ZA704903B - Improved filter/limiters for noise reduction systems - Google Patents

Improved filter/limiters for noise reduction systems

Info

Publication number
ZA704903B
ZA704903B ZA704903A ZA704903A ZA704903B ZA 704903 B ZA704903 B ZA 704903B ZA 704903 A ZA704903 A ZA 704903A ZA 704903 A ZA704903 A ZA 704903A ZA 704903 B ZA704903 B ZA 704903B
Authority
ZA
South Africa
Prior art keywords
limiters
noise reduction
improved filter
reduction systems
systems
Prior art date
Application number
ZA704903A
Other languages
English (en)
Inventor
R Dolby
Original Assignee
Dolby Laboratories 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
Priority claimed from GB3646669A external-priority patent/GB1279634A/en
Application filed by Dolby Laboratories Inc filed Critical Dolby Laboratories Inc
Publication of ZA704903B publication Critical patent/ZA704903B/xx

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
    • 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
    • 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
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/62—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission for providing a predistortion of the signal in the transmitter and corresponding correction in the receiver, e.g. for improving the signal/noise ratio
    • H04B1/64—Volume compression or expansion arrangements

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • 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)
ZA704903A 1969-07-21 1970-07-16 Improved filter/limiters for noise reduction systems ZA704903B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3646669A GB1279634A (en) 1968-11-01 1968-11-01 Signal compressors and expanders

Publications (1)

Publication Number Publication Date
ZA704903B true ZA704903B (en) 1971-03-31

Family

ID=10388414

Family Applications (1)

Application Number Title Priority Date Filing Date
ZA704903A ZA704903B (en) 1969-07-21 1970-07-16 Improved filter/limiters for noise reduction systems

Country Status (12)

Country Link
US (1) US3665345A (xx)
JP (1) JPS5026324B1 (xx)
AT (1) AT308831B (xx)
BE (1) BE753495A (xx)
CH (1) CH514252A (xx)
DE (1) DE2035479C3 (xx)
DK (1) DK142738B (xx)
FR (1) FR2055373A5 (xx)
NL (1) NL174514C (xx)
NO (1) NO130413B (xx)
SE (1) SE366183B (xx)
ZA (1) ZA704903B (xx)

