WO1999053615A3 - A device and method for reduction of transients - Google Patents

A device and method for reduction of transients Download PDF

Info

Publication number
WO1999053615A3
WO1999053615A3 PCT/SE1999/000531 SE9900531W WO9953615A3 WO 1999053615 A3 WO1999053615 A3 WO 1999053615A3 SE 9900531 W SE9900531 W SE 9900531W WO 9953615 A3 WO9953615 A3 WO 9953615A3
Authority
WO
WIPO (PCT)
Prior art keywords
transient
detector
signal
frequency bands
reduction
Prior art date
Application number
PCT/SE1999/000531
Other languages
French (fr)
Other versions
WO1999053615A2 (en
Inventor
Anders Gingsjoe
Bo Haakansson
Original Assignee
Anders Gingsjoe
Bo Haakansson
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 Anders Gingsjoe, Bo Haakansson filed Critical Anders Gingsjoe
Priority to AU40657/99A priority Critical patent/AU4065799A/en
Publication of WO1999053615A2 publication Critical patent/WO1999053615A2/en
Publication of WO1999053615A3 publication Critical patent/WO1999053615A3/en

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G5/00—Tone control or bandwidth control in amplifiers
    • H03G5/16—Automatic control
    • H03G5/24—Automatic control in frequency-selective amplifiers
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H21/00—Adaptive networks
    • H03H21/0012—Digital adaptive filters

Landscapes

  • Tone Control, Compression And Expansion, Limiting Amplitude (AREA)
  • Filters That Use Time-Delay Elements (AREA)

Abstract

Device and method for reduction of signal transients, where the signal is divided into frequency bands, the device at least comprising a transient detector (1), a calculating means, means for delaying a signal (2) and an adaptive filter. In the device an input signal (4) is arranged to both the means for delaying a signal (2) and the transient detector (1) via parallel connection, which both are connected to the adaptive filter (3) the output (5) of which is transient reduced. Characterizing is that the detector (1) detects frequency bands with a threshold function, which indicate presence of transient, and it indicates presence of transient if derivative and/or input signal (4) level exceeds predetermined levels. The detector (1) activates, at the indication of a transient in a frequency band, a calculating means for calculation of a set of filter parameters, describing the gain of the frequency bands, for controlling the transient reduction. If the detector (1) detects presence of transient in only one frequency band, the filter parameters accomplishes a total gain to a level determined by the level of the input signal (4). When the detector (1) no longer detects presence of transient the device goes back to the previous set of filter parameters.
PCT/SE1999/000531 1998-04-08 1999-03-31 A device and method for reduction of transients WO1999053615A2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU40657/99A AU4065799A (en) 1998-04-08 1999-03-31 A device and method for reduction of transients

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE9801235A SE9801235L (en) 1998-04-08 1998-04-08 Device and method for reducing transients
SE9801235-4 1998-04-08

Publications (2)

Publication Number Publication Date
WO1999053615A2 WO1999053615A2 (en) 1999-10-21
WO1999053615A3 true WO1999053615A3 (en) 1999-12-02

Family

ID=20410899

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE1999/000531 WO1999053615A2 (en) 1998-04-08 1999-03-31 A device and method for reduction of transients

Country Status (3)

Country Link
AU (1) AU4065799A (en)
SE (1) SE9801235L (en)
WO (1) WO1999053615A2 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007072280A1 (en) * 2005-12-22 2007-06-28 Koninklijke Philips Electronics N.V. A device for and a method of processing audio data
US8929994B2 (en) 2012-08-27 2015-01-06 Med-El Elektromedizinische Geraete Gmbh Reduction of transient sounds in hearing implants
WO2015089059A1 (en) 2013-12-11 2015-06-18 Med-El Elektromedizinische Geraete Gmbh Automatic selection of reduction or enhancement of transient sounds

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2094594A (en) * 1981-01-29 1982-09-15 Rca Corp Apparatus for varying the dynamic range of a signal
EP0336684A2 (en) * 1988-04-08 1989-10-11 Cedar Audio Limited Noise reduction in the playback of recorded sound

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2094594A (en) * 1981-01-29 1982-09-15 Rca Corp Apparatus for varying the dynamic range of a signal
EP0336684A2 (en) * 1988-04-08 1989-10-11 Cedar Audio Limited Noise reduction in the playback of recorded sound

Also Published As

Publication number Publication date
AU4065799A (en) 1999-11-01
SE9801235D0 (en) 1998-04-08
SE9801235L (en) 1999-10-09
WO1999053615A2 (en) 1999-10-21

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