JPS5721135A - Voice signal compressing transmission system - Google Patents

Voice signal compressing transmission system

Info

Publication number
JPS5721135A
JPS5721135A JP9596780A JP9596780A JPS5721135A JP S5721135 A JPS5721135 A JP S5721135A JP 9596780 A JP9596780 A JP 9596780A JP 9596780 A JP9596780 A JP 9596780A JP S5721135 A JPS5721135 A JP S5721135A
Authority
JP
Japan
Prior art keywords
signal
circuit
voice signal
time
memory
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
JP9596780A
Other languages
Japanese (ja)
Inventor
Shigeo Nakajima
Shunichiro Egami
Masato Mori
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.)
NTT Inc
Original Assignee
Nippon Telegraph and Telephone 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 Nippon Telegraph and Telephone Corp filed Critical Nippon Telegraph and Telephone Corp
Priority to JP9596780A priority Critical patent/JPS5721135A/en
Publication of JPS5721135A publication Critical patent/JPS5721135A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B14/00—Transmission systems not characterised by the medium used for transmission
    • H04B14/02—Transmission systems not characterised by the medium used for transmission characterised by the use of pulse modulation
    • H04B14/04—Transmission systems not characterised by the medium used for transmission characterised by the use of pulse modulation using pulse code modulation
    • H04B14/046—Systems or methods for reducing noise or bandwidth

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Transmission Systems Not Characterized By The Medium Used For Transmission (AREA)
  • Reduction Or Emphasis Of Bandwidth Of Signals (AREA)

Abstract

PURPOSE:To reduce the band width of occupied frequency, by transmitting the time of no signal period being interruption of a voice signal through compression. CONSTITUTION:An analog voice signal is converted into a digital signal at an encoiding circuit 13 and inputted to a voice signal presence detecting circuit 14. The detection circuit 14 detects the presence of voice signal at every fixed time and outputs a control signal of ''1'' to terminals 15, 16 with the absence of signal. A switch 21 is controlled with the control signal at the terminal 16 to switch it from the output side of the encoding circuit 13 to the fixed pattern generating circuit 22, and this is connected to the data input side of a memory circuit 19. A signal stored in the memory circuit 19 is read out with a clock from a readout clock generating circuit 23 and outputted to an output terminal 24. In case of interrupted auido, the time of no signal period is compressed and stored in the memory 19, thus the clock frequency can be made smaller by the share.
JP9596780A 1980-07-14 1980-07-14 Voice signal compressing transmission system Pending JPS5721135A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9596780A JPS5721135A (en) 1980-07-14 1980-07-14 Voice signal compressing transmission system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9596780A JPS5721135A (en) 1980-07-14 1980-07-14 Voice signal compressing transmission system

Publications (1)

Publication Number Publication Date
JPS5721135A true JPS5721135A (en) 1982-02-03

Family

ID=14151961

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9596780A Pending JPS5721135A (en) 1980-07-14 1980-07-14 Voice signal compressing transmission system

Country Status (1)

Country Link
JP (1) JPS5721135A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3313119A1 (en) * 1983-04-12 1984-10-18 Siemens AG, 1000 Berlin und 8000 München Method for digital sound transmission

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3313119A1 (en) * 1983-04-12 1984-10-18 Siemens AG, 1000 Berlin und 8000 München Method for digital sound transmission

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