US 4,912,549 A · Video signal synchronization system as for an extended definition widescreen television signal processing system

Abstract

Apparatus and method of synchronizing the component signals of a multi-component augmented television signal between its generation reception are disclosed. The disclosed apparatus includes circuitry which generates a training signal that indicates the position of the first pixel in each horizontal line interval of the video signal. This training signal is inserted into one horizontal line interval of the active video signal for transmission. The receiver includes circuitry which separates the training signal and derives a timing signal from it. The timing signal is used to define the pixel positions of various decoded components of the received video signal to facilitate their combination. The timing signal is also used to align the color subcarrier signal and to generate other carrier and subcarrier signals used in the decoding process. Two training signals are disclosed: a pseudo-random noise sequence and a time-reversed, all-pass filtered, raised-cosine 2T pulse.

Claims21

Dependent claims

Apparatus comprising:

a source of television signal having a main signal component including a luminance signal sub-component and a color information signal sub-component, an encoded augmentation signal component, and a training signal component;
signal separating means, coupled to said source, for separating said main signal component, said encoded auxiliary signal component and said training signal component from said video signal;
main signal processing means, coupled to said signal separating means, for separating the luminance signal sub-component and the color information signal sub-component from said main signal component;
means, coupled to said signal separating means, for processing said training signal component to develop a time-reference signal;
decoding means, coupled to said signal separating means and responsive to said time-reference signal for decoding said encoded augmentation signal component to generate a decoded auxiliary signal;
means for combining said decoded auxiliary signal with one of said luminance signal sub-component and said color information signal sub-component to generate video signals representing an enhanced video image.

3 more elements

A system for controlling the relative timing of a plurality of signal components of an augmented video signal, comprising:

a source of augmented video signal including main and auxiliary component signals;
a source of training signal representing a predetermined instant in a horizontal line period of said video signal;
means for combining said augmented video signal and said training signal to generate a transmitted signal;
means, coupled to receive said transmitted signal, for separating the training signal from said transmitted signal;
means for processing said training signal to generate a time-reference signal indicative of said predetermined instant;
means, coupled to receive said transmitted signal, for separating the main and auxiliary component signals therefrom;
means, responsive to said time-reference signal, for aligning said main and auxiliary signals to produce time-aligned main and auxiliary signals;
means for combining said tim-aligned main and auxiliary signals to generate video signals representing an enhanced image.

5 more elements

A method of processing an augmented video signal which includes main and auxiliary video signal components and a training signal component that occurs within one horizontal line interval of said augmented video signal and includes multiple instances of a basic training signal, comprising the steps of:

sampling the training signal component from the augmented video signal at instants determined by a sampling clock signal to generate a sampled data training signal;
accumulating corresponding samples of said multiple instances of said basic training signal to generate an accumulated basic training signal;
correlating said accumulated basic training signal with stored samples representing said basic training signal to generate a time-reference signal;
separating said main and auxiliary video signal components from said augmented video signal;
processing said main and auxiliary video signals in time relative to said time-reference signal to generate time-aligned main and auxiliary video signals;
combining said time-aligned main and auxiliary video signals to generate video signals representing an enhanced image.

3 more elements

Dependencies are inferred from the claim text.

Video signal synchronization system as for an extended definition widescreen television signal processing system

Life of this patent

Video signal synchronization system as for an extended definition widescreen television signal processing system

Life of this patent

Abstract

Claims21