SE9801235D0 - Device and method for reducing transients - Google Patents

Device and method for reducing transients

Info

Publication number
SE9801235D0
SE9801235D0 SE9801235A SE9801235A SE9801235D0 SE 9801235 D0 SE9801235 D0 SE 9801235D0 SE 9801235 A SE9801235 A SE 9801235A SE 9801235 A SE9801235 A SE 9801235A SE 9801235 D0 SE9801235 D0 SE 9801235D0
Authority
SE
Sweden
Prior art keywords
transient
detector
signal
frequency bands
input signal
Prior art date
Application number
SE9801235A
Other languages
Swedish (sv)
Other versions
SE9801235L (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 SE9801235A priority Critical patent/SE9801235L/en
Publication of SE9801235D0 publication Critical patent/SE9801235D0/en
Priority to AU40657/99A priority patent/AU4065799A/en
Priority to PCT/SE1999/000531 priority patent/WO1999053615A2/en
Publication of SE9801235L publication Critical patent/SE9801235L/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.
SE9801235A 1998-04-08 1998-04-08 Device and method for reducing transients SE9801235L (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
SE9801235A SE9801235L (en) 1998-04-08 1998-04-08 Device and method for reducing transients
AU40657/99A AU4065799A (en) 1998-04-08 1999-03-31 A device and method for reduction of transients
PCT/SE1999/000531 WO1999053615A2 (en) 1998-04-08 1999-03-31 A device and method for reduction of transients

Applications Claiming Priority (1)

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

Publications (2)

Publication Number Publication Date
SE9801235D0 true SE9801235D0 (en) 1998-04-08
SE9801235L SE9801235L (en) 1999-10-09

Family

ID=20410899

Family Applications (1)

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

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
PT74105B (en) * 1981-01-29 1983-06-15 Rca Corp Signal expander
GB2218307A (en) * 1988-04-08 1989-11-08 British Library Board Noise reduction in the playback of recorded sound

Also Published As

Publication number Publication date
WO1999053615A3 (en) 1999-12-02
AU4065799A (en) 1999-11-01
SE9801235L (en) 1999-10-09
WO1999053615A2 (en) 1999-10-21

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