GB0420544D0 - Signal-processing methods and apparatus - Google Patents

Signal-processing methods and apparatus

Info

Publication number
GB0420544D0
GB0420544D0 GB0420544A GB0420544A GB0420544D0 GB 0420544 D0 GB0420544 D0 GB 0420544D0 GB 0420544 A GB0420544 A GB 0420544A GB 0420544 A GB0420544 A GB 0420544A GB 0420544 D0 GB0420544 D0 GB 0420544D0
Authority
GB
United Kingdom
Prior art keywords
signal
processing methods
methods
processing
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
GB0420544A
Other versions
GB2406745A (en
GB2406745B (en
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.)
FULCRUM SYSTEMS Ltd
Original Assignee
FULCRUM SYSTEMS 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 FULCRUM SYSTEMS Ltd filed Critical FULCRUM SYSTEMS Ltd
Publication of GB0420544D0 publication Critical patent/GB0420544D0/en
Publication of GB2406745A publication Critical patent/GB2406745A/en
Application granted granted Critical
Publication of GB2406745B publication Critical patent/GB2406745B/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H21/00—Adaptive networks
    • H03H21/0012—Digital adaptive filters
    • H03H21/0025—Particular filtering methods
    • H03H21/0027—Particular filtering methods filtering in the frequency domain
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10L—SPEECH ANALYSIS OR SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING; SPEECH OR AUDIO CODING OR DECODING
    • G10L21/00—Processing of the speech or voice signal 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
    • G10L21/0208—Noise filtering
    • G10L2021/02085—Periodic noise
GB0420544A 2003-09-15 2004-09-15 DTMF-tone suppression in telephony systems Expired - Fee Related GB2406745B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB0321565A GB0321565D0 (en) 2003-09-15 2003-09-15 Limiter and detector apparatus and methods

Publications (3)

Publication Number Publication Date
GB0420544D0 true GB0420544D0 (en) 2004-10-20
GB2406745A GB2406745A (en) 2005-04-06
GB2406745B GB2406745B (en) 2007-05-09

Family

ID=29227100

Family Applications (2)

Application Number Title Priority Date Filing Date
GB0321565A Ceased GB0321565D0 (en) 2003-09-15 2003-09-15 Limiter and detector apparatus and methods
GB0420544A Expired - Fee Related GB2406745B (en) 2003-09-15 2004-09-15 DTMF-tone suppression in telephony systems

Family Applications Before (1)

Application Number Title Priority Date Filing Date
GB0321565A Ceased GB0321565D0 (en) 2003-09-15 2003-09-15 Limiter and detector apparatus and methods

Country Status (2)

Country Link
GB (2) GB0321565D0 (en)
WO (1) WO2005027541A1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005013952A1 (en) * 2005-03-26 2006-10-26 Deutsche Telekom Ag Method and system for loading audio clips during a voice call
CN114582374B (en) * 2022-04-29 2022-07-05 北京百瑞互联技术有限公司 Dual-tone multi-frequency detection method, system, medium and equipment

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4538296A (en) * 1983-07-22 1985-08-27 Short Robert S Sound inhibitor for audio transducers
US5029217A (en) * 1986-01-21 1991-07-02 Harold Antin Digital hearing enhancement apparatus
US5631965A (en) * 1992-06-19 1997-05-20 Chang; Joseph S. Hearing protector
US5448646A (en) * 1993-11-01 1995-09-05 Unex Corporation Headset interface assembly
US5889851A (en) * 1996-02-26 1999-03-30 Lucent Technologies Inc. DTMF signal detection/removal using adaptive filters
US5970156A (en) * 1997-02-14 1999-10-19 Telefonaktiebolaget Lm Ericsson Method and apparatus for reducing periodic interference in audio signals
US6347134B1 (en) * 1998-02-05 2002-02-12 Picazo Communications Recording and playing voicemail with improved DTMF detection
GB9905788D0 (en) * 1999-03-12 1999-05-05 Fulcrum Systems Ltd Background-noise reduction

Also Published As

Publication number Publication date
WO2005027541A1 (en) 2005-03-24
GB2406745A (en) 2005-04-06
GB0321565D0 (en) 2003-10-15
GB2406745B (en) 2007-05-09

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee

Effective date: 20130915