CA2217693A1 - Transcoder with prevention of tandem coding of speech - Google Patents

Transcoder with prevention of tandem coding of speech

Info

Publication number
CA2217693A1
CA2217693A1 CA002217693A CA2217693A CA2217693A1 CA 2217693 A1 CA2217693 A1 CA 2217693A1 CA 002217693 A CA002217693 A CA 002217693A CA 2217693 A CA2217693 A CA 2217693A CA 2217693 A1 CA2217693 A1 CA 2217693A1
Authority
CA
Canada
Prior art keywords
speech
pcm
transcoder
mobile
coding
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
CA002217693A
Other languages
French (fr)
Other versions
CA2217693C (en
Inventor
Matti Lehtimaki
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.)
Conversant Wireless Licensing SARL
Original Assignee
Individual
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
Priority claimed from FI951807A external-priority patent/FI101439B1/en
Application filed by Individual filed Critical Individual
Publication of CA2217693A1 publication Critical patent/CA2217693A1/en
Application granted granted Critical
Publication of CA2217693C publication Critical patent/CA2217693C/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/08—Access point devices
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10L—SPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; SPEECH OR AUDIO CODING OR DECODING
    • G10L19/00—Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis
    • G10L19/04—Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis using predictive techniques
    • G10L19/16—Vocoder architecture
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/18—Service support devices; Network management devices
    • H04W88/181—Transcoding devices; Rate adaptation devices

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Computational Linguistics (AREA)
  • Health & Medical Sciences (AREA)
  • Audiology, Speech & Language Pathology (AREA)
  • Human Computer Interaction (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

The invention relates to a transcoder (TRCU1, TRCU2) having means for preventing tandem coding of speech in a mobile to mobile (MS1, MS2) call within a mobile communication system which employs a speech coding method for reducing transmission rate on the radio path. The transcoder (TRCU1, TRCU2) comprises a speech coder (52, 73) which encodes the speech signal into speech parameters for transmission to a mobile station, and decodes the speech parameters received from the mobile station into a speech signal according to said speech coding method, as well as a PCM coder (54, 72) for transmitting an uplink speech signal to and for receiving a downlink speech signal from a PCM interface in the form of PCM speech samples. In addition to the normal operation, the transcoder transmits and receives speech parameters through a PCM interface in a subchannel formed by least significant bits of the PCM speech samples. Thus, it is possible to prevent tandem coding but at the same time maintain the standard PCM interface and the signalling and services associated thereto.
CA002217693A 1995-04-13 1996-04-11 Transcoder with prevention of tandem coding of speech Expired - Lifetime CA2217693C (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FI951807 1995-04-13
FI951807A FI101439B1 (en) 1995-04-13 1995-04-13 Transcoder with tandem coding blocking
PCT/FI1996/000192 WO1996032823A1 (en) 1995-04-13 1996-04-11 Transcoder with prevention of tandem coding of speech

Publications (2)

Publication Number Publication Date
CA2217693A1 true CA2217693A1 (en) 1996-10-17
CA2217693C CA2217693C (en) 2006-10-10

Family

ID=37111767

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002217693A Expired - Lifetime CA2217693C (en) 1995-04-13 1996-04-11 Transcoder with prevention of tandem coding of speech

Country Status (1)

Country Link
CA (1) CA2217693C (en)

Also Published As

Publication number Publication date
CA2217693C (en) 2006-10-10

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Effective date: 20160411