GB0321565D0 - Limiter and detector apparatus and methods - Google Patents

Limiter and detector apparatus and methods

Info

Publication number
GB0321565D0
GB0321565D0 GBGB0321565.4A GB0321565A GB0321565D0 GB 0321565 D0 GB0321565 D0 GB 0321565D0 GB 0321565 A GB0321565 A GB 0321565A GB 0321565 D0 GB0321565 D0 GB 0321565D0
Authority
GB
United Kingdom
Prior art keywords
limiter
methods
detector apparatus
detector
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.)
Ceased
Application number
GBGB0321565.4A
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.)
FULCRUNM SYSTEMS Ltd
Original Assignee
FULCRUNM 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 FULCRUNM SYSTEMS Ltd filed Critical FULCRUNM SYSTEMS Ltd
Priority to GBGB0321565.4A priority Critical patent/GB0321565D0/en
Publication of GB0321565D0 publication Critical patent/GB0321565D0/en
Priority to GB0420544A priority patent/GB2406745B/en
Priority to PCT/GB2004/003929 priority patent/WO2005027541A1/en
Ceased legal-status Critical Current

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 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
    • G10L21/0208—Noise filtering
    • G10L2021/02085—Periodic noise
GBGB0321565.4A 2003-09-15 2003-09-15 Limiter and detector apparatus and methods Ceased GB0321565D0 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
GBGB0321565.4A GB0321565D0 (en) 2003-09-15 2003-09-15 Limiter and detector apparatus and methods
GB0420544A GB2406745B (en) 2003-09-15 2004-09-15 DTMF-tone suppression in telephony systems
PCT/GB2004/003929 WO2005027541A1 (en) 2003-09-15 2004-09-15 Signal-processing methods and apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GBGB0321565.4A GB0321565D0 (en) 2003-09-15 2003-09-15 Limiter and detector apparatus and methods

Publications (1)

Publication Number Publication Date
GB0321565D0 true GB0321565D0 (en) 2003-10-15

Family

ID=29227100

Family Applications (2)

Application Number Title Priority Date Filing Date
GBGB0321565.4A 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 After (1)

Application Number Title Priority Date Filing Date
GB0420544A Expired - Fee Related GB2406745B (en) 2003-09-15 2004-09-15 DTMF-tone suppression in telephony systems

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
GB2406745B (en) 2007-05-09
GB0420544D0 (en) 2004-10-20

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Legal Events

Date Code Title Description
AT Applications terminated before publication under section 16(1)