JPS56154855A - Signal detecting circuit - Google Patents

Signal detecting circuit

Info

Publication number
JPS56154855A
JPS56154855A JP5918780A JP5918780A JPS56154855A JP S56154855 A JPS56154855 A JP S56154855A JP 5918780 A JP5918780 A JP 5918780A JP 5918780 A JP5918780 A JP 5918780A JP S56154855 A JPS56154855 A JP S56154855A
Authority
JP
Japan
Prior art keywords
counter
detecting circuit
received signal
frequency
binary
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
JP5918780A
Other languages
Japanese (ja)
Inventor
Toshihiko Nishimura
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.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
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 Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP5918780A priority Critical patent/JPS56154855A/en
Publication of JPS56154855A publication Critical patent/JPS56154855A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes

Abstract

PURPOSE:To obtain an LSI-implemented signal detecting circuit which operates stably in an in-use environment without adjustment, by preventing erroneous detection due to the noise and momentary break of a received signal, by providing a circuit which discriminates the frequency of the received signal digitally by binary-coding it. CONSTITUTION:After received signal 1 is amplified 2, its unnecessary noise component is eliminated through BPF7 and the resulting signal is binary-coded by comparator 8 and outputted as received pulses 9. Those pulses 9 are counted by N counter 10 up to N, and main counter 11 counts clock 15 in period N. Further, N detecting circuit 17 outputs -N until the count value of counter 10 reaches N and then outputs N when it reaches N; and respective parts are controlled by N and -N and M counter 12 is also controlled. Then, comparators 19a-19n are operated in every cycle and the reception frequency is discriminated by a preset frequency. Next, (m) counters 13a-13n are driven and during the M-cycle period, correct signals of more than (m) cycles are set in detection storages 14a-14n.
JP5918780A 1980-04-30 1980-04-30 Signal detecting circuit Pending JPS56154855A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5918780A JPS56154855A (en) 1980-04-30 1980-04-30 Signal detecting circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5918780A JPS56154855A (en) 1980-04-30 1980-04-30 Signal detecting circuit

Publications (1)

Publication Number Publication Date
JPS56154855A true JPS56154855A (en) 1981-11-30

Family

ID=13106148

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5918780A Pending JPS56154855A (en) 1980-04-30 1980-04-30 Signal detecting circuit

Country Status (1)

Country Link
JP (1) JPS56154855A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6219842U (en) * 1985-07-22 1987-02-05

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS52133608A (en) * 1976-04-30 1977-11-09 Mitsubishi Electric Corp Frequency discriminating circuit

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS52133608A (en) * 1976-04-30 1977-11-09 Mitsubishi Electric Corp Frequency discriminating circuit

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6219842U (en) * 1985-07-22 1987-02-05

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