DK143150C - Signalkompressor eller -ekspander til audiostoejreduktion - Google Patents

Signalkompressor eller -ekspander til audiostoejreduktion

Info

Publication number
DK143150C
DK143150C DK576769A DK576769A DK143150C DK 143150 C DK143150 C DK 143150C DK 576769 A DK576769 A DK 576769A DK 576769 A DK576769 A DK 576769A DK 143150 C DK143150 C DK 143150C
Authority
DK
Denmark
Prior art keywords
expands
noise reduction
audio noise
signal compressor
compressor
Prior art date
Application number
DK576769A
Other languages
English (en)
Other versions
DK143150B (da
Inventor
R M 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
Priority to DK55580A priority Critical patent/DK55580A/da
Publication of DK143150B publication Critical patent/DK143150B/da
Application granted granted Critical
Publication of DK143150C publication Critical patent/DK143150C/da

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)
  • 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)
  • Treatment Of Steel In Its Molten State (AREA)
DK576769A 1968-11-01 1969-10-31 Signalkompressor eller -ekspander til audiostoejreduktion DK143150C (da)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DK55580A DK55580A (da) 1968-11-01 1980-02-08 Fremgangsmaade til audiostoejreduktion

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
GB5198568 1968-11-01
GB3646669A GB1279634A (en) 1968-11-01 1968-11-01 Signal compressors and expanders
GB5198568 1968-11-01
GB3646669 1969-07-21

Publications (2)

Publication Number Publication Date
DK143150B DK143150B (da) 1981-06-29
DK143150C true DK143150C (da) 1981-11-09

Family

ID=26263128

Family Applications (1)

Application Number Title Priority Date Filing Date
DK576769A DK143150C (da) 1968-11-01 1969-10-31 Signalkompressor eller -ekspander til audiostoejreduktion

Country Status (11)

Country Link
US (1) US3631365A (da)
JP (1) JPS5148008B1 (da)
AT (1) AT294920B (da)
BE (1) BE740914A (da)
CH (1) CH508312A (da)
DE (1) DE1954328B2 (da)
DK (1) DK143150C (da)
FR (1) FR2022422A1 (da)
NL (1) NL163078C (da)
NO (1) NO127166B (da)
SE (1) SE346189B (da)

Families Citing this family (32)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3789143A (en) * 1971-03-29 1974-01-29 D Blackmer Compander with control signal logarithmically related to the instantaneous rms value of the input signal
NL163388C (nl) * 1971-05-04 1980-08-15 Philips Nv Ruisonderdrukkingsschakeling.
US3732371A (en) * 1971-05-10 1973-05-08 Richard S Burwen Wide dynamic range noise masking compandor
US3911371A (en) * 1971-07-24 1975-10-07 Sony Corp Signal transmission system
US3729693A (en) * 1971-08-02 1973-04-24 R Dolby Compressor/expander switching methods and apparatus
GB1401336A (en) * 1971-10-05 1975-07-16 Victor Company Of Japan Expander circuit for a compression and expansion system
JPS52661B2 (da) * 1972-01-11 1977-01-10
JPS5648884B2 (da) * 1972-03-07 1981-11-18
GB1432763A (en) * 1972-05-02 1976-04-22 Dolby Laboratories Inc Compressors expanders and noise reduction systems
GB1438711A (en) * 1973-01-23 1976-06-09 Dolby Laboratories Inc Calibration oscillators for noise reduction systems
US3909733A (en) * 1973-05-17 1975-09-30 Dolby Laboratories Inc Dynamic range modifying circuits utilizing variable negative resistance
US3875334A (en) * 1973-06-19 1975-04-01 Motorola Inc Multi-channel control circuit with D-C operated control devices
US4169219A (en) * 1977-03-30 1979-09-25 Beard Terry D Compander noise reduction method and apparatus
JPS5439516A (en) * 1977-09-02 1979-03-27 Sanyo Electric Co Ltd Noise reduction unit
DE2744249B2 (de) * 1977-10-01 1980-01-31 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Schaltungsanordnung zur wahlweisen Dynamik-Kompression oder -Expansion
US4514701A (en) * 1978-12-05 1985-04-30 Kenji Machida Automatic level control circuit
JPS55156431A (en) * 1979-05-24 1980-12-05 Sony Corp Noise reduction system
JPS5791320U (da) * 1980-11-26 1982-06-05
US4388654A (en) * 1981-03-17 1983-06-14 Rca Corporation Video disc player with selectively enabled audio signal expander circuitry
US4586191A (en) * 1981-08-19 1986-04-29 Sanyo Electric Co., Ltd. Sound signal processing apparatus
CA1188384A (en) * 1981-12-29 1985-06-04 Masayuki Katakura Noise reduction circuit
JPS58209234A (ja) * 1982-05-29 1983-12-06 Sony Corp ノイズリダクシヨン回路
US4696044A (en) * 1986-09-29 1987-09-22 Waller Jr James K Dynamic noise reduction with logarithmic control
US5371803A (en) * 1990-08-31 1994-12-06 Bellsouth Corporation Tone reduction circuit for headsets
US5278912A (en) * 1991-06-28 1994-01-11 Resound Corporation Multiband programmable compression system
KR950002066B1 (ko) * 1992-12-23 1995-03-10 삼성전자주식회사 신호 잡음 감쇄장치
US5748763A (en) * 1993-11-18 1998-05-05 Digimarc Corporation Image steganography system featuring perceptually adaptive and globally scalable signal embedding
US5701352A (en) * 1994-07-14 1997-12-23 Bellsouth Corporation Tone suppression automatic gain control for a headset
WO1997004535A1 (fr) * 1995-07-24 1997-02-06 Gennady Alexandrovich Pavlov Dispositif dynamique de suppression du bruit de type compresseur-extenseur
US6795740B1 (en) 2000-03-01 2004-09-21 Apple Computer, Inc. Rectifying overflow and underflow in equalized audio waveforms
US9886939B2 (en) 2017-06-20 2018-02-06 Signal/Noise Solutions, L.L.C. Systems and methods for enhancing a signal-to-noise ratio
US10388265B2 (en) 2017-06-20 2019-08-20 Signal/Noise Solutions L.L.C. Systems and methods for enhancing a signal-to-noise ratio

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3111635A (en) * 1960-05-05 1963-11-19 Fairchild Recording Equipment Method and apparatus for eliminating overloading in modulating systems having pre-emphasis means
NL293818A (da) * 1962-06-07
US3397285A (en) * 1964-07-22 1968-08-13 Motorola Inc Electronic apparatus
US3379839A (en) * 1964-12-07 1968-04-23 Cons Electrodynamics Corp Magnetic recording dynamic range compressor/expander system

Also Published As

Publication number Publication date
FR2022422A1 (da) 1970-07-31
NO127166B (da) 1973-05-14
NL6916490A (da) 1970-05-06
AT294920B (de) 1971-12-10
BE740914A (da) 1970-04-01
CH508312A (de) 1971-05-31
JPS5148008B1 (da) 1976-12-18
NL163078C (nl) 1980-07-15
DE1954328B2 (de) 1975-10-02
SE346189B (da) 1972-06-26
US3631365A (en) 1971-12-28
DK143150B (da) 1981-06-29
DE1954328A1 (de) 1970-06-11

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Legal Events

Date Code Title Description
PUP Patent expired