ES2144800T3 - Mejora de la resolucion de filtros digitales de coma fija. - Google Patents

Mejora de la resolucion de filtros digitales de coma fija.

Info

Publication number
ES2144800T3
ES2144800T3 ES96943800T ES96943800T ES2144800T3 ES 2144800 T3 ES2144800 T3 ES 2144800T3 ES 96943800 T ES96943800 T ES 96943800T ES 96943800 T ES96943800 T ES 96943800T ES 2144800 T3 ES2144800 T3 ES 2144800T3
Authority
ES
Spain
Prior art keywords
filter
coefficients
margin
resolution
overlap
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.)
Expired - Lifetime
Application number
ES96943800T
Other languages
English (en)
Inventor
Jim Agne Jerker Rasmusson
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.)
Ericsson Inc
Original Assignee
Ericsson Inc
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 Ericsson Inc filed Critical Ericsson Inc
Application granted granted Critical
Publication of ES2144800T3 publication Critical patent/ES2144800T3/es
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H17/00—Networks using digital techniques
    • H03H17/02—Frequency selective networks
    • H03H17/0223—Computation saving measures; Accelerating measures
    • H03H17/0227—Measures concerning the coefficients

Landscapes

  • Engineering & Computer Science (AREA)
  • Computing Systems (AREA)
  • Theoretical Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • Mathematical Physics (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
  • Filters That Use Time-Delay Elements (AREA)
  • Telephone Function (AREA)
  • Ultra Sonic Daignosis Equipment (AREA)
  • Optical Filters (AREA)
  • Feedback Control In General (AREA)

Abstract

EN UNA CONFIGURACION DE FILTRO ADAPTATIVO, SE PROPORCIONA UN MARGEN AMPLIADO DE RESOLUCION DE COEFICIENTES MEDIANTE LA UTILIZACION DE VARIOS FILTROS DE FORMA COMBINADA PARA REPRESENTAR EL MARGEN AMPLIADO DE RESOLUCION. LOS COEFICIENTES DEL PRIMER FILTRO REPRESENTAN LA PARTE ALTA DEL MARGEN AMPLIADO, MIENTRAS QUE LOS COEFICIENTES DEL SEGUNDO FILTRO REPRESENTAN LAS PARTES INFERIORES DEL MARGEN AMPLIADO. LOS DOS FILTROS TRABAJAN EN PARALELO PARA FILTRAR UNA SEÑAL DE ENTRADA Y SE COMBINA LA SALIDA DE LOS FILTROS PARA PRODUCIR LA SEÑAL FILTRADA. UNA FRACCION DE LOS VALORES BAJOS DE LOS COEFICIENTES DEL PRIMER FILTRO SE SOLAPAN CON UNA FRACCION DE LOS VALORES SUPERIORES DE LOS COEFICIENTES DEL SEGUNDO FILTRO, TRAS DE LO CUAL SE REINICIALIZAN LAS FRACCIONES EN SOLAPAMIENTO DE LOS COEFICIENTES DEL SEGUNDO FILTRO. DE ACUERDO CON OTRO ASPECTO DE LA INVENCION, SE PUEDE AJUSTAR LA CANTIDAD DE SOLAPAMIENTO PARA CAMBIAR DINAMICAMENTE EL MARGEN DE RESOLUCION DEL FILTRO. LOS COEFICIENTES DE LOS DOS FILTROSPUEDEN VARIAR EL SOLAPAMIENTO PARA AMPLIAR O DISMINUIR EL MARGEN DE RESOLUCION EN RESPUESTA A CAMBIOS EN EL SISTEMA QUE SE CONTROLA. TAMBIEN SE PUEDE AJUSTAR EL GRADO DE SOLAPAMIENTO PARA PROPORCIONAR UN MARGEN ADECUADO DE RESOLUCION LO QUE SE CORRESPONDE A CUANDO EL SISTEMA ES ESTABLE. SE USA UN PROCESO ADAPTATIVO PARA ACTUALIZAR LOS COEFICIENTES DE FILTRADO.
ES96943800T 1995-12-27 1996-12-23 Mejora de la resolucion de filtros digitales de coma fija. Expired - Lifetime ES2144800T3 (es)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US08/578,941 US5777913A (en) 1995-12-27 1995-12-27 Resolution enhancement of fixed point digital filters

Publications (1)

Publication Number Publication Date
ES2144800T3 true ES2144800T3 (es) 2000-06-16

Family

ID=24314958

Family Applications (1)

Application Number Title Priority Date Filing Date
ES96943800T Expired - Lifetime ES2144800T3 (es) 1995-12-27 1996-12-23 Mejora de la resolucion de filtros digitales de coma fija.

