SE8104062L - SOUND REDUCTION CIRCUIT - Google Patents

SOUND REDUCTION CIRCUIT

Info

Publication number
SE8104062L
SE8104062L SE8104062A SE8104062A SE8104062L SE 8104062 L SE8104062 L SE 8104062L SE 8104062 A SE8104062 A SE 8104062A SE 8104062 A SE8104062 A SE 8104062A SE 8104062 L SE8104062 L SE 8104062L
Authority
SE
Sweden
Prior art keywords
path
signal
compressor
circuit
frequency
Prior art date
Application number
SE8104062A
Other languages
Unknown language ( )
Swedish (sv)
Other versions
SE450985B (en
Inventor
Ray Milton Dolby
Original Assignee
Ray Milton Dolby
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 Ray Milton Dolby filed Critical Ray Milton Dolby
Publication of SE8104062L publication Critical patent/SE8104062L/en
Publication of SE450985B publication Critical patent/SE450985B/en

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G7/00—Volume compression or expansion in 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

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)
  • Coupling Device And Connection With Printed Circuit (AREA)
  • Measurement And Recording Of Electrical Phenomena And Electrical Characteristics Of The Living Body (AREA)

Abstract

A frequency dependent circuit is located in the main signal path of a dual path compressor or expander in which the main signal path is linear with respect to dynamic range and a further path provides a signal which boosts or bucks the main path by way of a combining circuit, but which is so limited that in the upper part of the input dynamic range the further path signal is smaller than the main path signal. The frequency dependent circuit in the compressor is called an antisaturation network with a characteristic FAS such as to effect a reduction in frequency response in the frequency band affected by overload in a transmission channel fed by the compressor, typically the upper end of the overall frequency band. The expander which is fed by the channel has a complementary antisaturation circuit with a characteristic F'AS providing a complementary increase in frequency response. The arrangement provides level dependent equalization without significantly affecting the noise reduction effect of a compressor/expander system because in dual path compressors and expanders the output of the circuits at very low signal levels is provided mostly by the further path. Thus, at high levels, where channel overload is a problem, the frequency dependent circuit is effective, while at low levels, where it is not desired or needed, the equalization effect is reduced. <IMAGE>
SE8104062A 1980-06-30 1981-06-29 CIRCUIT FOR MODIFYING THE DYNAMIC AREA OF AN INPUT SE450985B (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US16395080A 1980-06-30 1980-06-30
US18077180A 1980-08-22 1980-08-22

Publications (2)

Publication Number Publication Date
SE8104062L true SE8104062L (en) 1981-12-31
SE450985B SE450985B (en) 1987-09-07

Family

ID=26860115

Family Applications (3)

Application Number Title Priority Date Filing Date
SE8104061A SE447524B (en) 1980-06-30 1981-06-29 SIGNAL KOMPRESSOR
SE8104062A SE450985B (en) 1980-06-30 1981-06-29 CIRCUIT FOR MODIFYING THE DYNAMIC AREA OF AN INPUT
SE8104063A SE447525B (en) 1980-06-30 1981-06-29 COMPRESSOR, EXPANDER AND NOISE REDUCTIONS INCLUDING A COMPRESSOR AND EXPANDER

Family Applications Before (1)

Application Number Title Priority Date Filing Date
SE8104061A SE447524B (en) 1980-06-30 1981-06-29 SIGNAL KOMPRESSOR

Family Applications After (1)

Application Number Title Priority Date Filing Date
SE8104063A SE447525B (en) 1980-06-30 1981-06-29 COMPRESSOR, EXPANDER AND NOISE REDUCTIONS INCLUDING A COMPRESSOR AND EXPANDER

Country Status (17)

