GB1120541A - Improvements in noise reduction systems - Google Patents

Improvements in noise reduction systems

Info

Publication number
GB1120541A
GB1120541A GB3439465A GB3439465A GB1120541A GB 1120541 A GB1120541 A GB 1120541A GB 3439465 A GB3439465 A GB 3439465A GB 3439465 A GB3439465 A GB 3439465A GB 1120541 A GB1120541 A GB 1120541A
Authority
GB
United Kingdom
Prior art keywords
limiter
signal
paths
output
path
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
Application number
GB3439465A
Other languages
English (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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to GB3439465A priority Critical patent/GB1120541A/en
Priority to NL6611156A priority patent/NL147297B/xx
Priority to CH1140866A priority patent/CH467560A/de
Priority to DE19661487276 priority patent/DE1487276C3/de
Priority to FR72846A priority patent/FR1489418A/fr
Priority to JP41052369A priority patent/JPS4841044B1/ja
Priority to BE712376D priority patent/BE712376A/xx
Publication of GB1120541A publication Critical patent/GB1120541A/en
Priority to JP47007717A priority patent/JPS4842361B1/ja
Priority to JP771872A priority patent/JPS5026887B1/ja
Priority to JP13183273A priority patent/JPS5114842B1/ja
Expired legal-status Critical Current

Links

Classifications

    • 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
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G11/00—Limiting amplitude; Limiting rate of change of amplitude ; Clipping in general
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G11/00—Limiting amplitude; Limiting rate of change of amplitude ; Clipping in general
    • H03G11/002—Limiting amplitude; Limiting rate of change of amplitude ; Clipping in general without controlling loop
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Tone Control, Compression And Expansion, Limiting Amplitude (AREA)
  • Reduction Or Emphasis Of Bandwidth Of Signals (AREA)
  • Signal Processing Not Specific To The Method Of Recording And Reproducing (AREA)
GB3439465A 1965-08-11 1965-08-11 Improvements in noise reduction systems Expired GB1120541A (en)

Priority Applications (10)

Application Number Priority Date Filing Date Title
GB3439465A GB1120541A (en) 1965-08-11 1965-08-11 Improvements in noise reduction systems
NL6611156A NL147297B (nl) 1965-08-11 1966-08-08 Inrichting voor ruisverzwakking.
CH1140866A CH467560A (de) 1965-08-11 1966-08-09 Ubertragungsanlage mit mindestens einer als Signalkompressor oder Signalexpander wirkenden Schaltungsanordnung
DE19661487276 DE1487276C3 (de) 1965-08-11 1966-08-10 Baustein für eine Schaltungsanordnung zur Beeinflussung der Dynamik von Audiosignalen durch Kompression bzw. Expansion zur Störgeräuschvermittlung
JP41052369A JPS4841044B1 (zh) 1965-08-11 1966-08-11
FR72846A FR1489418A (fr) 1965-08-11 1966-08-11 Perfectionnements aux dispositifs d'atténuation du bruit
BE712376D BE712376A (zh) 1965-08-11 1968-03-18
JP47007717A JPS4842361B1 (zh) 1965-08-11 1972-01-21
JP771872A JPS5026887B1 (zh) 1965-08-11 1972-01-21
JP13183273A JPS5114842B1 (zh) 1965-08-11 1973-11-26

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
GB3439465A GB1120541A (en) 1965-08-11 1965-08-11 Improvements in noise reduction systems
GB4313665 1965-10-11
GB236866 1966-01-18

Publications (1)

Publication Number Publication Date
GB1120541A true GB1120541A (en) 1968-07-17

Family

ID=27254067

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3439465A Expired GB1120541A (en) 1965-08-11 1965-08-11 Improvements in noise reduction systems

Country Status (6)

Country Link
JP (4) JPS4841044B1 (zh)
BE (1) BE712376A (zh)
CH (1) CH467560A (zh)
DE (1) DE1487276C3 (zh)
GB (1) GB1120541A (zh)
NL (1) NL147297B (zh)

