JPS5684005A - Fm demodulator - Google Patents
Fm demodulatorInfo
- Publication number
- JPS5684005A JPS5684005A JP16206779A JP16206779A JPS5684005A JP S5684005 A JPS5684005 A JP S5684005A JP 16206779 A JP16206779 A JP 16206779A JP 16206779 A JP16206779 A JP 16206779A JP S5684005 A JPS5684005 A JP S5684005A
- Authority
- JP
- Japan
- Prior art keywords
- phase
- filter
- signal
- supplied
- frequency
- 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
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
- H03J7/00—Automatic frequency control; Automatic scanning over a band of frequencies
- H03J7/02—Automatic frequency control
Landscapes
- Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)
Abstract
PURPOSE:To prevent a tracking filter from having an offset by comparing the phase of an FM signal with that of the output signal of the filter and by using the comparison output as a control signal for the filter. CONSTITUTION:Tracking filter 3 has phase characteristics 3P to frequency characteristics 3F, namely, leading in phase (theta) by 90 deg. at center frequency fc and decreasing in shift in phase (theta) corresponding to the frequency in the passing band of the filter. Further, intermediate frequency signal Si is supplied to phase-comparing circuit 12 and intermediate frequency signal Sj from filter 3 is also supplied to comparing circuit 12 to make a phase comparison, thereby outputting DC signal Sd whose level corresponds to the phase difference between signals Si and Sj. This signal Sd is supplied as control voltage Ea to filter 3 by way of amplifier 13 and adding circuit 11 to constitute phase control loop 10.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP16206779A JPS5684005A (en) | 1979-12-12 | 1979-12-12 | Fm demodulator |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP16206779A JPS5684005A (en) | 1979-12-12 | 1979-12-12 | Fm demodulator |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5684005A true JPS5684005A (en) | 1981-07-09 |
Family
ID=15747456
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP16206779A Pending JPS5684005A (en) | 1979-12-12 | 1979-12-12 | Fm demodulator |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5684005A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1983000974A1 (en) * | 1981-08-31 | 1983-03-17 | Ohta, Tomozo | High-sensitivity fm demodulating system |
EP0086838A1 (en) * | 1981-08-31 | 1983-08-31 | Oki Electric Industry Company, Limited | High-sensitivity fm signal demodulation system |
-
1979
- 1979-12-12 JP JP16206779A patent/JPS5684005A/en active Pending
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1983000974A1 (en) * | 1981-08-31 | 1983-03-17 | Ohta, Tomozo | High-sensitivity fm demodulating system |
EP0086838A1 (en) * | 1981-08-31 | 1983-08-31 | Oki Electric Industry Company, Limited | High-sensitivity fm signal demodulation system |
US4527187A (en) * | 1981-08-31 | 1985-07-02 | Oki Electric Industry Co., Ltd. | High sensitivity FM signal demodulation system |
EP0086838B1 (en) * | 1981-08-31 | 1986-11-20 | Oki Electric Industry Company, Limited | High-sensitivity fm signal demodulation system |
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