JPH0352825U

JPH0352825U -

Info

Publication number: JPH0352825U
Application number: JP11094189U
Authority: JP
Priority date: 1989-09-25
Filing date: 1989-09-25
Publication date: 1991-05-22

Description

[Brief explanation of drawings]

第１図は、この考案による光学式デイスク再生
装置の時間軸変動分補償回路の一実施例を示す構
成図、第２図は第１図の実施例において同一特性
検波器の利用を可能とする例の構成図、第３図は
従来の光学式デイスク再生装置の時間軸変動分補
償回路を示す構成図である。１……光学式デイスク、２……ピツクアツプ、
３，９……帯域通過フイルタ、４，１０……増幅
器、５，１１……混合器、６，１２，１５……フ
イルタ、７，１３……リミター、８，１４，１９
，２０……検波器、１６……電圧制御発振器、１
７……コントローラ、１８……遅延素子。 Fig. 1 is a block diagram showing an embodiment of the time axis variation compensation circuit of an optical disc playback device according to this invention, and Fig. 2 shows a configuration that allows the use of a detector with the same characteristics as in the embodiment of Fig. 1. An example configuration diagram, FIG. 3 is a configuration diagram showing a time axis variation compensation circuit of a conventional optical disc playback device. 1...Optical disk, 2...Pickup,
3, 9... Band pass filter, 4, 10... Amplifier, 5, 11... Mixer, 6, 12, 15... Filter, 7, 13... Limiter, 8, 14, 19
, 20...Detector, 16...Voltage controlled oscillator, 1
7...Controller, 18...Delay element.

Claims

[Claims for Utility Model Registration] Reference signal generating means for outputting a reference signal indicating time axis fluctuations of an FM analog audio RF signal picked up from an optical disk; and a frequency whose oscillation frequency is controlled by the reference signal. a control means; a mixing means for mixing the FM analog RF audio signal and a signal from the frequency control means; a filter means for extracting a low frequency side component of the output of the mixing means; and a detection means for detecting the output of the filter means. What is claimed is: 1. An optical disc playback device comprising: detection means for outputting an audio signal;