JPS5567287A - Signal receiver - Google Patents
Signal receiverInfo
- Publication number
- JPS5567287A JPS5567287A JP13987578A JP13987578A JPS5567287A JP S5567287 A JPS5567287 A JP S5567287A JP 13987578 A JP13987578 A JP 13987578A JP 13987578 A JP13987578 A JP 13987578A JP S5567287 A JPS5567287 A JP S5567287A
- Authority
- JP
- Japan
- Prior art keywords
- circuits
- duty
- wave
- limiter
- outputs
- 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.)
- Granted
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q1/00—Details of selecting apparatus or arrangements
- H04Q1/18—Electrical details
- H04Q1/30—Signalling arrangements; Manipulation of signalling currents
- H04Q1/44—Signalling arrangements; Manipulation of signalling currents using alternate current
- H04Q1/444—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies
- H04Q1/45—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using multi-frequency signalling
- H04Q1/457—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using multi-frequency signalling with conversion of multifrequency signals into digital signals
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
Abstract
PURPOSE:To prevent the influence dependent upon echo and obtain a square wave of duty 50% by operating AND between a signal obtained by converting an input signal to the aquare wave of duty 50% and a signal obtained by rectifying the output signa of a limiter circuit. CONSTITUTION:Multi-frequency signals applied to input terminal IN are applied to limiter circuits 15 and 15' where a square wave of duty 50% is obtained, after separated into one high-group frequency and one low-group frequency. Meanwhile, the maximum value of one-wave components of the input signal detected by maximum value detection circuits 3 and 3' is inputted to variable threshold circuits 4 and 4', and outputs of variable threshold circuits 4 and 4' are compared with the output of branching filter 1 by limiter circuits 2 and 2', and outputs are applied to rectifier circuits 14 and 14'. AND between outputs of circuits 14 and 14' and limiter circuits 15 and 15' is operated by AND circuits 16 and 16', and square-wave pulses of duty 50% are outputted and applied to band-pass filter circuit 5.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP13987578A JPS5944837B2 (en) | 1978-11-15 | 1978-11-15 | signal receiver |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP13987578A JPS5944837B2 (en) | 1978-11-15 | 1978-11-15 | signal receiver |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5567287A true JPS5567287A (en) | 1980-05-21 |
JPS5944837B2 JPS5944837B2 (en) | 1984-11-01 |
Family
ID=15255591
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP13987578A Expired JPS5944837B2 (en) | 1978-11-15 | 1978-11-15 | signal receiver |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5944837B2 (en) |
-
1978
- 1978-11-15 JP JP13987578A patent/JPS5944837B2/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
JPS5944837B2 (en) | 1984-11-01 |
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