one or more information signals on a color television signal, wherein at least one information signal, such as a voice signal, is sampled and coded to form a coded digital signal representing the information signal. The coded digital signal consists of pulses having a bit frequency and a phase identical with the frequency and the phase of the color burst signal of the color television signal. Successive sample values of said coded digital signal are transmitted during the period of the horizontal blanking signal of the color television signal with the phase of the color burst signal so that the superposed coded digital signal represents also the information of the color burst signal.
Inventors
- 👤 T Fujio
- 👤 T Komoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 14:47
CPC Classifications
H; H04; H04N; H04N11/00; H04N11/06; H04N7/00; H04N7/08; H04N7/084; H04N7/085
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
285 words
A multiple transmission system color television signal comprising information signal on a composite color television signal comprising a baseband luminance component, chrominance components modulated on a chrominance subcarrier, and a horizontal blanking signal containing a horizontal synchronizing signal at a predetermined horizontal scanning frequency and a color reference subcarrier wave in the form of a color burst signal for use in reproducing said chrominance components, said system comprising: sampling means for sampling said information signal with a pulsed sampling signal having a repetition frequency which is an integral multiple of the horizontal scanning frequency of said color television signal to produce a sampled information signal; holding means successively holding sampled information signals for the period of said sampling signal; converting means for converting the sampled signals held in said holding means into a coded digital signal having a repetition frequency and phase substantially equal to the frequency and phase of the color reference subcarrier wave of said color television signal; modifying means for superimposing constant amplitude pulses having the same phase and frequency of said color burst with said coded digital signal to produce a modified coded digital signal containing sufficient information to replace said color bust signal; coupling means connecting the output of said converting means to the input of said modifying means; suppressing means for suppressing said color burst signal from said color television signal; superimposing means for superimposing said modified coded digital signal onto said color television signal in the space of the suppressed color burst signal; and transmitting means for transmitting the signal produced by said superimposing means so that the only information transmitted containing sufficient information to replace said color burst signal is contained within said modified coded digital signal.
Claim 2
Dependent Claim
285 words
A multiple transmission system color television signal comprising information signal on a composite color television signal comprising a baseband luminance component, chrominance components modulated on a chrominance subcarrier, and a horizontal blanking signal containing a horizontal synchronizing signal at a predetermined horizontal scanning frequency and a color reference subcarrier wave in the form of a color burst signal for use in reproducing said chrominance components, said system comprising: sampling means for sampling said information signal with a pulsed sampling signal having a repetition frequency which is an integral multiple of the horizontal scanning frequency of said color television signal to produce a sampled information signal; holding means successively holding sampled information signals for the period of said sampling signal; converting means for converting the sampled signals held in said holding means into a coded digital signal having a repetition frequency and phase substantially equal to the frequency and phase of the color reference subcarrier wave of said color television signal; modifying means for superimposing constant amplitude pulses having the same phase and frequency of said color burst with said coded digital signal to produce a modified coded digital signal containing sufficient information to replace said color bust signal; coupling means connecting the output of said converting means to the input of said modifying means; suppressing means for suppressing said color burst signal from said color television signal; superimposing means for superimposing said modified coded digital signal onto said color television signal in the space of the suppressed color burst signal; and transmitting means for transmitting the signal produced by said superimposing means so that the only information transmitted containing sufficient information to replace said color burst signal is contained within said modified coded digital signal.
Claim 3
Dependent Claim
24 words
A transmission system as defined in claim 1, wherein the repetition frequency of said sampling signal is twice that of said horizontal scanning frequency.
Claim 4
Dependent Claim
60 words
A transmission system as defined in claim 1, wherein said coupling means comprises: register means connected to the output of said converting means for storing said coded digital signal; and readout means connected to said register means for reading out the coded digital signals stored in said register means as a function of the timing of said color burst signal.
Claim 5
Dependent Claim
223 words
A transmission system as defined in claim 1, further comprising: receiving means for receiving said color television signal transmitted by said transmitting means; synchronizing signal separating means connected to said receiving means for separating the synchronizing signal from the received color television signal; gate circuit means having a first input connected to said receiving means and a second input connected to an output of said synchronizing signal separating means for separating said modified coded digital signal from said received color television signal as a function of the timing of said synchronizing signal; generating means connected to the output of said gate circuit means for reproducing said coloR subcarrier wave from said modified coded digital signal; further modifying means coupled to the output of said gate circuit means for converting said modified coded digital signal back to said coded digital signal; storing means connected to said further modifying means for storing said coded digital signal; readout means for reading out the signal stored in said storing means in a sequence corresponding to that of the said information signal; further converting means for converting the readout signals from said readout means into a train of amplitude modulated pulse signals; and reproducing means for reproducing said at least one information signal from said train of amplitude modulated pulse signals, said reproducing means including a low-pass filter.
Claim 6
Dependent Claim
94 words
A transmission system as defined in claim 1 adapted to transmit a second information signal within said modified coded digital signal, further comprising: second sampling means for sampling said second information signal; second holding means for successively holding second sampled information signals; second converting means for converting said second sampled signals held in said second holding means into a second coded digital signal; and combining means for combining said coded digital signal and said second coded digital signal into a composite coded digital signal, said composite signal being thereafter applied to said modifying means.
Claim 7
Dependent Claim
264 words
A transmission system as defined in claim 5, further comprising: receiving means for receiving said color television signal transmitted by said transmitting means; synchronizing signal separating means connected to said receiving means for separating the synchronizing signal from the received color television signal; gate circuit means having a first input connected to said receiving means and a second input connected to an output of said synchronizing signal separating means for separating the composite modified coded digital signal from said received color television signal as a function of the timing of said synchronizing signal; generating means connected to the output of said gate circuit means for reproducing a color subcarrier wave from said composite modified coded digital signal; further modifying means coupled to the output of said gate circuit means for converting said modified composite coded digital signal back to said composite coded digital signal; storing means connected to said further modifying means for storing said composite coded digital signal; readout means for reading out the signal stored in said storing means in a sequence corresponding to that of the sampled information signal; separating means for separating said coded digital signal and said second coded digital signal out of said composite coded digital signal read out of said readout means; first and second further converting means for converting the separated coded digital signals, respectively, into first and second trains of amplitude modulated pulse signals; and first and second reproducing means for reproducing said at least one information signal and said second information signal, respectively, from said first and second trains of amplitude modulated pulse signals.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-03-26 | 1976-09-25 | 1977-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-26 | 1980-09-25 | 1981-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-26 | 1984-09-25 | 1985-03-27 | $7700.00 | Window Closed / Lapsed |