Abstract

A standard audio cassette may be employed to provide various types of binary-coded video information, such as alphanumeric symbols and graphic elements, for display on a standard television receiver and also provide analog audio information as respective first and second components of a single composite signal applied to a suitable adaptor for inter-relating an external standard cassette player with a standard television receiver. The present invention is concerned with various improvements in the cassette recording and the adaptor. These improvements include (1) a cassette recording for simultaneous transmission of both binary-coded video information and analog audio information over a single channel, and improved coupling means in the adaptor which is responsive to such simultaneous binary and audio transmission; (2) improved coupling means in the adaptor for preventing the switching between sequentially transmitted analog audio information and binary-coded video information from being heard as audio clicks; (3) improved means for translating binary-coded alphanumeric video information which compensates for the limited video bandwidth of some standard television receivers, and (4) an improved graphic display capability, in addition to the conventional alphanumeric display capability, of a display provided on a standard television receiver.