US4376948A
Expired / Lapsed
US
⏱️ 0.0 years remaining
TDM Scheme for digital video processing
Assignee: RCA Corp
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Filing: 1981-01-26
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Granted: 1983-03-15
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Expires: 2001-01-26
Abstract
Abstract A TDM scheme has a Y signal that is sampled at 14.32 MHz and every other sample is discarded. The discarded samples are 180° out-of-phase from line-to-line. I and Q signals are sampled at one half this frequency and every other sample is discarded also 180° out-of-phase from line-to-line on a given line. The discarded samples of Q and I are 180° out-of-phase with respect to each other. This allows insertion of the retained I and Q samples into the retained Y samples to allow multiplexing.
Inventors
- 👤 Robert A. Dischert
- 👤 James J. Williams, Jr.
- 👤 Glenn A. Reitmeier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 16:04
CPC Classifications
H; H04; H04N; H04N11/00; H04N11/04; H04N11/042
Claims Analysis
Total Claims: 29
Claim 1
Independent Claim
99 words
A method for time multiplexing three component signals representing a television picture, said method comprising sampling said component signals with a frequency ratio of 2:1:1 respectively, each component signal having a phase shifted sampling clock from line to line, the lower sampling frequency component signals having a mutual phase shift of the sampling clock on corresponding lines, time delaying the samples of the lower sampling frequency component signals on alternate lines, and applying the delayed and undelayed samples of the lower sampling frequency component signals and the samples of the higher sampling frequency component signal to a single channel.
Claim 2
Independent Claim
99 words
A method for time multiplexing three component signals representing a television picture, said method comprising sampling said component signals with a frequency ratio of 2:1:1 respectively, each component signal having a phase shifted sampling clock from line to line, the lower sampling frequency component signals having a mutual phase shift of the sampling clock on corresponding lines, time delaying the samples of the lower sampling frequency component signals on alternate lines, and applying the delayed and undelayed samples of the lower sampling frequency component signals and the samples of the higher sampling frequency component signal to a single channel.
Claim 3
Dependent Claim
13 words
A method as claimed in claim 1, wherein said samples comprise digital signals.
Claim 4
Dependent Claim
14 words
A method as claimed in claim 1, wherein said phase shifts are 180 degrees.
Claim 5
Dependent Claim
23 words
A method as claimed in claim 1, wherein said time delay comprises one quarter of the sampling period of the lower sampling frequency.
Claim 6
Independent Claim
103 words
An apparatus for time multiplexing three component signals representing a television picture, said apparatus comprising means for sampling said component signals with a frequency ratio of 2:1:1 respectively, each component signal having a mutual phase shifted sample from line to line, the lower sampling frequency component signals having a phase shift of the samples on corresponding lines, means for time delaying the samples of the lower sampling frequency component signals on alternate lines, and means for applying the delayed and undelayed samples of the lower sampling frequency component signals and the samples of the higher sampling frequency component signal to a single channel.
Claim 7
Independent Claim
103 words
An apparatus for time multiplexing three component signals representing a television picture, said apparatus comprising means for sampling said component signals with a frequency ratio of 2:1:1 respectively, each component signal having a mutual phase shifted sample from line to line, the lower sampling frequency component signals having a phase shift of the samples on corresponding lines, means for time delaying the samples of the lower sampling frequency component signals on alternate lines, and means for applying the delayed and undelayed samples of the lower sampling frequency component signals and the samples of the higher sampling frequency component signal to a single channel.
Claim 8
Dependent Claim
13 words
An apparatus as claimed in claim 5, wherein said samples comprise digital signals.
Claim 9
Dependent Claim
14 words
An apparatus as claimed in claim 5, wherein said phase shifts are 180 degrees.
Claim 10
Dependent Claim
23 words
An apparatus as claimed in claim 5, wherein said time delay comprises one quarter of the sampling period of the lower sampling frequency.
