ES2038518T3 - Compresor y expansor de audio, y circuitos de reduccion de ruido para utilizacion por usuarios y semi-profesionales. - Google Patents

Compresor y expansor de audio, y circuitos de reduccion de ruido para utilizacion por usuarios y semi-profesionales.

Info

Publication number
ES2038518T3
ES2038518T3 ES199090906438T ES90906438T ES2038518T3 ES 2038518 T3 ES2038518 T3 ES 2038518T3 ES 199090906438 T ES199090906438 T ES 199090906438T ES 90906438 T ES90906438 T ES 90906438T ES 2038518 T3 ES2038518 T3 ES 2038518T3
Authority
ES
Spain
Prior art keywords
frequency
band
stage
sub
action
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
ES199090906438T
Other languages
English (en)
Inventor
Ray Milton Dolby
Stanley Gene Cossette
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.)
Dolby Laboratories Licensing Corp
Original Assignee
Dolby Laboratories Licensing Corp
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 Dolby Laboratories Licensing Corp filed Critical Dolby Laboratories Licensing Corp
Application granted granted Critical
Publication of ES2038518T3 publication Critical patent/ES2038518T3/es
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G9/00—Combinations of two or more types of control, e.g. gain control and tone control
    • H03G9/02—Combinations of two or more types of control, e.g. gain control and tone control in untuned amplifiers
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G9/00—Combinations of two or more types of control, e.g. gain control and tone control
    • H03G9/02—Combinations of two or more types of control, e.g. gain control and tone control in untuned amplifiers
    • H03G9/12—Combinations of two or more types of control, e.g. gain control and tone control in untuned amplifiers having semiconductor devices
    • H03G9/18—Combinations of two or more types of control, e.g. gain control and tone control in untuned amplifiers having semiconductor devices for tone control and volume expansion or compression
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G9/00—Combinations of two or more types of control, e.g. gain control and tone control
    • H03G9/02—Combinations of two or more types of control, e.g. gain control and tone control in untuned amplifiers
    • H03G9/025—Combinations of two or more types of control, e.g. gain control and tone control in untuned amplifiers frequency-dependent volume compression or expansion, e.g. multiple-band systems

Landscapes

  • Reduction Or Emphasis Of Bandwidth Of Signals (AREA)
  • Tone Control, Compression And Expansion, Limiting Amplitude (AREA)
  • Signal Processing Not Specific To The Method Of Recording And Reproducing (AREA)

Abstract

TRES PUESTAS EN PRACTICA DE LA INVENCION RELACIONADAS DE CIRCUITOS DE GAMA DINAMICA DE SEÑALES DE AUDIO PARA COMPRESORES DE SEÑALES DE AUDIO CASEROS Y SEMIPROFESIONALES, EXPANSORES Y SISTEMAS DE REDUCCION DE RUIDO COMPRESORES/EXPANSORES QUE INCORPORAN CIERTAS CARACTERISTICAS BASICAS DE LA GRABACION ESPECTRAL (SR) PROFESIONAL AL TIEMPO QUE ADAPTAN LA SR PARA SER UTILIZADA EN MEDIOS DE GRABACION CASEROS (SOBRE TODO EN CINTAS MAGNETICAS DE AUDIOFRECUENCIA) Y REDUCEN EL COSTE Y COMPLEJIDAD DE LA CIRCUITERIA DE SR. ADEMAS, LAS TRES PUESTAS EN PRACTICA DE LA INVENCION Y SOBRE TODO LA PUESTA EN PRACTICA PREFERIDA, PROPORCIONAN UNA COMPATIBILIDAD SUSTANCIAL CON LOS SISTEMAS DE REDUCCION DE RUIDO CASEROS Y SEMIPROFESIONALES DE TIPO B Y DE TIPO C. SE LOGRA UN RENDIMIENTO SUBJETIVO SUSTANCIALMENTE EQUIVALENTE A SISTEMAS DE AUDIO DE MODULACION POR CODIFICACION DE IMPULSOS DE 16 BITS CON MEDIOS DE CINTA MAGNETICA DE AUDIOFRECUENCIA ANALOGOS. EN LAS TRES PUESTAS EN PRACTICA DE LA INVENCION HAY DOS ETAPASEN CASCADA: (1) UNA ETAPA DE ALTO NIVEL QUE TIENE UNA SUBETAPA DE ACCION-SUSTITUCION DE BANDA FIJA/BANDA MOVIL DE ALTA FRECUENCIA (324A) Y UNA SUBETAPA DE BANDA FIJA DE BAJA FRECUENCIA (328A) Y (2) UNA ETAPA DE BAJO NIVEL QUE SOLO TIENE UNA SUBETAPA DE ACCION-SUSTITUCION DE BANDA FIJA/BANDA MOVIL DE ALTA FRECUENCIA (326A). LAS REGIONES DE ACCION DINAMICA DE LAS SUBETAPAS DE ACCION-SUSTITUCION DE ALTA FRECUENCIA ESTAN ESCALONADAS. CADA UNA DE LAS SUBETAPAS DE ALTA FRECUENCIA PROPORCIONAN HASTA 12 DB DE ACCION DINAMICA (JUNTAS PROPORCIONAN HASTA 24 DB DE ACCION DINAMICA) Y FUNCIONA EN UNA BANDA DE FRECUENCIA DEFINIDA POR UN FILTRO UNIPOLAR QUE TIENE UNA RESPUESTA DE PUESTA A UN LADO DE PASO ALTO CON UNA FRECUENCIA ANGULAR DE 400 HZ. LA SUBETAPA DE BAJA FRECUENCIA PROPORCIONA HASTA 10 DB DE ACCION DINAMICA Y FUNCIONA A UNA BANDA DE FRECUENCIA DEFINIDA POR UN FILTRO UNIPOLAR QUE TIENE UNA RESPUESTA DE PUESTA A UN LADO DE PASO BAJO CON UNA FRECUENCIA ANGULAR DE 200 HZ. LAS CARACTERISTICAS DEL FILTRO UNIPOLAR PROPORCIONAN UNA SUPERPOSICION AMPLIA Y SUAVE DE LAS CARACTERISTICAS DE ALTA FRECUENCIA Y DE BAJA FRECUENCIA. UNAS FORMAS PARTICULARES DE SESGADO ESPECTRAL Y DE ANTISATURACION AUMENTAN EL RENDIMIENTO DE LOS CIRCUITOS QUE TIENEN MEDIOS DE GRABACION CASEROS.
ES199090906438T 1989-04-03 1990-04-03 Compresor y expansor de audio, y circuitos de reduccion de ruido para utilizacion por usuarios y semi-profesionales. Expired - Lifetime ES2038518T3 (es)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US33343189A 1989-04-03 1989-04-03
US42836389A 1989-10-27 1989-10-27

