Patent Document ID: 4093960
Application ID: 05677196
Patent Flag: 1

Claim One:
1. A test signal generating system, comprising: an oscillator; signal producing means having an input and an output, said signal producing means producing a plurality of output signals of predetermined composition at said output, said input being connected with said oscillator whereby said plurality of output signals are derived from a common oscillator source, and said signal producing means including countdown means connected with said single oscillator to facilitate generation of said plurality of output signals with said countdown means including a cascaded chain of countdown modulos so that said signal producing means can derive the line-scanning frequency from said oscillator; and combining means for combining said plurality of output signals to produce a composite output signal, including chroma and line-scanning components that are derived from said common oscillator source and are in phase synchronism with respect to one another, for producing a predetermined test pattern on an image-forming display device connected with said test signal generating means.