New! View global litigation for patent families

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
signal
pilot
regenerative
circuit
low
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
JPS6281813A (en) Phase shift circuit
JPS5421823A (en) Reproducer of audio signals
JPH0422232A (en) Orthogonal modulating device
JPS59119521A (en) Data reproducer
JPH03212860A (en) Pll circuit for clock generation
JPS5766517A (en) Pll circuit of pcm processor
JPH01191548A (en) Frequency detection type demodulation circuit
JPH01320827A (en) Control system for notch frequency
JPS6019325A (en) Pull-in detection system of pll circuit
JPS5252616A (en) Synchronous signal generating circuit in data reading device
JPH0451717A (en) Phase locked loop circuit
JPS5990422A (en) Automatic control circuit of pulse phase
JPS5446018A (en) Pcm signal demodulator
GB1495203A (en) Phase locked loop circuits
JPS62128063A (en) Amplitude limiter
JPS61288622A (en) Pll device
JPH0344247A (en) Full digital carrier recovery circuit
JPH0461421A (en) Pll circuit
JPS5380202A (en) Phase-locked loop for demodulation of multichannel record
JPS59111422A (en) Phase locked loop circuit
JPH0383415A (en) Delay circuit device
JPS61214615A (en) Integrated circuit
JPS63116511A (en) High-pass filter
JPH02157675A (en) Testing method for digital integrated circuit
JPS62231923A (en) Scanning speed correcting device in galvanomirror optical system