WO2001048931A3 - Audio circuit and method for wideband to narrowband transition in a communication device - Google Patents

Audio circuit and method for wideband to narrowband transition in a communication device Download PDF

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Publication number
WO2001048931A3
WO2001048931A3 PCT/EP2000/011364 EP0011364W WO0148931A3 WO 2001048931 A3 WO2001048931 A3 WO 2001048931A3 EP 0011364 W EP0011364 W EP 0011364W WO 0148931 A3 WO0148931 A3 WO 0148931A3
Authority
WO
WIPO (PCT)
Prior art keywords
signal
narrowband
wideband
speech
cell
Prior art date
Application number
PCT/EP2000/011364
Other languages
French (fr)
Other versions
WO2001048931A2 (en
Inventor
Jonathan Gibbs
Dominic Chan
Original Assignee
Motorola 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 Motorola Ltd filed Critical Motorola Ltd
Priority to AU21592/01A priority Critical patent/AU2159201A/en
Publication of WO2001048931A2 publication Critical patent/WO2001048931A2/en
Publication of WO2001048931A3 publication Critical patent/WO2001048931A3/en

Links

Classifications

    • 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
    • G10L21/00—Speech or voice signal processing techniques to produce another audible or non-audible signal, e.g. visual or tactile, in order to modify its quality or its intelligibility
    • G10L21/02—Speech enhancement, e.g. noise reduction or echo cancellation
    • G10L21/038—Speech enhancement, e.g. noise reduction or echo cancellation using band spreading techniques

Landscapes

  • Engineering & Computer Science (AREA)
  • Computational Linguistics (AREA)
  • Quality & Reliability (AREA)
  • Signal Processing (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

A system and mechansim substantially to maintain a perceived level of speech quality upon transition from a wideband to a narrowband service environment is illustrated in (fig 2.). A subscriber unit moving from a cell where a wideband speech channel (e.g. 8kHz) is utilised to a cell where a narrowband speech channel (e.g. 4kHz) is utilised usually experiences an immediately perceivable deterioration in audio signal quality output. This is overcome by generating a pseudo wideband signal from the received narrowband signal by analysing (68) formant components of the received signal, or by duplicating the narrowband spectral profile and reflecting (74) the profile about the narrowband Nyquist point. In the former respect, low frequency components are matched (70) against low frequency signal profiles stored in a database (28), and associated high frequency components are added to complete the speech signal in a manner equivalent to an 8kHz channel. During a transition period, the pseudo wideband signal is progressively band-limited (80) to the narrowband signal of the currently occupied cell.
PCT/EP2000/011364 1999-12-23 2000-11-13 Audio circuit and method for wideband to narrowband transition in a communication device WO2001048931A2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU21592/01A AU2159201A (en) 1999-12-23 2000-11-13 Audio circuit and method for wideband to narrowband transition in a communication device

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9930572A GB2357682B (en) 1999-12-23 1999-12-23 Audio circuit and method for wideband to narrowband transition in a communication device
GB9930572.4 1999-12-23

Publications (2)

Publication Number Publication Date
WO2001048931A2 WO2001048931A2 (en) 2001-07-05
WO2001048931A3 true WO2001048931A3 (en) 2001-12-13

Family

ID=10866988

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2000/011364 WO2001048931A2 (en) 1999-12-23 2000-11-13 Audio circuit and method for wideband to narrowband transition in a communication device

Country Status (3)

Country Link
AU (1) AU2159201A (en)
GB (1) GB2357682B (en)
WO (1) WO2001048931A2 (en)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7289461B2 (en) * 2001-03-15 2007-10-30 Qualcomm Incorporated Communications using wideband terminals
WO2003003770A1 (en) * 2001-06-26 2003-01-09 Nokia Corporation Method for transcoding audio signals, transcoder, network element, wireless communications network and communications system
EP1433166B8 (en) * 2001-09-28 2008-01-02 Nokia Siemens Networks Gmbh & Co. Kg Speech extender and method for estimating a broadband speech signal from a narrowband speech signal
DE10252070B4 (en) 2002-11-08 2010-07-15 Palm, Inc. (n.d.Ges. d. Staates Delaware), Sunnyvale Communication terminal with parameterized bandwidth extension and method for bandwidth expansion therefor
FI119533B (en) * 2004-04-15 2008-12-15 Nokia Corp Coding of audio signals
US20050267739A1 (en) * 2004-05-25 2005-12-01 Nokia Corporation Neuroevolution based artificial bandwidth expansion of telephone band speech
DE602006018618D1 (en) 2005-07-22 2011-01-13 France Telecom METHOD FOR SWITCHING THE RAT AND BANDWIDTH CALIBRABLE AUDIO DECODING RATE
BRPI0818927A2 (en) * 2007-11-02 2015-06-16 Huawei Tech Co Ltd Method and apparatus for audio decoding
GB2476041B (en) * 2009-12-08 2017-03-01 Skype Encoding and decoding speech signals

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0945852A1 (en) * 1998-03-25 1999-09-29 BRITISH TELECOMMUNICATIONS public limited company Speech synthesis

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2779886B2 (en) * 1992-10-05 1998-07-23 日本電信電話株式会社 Wideband audio signal restoration method
US5455888A (en) * 1992-12-04 1995-10-03 Northern Telecom Limited Speech bandwidth extension method and apparatus
EP0732687B2 (en) * 1995-03-13 2005-10-12 Matsushita Electric Industrial Co., Ltd. Apparatus for expanding speech bandwidth
DE19804581C2 (en) * 1998-02-05 2000-08-17 Siemens Ag Method and radio communication system for the transmission of voice information

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0945852A1 (en) * 1998-03-25 1999-09-29 BRITISH TELECOMMUNICATIONS public limited company Speech synthesis

Also Published As

Publication number Publication date
GB9930572D0 (en) 2000-02-16
AU2159201A (en) 2001-07-09
GB2357682B (en) 2004-09-08
GB2357682A (en) 2001-06-27
WO2001048931A2 (en) 2001-07-05

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