Video exchanging device

Abstract

Abstract PURPOSE:To prevent a beat disturbance from being generated due to mutual modulation between carrier signals on a television picture, by separating a video signal and the carrier signal and allowing them separately to pass through switching circuit. CONSTITUTION:A multiple signal is separated into a video signal SV and carrier signals SA, SD by a low-pass filter 2011 and a high-pass filter 2031, respectively and inputted to first and second switching circuits 202 and 204. Subsequently, the video signal SV obtained from the first switching circuit 202 and the carrier signals SA, SD obtained through a band pass filter 2071 from an output signal of the second switching circuit 204 are synthesized and outputted. By the band pass filter 2071, a spurious signal SSP in a band of the video signal SV generated due to the mutual modulation between the carrier signals in the second switching circuit 204 is eliminated, and no spurious signal SSP is contained in the band of the video signal to be outputted. In such a way, beat disturbance due to the mutual modulation between the carrier signals generated on a television picture can be prevented.

Inventors

• 👤 Yasunari Ikeda
• 👤 Yukinobu Kurata

Bibliographic Details