Families Citing this family (44)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US29529A (en) * 1860-08-07 Machine eoe
GB1390341A (en) * 1971-03-12 1975-04-09 Dolby Laboratories Inc Signal compressors and expanders
NL163388C (nl) * 1971-05-04 1980-08-15 Philips Nv Ruisonderdrukkingsschakeling.
JPS5334698B1 (xx) * 1971-06-09 1978-09-21
JPS5648883B1 (xx) * 1971-07-24 1981-11-18
US3911371A (en) * 1971-07-24 1975-10-07 Sony Corp Signal transmission system
JPS52661B2 (xx) * 1972-01-11 1977-01-10
JPS4881450A (xx) * 1972-02-01 1973-10-31
GB1432763A (en) * 1972-05-02 1976-04-22 Dolby Laboratories Inc Compressors expanders and noise reduction systems
JPS5093602A (xx) * 1973-12-20 1975-07-25
US3946211A (en) * 1974-07-17 1976-03-23 Leeds & Northrup Company Amplitude limited filter
DE2437609C2 (de) * 1974-08-05 1983-10-27 Siemens AG, 1000 Berlin und 8000 München Schaltung zur stufenlos einstellbaren Leitungsentzerrung
US3944853A (en) * 1974-08-12 1976-03-16 Basf Aktiengesellschaft Video recorder pre-emphasis, de-emphasis circuits
US3902131A (en) * 1974-09-06 1975-08-26 Quadracast Systems Tandem audio dynamic range expander
US4045731A (en) * 1974-11-21 1977-08-30 Takeda Riken Kogyo Kabushikikaisha Filter having an automatically controlled variable cut-off frequency
US3940709A (en) * 1974-12-19 1976-02-24 Ampex Corporation Equalization circuit
US4155041A (en) 1976-05-13 1979-05-15 Burns Richard C System for reducing noise transients
US4118640A (en) * 1976-10-22 1978-10-03 National Semiconductor Corporation JFET base junction transistor clamp
US4101849A (en) * 1976-11-08 1978-07-18 Dbx, Inc. Adaptive filter
DE2855259A1 (de) * 1977-12-27 1979-07-05 Dolby Lab Licensing Corp Vorrichtung und system zur aufzeichnung von tonfrequenzsignalen auf einem magnetischen aufzeichnungstraeger
US4211931A (en) * 1977-12-27 1980-07-08 General Electric Company Electronic speed error signal processing circuit
JPS5545112A (en) * 1978-09-22 1980-03-29 Sony Corp Signal transmitter
JPS55156431A (en) * 1979-05-24 1980-12-05 Sony Corp Noise reduction system
US4327331A (en) * 1979-11-07 1982-04-27 Pioneer Electronic Corporation Audio amplifier device
US4376916A (en) * 1980-05-29 1983-03-15 Cbs Inc. Signal compression and expansion system
JPS5752239A (en) * 1980-09-09 1982-03-27 Sony Corp Noise reducing circuit
JPS5752240A (en) * 1980-09-09 1982-03-27 Sony Corp Noise reducing circuit
US4396893A (en) * 1981-06-01 1983-08-02 The United States Of America As Represented By The Secretary Of The Navy Frequency selective limiter
GB2111355B (en) * 1981-12-01 1985-02-13 Ray Milton Dolby Improvements in circuit arrangements for modifying dynamic range
US4809338A (en) * 1985-07-05 1989-02-28 Harman International Industries, Incorporated Automotive sound system
CA1269138A (en) * 1986-03-03 1990-05-15 Ray Milton Dolby Attenuator circuit employing bootstrapping
KR960014115B1 (ko) * 1986-03-03 1996-10-14 밀톤 돌비 레이 부우트스트래핑(Bootstrapping)을 사용한 감쇄회로
US4759065A (en) * 1986-09-22 1988-07-19 Harman International Industries, Incorporated Automotive sound system
DE3642984A1 (de) * 1986-12-17 1988-06-30 Thomson Brandt Gmbh Schaltung zur dynamik-kompression und/oder -expansion eines signals
US5191338A (en) * 1991-11-29 1993-03-02 General Electric Company Wideband transmission-mode FET linearizer
US5471527A (en) * 1993-12-02 1995-11-28 Dsc Communications Corporation Voice enhancement system and method
US7225001B1 (en) * 2000-04-24 2007-05-29 Telefonaktiebolaget Lm Ericsson (Publ) System and method for distributed noise suppression
KR100403637B1 (ko) * 2002-01-26 2003-10-30 삼성전자주식회사 출력 일그러짐을 최소화하는 파워 앰프 클리핑 회로
DE102004050088B4 (de) * 2004-10-14 2010-05-06 Siemens Ag Verfahren und Vorrichtung zum Übertragen von Signalen
US20060293709A1 (en) * 2005-06-24 2006-12-28 Bojarski Raymond A Tissue repair device
EP2232700B1 (en) 2007-12-21 2014-08-13 Dts Llc System for adjusting perceived loudness of audio signals
US8538042B2 (en) 2009-08-11 2013-09-17 Dts Llc System for increasing perceived loudness of speakers
US9312829B2 (en) 2012-04-12 2016-04-12 Dts Llc System for adjusting loudness of audio signals in real time
KR102163050B1 (ko) * 2015-03-12 2020-10-08 삼성전기주식회사 전력 증폭기 및 전력 증폭기의 위상 보정 방법

Also Published As

Publication number Publication date
NL174514C (nl) 1984-06-18
SE366183B (xx) 1974-04-08
BE753495A (fr) 1970-12-16
DK142738B (da) 1981-01-05
FR2055373A5 (xx) 1971-05-07
AT308831B (de) 1973-07-25
NL7010739A (xx) 1971-01-25
US3665345A (en) 1972-05-23
DE2035479C3 (de) 1979-11-08
NL174514B (nl) 1984-01-16
DE2035479A1 (de) 1971-02-18
DE2035479B2 (de) 1979-03-22
CH514252A (de) 1971-10-15
DK142738C (xx) 1981-08-10
NO130413B (xx) 1974-08-26
JPS5026324B1 (xx) 1975-08-30

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