JPS57143974A - Transmission system for audio signal - Google Patents

Transmission system for audio signal

Info

Publication number
JPS57143974A
JPS57143974A JP2847081A JP2847081A JPS57143974A JP S57143974 A JPS57143974 A JP S57143974A JP 2847081 A JP2847081 A JP 2847081A JP 2847081 A JP2847081 A JP 2847081A JP S57143974 A JPS57143974 A JP S57143974A
Authority
JP
Japan
Prior art keywords
signal
push
circuit
button
multifrequency
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
JP2847081A
Other languages
Japanese (ja)
Inventor
Isao Shinpo
Akira Kusaba
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.)
Hitachi Ltd
Original Assignee
Hitachi 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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP2847081A priority Critical patent/JPS57143974A/en
Publication of JPS57143974A publication Critical patent/JPS57143974A/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
    • H04M11/066—Telephone sets adapted for data transmision

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Use Of Switch Circuits For Exchanges And Methods Of Control Of Multiplex Exchanges (AREA)

Abstract

PURPOSE:To obtain the same effect as the operation of the push-button switches of a push-button telephone set, by sending an audio signal which corresponds to a code signal from an exchange side when the code signal is received from a terminal equipment. CONSTITUTION:When a subscriber operates push-button switches, corresponding code signals are sent to a signal analyzing circuit 13 through a signal channel 3 and separating circuit 8. While the circuit 13 receives the push-button signals, a state recording circuit 12 is placed in a multifrequency signal transmission state. Then, a signal line 17 is held at a 0, and a signal line 18 is held at a ''1''. Therefore, a gate 9 is closed and gates 10 and 11 are opened, so the code signals which correspond to the push-button switches are supplied to a multifrequency signal generating circuit 14 to generate a multifrequency signal, which is encoded by an encoder 15 into a digital signal; and the digital signal is mixed with a voice signal from the gate 10 by a mixer 16, whose output is sent to a voice channel as it is.
JP2847081A 1981-03-02 1981-03-02 Transmission system for audio signal Pending JPS57143974A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2847081A JPS57143974A (en) 1981-03-02 1981-03-02 Transmission system for audio signal

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2847081A JPS57143974A (en) 1981-03-02 1981-03-02 Transmission system for audio signal

Publications (1)

Publication Number Publication Date
JPS57143974A true JPS57143974A (en) 1982-09-06

Family

ID=12249530

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2847081A Pending JPS57143974A (en) 1981-03-02 1981-03-02 Transmission system for audio signal

Country Status (1)

Country Link
JP (1) JPS57143974A (en)

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