JPS56156029A - Ssb multidirectional multiplex communication device - Google Patents

Ssb multidirectional multiplex communication device

Info

Publication number
JPS56156029A
JPS56156029A JP6034180A JP6034180A JPS56156029A JP S56156029 A JPS56156029 A JP S56156029A JP 6034180 A JP6034180 A JP 6034180A JP 6034180 A JP6034180 A JP 6034180A JP S56156029 A JPS56156029 A JP S56156029A
Authority
JP
Japan
Prior art keywords
circuit
voice
automatic gain
gain control
output
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
JP6034180A
Other languages
Japanese (ja)
Inventor
Shigeru Fujioka
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 JP6034180A priority Critical patent/JPS56156029A/en
Publication of JPS56156029A publication Critical patent/JPS56156029A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M9/00—Arrangements for interconnection not involving centralised switching
    • H04M9/08—Two-way loud-speaking telephone systems with means for conditioning the signal, e.g. for suppressing echoes for one or both directions of traffic

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)

Abstract

PURPOSE:To eliminate the necessity for transmission of a pilot signal among the slave stations and thus realize an inexpensive communication device, by securing a common use of the same channel among the slave stations and then giving feedback control to an automatic gain control circuit by the output of a mean-value wave detecting circuit for the output of a voice amplifying circuit. CONSTITUTION:A voice amplifying circuit 10 having an automatic gain control circuit is provided, and the mean value of amplitude is detected by a mean-value wave detecting circuit 11 for the output of the circuit 10 to give feedback control to the automatic gain control circuit with the detection output of the circuit 11. In such way, the signal level is equalized by means of a signal obtained by giving a wave detection to a voice signal to eliminate the necessity for transmission of a pilot signal among many slave stations. At the same time, each station is made to use the same channel in common. As a result, a direction-based automatic gain control circuit, a direction-based pilot signal and its detecting circuit plus a synthesizing circuit are disused. Thus a direction-based voice demodulating/amplifying circuit can be formed with a single voice demodulating circuit.
JP6034180A 1980-05-06 1980-05-06 Ssb multidirectional multiplex communication device Pending JPS56156029A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6034180A JPS56156029A (en) 1980-05-06 1980-05-06 Ssb multidirectional multiplex communication device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6034180A JPS56156029A (en) 1980-05-06 1980-05-06 Ssb multidirectional multiplex communication device

Publications (1)

Publication Number Publication Date
JPS56156029A true JPS56156029A (en) 1981-12-02

Family

ID=13139357

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6034180A Pending JPS56156029A (en) 1980-05-06 1980-05-06 Ssb multidirectional multiplex communication device

Country Status (1)

Country Link
JP (1) JPS56156029A (en)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS49112516A (en) * 1973-02-23 1974-10-26
JPS5388510A (en) * 1977-01-14 1978-08-04 Nec Corp Simultaneous call preventing system for radio communication

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS49112516A (en) * 1973-02-23 1974-10-26
JPS5388510A (en) * 1977-01-14 1978-08-04 Nec Corp Simultaneous call preventing system for radio communication

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