JPS5962259A - Sound switching device - Google Patents

Sound switching device

Info

Publication number
JPS5962259A
JPS5962259A JP57173582A JP17358282A JPS5962259A JP S5962259 A JPS5962259 A JP S5962259A JP 57173582 A JP57173582 A JP 57173582A JP 17358282 A JP17358282 A JP 17358282A JP S5962259 A JPS5962259 A JP S5962259A
Authority
JP
Japan
Prior art keywords
dial tone
detecting circuit
tone
circuit
dial
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
JP57173582A
Other languages
Japanese (ja)
Inventor
Masaharu Sato
Original Assignee
Matsushita Electric Ind 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 Matsushita Electric Ind Co Ltd filed Critical Matsushita Electric Ind Co Ltd
Priority to JP57173582A priority Critical patent/JPS5962259A/en
Publication of JPS5962259A publication Critical patent/JPS5962259A/en
Pending legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04MTELEPHONIC COMMUNICATION
    • H04M1/00Substation equipment, e.g. for use by subscribers; Analogous equipment at exchanges
    • H04M1/82Line monitoring circuits for call progress or status discrimination

Abstract

PURPOSE:To prevent the intermission of a dial tone and a call tone from being intermitted and to eliminate the anxiety, by bringing a switching device into the receiving state while a called party responds to the transmission, in the a device switching a transmitting or the receiving state with a variable loss circuit. CONSTITUTION:In closing a telephone line for the transmission, a dial tone (400Hz) is detected at a dial tone detecting circuit 9. When the dialing is performed, the dial tone is lost, the dial tone detecting circuit 9 is turned off, but a dial tone detection circuit 10 is turned on. When a called party is called, a call tone is transmitted from a telephone line and detected at a call tone detection circuit 11. Each detecting output of the dial tone detecting circuit 9, dial detecting circuit 10, call tone detecting circuit 11 and a busy tone detecting circuit 12 is applied to a start control circuit 13, and since a control circuit 8 is operated to bring the state into the receiving state while the called party responds after calling, no anxiety is given to the user.
JP57173582A 1982-10-01 1982-10-01 Sound switching device Pending JPS5962259A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP57173582A JPS5962259A (en) 1982-10-01 1982-10-01 Sound switching device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP57173582A JPS5962259A (en) 1982-10-01 1982-10-01 Sound switching device

Publications (1)

Publication Number Publication Date
JPS5962259A true JPS5962259A (en) 1984-04-09

Family

ID=15963243

Family Applications (1)

Application Number Title Priority Date Filing Date
JP57173582A Pending JPS5962259A (en) 1982-10-01 1982-10-01 Sound switching device

Country Status (1)

Country Link
JP (1) JPS5962259A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01295554A (en) * 1988-02-18 1989-11-29 Nec Corp Hand-free circuit and hand-free control system

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5242009A (en) * 1975-09-30 1977-04-01 Fujitsu Ltd Hand free response control system

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5242009A (en) * 1975-09-30 1977-04-01 Fujitsu Ltd Hand free response control system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01295554A (en) * 1988-02-18 1989-11-29 Nec Corp Hand-free circuit and hand-free control system

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