Country Status (14)

Country Link
US (1) US5777913A (es)
EP (1) EP0870366B1 (es)
JP (1) JP2000502862A (es)
KR (1) KR19990076871A (es)
CN (1) CN1209226A (es)
AU (1) AU715559B2 (es)
BR (1) BR9612288A (es)
DE (1) DE69607487T2 (es)
DK (1) DK0870366T3 (es)
ES (1) ES2144800T3 (es)
GR (1) GR3033292T3 (es)
MY (1) MY121589A (es)
PL (1) PL181858B1 (es)
WO (1) WO1997024805A1 (es)

Families Citing this family (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6185300B1 (en) * 1996-12-31 2001-02-06 Ericsson Inc. Echo canceler for use in communications system
US6725061B1 (en) * 1999-01-12 2004-04-20 Qualcomm, Incorporated System and method for the automatic identification of accessories coupled to a wireless communication device
FR2820258A1 (fr) * 2001-01-30 2002-08-02 Sagem Procede d'adaptation de signaux numeriques echantillones et filtre pour la mise en oeuvre du procede
US7062038B1 (en) * 2002-12-17 2006-06-13 Cisco Technology, Inc. System and method of using two coefficient banks in an adaptive echo canceller
US8275142B2 (en) * 2007-03-09 2012-09-25 Fortemedia, Inc. Acoustic echo cancellation system
JP2009049977A (ja) * 2007-07-26 2009-03-05 Yamaha Corp エコーキャンセラ
US7839758B1 (en) * 2008-09-23 2010-11-23 Net Logic Microsystems, Inc. Analog echo canceller with interpolating output
WO2014147552A1 (en) * 2013-03-19 2014-09-25 Koninklijke Philips N.V. Method and apparatus for audio processing
US11302054B2 (en) 2014-04-05 2022-04-12 Sony Interactive Entertainment Europe Limited Varying effective resolution by screen location by changing active color sample count within multiple render targets
US10068311B2 (en) * 2014-04-05 2018-09-04 Sony Interacive Entertainment LLC Varying effective resolution by screen location by changing active color sample count within multiple render targets
US9710881B2 (en) 2014-04-05 2017-07-18 Sony Interactive Entertainment America Llc Varying effective resolution by screen location by altering rasterization parameters
US9865074B2 (en) 2014-04-05 2018-01-09 Sony Interactive Entertainment America Llc Method for efficient construction of high resolution display buffers
US9652882B2 (en) 2014-04-05 2017-05-16 Sony Interactive Entertainment America Llc Gradient adjustment for texture mapping for multiple render targets with resolution that varies by screen location
US9495790B2 (en) 2014-04-05 2016-11-15 Sony Interactive Entertainment America Llc Gradient adjustment for texture mapping to non-orthonormal grid
US9710957B2 (en) 2014-04-05 2017-07-18 Sony Interactive Entertainment America Llc Graphics processing enhancement by tracking object and/or primitive identifiers
US10783696B2 (en) 2014-04-05 2020-09-22 Sony Interactive Entertainment LLC Gradient adjustment for texture mapping to non-orthonormal grid
US9836816B2 (en) 2014-04-05 2017-12-05 Sony Interactive Entertainment America Llc Varying effective resolution by screen location in graphics processing by approximating projection of vertices onto curved viewport
EP3324543B1 (en) * 2016-11-18 2020-01-08 Nxp B.V. Adaptive filter and method of operating an adaptive filter

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4922530A (en) * 1988-03-18 1990-05-01 Tellabs, Inc. Adaptive filter with coefficient averaging and method
EP0543568A2 (en) * 1991-11-22 1993-05-26 AT&T Corp. High resolution filtering using low resolution processors
US5535150A (en) * 1993-04-20 1996-07-09 Massachusetts Institute Of Technology Single chip adaptive filter utilizing updatable weighting techniques
JPH08125593A (ja) * 1994-10-28 1996-05-17 Fujitsu Ltd フィルタ係数の推定装置
JP3359460B2 (ja) * 1995-03-20 2002-12-24 沖電気工業株式会社 適応フィルタ及びエコーキャンセラ

Also Published As

Publication number Publication date
EP0870366B1 (en) 2000-03-29
MY121589A (en) 2006-02-28
DE69607487T2 (de) 2000-09-07
PL327568A1 (en) 1998-12-21
GR3033292T3 (en) 2000-09-29
US5777913A (en) 1998-07-07
AU715559B2 (en) 2000-02-03
WO1997024805A1 (en) 1997-07-10
PL181858B1 (pl) 2001-09-28
DE69607487D1 (de) 2000-05-04
AU1294697A (en) 1997-07-28
KR19990076871A (ko) 1999-10-25
EP0870366A1 (en) 1998-10-14
DK0870366T3 (da) 2000-08-21
JP2000502862A (ja) 2000-03-07
CN1209226A (zh) 1999-02-24
BR9612288A (pt) 1999-07-13

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