US 4,025,947 AGranted

Video assignment systems

AssigneeMicro Consultants Limited

InventorPeter Colin Michael

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Abstract

An assignment system adapted to accommodate video and audio signals is provided with a digital cross-point switching matrix which is controlled by a control device which enables connections between selected inputs and outputs of said matrix. The input signals are first applied to analog-to-digital converters, from which the signal is converted into serial form before entering the cross-point matrix. The output from the matrix is converted to parallel form and thereafter to an analog signal by digital-to-analog converters. At any one input the color burst information contained on the incoming video signal, is detected and this controls the rate of conversion of the signal into digital form. The horizontal synchronizing pulse information is detected from the incoming signal and is added to the serial data stream in a coded form and after switching of the data is detected and retrieved before reconversion of the data into analogue form.

Claims10

Dependent claims

A video and audio signal assignment system for handling incoming signals having horizontal synchronizing pulse and colour burst information thereon said system comprising:

(a) a plurality of analog-to-digital converters for receiving and converting said incoming signals into digital form,
(b) a plurality of parallel-to-serial converters having their inputs connected to the outputs of the analog-to-digital converters for converting said signals into serial data,
(c) a digital cross-point switching matrix connected to the outputs of said parallel-to-serial converters;
(d) a plurality of serial-to-parallel converters connected to said cross-point matrix for receiving said serial data;
(e) a plurality of digital-to-analog converters connected to said serial-to-parallel converters;
(f) a control device for enabling the connection between selected inputs and outputs of said matrix,
(g) burst detector means for detecting the colour burst information on said incoming video signals,
(h) clocking generator means determining the rate of conversion of said video signal into digital form, said clocking generator conversion rate being controlled by said detected colour burst signal,
(i) sync detector means for detecting the horizontal sync pulse information on the incoming video signal,
(j) switching means in said parallel-to-serial converter for including said detected sync pulse information into said serial data stream in a coded form, and
(k) coded sync detector means for detecting and retrieving the coded sync pulse information received by said serial-to-parallel converter.

8 more elements

Dependencies are inferred from the claim text.