JPS6432507A - Fm demodulation circuit - Google Patents
Fm demodulation circuitInfo
- Publication number
- JPS6432507A JPS6432507A JP18801487A JP18801487A JPS6432507A JP S6432507 A JPS6432507 A JP S6432507A JP 18801487 A JP18801487 A JP 18801487A JP 18801487 A JP18801487 A JP 18801487A JP S6432507 A JPS6432507 A JP S6432507A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- terminal
- demodulation
- sampling clock
- output
- 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
- Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
Abstract
PURPOSE:To attain stable operation and no adjustment and to improve the demodulation sensitivity by providing an A/D conversion section converting an input FM modulation signal into a digital signal with a prescribed timing, a differentiation means, and a means obtaining a demodulation signal from an output of a low-pass filter. CONSTITUTION:An FM demodulation signal entered from a terminal 10 is given to an A/D converter 11 converting the signal into a digital signal synchronously with the timing of a sampling clock supplied from a terminal 12. An output signal of the converter 11 enters an input terminal of an exclusive OR gate 15 together with a signal retarded by one sampling clock by a delay device 13 receiving also said output signal and the delay device 13 and the gate 15 form a differentiation circuit 16. An output signal Sc of the circuit 16 is given to a low-pass filter 3 and a demodulation signal is outputted from a terminal 19. The pulse width of the signal Sc is proper and requires no adjustment principally by selecting the period of the sampling clock to be 1/4 of that of an FM carrier and the period is also made stable with high accuracy.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP18801487A JPS6432507A (en) | 1987-07-28 | 1987-07-28 | Fm demodulation circuit |
US07/221,117 US4884037A (en) | 1987-07-28 | 1988-07-19 | FM demodulation circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP18801487A JPS6432507A (en) | 1987-07-28 | 1987-07-28 | Fm demodulation circuit |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS6432507A true JPS6432507A (en) | 1989-02-02 |
Family
ID=16216148
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP18801487A Pending JPS6432507A (en) | 1987-07-28 | 1987-07-28 | Fm demodulation circuit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6432507A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5910752A (en) * | 1997-12-09 | 1999-06-08 | Qualcomm Incorporated | Frequency demodulator with resampled output |
-
1987
- 1987-07-28 JP JP18801487A patent/JPS6432507A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5910752A (en) * | 1997-12-09 | 1999-06-08 | Qualcomm Incorporated | Frequency demodulator with resampled output |
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