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2102866A1 (de) * 1970-01-23 1971-08-05 Dolby Laboratories Inc Begrenzerschaltung
DE2211374A1 (de) * 1971-03-12 1972-09-21 Dolby Laboratories Inc Schaltungsanordnung zur Änderung des dynamischen Bereiches von Signalen
US3818362A (en) * 1971-05-04 1974-06-18 Philips Corp Noise reduction circuit
FR2399765A1 (fr) * 1977-08-06 1979-03-02 Licentia Gmbh Montage de compression ou extension de la dynamique
DE2838293A1 (de) * 1977-09-02 1979-03-08 Sanyo Electric Co Schaltung zur geraeuschminderung mit geteiltem frequenzgebiet mit dynamikpresser und dynamikdehner
FR2457599A1 (fr) * 1979-05-24 1980-12-19 Sony Corp Appareillage pour enregistrer et/ou reproduire un signal d'information et comportant au moins un circuit de commande de gain pour un systeme de reduction de bruit
FR2490856A1 (fr) * 1980-09-22 1982-03-26 Elison Sarl Appareil pour la reduction du bruit de fond du type a analyse spectrale en temps reel
DE3134295A1 (de) * 1980-08-29 1982-04-22 Victor Company Of Japan, Ltd., Yokohama, Kanagawa Geraeuschverminderungseinrichtung
FR2517496A1 (fr) * 1981-12-01 1983-06-03 Dolby Ray Perfectionnements a des montages permettant de modifier une gamme dynamique
GB2143105A (en) * 1980-04-21 1985-01-30 Bodysonic Kk A system for discriminating between a human voice signal and other sound signals
US4540946A (en) * 1980-06-06 1985-09-10 National Research Development Corp. Variable characteristic filters
US4574202A (en) * 1981-10-15 1986-03-04 Tokyo Shibaura Denki Kabushiki Kaisha Rectifier circuit with attack time variable in response to an input signal level
GB2189366A (en) * 1986-04-17 1987-10-21 British Broadcasting Corp Method and apparatus for conveying information signals
GB2238205A (en) * 1989-09-01 1991-05-22 Samsung Electronics Co Ltd Controlling contrast in a digital television receiver

Families Citing this family (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3729693A (en) * 1971-08-02 1973-04-24 R Dolby Compressor/expander switching methods and apparatus
GB1438711A (en) * 1973-01-23 1976-06-09 Dolby Laboratories Inc Calibration oscillators for noise reduction systems
CA1000617A (en) * 1973-05-17 1976-11-30 Ray M. Dolby Compressors, expanders and noise reduction systems
DE2530144C3 (de) * 1975-07-05 1981-11-19 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Verstärker mit veränderbarem Übertragungsmaß
DE2542745C2 (de) * 1975-09-25 1983-06-09 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Verstärker mit veränderbarem Übertragungsmaß, insbesondere für ein Kompander-System
DE2655325C2 (de) * 1976-12-07 1984-01-26 Saba Gmbh, 7730 Villingen-Schwenningen Magnetbandgerät mit einer im Wiedergabebetrieb wirksamen Rauschunterdrückungs-Schaltung
DE3029441A1 (de) * 1980-08-02 1982-03-04 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Signaluebertragungsschaltung mit steuerbarem uebertragungsmass
JPS5769891A (en) * 1980-10-17 1982-04-28 Tokyo Shibaura Electric Co Washing machine doubling as hydroextracting
JPS57138009A (en) * 1981-02-20 1982-08-26 Hitachi Ltd Magnetic recorder and reproducer
JPS57140085A (en) * 1981-02-23 1982-08-30 Hitachi Ltd Audio signal recording and reproducing circuit
DE3305938A1 (de) * 1983-02-21 1984-08-23 Telefunken Fernseh Und Rundfunk Gmbh, 3000 Hannover Schaltungsanordnung zur erzeugung einer von einer wechselspannung abhaengigen steuergleichspannung
DE3323751C1 (de) * 1983-07-01 1984-11-22 Telefunken Fernseh Und Rundfunk Gmbh, 3000 Hannover System zur UEbertragung eines frequenzmodulierten Tontraegers
JPS60111137A (ja) * 1983-11-18 1985-06-17 Shimadzu Corp 定荷重材料試験機
US5067157A (en) * 1989-02-03 1991-11-19 Pioneer Electronic Corporation Noise reduction apparatus in an FM stereo tuner
US5253299A (en) * 1989-02-03 1993-10-12 Pioneer Electronic Corporation Noise reduction apparatus in an FM stereo tuner

