SE8604615D0 - DEVICE FOR ELIMINATION OF NOISE AND / OR NOISE IN A SIGNAL - Google Patents

DEVICE FOR ELIMINATION OF NOISE AND / OR NOISE IN A SIGNAL

Info

Publication number
SE8604615D0
SE8604615D0 SE8604615A SE8604615A SE8604615D0 SE 8604615 D0 SE8604615 D0 SE 8604615D0 SE 8604615 A SE8604615 A SE 8604615A SE 8604615 A SE8604615 A SE 8604615A SE 8604615 D0 SE8604615 D0 SE 8604615D0
Authority
SE
Sweden
Prior art keywords
signal
circuit
value
input
amplitude
Prior art date
Application number
SE8604615A
Other languages
Swedish (sv)
Other versions
SE452213B (en
Inventor
Jiri Klokocka
Original Assignee
Jiri Klokocka
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 Jiri Klokocka filed Critical Jiri Klokocka
Priority to SE8604615A priority Critical patent/SE452213B/en
Publication of SE8604615D0 publication Critical patent/SE8604615D0/en
Priority to PCT/SE1987/000495 priority patent/WO1988003306A1/en
Publication of SE452213B publication Critical patent/SE452213B/en

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B15/00—Suppression or limitation of noise or interference
    • H04B15/005—Reducing noise, e.g. humm, from the supply
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10H—ELECTROPHONIC MUSICAL INSTRUMENTS; INSTRUMENTS IN WHICH THE TONES ARE GENERATED BY ELECTROMECHANICAL MEANS OR ELECTRONIC GENERATORS, OR IN WHICH THE TONES ARE SYNTHESISED FROM A DATA STORE
    • G10H1/00—Details of electrophonic musical instruments
    • G10H1/02—Means for controlling the tone frequencies, e.g. attack or decay; Means for producing special musical effects, e.g. vibratos or glissandos
    • G10H1/06—Circuits for establishing the harmonic content of tones, or other arrangements for changing the tone colour
    • G10H1/12—Circuits for establishing the harmonic content of tones, or other arrangements for changing the tone colour by filtering complex waveforms
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/24—Signal processing not specific to the method of recording or reproducing; Circuits therefor for reducing noise

Abstract

An apparatus for eliminating noise/hum in a signal includes an attenuating circuit (13) connected between a signal input (11) and a signal output (12), and further includes a linear filter circuit (15) and a detector (14) connected in series between the signal input and a control input (131) of the attenuating circuit. The filter circuit (15) has a variable time constant (t) having a minimum value (t1) when the amplitude of the input signal reaches to at least a given pre-determined level (A1), having a maximum value (t2) when the amplitude of the input signal lies between the given level (A1) and a threshold value (A2) which is lower than the given value (A1), and has a value (t3) between the maximum value and the minimum value when the amplitude of the input signal at most reaches the threshold value (A2). The detector (14) treats the input signal as a signal of constant amplitude and the attenuating circuit (13) comprises a series-coupling consisting of a delay circuit (132), having a delay of 0.1 ms - 10 ms, and an attenuating circuit (133). The filter circuit (15) includes a plurality of series-connected low pass filters (90, 91, 92; 94; 96, 97, 98).
SE8604615A 1986-10-29 1986-10-29 DEVICE FOR ELIMINATION OF NOISE AND / OR NOISE IN A SIGNAL SE452213B (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
SE8604615A SE452213B (en) 1986-10-29 1986-10-29 DEVICE FOR ELIMINATION OF NOISE AND / OR NOISE IN A SIGNAL
PCT/SE1987/000495 WO1988003306A1 (en) 1986-10-29 1987-10-26 Apparatus for eliminating noise and/or hum in a signal

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE8604615A SE452213B (en) 1986-10-29 1986-10-29 DEVICE FOR ELIMINATION OF NOISE AND / OR NOISE IN A SIGNAL

Publications (2)

Publication Number Publication Date
SE8604615D0 true SE8604615D0 (en) 1986-10-29
SE452213B SE452213B (en) 1987-11-16

Family

ID=20366113

Family Applications (1)

Application Number Title Priority Date Filing Date
SE8604615A SE452213B (en) 1986-10-29 1986-10-29 DEVICE FOR ELIMINATION OF NOISE AND / OR NOISE IN A SIGNAL

Country Status (2)

Country Link
SE (1) SE452213B (en)
WO (1) WO1988003306A1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4899389A (en) * 1987-02-17 1990-02-06 Clarion Co., Ltd. Pulsating noise removal device
US4914398A (en) * 1988-08-01 1990-04-03 International Business Machines Corporation Method and circuitry to suppress additive disturbances in data channels containing MR sensors
TWI343206B (en) 2006-10-12 2011-06-01 Novatek Microelectronics Corp Noise estimator device of a video decoder and related method

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4306695A (en) * 1979-07-09 1981-12-22 American Standard Inc. Non-linear filter

Also Published As

Publication number Publication date
SE452213B (en) 1987-11-16
WO1988003306A1 (en) 1988-05-05

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