Title:
AUTOMATIC REJECTION SIGNAL PRODUCING SYSTEM IN DISC PLAYER
Document Type and Number:
Japanese Patent JPS58128062
Kind Code:
A
Abstract:
PURPOSE:To fabricate an AGC circuit having one stage and to reduce circuit components remarkably, by obtaining an automatic rejection signal directly from a DC voltage used for gain control of an AGC amplifier applying AGC to a tracking control signal. CONSTITUTION:When a picked up RF output signal from adisc is continuously applied to a terminal 13, only the tracking control signal among the RF output signal passes through a low pass filter 14 and is inputted to an AGC circuit C. The tracking signal is applied with AGC at the circuit C and is inputted to a tracking control circuit. If no RF output signal is picked up, the output of a DC voltage amplifier 17 being the gain control of an AGC amplifier 15 is changed extremely. The ouput of the amplifier 17 is delayed at a delay circuit, converted into a pulse waveform at a wave shape circuit 19 and an automatic rejection signal is obtained.
Inventors:
OTOGAWA MITSUHIRO
TAKETOMI TOSHIKATSU
TAKETOMI TOSHIKATSU
Application Number:
JP915782A
Publication Date:
July 30, 1983
Filing Date:
January 23, 1982
Export Citation:
Assignee:
AKAI ELECTRIC
International Classes:
G11B21/12; G11B17/04; (IPC1-7): G11B21/12