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE754298C (de) * 1935-07-04 1952-07-17 Emi Ltd Niederfrequentes UEbertragungssystem mit selbsttaetiger Amplituden-regelung durch eine quer zum UEbertragungsweg geschaltete Impedanz-Mehrgitterroehre
US2171671A (en) * 1936-05-20 1939-09-05 Emi Ltd Thermionic valve circuit
GB643574A (en) * 1946-01-19 1950-09-20 Hermon Hosmer Scott Improvements in apparatus or systems for transmitting electric signals
US2817715A (en) * 1952-07-15 1957-12-24 California Research Corp Amplifier circuit having linear and non-linear amplification ranges
US2925529A (en) * 1952-11-04 1960-02-16 Bell Telephone Labor Inc Non-linear transmission circuits
DE1048950B (de) * 1956-07-19 1959-01-22 Siemens Ag Nachrichtenuebertragungssystem mit einer Anordnung zur Geraeuschunterdrueckung
GB856892A (en) * 1957-11-14 1960-12-21 Collins Radio Co Means for reducing the threshold of angular-modulation receivers
US2969459A (en) * 1957-11-14 1961-01-24 Collins Radio Co Method and means for reducing the threshold of angular-modulation receivers
DE1120171B (de) * 1959-12-24 1961-12-21 Carl Lindstroem Ges M B H Verfahren zur Erhoehung der mittleren Aussteuerung von Tonaufnahmen
US3111635A (en) * 1960-05-05 1963-11-19 Fairchild Recording Equipment Method and apparatus for eliminating overloading in modulating systems having pre-emphasis means
FR1374370A (fr) * 1963-06-07 1964-10-09 Emi Ltd Perfectionnements à l'enregistrement et la transmission des sons
FR1392138A (fr) * 1964-04-08 1965-03-12 Rca Corp Dispositif pour la transmission de sons audibles

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2167266C2 (de) * 1970-01-23 1982-12-02 Dolby Laboratories Inc., San Francisco, Calif. Begrenzerschaltung
DE2102866A1 (de) * 1970-01-23 1971-08-05 Dolby Laboratories Inc Begrenzerschaltung
DE2211374A1 (de) * 1971-03-12 1972-09-21 Dolby Laboratories Inc Schaltungsanordnung zur Änderung des dynamischen Bereiches von Signalen
DE2211347A1 (de) * 1971-03-12 1972-09-28 Dolby Laboratories Inc Schaltungsanordnung zur Veränderung des dynamischen Bereiches von Signalen
US3818362A (en) * 1971-05-04 1974-06-18 Philips Corp Noise reduction circuit
FR2399765A1 (fr) * 1977-08-06 1979-03-02 Licentia Gmbh Montage de compression ou extension de la dynamique
DE2838293A1 (de) * 1977-09-02 1979-03-08 Sanyo Electric Co Schaltung zur geraeuschminderung mit geteiltem frequenzgebiet mit dynamikpresser und dynamikdehner
FR2457599A1 (fr) * 1979-05-24 1980-12-19 Sony Corp Appareillage pour enregistrer et/ou reproduire un signal d'information et comportant au moins un circuit de commande de gain pour un systeme de reduction de bruit
GB2143105A (en) * 1980-04-21 1985-01-30 Bodysonic Kk A system for discriminating between a human voice signal and other sound signals
US4540946A (en) * 1980-06-06 1985-09-10 National Research Development Corp. Variable characteristic filters
DE3134295A1 (de) * 1980-08-29 1982-04-22 Victor Company Of Japan, Ltd., Yokohama, Kanagawa Geraeuschverminderungseinrichtung
FR2490856A1 (fr) * 1980-09-22 1982-03-26 Elison Sarl Appareil pour la reduction du bruit de fond du type a analyse spectrale en temps reel
US4574202A (en) * 1981-10-15 1986-03-04 Tokyo Shibaura Denki Kabushiki Kaisha Rectifier circuit with attack time variable in response to an input signal level
FR2517496A1 (fr) * 1981-12-01 1983-06-03 Dolby Ray Perfectionnements a des montages permettant de modifier une gamme dynamique
GB2189366A (en) * 1986-04-17 1987-10-21 British Broadcasting Corp Method and apparatus for conveying information signals
GB2189366B (en) * 1986-04-17 1989-12-28 British Broadcasting Corp Method and apparatus for conveying information signals
US4903125A (en) * 1986-04-17 1990-02-20 British Broadcasting Corporation Method and apparatus for conveying information signals
GB2238205A (en) * 1989-09-01 1991-05-22 Samsung Electronics Co Ltd Controlling contrast in a digital television receiver
GB2238205B (en) * 1989-09-01 1994-02-09 Samsung Electronics Co Ltd Controlling contrast in a digital television receiver

Also Published As

Publication number Publication date
NL6611156A (zh) 1967-02-13
JPS5114842B1 (zh) 1976-05-12
CH467560A (de) 1969-01-15
JPS5026887B1 (zh) 1975-09-04
NL147297B (nl) 1975-09-15
DE1487276A1 (de) 1969-03-20
JPS4841044B1 (zh) 1973-12-04
JPS4842361B1 (zh) 1973-12-12
BE712376A (zh) 1968-07-31
DE1487276C3 (de) 1982-01-07
DE1487276B2 (de) 1975-02-20

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