JPH02180481A - Picture reproducing device - Google Patents

Picture reproducing device

Info

Publication number
JPH02180481A
JPH02180481A JP33485188A JP33485188A JPH02180481A JP H02180481 A JPH02180481 A JP H02180481A JP 33485188 A JP33485188 A JP 33485188A JP 33485188 A JP33485188 A JP 33485188A JP H02180481 A JPH02180481 A JP H02180481A
Authority
JP
Grant status
Application
Patent type
Prior art keywords
pilot signal
regenerative
tracks
low
peripheral side
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP33485188A
Inventor
Tokihiko Ogura
Original Assignee
Canon Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date

Links

Abstract

PURPOSE: To attain a stable time base correction concerning all tracks by narrowing the band of a PLL loop, which forms a writing clock pulse from a regenerative pilot signal to a picture memory, to the regenerative pilot signal of low S/N.
CONSTITUTION: The regenerative pilot signal is separated by a BPF 24, which defines 168fH=2.63MHfz as a central frequency, and amplified to a suitable level by an amplifier circuit 26. Then, the regenerative pilot signal goes to a fixed amplitude by an AGC circuit 28. A multiplier circuit 30 multiplies the output of a VCO 32 with the output of the AGC circuit 28 and an LPF 34 takes out a component proportional to the sine of phase difference. The output signal of the LPF 34 is converted to an error voltage by a loop filter 36 and supplied to the VCO 32. A cut-off frequency ωc is set to 1kHz in the outer peripheral side (the 1st-35th tracks) of the satisfactory S/N and set to 500Hz in the inner peripheral side (the 36th-50th tracks) of the low S/N. Thus, the loop band is narrowed only in the inner peripheral side, where the S/N of the regenerative pilot signal is low, and phase error fluctuation caused by the S/N of the pilot signal is suppressed.
COPYRIGHT: (C)1990,JPO&Japio
JP33485188A 1988-12-30 1988-12-30 Picture reproducing device Pending JPH02180481A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP33485188A JPH02180481A (en) 1988-12-30 1988-12-30 Picture reproducing device

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP33485188A JPH02180481A (en) 1988-12-30 1988-12-30 Picture reproducing device
US07450393 US5142376A (en) 1988-12-16 1989-12-14 Image signal recording and reproducing system with pilot signal phase-locked with a synchronizing signal

Publications (1)

Publication Number Publication Date
JPH02180481A true true JPH02180481A (en) 1990-07-13

Family

ID=18281930

Family Applications (1)

Application Number Title Priority Date Filing Date
JP33485188A Pending JPH02180481A (en) 1988-12-30 1988-12-30 Picture reproducing device

Country Status (1)

Country Link
JP (1) JPH02180481A (en)

Similar Documents

Publication Publication Date Title
JPH03140030A (en) Low noise oscillating circuit
JPS6281813A (en) Phase shift circuit
JPS60109313A (en) Semiconductor integrated circuit for intermediate frequency processing
JPS5588459A (en) Signal demodulation circuit
JPS632446A (en) Demodulating circuit for dpsk modulated data
JPS59119521A (en) Data reproducer
JPH023137A (en) Phase synchronous circuit
JPS63178642A (en) Carrier extracting circuit
JPH02218278A (en) Fm modulation circuit
JPS5766517A (en) Pll circuit of pcm processor
JPH01320827A (en) Control system for notch frequency
JPS6019325A (en) Pull-in detection system of pll circuit
US4901027A (en) Signal generator
JPH0451717A (en) Phase locked loop circuit
JPH01256837A (en) Clock extraction circuit
JPS5275917A (en) Phase control circuit
JPS63153933A (en) Synchronous reproducing circuit
JPH0267822A (en) Frequency synthesizer
JPS62128063A (en) Amplitude limiter
JPS61288622A (en) Pll device
JPS6361121A (en) Output correction device for vibration detector
JPS61225905A (en) Output phase variable type phase locked oscillator
JPS5380202A (en) Phase-locked loop for demodulation of multichannel record
JPS59198516A (en) Digital video tape recorder
JPS593709A (en) Sound signal frequency modulator and demodulator