JPS6478006A - Fm demodulation circuit - Google Patents
Fm demodulation circuitInfo
- Publication number
- JPS6478006A JPS6478006A JP62235149A JP23514987A JPS6478006A JP S6478006 A JPS6478006 A JP S6478006A JP 62235149 A JP62235149 A JP 62235149A JP 23514987 A JP23514987 A JP 23514987A JP S6478006 A JPS6478006 A JP S6478006A
- Authority
- JP
- Japan
- Prior art keywords
- carrier frequency
- modulation signal
- phase
- sideband wave
- furthermore
- 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 reduce deterioration in picture quality due to a moire component by displacing displacement relation between an FM carrier frequency and an FM sideband wave larger than that in an ordinary state, and applying distortion. CONSTITUTION:The frequency band area of an FM modulation signal with a carrier frequency fc is limited to 2fc by a low-pass filter 3, and the phase of the lower sideband wave of the FM modulation signal is delayed by a prescribed quantity for the carrier frequency fc by a phase displacement circuit 4, and furthermore, the phase of the upper sideband wave of the FM modulation signal is advanced by the prescribed quantity for the FM carrier frequency fc. In such a way, an unrequired component generated in a demodulator 5 is attenuated, and the moire component generated in a demodulation signal can be attenuated remarkably, thereby, the deterioration in the picture quality due to the moire component can be reduced, and furthermore, the FM carrier frequency fc can be set at a level lower than ever.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62235149A JPS6478006A (en) | 1987-09-18 | 1987-09-18 | Fm demodulation circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62235149A JPS6478006A (en) | 1987-09-18 | 1987-09-18 | Fm demodulation circuit |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS6478006A true JPS6478006A (en) | 1989-03-23 |
Family
ID=16981778
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP62235149A Pending JPS6478006A (en) | 1987-09-18 | 1987-09-18 | Fm demodulation circuit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6478006A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5293245A (en) * | 1991-05-15 | 1994-03-08 | Victor Company Of Japan, Ltd. | Video demodulation apparatus with moire component cancellation |
-
1987
- 1987-09-18 JP JP62235149A patent/JPS6478006A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5293245A (en) * | 1991-05-15 | 1994-03-08 | Victor Company Of Japan, Ltd. | Video demodulation apparatus with moire component cancellation |
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