JPS6424609A - Fm demodulation circuit - Google Patents

Fm demodulation circuit

Info

Publication number
JPS6424609A
JPS6424609A JP62181525A JP18152587A JPS6424609A JP S6424609 A JPS6424609 A JP S6424609A JP 62181525 A JP62181525 A JP 62181525A JP 18152587 A JP18152587 A JP 18152587A JP S6424609 A JPS6424609 A JP S6424609A
Authority
JP
Japan
Prior art keywords
signal
component
side band
demodulation
undesired
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
JP62181525A
Other languages
Japanese (ja)
Inventor
Masahiro Honjo
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.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial 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 Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP62181525A priority Critical patent/JPS6424609A/en
Publication of JPS6424609A publication Critical patent/JPS6424609A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE:To prevent the deterioration in picture quality due to moire by subtracting an arithmetic signal obtained by operating a lower side band component of an FM signal and a carrier frequency component of the FM signal from the FM signal and applying FM demodulation so as to prevent an undesired component from being generated in a demodulation signal. CONSTITUTION:In modulating an FM carrier frequency fc by a signal fs, a 1st low side band f1=fc-fs and a 2nd low side band f2=fc-2fs or the like are generated. The undesired component fm=2fc-2fs after the demodulation is considered to be the demodulation of the 2nd side band component. Then the level of the 2nd side band component is changed just before the demodulator or eliminated. For example, the undesired side band component is operated from the FM signal coming from the terminal 1 by an arithmetic circuit 3 and it is subtracted from the input FM signal by the subtractor 2. The FM signal from which the undesired component is eliminated is demodulated by a demodulator 4 to obtain a demodulation signal without moire, which is outputted to a terminal 27.
JP62181525A 1987-07-21 1987-07-21 Fm demodulation circuit Pending JPS6424609A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP62181525A JPS6424609A (en) 1987-07-21 1987-07-21 Fm demodulation circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP62181525A JPS6424609A (en) 1987-07-21 1987-07-21 Fm demodulation circuit

Publications (1)

Publication Number Publication Date
JPS6424609A true JPS6424609A (en) 1989-01-26

Family

ID=16102288

Family Applications (1)

Application Number Title Priority Date Filing Date
JP62181525A Pending JPS6424609A (en) 1987-07-21 1987-07-21 Fm demodulation circuit

Country Status (1)

Country Link
JP (1) JPS6424609A (en)

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