JPH04348678A - Video detection circuit - Google Patents

Video detection circuit

Info

Publication number
JPH04348678A
JPH04348678A JP12056591A JP12056591A JPH04348678A JP H04348678 A JPH04348678 A JP H04348678A JP 12056591 A JP12056591 A JP 12056591A JP 12056591 A JP12056591 A JP 12056591A JP H04348678 A JPH04348678 A JP H04348678A
Authority
JP
Japan
Prior art keywords
video
intermediate frequency
frequency signal
phase comparator
video intermediate
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.)
Granted
Application number
JP12056591A
Other languages
Japanese (ja)
Other versions
JP2729116B2 (en
Inventor
Yuki Mori
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NEC IC Microcomputer Systems Co Ltd
Original Assignee
NEC IC Microcomputer Systems Co Ltd
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
Application filed by NEC IC Microcomputer Systems Co Ltd filed Critical NEC IC Microcomputer Systems Co Ltd
Priority to JP12056591A priority Critical patent/JP2729116B2/en
Publication of JPH04348678A publication Critical patent/JPH04348678A/en
Application granted granted Critical
Publication of JP2729116B2 publication Critical patent/JP2729116B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Abstract

PURPOSE: To attain circuit integration by implementing video detection without use of a tank circuit 14 comprising an L and a C in the video detection circuit for a TV receiver.
CONSTITUTION: A video intermediate frequency signal from an input terminal 1 is converted into a 2nd video intermediate frequency signal by a frequency converter 2 and inputted to a synchronization detector 3 and a phase comparator 7. Moreover, the video intermediate frequency signal is frequency-divided by a frequency divider 8 to obtain two output signals having a phase difference of 90° and they are fed to the phase comparator 7 and the synchronization detector 3. The output signal of the frequency divider 8 and the 2nd video intermediate frequency signal inputted to the phase comparator 7 are fed to a PLL loop comprising the phase comparator 7, an LPF 6, a VCO 5 and the frequency converter 2, in which the phase difference is always kept to be 90°. Thus, the other output signal and the 2nd video intermediate frequency signal are in phase and the video detection is attained by the synchronization detector.
COPYRIGHT: (C)1992,JPO&Japio
JP12056591A 1991-05-27 1991-05-27 Video detection circuit Expired - Lifetime JP2729116B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP12056591A JP2729116B2 (en) 1991-05-27 1991-05-27 Video detection circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP12056591A JP2729116B2 (en) 1991-05-27 1991-05-27 Video detection circuit

Publications (2)

Publication Number Publication Date
JPH04348678A true JPH04348678A (en) 1992-12-03
JP2729116B2 JP2729116B2 (en) 1998-03-18

Family

ID=14789456

Family Applications (1)

Application Number Title Priority Date Filing Date
JP12056591A Expired - Lifetime JP2729116B2 (en) 1991-05-27 1991-05-27 Video detection circuit

Country Status (1)

Country Link
JP (1) JP2729116B2 (en)

Also Published As

Publication number Publication date
JP2729116B2 (en) 1998-03-18

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Legal Events

Date Code Title Description
A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

Effective date: 19971118