JPS56169462A - Demodulation circuit for frequency shift modulation signal - Google Patents
Demodulation circuit for frequency shift modulation signalInfo
- Publication number
- JPS56169462A JPS56169462A JP7394980A JP7394980A JPS56169462A JP S56169462 A JPS56169462 A JP S56169462A JP 7394980 A JP7394980 A JP 7394980A JP 7394980 A JP7394980 A JP 7394980A JP S56169462 A JPS56169462 A JP S56169462A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- circuit
- discrimination
- sequence
- modulation signal
- 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
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/10—Frequency-modulated carrier systems, i.e. using frequency-shift keying
- H04L27/14—Demodulator circuits; Receiver circuits
- H04L27/156—Demodulator circuits; Receiver circuits with demodulation using temporal properties of the received signal, e.g. detecting pulse width
- H04L27/1563—Demodulator circuits; Receiver circuits with demodulation using temporal properties of the received signal, e.g. detecting pulse width using transition or level detection
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
Abstract
PURPOSE:To prevent an erroneous discrimination due to superposition of noise and to increase the reliability of demodulated output, by making the discrimination easy, through the conversion of an input signal to a pulse signal having a large impulse ratio. CONSTITUTION:An FS modulation signal 1a is inputted to a multi-vibrator 2, which detects the zero cross point of the signal 1a, and a generated pulse signal 2a is transmitted to a delay circuit 6 consisting of a sequence circuit 5 and a multivibrator. This delay circuit 6 delays the signal 2a by a given time to transmit a signal 6a to a sequence circuit 7. On the other hand, the signal 2a is supplied to the sequence circuit 5, and the sequence circuits 5, 7 detect the time point of leading and trailing, and they are fed to a set/reset terminal of an FF8 as signals 5a, 7a. Further, the output 8a of this FF8 is fed to a judging circuit 4 as a signal 3a via a low pass filter 3 and the discrimination of either 1 or 0 is made with a specified discrimination level to obtain a demodulated output 4a.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP7394980A JPS56169462A (en) | 1980-05-30 | 1980-05-30 | Demodulation circuit for frequency shift modulation signal |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP7394980A JPS56169462A (en) | 1980-05-30 | 1980-05-30 | Demodulation circuit for frequency shift modulation signal |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS56169462A true JPS56169462A (en) | 1981-12-26 |
Family
ID=13532840
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP7394980A Pending JPS56169462A (en) | 1980-05-30 | 1980-05-30 | Demodulation circuit for frequency shift modulation signal |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS56169462A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS639211A (en) * | 1986-06-28 | 1988-01-14 | Nec Corp | Fm demodulation circuit |
JPH0292003A (en) * | 1988-09-28 | 1990-03-30 | Ando Electric Co Ltd | Circuit for eliminating transient phenomenon in pulse count detector |
-
1980
- 1980-05-30 JP JP7394980A patent/JPS56169462A/en active Pending
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS639211A (en) * | 1986-06-28 | 1988-01-14 | Nec Corp | Fm demodulation circuit |
JPH0292003A (en) * | 1988-09-28 | 1990-03-30 | Ando Electric Co Ltd | Circuit for eliminating transient phenomenon in pulse count detector |
JPH0773166B2 (en) * | 1988-09-28 | 1995-08-02 | 安藤電気株式会社 | Transient elimination circuit for pulse count detector |
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