Claim 11
Dependent Claim
38 words
An apparatus as claimed in claim 5, wherein said sampling means comprises three analog-to digital converters for said components respectively, three latches coupled to said converters respectively, and a clock generator coupled to said converters and said latches.
Claim 12
Dependent Claim
31 words
An apparatus as claimed in claim 5, wherein said time delaying means comprises a pair of latches coupled to said sampling means for receiving said lower sampling frequency component signals respectively.
Claim 13
Dependent Claim
179 words
An apparatus as claimed in claim 5, wherein said applying means comprises first, second, third, and fourth AND gates, first inputs of said first and fourth gates having a half line frequency applied thereto, first inputs of said second and third gates having a phase inverted half line frequency applied thereto, and second inputs of said first and second gates having undelayed and delay samples of one of said lower sampling frequency component signals applied thereto respectively, second inputs of said third and fourth gates having delayed and undelayed samples of the remaining lower sampling frequency component signal applied thereto, a first OR gate having inputs coupled to the outputs of said first and second AND gates respectively, and second OR gate having inputs coupled to the outputs of said third and fourth AND gates respectively and a third OR gate having first and second inputs coupled to the outputs of said first and second OR gates respectively, a third input coupled to receive samples of the higher sampling frequency component signal, and an output comprising said single channel.
Claim 14
Independent Claim
114 words
A method for demultiplexing three time multiplexed component signals representing a television picture, said component signals being sampled with a frequency ratio of 2:1:1 respectively, each component signal having a mutual phase shifted sampling clock from line to line, the lower sampling frequency component signals having a phase shift of the sampling clock on corresponding lines, samples of the lower sampling frequency component signals being time delayed on alternate lines, the delayed and undelayed samples of the lower sampling frequency component signals and the samples of the higher sampling frequency component signal being applied to a single channel, said method comprising storing said applied samples, and time delaying all of the undelayed stored samples.
Claim 15
Independent Claim
114 words
A method for demultiplexing three time multiplexed component signals representing a television picture, said component signals being sampled with a frequency ratio of 2:1:1 respectively, each component signal having a mutual phase shifted sampling clock from line to line, the lower sampling frequency component signals having a phase shift of the sampling clock on corresponding lines, samples of the lower sampling frequency component signals being time delayed on alternate lines, the delayed and undelayed samples of the lower sampling frequency component signals and the samples of the higher sampling frequency component signal being applied to a single channel, said method comprising storing said applied samples, and time delaying all of the undelayed stored samples.
Claim 16
Dependent Claim
13 words
A method as claimed in claim 12, wherein said samples comprise digital signals.
Claim 17
Dependent Claim
14 words
A method as claimed in claim 13, further comprising digital-to-analog converting said delayed samples.
Claim 18
Independent Claim
118 words
An apparatus for demultiplexing three time multiplexed component signals representing a television picture, said component signals being sampled with a frequency ratio of 2:1:1 respectively, each component signal having a mutual phase shifted sampling clock from line to line, the lower sampling frequency component signals having a phase shift of the sampling clock on corresponding lines, samples of the lower sampling frequency component signals being time delayed on alternate lines, the delayed and undelayed samples of the lower sampling frequency component signals and the samples of the higher sampling frequency component signal being applied to a single channel, said apparatus comprising means for storing said applied samples and means for time delaying all of the undelayed stored samples.
Claim 19
Independent Claim
118 words
An apparatus for demultiplexing three time multiplexed component signals representing a television picture, said component signals being sampled with a frequency ratio of 2:1:1 respectively, each component signal having a mutual phase shifted sampling clock from line to line, the lower sampling frequency component signals having a phase shift of the sampling clock on corresponding lines, samples of the lower sampling frequency component signals being time delayed on alternate lines, the delayed and undelayed samples of the lower sampling frequency component signals and the samples of the higher sampling frequency component signal being applied to a single channel, said apparatus comprising means for storing said applied samples and means for time delaying all of the undelayed stored samples.
Claim 20
Dependent Claim
13 words
An appartus as claimed in claim 15, wherein said samples comprise digital signals.
