New Color TV Receiver With Composite SAW IF Filter Separating the Sound and Picture Signals

Numerous researches and developments of Surface Acoustic Wave (SAW) TV IF filter have been performed for cost reduction and improvement of reliability of TV circuit. Under these circumstances we reported in 1978 that we had established the design and the fabrication techniques of the SAW IF filter-low noise amplifier system in massproduction size, and put it into the market. This year we have completed a high performance TV IF circuit for sound multiplexing broadcasting, which consists of a more advanced SAW filter. The signal detections are individually performed by the interearrier signal in IF without any external signal. This paper describes the design techniques of newly developed composite SAW IF filter, which is the key device to realize the new circuit and the sound-picture-color crossbeat interferences to picture and sound quality in color TV sets.