Country Link
KR (4) KR880000106B1 (en)
AT (3) AT386911B (en)
AU (3) AU546641B2 (en)
BR (3) BR8104158A (en)
CH (3) CH654703A5 (en)
DE (3) DE3125790A1 (en)
DK (3) DK168806B1 (en)
ES (3) ES503493A0 (en)
FI (3) FI79428C (en)
GB (3) GB2079113B (en)
HK (3) HK28385A (en)
IT (3) IT1137985B (en)
MY (3) MY8501149A (en)
NL (3) NL190214C (en)
NO (3) NO157398C (en)
SE (3) SE447524B (en)
SG (3) SG4285G (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4736433A (en) * 1985-06-17 1988-04-05 Dolby Ray Milton Circuit arrangements for modifying dynamic range using action substitution and superposition techniques
US4815068A (en) * 1987-08-07 1989-03-21 Dolby Ray Milton Audio encoder for use with more than one decoder each having different characteristics
US5651028A (en) * 1995-05-09 1997-07-22 Unisys Corporation Data transmission system with a low peak-to-average power ratio based on distorting frequently occuring signals
US5793797A (en) * 1995-05-09 1998-08-11 Unisys Corporation Data transmisson system with a low peak-to-average power ratio based on distorting small amplitude signals
DE10011193B4 (en) * 2000-03-08 2004-02-05 Sennheiser Electronic Gmbh & Co. Kg Compander system with a compressor circuit and an expander circuit

Family Cites Families (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US28426A (en) * 1860-05-22 Shortening tires
US2558002A (en) * 1939-10-24 1951-06-26 Int Standard Electric Corp Volume compression system
US3022473A (en) * 1959-08-18 1962-02-20 Bell Telephone Labor Inc Signal recovery circuits
GB1253031A (en) * 1968-01-10 1971-11-10
US3903485A (en) * 1968-01-10 1975-09-02 Ray Milton Dolby Compressors, expanders and noise reduction systems
US3846719A (en) * 1973-09-13 1974-11-05 Dolby Laboratories Inc Noise reduction systems
USRE28426E (en) * 1968-11-01 1975-05-20 Signal compressors and expanders
US3757254A (en) * 1970-06-05 1973-09-04 Victor Co Ltd N system noise reduction system and apparatus using a compression and expansio
GB1390341A (en) * 1971-03-12 1975-04-09 Dolby Laboratories Inc Signal compressors and expanders
GB1367002A (en) * 1971-04-06 1974-09-18 Victor Company Of Japan Compression and/or expansion system and circuit
US3875537A (en) * 1972-05-02 1975-04-01 Dolby Laboratories Inc Circuits for modifying the dynamic range of an input signal
GB1432763A (en) * 1972-05-02 1976-04-22 Dolby Laboratories Inc Compressors expanders and noise reduction systems
US3934190A (en) * 1972-09-15 1976-01-20 Dolby Laboratories, Inc. Signal compressors and expanders
US3909733A (en) * 1973-05-17 1975-09-30 Dolby Laboratories Inc Dynamic range modifying circuits utilizing variable negative resistance
US3971405A (en) * 1974-07-15 1976-07-27 Parker-Hannifin Corporation Pressure controlled hydrant valve coupler
US3930208A (en) * 1974-08-29 1975-12-30 Northern Electric Co A-C signal processing circuits for compandors
US3902131A (en) * 1974-09-06 1975-08-26 Quadracast Systems Tandem audio dynamic range expander
JPS51127608A (en) * 1975-04-30 1976-11-06 Victor Co Of Japan Ltd Signal transmitting unit
US4061874A (en) * 1976-06-03 1977-12-06 Fricke J P System for reproducing sound information
DE2803751C2 (en) * 1978-01-28 1982-06-09 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Circuit for automatic dynamic compression or expansion
JPS5552971A (en) * 1978-10-16 1980-04-17 Mitsubishi Electric Corp Simulator for radar indicator

