JPS5471512A - Receiver for multi-frequency signal - Google Patents

Receiver for multi-frequency signal

Info

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
Application number
JP13876777A
Other languages
Japanese (ja)
Inventor
Kunihiko Niwa
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NEC Corp
Original Assignee
NEC Corp
Nippon Electric Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by NEC Corp, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP13876777A priority Critical patent/JPS5471512A/en
Publication of JPS5471512A publication Critical patent/JPS5471512A/en
Pending legal-status Critical Current

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

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.
JP13876777A 1977-11-17 1977-11-17 Receiver for multi-frequency signal Pending JPS5471512A (en)

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)

* Cited by examiner, † Cited by third party
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

Cited By (4)

* Cited by examiner, † Cited by third party
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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