JPS54138423A - Fault detecting circuit of speaker circuit - Google Patents

Fault detecting circuit of speaker circuit

Info

Publication number
JPS54138423A
JPS54138423A JP4518878A JP4518878A JPS54138423A JP S54138423 A JPS54138423 A JP S54138423A JP 4518878 A JP4518878 A JP 4518878A JP 4518878 A JP4518878 A JP 4518878A JP S54138423 A JPS54138423 A JP S54138423A
Authority
JP
Japan
Prior art keywords
speaker
circuit
direct
current signal
signal source
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
JP4518878A
Other languages
Japanese (ja)
Inventor
Yasuhiro Hata
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.)
Oki Electric Industry Co Ltd
Original Assignee
Oki Electric Industry 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 Oki Electric Industry Co Ltd filed Critical Oki Electric Industry Co Ltd
Priority to JP4518878A priority Critical patent/JPS54138423A/en
Publication of JPS54138423A publication Critical patent/JPS54138423A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R29/00—Monitoring arrangements; Testing arrangements

Abstract

PURPOSE:To enable execution of checking of speaker circuit, by connecting a direct- current signal source to the line in a way to enable changeover with speaker amplifier. CONSTITUTION:A direct-current signal for detection of fault sent out from a direct- current signal source 7 flows in a second loop of direct-current signal source 7, 8, line 4, thransformer 3', alternating-current blocking circuit 11, signal generator 10, line 4, switching unit 8, and direct-current signal source 7. When there is a fault in the speaker circuit, the loop is not completed, and direct-current signal is not given to the signal generator 10, so that only the detection signal of the frequency alloted to the speaker 2 is not generated. A detector 6 judges to be nomral when the arriving detection signals are all frequencues allotted to each speaker 2, and, otherwise, judges that the circuit in the speaker 2 to which the frequeny is alloted is defective.
JP4518878A 1978-04-19 1978-04-19 Fault detecting circuit of speaker circuit Pending JPS54138423A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4518878A JPS54138423A (en) 1978-04-19 1978-04-19 Fault detecting circuit of speaker circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4518878A JPS54138423A (en) 1978-04-19 1978-04-19 Fault detecting circuit of speaker circuit

Publications (1)

Publication Number Publication Date
JPS54138423A true JPS54138423A (en) 1979-10-26

Family

ID=12712283

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4518878A Pending JPS54138423A (en) 1978-04-19 1978-04-19 Fault detecting circuit of speaker circuit

Country Status (1)

Country Link
JP (1) JPS54138423A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106998523A (en) * 2017-04-24 2017-08-01 恒业世纪安全技术有限公司 A kind of two line detects the circuit and detection means of the online quantity of loudspeaker in real time

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106998523A (en) * 2017-04-24 2017-08-01 恒业世纪安全技术有限公司 A kind of two line detects the circuit and detection means of the online quantity of loudspeaker in real time

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