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Method for compression the dynamics in an audio signal

An audio signal, dynamic technology, applied in volume compression/expansion, hearing aid signal processing, volume compression/expansion in non-tuning/low-frequency amplifiers, etc., can solve problems such as reducing gain and feeling uncomfortable loud

Inactive Publication Date: 2017-01-04
SIVANTOS PTE LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For large input levels, however, the gain must be reduced, since the amplified hearing signal is perceived as uncomfortably loud

Method used

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  • Method for compression the dynamics in an audio signal
  • Method for compression the dynamics in an audio signal
  • Method for compression the dynamics in an audio signal

Examples

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Embodiment Construction

[0028] figure 1 The flow of method 1 is schematically shown in a block diagram. The microphone 2 receives an audio signal 6 from the ambient sound 4 , which is formed by a speech signal (not shown in detail), which is overlaid by hum or noise. Alternatively, the audio signal 6 is presented as a signal fed directly from an audio source, for example as a musical signal, where useful signals (eg signals of individual instruments or voices of performers) are in turn covered by background noise. Audio signal 6 is split into a plurality of frequency bands 10 in filter bank 8 . In each individual frequency band 10 , the input level 12 of the signal component 14 of the audio signal 6 in the frequency band 10 is measured in each case. The input level 12 of the signal component 14 is compared with a limit value 16 specified specifically for the frequency band 10 , wherein a time constant t1 is provided for the course of the comparison. If the input level 12 averaged with respect to t...

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Abstract

A method for compressing the dynamics in an audio signal includes measuring at least one input level of the audio signal and comparing the measured input level with a limit value. A prescribed compression characteristic having a knee defined by a base value of the input level is adjusted to suit the audio signal by raising the knee from the base value to a higher target value if the at least one input level exceeds the limit value. The audio signal is compressed in accordance with the adjusted compression characteristic. A signal processing unit includes a signal input for feeding in an audio signal and is configured to perform the method, and a hearing device includes at least one microphone for obtaining an audio signal from an ambient sound and the signal processing unit connected to the microphone.

Description

technical field [0001] The invention relates to a method for compressing dynamics in an audio signal, eg obtained from ambient sound or fed by an audio source. The audio signal is here the signal from which the hearing signal for the user is generated. Background technique [0002] In the signal processing of audio signals, the compression of dynamics generally represents an important aid in being able to properly represent sound signals with large level differences and thus large dynamic ranges. Large differences in the levels of the audio signal to be recorded and the audio signal to be processed can result in a purely linear amplification of the audio signal that, when an amplification factor is selected too high, the signal component with the largest level amplitude is lost in the signal processing. Overshoots can sometimes result, or signal components with low signal levels do not feed satisfactorily, in particular not sufficiently audible, into the processed output si...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04R25/00G10L19/00G10L21/02G10L21/0208
CPCG10L19/00G10L21/02G10L21/0208H04R25/00H04R25/453H03G7/00H03G9/025H04R25/356H04R2225/43H03G7/002H04R25/505
Inventor S.佩特劳施U.吉斯S.佩普
Owner SIVANTOS PTE LTD
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