公开(公告)号：DE2728119A1

公开(公告)日：1978-01-12

申请号：DE2728119

申请日：1977-06-22

Applicant: SONY CORP

Inventor： SOMENO NOBORU ,  MURATA NORIO ,  OHAMA SOICHI

IPC: H03J5/02 ,  H03J7/28 ,  H03L7/18 ,  H03L7/185 ,  H04B1/26 ,  H04B1/40 ,  H03J5/00

公开(公告)号：CA1096447A

公开(公告)日：1981-02-24

申请号：CA280614

申请日：1977-06-15

Applicant: SONY CORP

Inventor： SOMENO NOBORU ,  MURATA NORIO ,  OHAMA SOICHI

IPC: H03J5/02 ,  H03J7/28 ,  H03L7/18 ,  H03L7/185 ,  H04B1/26 ,  H04B1/40 ,  H04B1/32

Abstract: A radio receiver having RF, frequency converter, demodulator and audio stages, in which the frequency converter stage is connected to a local oscillator composed of a phase locked loop. The radio receiver includes a variable frequency divider inserted into the phase locked loop, a memory circuit for variably controlling the frequency dividing ratio of the frequency divider in accordance with a signal to be received, a scanning counter for supplying a read-out control signal to the memory circuit, a clock signal source for generating a clock signal, a counter control circuit for controlling supply and supply-terminating of the clock signal fed to the scanning counter, a level detecting circuit for detecting if a signal level, a switching circuit for switching a received channel, and a circuit for cutting off the clock signal fed to the scanning counter when outputs of the switching circuit and level detecting circuit are fed thereto.