JPS57103465A - Audible signal detecting circuit - Google Patents

Audible signal detecting circuit

Info

Publication number
JPS57103465A
JPS57103465A JP17851380A JP17851380A JPS57103465A JP S57103465 A JPS57103465 A JP S57103465A JP 17851380 A JP17851380 A JP 17851380A JP 17851380 A JP17851380 A JP 17851380A JP S57103465 A JPS57103465 A JP S57103465A
Authority
JP
Japan
Prior art keywords
audible signal
output
gate
memory
stored
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
JP17851380A
Other languages
Japanese (ja)
Inventor
Takao Takeuchi
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 JP17851380A priority Critical patent/JPS57103465A/en
Publication of JPS57103465A publication Critical patent/JPS57103465A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M11/00—Telephonic communication systems specially adapted for combination with other electrical systems
    • H04M11/06—Simultaneous speech and data transmission, e.g. telegraphic transmission over the same conductors

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)

Abstract

PURPOSE:To obtain a simple audible signal detecting circuit with a high detection precision, by using an audible signal generated by the periodical read of a digital code sequence stored in a memory in a time division switchboard. CONSTITUTION:When the code sequence of a normal audible signal is applied to input terminals 21 and 22 of a memory 20, data to be stored is increased by one bit in the memory 20, and information indicating whether the code corresponding to this part appears repeatedly or not is stored, and this information is outputted to an output terminal 38 in corresponding with the receiving digital code. By applying this output and an output obtained by holding this output in a holding circuit 25 for a one-sample time to a gate 34, the output of the gate 34 is set to 1 to count up a counter 35 independently of the decision of the operation result due to a gate 33 if the repeated code exists in an adding circuit 30. Consequently, the detection signal is transmitted to an output terminal 37 certainly when the code sequence of the normal audible signal is received.
JP17851380A 1980-12-17 1980-12-17 Audible signal detecting circuit Pending JPS57103465A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP17851380A JPS57103465A (en) 1980-12-17 1980-12-17 Audible signal detecting circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP17851380A JPS57103465A (en) 1980-12-17 1980-12-17 Audible signal detecting circuit

Publications (1)

Publication Number Publication Date
JPS57103465A true JPS57103465A (en) 1982-06-28

Family

ID=16049780

Family Applications (1)

Application Number Title Priority Date Filing Date
JP17851380A Pending JPS57103465A (en) 1980-12-17 1980-12-17 Audible signal detecting circuit

Country Status (1)

Country Link
JP (1) JPS57103465A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61152156A (en) * 1984-12-21 1986-07-10 インタ−ナショナル　ビジネス　マシ−ンズ　コ−ポレ−ション Call proceeding monitor

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61152156A (en) * 1984-12-21 1986-07-10 インタ−ナショナル　ビジネス　マシ−ンズ　コ−ポレ−ション Call proceeding monitor
JPH0232828B2 (en) * 1984-12-21 1990-07-24 Intaanashonaru Bijinesu Mashiinzu Corp

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