IE812951L - Modifying dynamic range - Google Patents

Modifying dynamic range

Info

Publication number
IE812951L
IE812951L IE812951A IE295181A IE812951L IE 812951 L IE812951 L IE 812951L IE 812951 A IE812951 A IE 812951A IE 295181 A IE295181 A IE 295181A IE 812951 L IE812951 L IE 812951L
Authority
IE
Ireland
Prior art keywords
circuits
arrangements
signal
control signal
circuit
Prior art date
Application number
IE812951A
Other versions
IE52495B1 (en
Original Assignee
Dolby Ray Milton
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 US06/325,530 external-priority patent/US4498055A/en
Application filed by Dolby Ray Milton filed Critical Dolby Ray Milton
Publication of IE812951L publication Critical patent/IE812951L/en
Publication of IE52495B1 publication Critical patent/IE52495B1/en

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
    • H03G9/12—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
    • H03G7/00—Volume compression or expansion in amplifiers
    • H03G7/06—Volume compression or expansion in amplifiers having semiconductor devices
    • H03G7/08—Volume compression or expansion in amplifiers having semiconductor devices incorporating negative feedback
    • 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

  • Tone Control, Compression And Expansion, Limiting Amplitude (AREA)
  • Reduction Or Emphasis Of Bandwidth Of Signals (AREA)
  • Ultra Sonic Daignosis Equipment (AREA)

Abstract

The susceptibility of compressors, expanders and noise reduction circuits to undue control by signals outside the passband(s) in which the circuits are active is reduced. In a compressor which operates by narrowing the pass-band of a variable filter 22, the conventional feedback control via rectifier 31 and smoothing means 31, 32a, 32b is counteracted by a further signal derived from a wider frequency region by a rectifier 31' and smoothing circuit 32a'. The further signal bucks the main control signal in combining circuit 33. Similar arrangements are disclosed for arrangements using variable gain circuits instead of a variable filter and alternative arrangements use multichannel control signal circuits having limiters with different thresholds whereby the control signal is tailored to achieve like results. All arrangements reduce the circuit response to signal components outside the pass band(s) at high input signal levels. <IMAGE> [GB2111355A]
IE2951/81A 1981-12-01 1981-12-15 Improvements in circuit arrangements for modifying dynamic range IE52495B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US06/325,530 US4498055A (en) 1981-09-10 1981-12-01 Circuit arrangements for modifying dynamic range

Publications (2)

Publication Number Publication Date
IE812951L true IE812951L (en) 1983-06-01
IE52495B1 IE52495B1 (en) 1987-11-25

Family

ID=23268273

Family Applications (1)

Application Number Title Priority Date Filing Date
IE2951/81A IE52495B1 (en) 1981-12-01 1981-12-15 Improvements in circuit arrangements for modifying dynamic range

Country Status (15)

Country Link
KR (1) KR900000483B1 (en)
BE (1) BE901906Q (en)
CA (1) CA1188996A (en)
CH (1) CH656996A5 (en)
DE (1) DE3151137A1 (en)
DK (1) DK575681A (en)
ES (1) ES508394A0 (en)
FR (1) FR2517496B1 (en)
GB (1) GB2111355B (en)
GR (1) GR77317B (en)
IE (1) IE52495B1 (en)
IT (1) IT1140402B (en)
LU (1) LU83854A1 (en)
NL (1) NL192860C (en)
SE (1) SE449281B (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4922535A (en) * 1986-03-03 1990-05-01 Dolby Ray Milton Transient control aspects of circuit arrangements for altering the dynamic range of audio signals
CA1269138A (en) * 1986-03-03 1990-05-15 Ray Milton Dolby Attenuator circuit employing bootstrapping
KR960014115B1 (en) * 1986-03-03 1996-10-14 밀톤 돌비 레이 Attanuator using bootstrapping
GB2429779A (en) * 2005-09-01 2007-03-07 Geo Kingsbury Machine Tools Lt Testing components of drive trains

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1120541A (en) * 1965-08-11 1968-07-17 Dolby Ray Milton Improvements in noise reduction systems
US3665345A (en) * 1969-07-21 1972-05-23 Dolby Laboratories Inc Compressors and expanders for noise reduction systems
FI57502C (en) * 1971-04-06 1980-08-11 Victor Company Of Japan KOMPRESSIONS- OCH EXPANSIONSSYSTEM
US4101849A (en) * 1976-11-08 1978-07-18 Dbx, Inc. Adaptive filter
BE889428A (en) * 1980-06-30 1981-10-16 Dolby Ray Milton DEVICE FOR MODIFYING THE DYNAMIC RANGE OF INPUT SIGNALS

Also Published As

Publication number Publication date
KR830008462A (en) 1983-11-18
GB2111355B (en) 1985-02-13
IT1140402B (en) 1986-09-24
CA1188996A (en) 1985-06-18
ES8303848A1 (en) 1983-02-01
LU83854A1 (en) 1982-05-07
KR900000483B1 (en) 1990-01-30
ES508394A0 (en) 1983-02-01
DE3151137C2 (en) 1993-04-01
IE52495B1 (en) 1987-11-25
FR2517496A1 (en) 1983-06-03
NL8105775A (en) 1983-07-01
CH656996A5 (en) 1986-07-31
NL192860B (en) 1997-11-03
NL192860C (en) 1998-03-04
GR77317B (en) 1984-09-11
DK575681A (en) 1983-06-02
GB2111355A (en) 1983-06-29
SE449281B (en) 1987-04-13
SE8107495L (en) 1983-06-02
BE901906Q (en) 1985-07-01
FR2517496B1 (en) 1985-11-15
DE3151137A1 (en) 1983-07-14
IT8125877A0 (en) 1981-12-29

Similar Documents

Publication Publication Date Title
US4135590A (en) Noise suppressor system
EP0340974A3 (en) Active acoustic attenuation system with differential filtering
US4494551A (en) Alterable frequency response electrocardiographic amplifier
US5481617A (en) Loudspeaker arrangement with frequency dependent amplitude regulation
EP0328346A3 (en) Noise reduction circuits
CA2067562A1 (en) Frequency doubler with a variable delay circuit and exclusive or gate
CA2047398A1 (en) Luminance signal noise suppressor
IE812951L (en) Modifying dynamic range
US4899389A (en) Pulsating noise removal device
US5369794A (en) Adaptive oscillator frequency feedthrough cancellation in mixer circuit
KR830006993A (en) Circuit arrangement to reduce the fluctuation range
EP0379210A3 (en) Apparatus for reducing noise in high-frequency band
JPH0337771B2 (en)
SU1042158A1 (en) Dynamic filter
JPH04326294A (en) Frequency band dividing device
JPS6246348Y2 (en)
JPS57155842A (en) Noise reduction circuit
SU690613A1 (en) Controllable filter
JPS54157018A (en) Fm receiver
JPS5742240A (en) Squeltch circuit
JPS6141232A (en) Fm receiver
JPS61278217A (en) Fm stereo receiver
JPS5644289A (en) Signal receiver
JPS5443448A (en) Compressor
JPS6142902B2 (en)

Legal Events

Date Code Title Description
MK9A Patent expired