Also Published As

Publication number Publication date
MY8501149A (en) 1985-12-31
DE3125790A1 (en) 1982-05-13
NO812216L (en) 1982-01-04
ES503496A0 (en) 1982-04-16
CH654703A5 (en) 1986-02-28
AU7239381A (en) 1982-01-07
DE3125788A1 (en) 1982-05-13
AT386911B (en) 1988-11-10
NL8103124A (en) 1982-01-18
IT8122650A0 (en) 1981-06-30
FI79428C (en) 1989-12-11
AU545125B2 (en) 1985-07-04
GB2079114A (en) 1982-01-13
NO157398B (en) 1987-11-30
BR8104156A (en) 1982-03-16
DE3125790C2 (en) 1992-11-12
GB2079113A (en) 1982-01-13
DE3125788C2 (en) 1992-06-11
DK282581A (en) 1981-12-31
SE450985B (en) 1987-09-07
HK28285A (en) 1985-04-12
FI74368C (en) 1988-01-11
FI812026L (en) 1981-12-31
GB2079112A (en) 1982-01-13
SG4285G (en) 1985-06-14
NL190214B (en) 1993-07-01
ATA291681A (en) 1988-03-15
DK282881A (en) 1981-12-31
NO812217L (en) 1982-01-04
KR830006992A (en) 1983-10-12
FI79428B (en) 1989-08-31
GB2079113B (en) 1984-10-03
NL8103123A (en) 1982-01-18
NO812218L (en) 1982-01-04
DK168806B1 (en) 1994-06-13
GB2079114B (en) 1984-10-03
SE8104063L (en) 1981-12-31
IT1137985B (en) 1986-09-10
SE8104061L (en) 1981-12-31
KR840002492B1 (en) 1984-12-31
ES8204255A1 (en) 1982-04-16
IT1137986B (en) 1986-09-10
NO157398C (en) 1988-03-09
DK172325B1 (en) 1998-03-16
ATA291481A (en) 1987-12-15
NL189988C (en) 1993-09-16
NL192652B (en) 1997-07-01
DK156356B (en) 1989-08-07
CH660653A5 (en) 1987-05-15
KR840002491B1 (en) 1984-12-31
ES8301084A1 (en) 1982-11-01
NO157400B (en) 1987-11-30
HK28485A (en) 1985-04-12
FI74368B (en) 1987-09-30
IT8122651A0 (en) 1981-06-30
AU544888B2 (en) 1985-06-20
ES503497A0 (en) 1982-11-01
AU7236581A (en) 1982-01-07
BR8104158A (en) 1982-03-16
SE447524B (en) 1986-11-17
NL8103122A (en) 1982-01-18
NL190214C (en) 1993-12-01
IT1137987B (en) 1986-09-10
ATA291581A (en) 1983-03-15
AT386304B (en) 1988-08-10
ES8300233A1 (en) 1982-10-01
MY8501147A (en) 1985-12-31
FI76456B (en) 1988-06-30
AT372796B (en) 1983-11-10
SE447525B (en) 1986-11-17
FI812024L (en) 1981-12-31
CH662684A5 (en) 1987-10-15
NL189988B (en) 1993-04-16
ES503493A0 (en) 1982-10-01
HK28385A (en) 1985-04-12
AU7239481A (en) 1982-01-07
SG4385G (en) 1985-06-14
DK156356C (en) 1989-12-27
DE3125789C2 (en) 1984-01-12
KR830006993A (en) 1983-10-12
BR8104157A (en) 1982-03-16
NO157399C (en) 1988-03-09
NO157399B (en) 1987-11-30
MY8501148A (en) 1985-12-31
AU546641B2 (en) 1985-09-12
DE3125789A1 (en) 1982-05-19
FI76456C (en) 1988-10-10
DK282981A (en) 1981-12-31
SG4585G (en) 1985-06-14
FI812025L (en) 1981-12-31
KR880000106B1 (en) 1988-02-23
IT8122652A0 (en) 1981-06-30
NO157400C (en) 1988-03-09
KR880000105B1 (en) 1988-02-23
NL192652C (en) 1997-11-04
GB2079112B (en) 1984-10-03

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