Publications (1)

Publication Number Publication Date
ES2038518T3 true ES2038518T3 (es) 1993-07-16

Family

ID=26988733

Family Applications (1)

Application Number Title Priority Date Filing Date
ES199090906438T Expired - Lifetime ES2038518T3 (es) 1989-04-03 1990-04-03 Compresor y expansor de audio, y circuitos de reduccion de ruido para utilizacion por usuarios y semi-profesionales.

Country Status (12)

Country Link
EP (1) EP0469033B1 (es)
JP (1) JP3317966B2 (es)
KR (1) KR0149651B1 (es)
CN (1) CN1023278C (es)
AT (1) ATE85868T1 (es)
AU (1) AU636141B2 (es)
BR (1) BR9007263A (es)
CA (1) CA2030784C (es)
DE (1) DE69000936T2 (es)
DK (1) DK0469033T3 (es)
ES (1) ES2038518T3 (es)
WO (1) WO1990012453A1 (es)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5424881A (en) 1993-02-01 1995-06-13 Cirrus Logic, Inc. Synchronous read channel
US5910995A (en) * 1995-11-22 1999-06-08 Sony Corporation Of Japan DSP decoder for decoding analog SR encoded audio signals
US5907623A (en) 1995-11-22 1999-05-25 Sony Corporation Of Japan Audio noise reduction system implemented through digital signal processing
EP2487791A1 (en) * 2009-10-07 2012-08-15 Nec Corporation Multiband compressor and adjustment method of same
CN114511474B (zh) * 2022-04-20 2022-07-05 天津恒宇医疗科技有限公司 血管内超声图像的降噪方法、系统、电子设备及存储介质

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4490691A (en) * 1980-06-30 1984-12-25 Dolby Ray Milton Compressor-expander circuits and, circuit arrangements for modifying dynamic range, for suppressing mid-frequency modulation effects and for reducing media overload
US4701722A (en) * 1985-06-17 1987-10-20 Dolby Ray Milton Circuit arrangements for modifying dynamic range using series and parallel circuit techniques
US4736433A (en) * 1985-06-17 1988-04-05 Dolby Ray Milton Circuit arrangements for modifying dynamic range using action substitution and superposition techniques

Also Published As

Publication number Publication date
JP3317966B2 (ja) 2002-08-26
EP0469033A1 (en) 1992-02-05
CN1047946A (zh) 1990-12-19
ATE85868T1 (de) 1993-03-15
CA2030784C (en) 1999-08-10
KR0149651B1 (ko) 1999-09-01
JPH04505842A (ja) 1992-10-08
CN1023278C (zh) 1993-12-22
DK0469033T3 (da) 1993-05-10
DE69000936T2 (de) 1993-06-24
AU5431790A (en) 1990-11-05
EP0469033B1 (en) 1993-02-17
WO1990012453A1 (en) 1990-10-18
BR9007263A (pt) 1992-03-17
AU636141B2 (en) 1993-04-22
DE69000936D1 (de) 1993-03-25
KR920702082A (ko) 1992-08-12
CA2030784A1 (en) 1990-10-04

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