JPS6454909A - Fm demodulation circuit - Google Patents
Fm demodulation circuitInfo
- Publication number
- JPS6454909A JPS6454909A JP62212017A JP21201787A JPS6454909A JP S6454909 A JPS6454909 A JP S6454909A JP 62212017 A JP62212017 A JP 62212017A JP 21201787 A JP21201787 A JP 21201787A JP S6454909 A JPS6454909 A JP S6454909A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- circuit
- multiplier
- component
- fed
- 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
Links
Landscapes
- Television Signal Processing For Recording (AREA)
Abstract
PURPOSE:To eliminate the deterioration of picture quality due to moire and set the FM carrier frequency lower by providing a moire component generating circuit comprising a BPF, a multiplier circuit and a multiplier or the like. CONSTITUTION:An FM signal (a) from a terminal 1 is demodulated by a demodulator 2 and a demodulation signal (b) is fed to a generating circuit 5. A 2fC component is filtered by a BPF 6 in the generating circuit 5 and the result is fed to a multiplier 9. Moreover, the fC component is filtered by a BPF 7 from the signal (b), doubled by a doubler circuit 8 and a 2fS component and a signal (c) are fed to the multiplier 9. A 2fC+ or -2fS component being a signal (d) is generated from the multiplier 9. The signal (d) is fed to a subtractor 4 via a phase adjusting circuit 10 and an amplitude adjusting circuit 11. The subtractor 4 subtracts an output circuit 11 being an output of the generating circuit 5 from a demodulation signal b' via a delay circuit 3 to obtain a signal (e), which is outputted to an output terminal 12.
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62212017A JPS6454909A (en) | 1987-08-26 | 1987-08-26 | Fm demodulation circuit |
DE3853107T DE3853107D1 (en) | 1987-07-21 | 1988-07-21 | Frequency demodulation device. |
KR1019880009096A KR900008750B1 (en) | 1987-07-21 | 1988-07-21 | F.m.demodulation circuit |
EP88306724A EP0300801B1 (en) | 1987-07-21 | 1988-07-21 | Frequency demodulation apparatus |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62212017A JPS6454909A (en) | 1987-08-26 | 1987-08-26 | Fm demodulation circuit |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS6454909A true JPS6454909A (en) | 1989-03-02 |
Family
ID=16615498
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP62212017A Pending JPS6454909A (en) | 1987-07-21 | 1987-08-26 | Fm demodulation circuit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6454909A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR100639046B1 (en) * | 1998-03-05 | 2006-10-27 | 닛토덴코 가부시키가이샤 | Cholesteric liquid crystal layer, and optical element, lighting device and liquid crystal display comprising the same |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS53130008A (en) * | 1977-04-20 | 1978-11-13 | Sony Corp | Signal processing circuit |
-
1987
- 1987-08-26 JP JP62212017A patent/JPS6454909A/en active Pending
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS53130008A (en) * | 1977-04-20 | 1978-11-13 | Sony Corp | Signal processing circuit |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR100639046B1 (en) * | 1998-03-05 | 2006-10-27 | 닛토덴코 가부시키가이샤 | Cholesteric liquid crystal layer, and optical element, lighting device and liquid crystal display comprising the same |
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