JPS5471512A - Receiver for multi-frequency signal - Google Patents
Receiver for multi-frequency signalInfo
- Publication number
- JPS5471512A JPS5471512A JP13876777A JP13876777A JPS5471512A JP S5471512 A JPS5471512 A JP S5471512A JP 13876777 A JP13876777 A JP 13876777A JP 13876777 A JP13876777 A JP 13876777A JP S5471512 A JPS5471512 A JP S5471512A
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- circuits
- frequency
- rectangular waveform
- frequency 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
- 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
- H04Q1/453—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using multi-frequency signalling in which m-out-of-n signalling frequencies are transmitted
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
Abstract
PURPOSE:to obtain good characteristics with a simple circuit constitution, by combinating the simple analog circuit with the operation circuit of the program control, in the multi-frequency receiver for telephone delivery system. CONSTITUTION:The low pass filter 203 and high pass filter 204 separating the input multi-frequency signal into the frequency group including only one frequency respectively are provided, and the level detection circuits 206 and 211 detecting the output signal level of the filters 203 and 204 are provided. Further, the comparison circuits 208 and 213 comparing the output signal of the filters 203 and 204 with that of the circuits 206 and 211 and outputting the rectangular waveform, and the operation circuit 215 of program control inputting the rectangular waveform from the circuits 208 and 213 and output circuit 220 are provided. The circuit 215 is connected with the operation clock generation circuit 216 and the read only memory 218, the counter advanced every given time with the program is provided in the circuit 215, and the time length of the predetermined period of rectangular waveform is measured and the intput multi-frequency signal is judged from the result.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP13876777A JPS5471512A (en) | 1977-11-17 | 1977-11-17 | Receiver for multi-frequency signal |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP13876777A JPS5471512A (en) | 1977-11-17 | 1977-11-17 | Receiver for multi-frequency signal |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5471512A true JPS5471512A (en) | 1979-06-08 |
Family
ID=15229708
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP13876777A Pending JPS5471512A (en) | 1977-11-17 | 1977-11-17 | Receiver for multi-frequency signal |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5471512A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5564464A (en) * | 1978-11-10 | 1980-05-15 | Hitachi Ltd | Signal receiver |
JPH02134058A (en) * | 1988-11-15 | 1990-05-23 | Miyakawa Seisakusho:Kk | Frequency detection system |
JPH02198293A (en) * | 1989-01-27 | 1990-08-06 | Hitachi Ltd | Data processor |
-
1977
- 1977-11-17 JP JP13876777A patent/JPS5471512A/en active Pending
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5564464A (en) * | 1978-11-10 | 1980-05-15 | Hitachi Ltd | Signal receiver |
JPS5831140B2 (en) * | 1978-11-10 | 1983-07-04 | 株式会社日立製作所 | signal receiver |
JPH02134058A (en) * | 1988-11-15 | 1990-05-23 | Miyakawa Seisakusho:Kk | Frequency detection system |
JPH02198293A (en) * | 1989-01-27 | 1990-08-06 | Hitachi Ltd | Data processor |
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