TDM Scheme for digital video processing
AssigneeRCA Corporation
InventorsRobert A. Dischert, James J. Williams, Jr., Glenn A. Reitmeier
Life of this patent
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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.degree. 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.degree. out-of-phase from line-to-line on a given line. The discarded samples of Q and I are 180.degree. 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.
Claims21
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.
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.
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.
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.
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.
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.
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.
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.
Dependencies are inferred from the claim text.