JPS5511616A - Transmission system for redundancy-eliminated pcm voice - Google Patents

Transmission system for redundancy-eliminated pcm voice

Info

Publication number
JPS5511616A
JPS5511616A JP8376378A JP8376378A JPS5511616A JP S5511616 A JPS5511616 A JP S5511616A JP 8376378 A JP8376378 A JP 8376378A JP 8376378 A JP8376378 A JP 8376378A JP S5511616 A JPS5511616 A JP S5511616A
Authority
JP
Japan
Prior art keywords
frame
frames
continuation
vocal
eliminated
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.)
Granted
Application number
JP8376378A
Other languages
Japanese (ja)
Other versions
JPS5941599B2 (en
Inventor
Shinji Hayashi
Kazuhiko Kakehi
Katsuyoshi Azeyanagi
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.)
Nippon Telegraph and Telephone Corp
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 JP53083763A priority Critical patent/JPS5941599B2/en
Publication of JPS5511616A publication Critical patent/JPS5511616A/en
Publication of JPS5941599B2 publication Critical patent/JPS5941599B2/en
Expired 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)
  • Time-Division Multiplex Systems (AREA)

Abstract

PURPOSE:To increase the compression effect through a simple constitution and thus to obtain the excellent reproduced voice by eliminating the redundant continuation part of the vocal sound to transmit only the frame information and then giving the interpolation reproduction to the continuation part at the time of demodulation. CONSTITUTION:The PCM aural signal given from input terminal 11 with sampling of 8K Hz and quantization of 8 bits applied is divided 12 into 1-frame 80 samples (10ms). Then the signal of each frame is sent to arithmetic part 13 to undergo the calculation of the average power and the zero cross number to decide the frames for the silence, voiceless sound and vocal sound each; and these frames are added to the initial sample of each frame. While the frame-divided 12 PCM signal is supplied also to switch circuit 14. And the silence frame, voiceless frame and vocal frame are distributed fo frame eliminating part 15, but rearranging part 16 and steady frame omitting part 17 respectively. In case the changing rate is under the fixed level between the adjacent frames of the frame average power at part 17, the information showing this is sent from arithmetic part 13. And the redundant continuation parts excepting the frame information are eliminated for the subsequent frames.
JP53083763A 1978-07-10 1978-07-10 Redundancy removed PCM audio transmission method Expired JPS5941599B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP53083763A JPS5941599B2 (en) 1978-07-10 1978-07-10 Redundancy removed PCM audio transmission method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP53083763A JPS5941599B2 (en) 1978-07-10 1978-07-10 Redundancy removed PCM audio transmission method

Publications (2)

Publication Number Publication Date
JPS5511616A true JPS5511616A (en) 1980-01-26
JPS5941599B2 JPS5941599B2 (en) 1984-10-08

Family

ID=13811608

Family Applications (1)

Application Number Title Priority Date Filing Date
JP53083763A Expired JPS5941599B2 (en) 1978-07-10 1978-07-10 Redundancy removed PCM audio transmission method

Country Status (1)

Country Link
JP (1) JPS5941599B2 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS578996A (en) * 1980-06-19 1982-01-18 Mitsubishi Electric Corp Controller of storage circuit
JPS57186845A (en) * 1981-05-14 1982-11-17 Edowaado W Mooru Minimum space digital memory for analog information
JPH02146100A (en) * 1988-11-28 1990-06-05 Matsushita Electric Ind Co Ltd Voice encoding device and voice decoding device

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS578996A (en) * 1980-06-19 1982-01-18 Mitsubishi Electric Corp Controller of storage circuit
JPS57186845A (en) * 1981-05-14 1982-11-17 Edowaado W Mooru Minimum space digital memory for analog information
JPH02146100A (en) * 1988-11-28 1990-06-05 Matsushita Electric Ind Co Ltd Voice encoding device and voice decoding device

Also Published As

Publication number Publication date
JPS5941599B2 (en) 1984-10-08

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