Claim 21
Dependent Claim
16 words
An apparatus as claimed in claim 16, further comprising means for digital-to-analog converting said stored samples.
Claim 22
Independent Claim
110 words
A method for time multiplexing three component signals representing a television picture, said method comprising generating sampling clock signals for each of said component signals with a frequency ratio of 2:1:1 respectively, each of said sampling clock signals having a phase shift from line to line, the lower frequency sampling clock signals having a mutual phase shift on corresponding lines, sampling said component signals with said clock signals, time delaying the samples of the lower sampling frequency component signals on alternate lines, and applying the delayed and undelayed samples of the lower sampling frequency component signals and the samples of the higher sampling frequency component signal to a single channel.
Claim 23
Independent Claim
110 words
A method for time multiplexing three component signals representing a television picture, said method comprising generating sampling clock signals for each of said component signals with a frequency ratio of 2:1:1 respectively, each of said sampling clock signals having a phase shift from line to line, the lower frequency sampling clock signals having a mutual phase shift on corresponding lines, sampling said component signals with said clock signals, time delaying the samples of the lower sampling frequency component signals on alternate lines, and applying the delayed and undelayed samples of the lower sampling frequency component signals and the samples of the higher sampling frequency component signal to a single channel.
Claim 24
Independent Claim
118 words
An apparatus for time multiplexing three component signals representing a television picture, said apparatus comprising means for generating sampling clock signals for each of said component signals with a frequency ratio of 2:1:1 respectively, each of said sampling clock signals having a phase shift from line to line, the lower frequency sampling clock signals having a mutual phase shift on corresponding lines, means for sampling said component signals with said clock signals, means for time delaying the samples of the lower sampling frequency component signals on alternate lines, and means for applying the delayed and undelayed samples of the lower sampling frequency component signals and the samples of the higher sampling frequency component signal to a single channel.
Claim 25
Independent Claim
118 words
An apparatus for time multiplexing three component signals representing a television picture, said apparatus comprising means for generating sampling clock signals for each of said component signals with a frequency ratio of 2:1:1 respectively, each of said sampling clock signals having a phase shift from line to line, the lower frequency sampling clock signals having a mutual phase shift on corresponding lines, means for sampling said component signals with said clock signals, means for time delaying the samples of the lower sampling frequency component signals on alternate lines, and means for applying the delayed and undelayed samples of the lower sampling frequency component signals and the samples of the higher sampling frequency component signal to a single channel.
Claim 26
Independent Claim
55 words
A method for time multiplexing a plurality of component signals representing a television picture, said method comprising sampling said component signals wherein certain samples are in time coincidence, time delaying selected ones of said coincidence samples so that no time coincidences between samples remain, and applying the delayed and undelayed samples to a single channel.
Claim 27
Independent Claim
55 words
A method for time multiplexing a plurality of component signals representing a television picture, said method comprising sampling said component signals wherein certain samples are in time coincidence, time delaying selected ones of said coincidence samples so that no time coincidences between samples remain, and applying the delayed and undelayed samples to a single channel.
Claim 28
Independent Claim
61 words
An apparatus for time multiplexing a plurality of component signals representing a television picture, said apparatus comprising means for sampling said component signals wherein certain samples are in time coincidence, means for time delaying selected ones of said coincidence samples so that no time coincidences between samples remain, and means for applying the delayed and undelayed samples to a single channel.
Claim 29
Independent Claim
61 words
An apparatus for time multiplexing a plurality of component signals representing a television picture, said apparatus comprising means for sampling said component signals wherein certain samples are in time coincidence, means for time delaying selected ones of said coincidence samples so that no time coincidences between samples remain, and means for applying the delayed and undelayed samples to a single channel.
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) | 1986-03-14 | 1986-09-13 | 1987-03-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-03-14 | 1990-09-13 | 1991-03-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-03-14 | 1994-09-13 | 1995-03-15 | $7700.00 | Window Closed / Lapsed |