US3824340A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Variable transmission time delay compensation arrangement
Assignee: TDK Micronas GmbH
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Filing: 1972-11-08
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Granted: 1974-07-16
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Expires: 1992-11-08
Abstract
Abstract This arrangement includes a variable delay circuit through which a color television signal is propagated prior to transmission to a communication satellite. The television signal is received from the satellite at the transmitting station. The color subcarrier is extracted from the received television signal and also from the original television signal. Both of the extracted color subcarriers are translated to the same frequency disposed above the frequency of the television signal. The translated subcarrier extracted from the received television signal is propagated through the delay circuit with the original television signal. At the output of the delay circuit this latter subcarrier is extracted and applied to a phase comparator for comparison with the translated subcarrier extracted from the original television signal. A control signal is produced proportional to the phase difference between the two compared translated subcarriers. The control signal controls the delay of the delay circuit to maintain the compared translated subcarriers in a predetermined phase relationship to compensate for variable transmission time delay to the satellite.
Inventors
- 👤 C Sensney
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 05:05
CPC Classifications
H; H04; H04B; H04B7/00; H04B7/005
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
306 words
A variable transmission time delay compensation arrangement for a satellite communication system comprising: a satellite; a source of composite signal including therein a signal component having a given frequency; a variable delay circuit; first means to couple said source to said delay circuit to enable said composite signal to propagate therethrough; second means coupled to the output of said delay circuit to transmit said composite signal to said satellite; third means to receive said composite signal from said satellite; fourth means coupled to said third means to extract a first of said signal component from said received composite signal; fifth means coupled to said source to extract a second of said signal component from said composite signal; sixth means coupled to said fourth means and said fifth means to translate said given frequency of both said first of said signal component and said second of said signal component to a predetermined frequency disposed above said composite signal; seventh means coupled to said sixth means and said first means to enable said first of said signal component having said predEtermined frequency to propagate through said delay circuit along with said composite signal; eighth means coupled to the output of said delay circuit to pass only said first of said signal component having said predetermined frequency; ninth means coupled to the output of said eighth means and said sixth means to compare the phase of said second of said signal component having said predetermined frequency with the phase of said first of said signal component having said predetermined frequency and to produce a control signal proportional to the phase difference between said compared signal components; and 10th means to couple said control signal to said delay circuit to maintain said compared signal components in a predetermined phase relationship to compensate for variable transmission time delay to said satellite.
Claim 2
Dependent Claim
306 words
A variable transmission time delay compensation arrangement for a satellite communication system comprising: a satellite; a source of composite signal including therein a signal component having a given frequency; a variable delay circuit; first means to couple said source to said delay circuit to enable said composite signal to propagate therethrough; second means coupled to the output of said delay circuit to transmit said composite signal to said satellite; third means to receive said composite signal from said satellite; fourth means coupled to said third means to extract a first of said signal component from said received composite signal; fifth means coupled to said source to extract a second of said signal component from said composite signal; sixth means coupled to said fourth means and said fifth means to translate said given frequency of both said first of said signal component and said second of said signal component to a predetermined frequency disposed above said composite signal; seventh means coupled to said sixth means and said first means to enable said first of said signal component having said predEtermined frequency to propagate through said delay circuit along with said composite signal; eighth means coupled to the output of said delay circuit to pass only said first of said signal component having said predetermined frequency; ninth means coupled to the output of said eighth means and said sixth means to compare the phase of said second of said signal component having said predetermined frequency with the phase of said first of said signal component having said predetermined frequency and to produce a control signal proportional to the phase difference between said compared signal components; and 10th means to couple said control signal to said delay circuit to maintain said compared signal components in a predetermined phase relationship to compensate for variable transmission time delay to said satellite.
Claim 3
Dependent Claim
33 words
An arrangement according to claim 1, wherein said first means includes a combiner to combine said composite signal and said first of said signal component having said predetermined frequency on a frequency basis.
Claim 4
Dependent Claim
26 words
An arrangement according to claim 1, wherein said fourth and fifth means each include a filter to pass only said signal component having said given frequency.
Claim 5
Dependent Claim
59 words
An arrangement according to claim 1, wherein said sixth means includes a first mixer coupled to said fourth means, a second mixer coupled to said fifth means, and a local oscillator coupled in common to said first and second mixers, said local oscillator generating an output signal having a frequency equal to said given frequency plus said predetermined frequency.
Claim 6
Dependent Claim
23 words
An arrangement according to claim 1, wherein said seventh means includes a conductor directly coupled between said sixth means and said first means.
Claim 7
Dependent Claim
34 words
An arrangement according to claim 1, wherein said eighth means includes a filter coupled to the output of said delay circuit to pass only said first of said signal component having said predetermined frequency.
Claim 8
Dependent Claim
23 words
An arrangement according to claim 1, wherein said ninth means includes a phase comparator coupled to said sixth means and said eighth means.
Claim 9
Dependent Claim
23 words
An arrangement to claim 1, wherein said 10th means includes a low pass filter coupled between said ninth means and said delay circuit.
Claim 10
Dependent Claim
30 words
An arrangement according to claim 1, wherein said composite signal is a color television signal; and said signal component is a frequency stabilized color subcarrier of said color television signal.
Claim 11
Dependent Claim
309 words
An arrangement according to claim 1, wherein said fourth means includes a first filter having its input coupled to the output of said third means to pass only said first of said signal component having said given frequency; said fifth means includes a second filter having its input coupled to the output of said source to pass only said second of said signal component having said given frequency; said sixth means includes a first mixer having one of its inputs coupled to the output of said first filter, a second mixer having one of its inputs coupled to the output of said second filter, a local oscillator having its output coupled in common to the other input of said first mixer and the other input of said second mixer, said local oscillator generating an output signal having a frequency equal to said given frequency plus said predetermined frequency; said seventh means includes a conductor coupled to the output of said first mixer; said first means includes a combiner having one input coupled to said source, a second input coupled to said conductor and an output coupled to the input of said delay circuit, said combiner combining said composite signal and said first of said signal component having said predetermined frequency on a frequency basis for application to said input of said delay circuit; said eighth means includes a third filter having its input coupled to the output of saId delay circuit to pass only said first of said signal component having said predetermined frequency; said ninth means includes a phase comparator having one input coupled to the output of said second filter and a second input coupled to the output of said third filter; and said 10th means includes a low pass filter coupled between the output of said phase comparator and a control input of said delay circuit.
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) | 1977-07-15 | 1978-01-14 | 1978-07-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-15 | 1982-01-14 | 1982-07-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-15 | 1986-01-14 | 1986-07-16 | $7700.00 | Window Closed / Lapsed |