Demodulating circuit

Abstract

Abstract PURPOSE:To remove a rasping tone at the time of switching by supplying a series of FM signals through a PLL, which traces the change of a modulating wave and does not trace the raid change, to a demodulating circuit. CONSTITUTION:A series of the FM signals, which pass through a switch circuit 1, a buffer amplifier 2, a BPF3 and a limiter amplifier 4, to be successively switched and outputted are processed by a PLL5, which traces the frequency change by the modulating wave and does not trace the rapid change, of loop gain and damping factor. A signal to be locked by the FM signal, which is outputted from the PLL, is inputted to an FM modulator 6. Thus, an output signal, which is smoothly changed even during a switching period between the respective FM signals, is obtained and the rasping tone can be removed.

Inventors

• 👤 Masanobu Shinoda
• 👤 篠田　匡暢

Bibliographic Details