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Method and device for frequency compression with harmonic correction

A technology of frequency compression and harmonics, applied in speech analysis, instruments, electrical components, etc., can solve problems such as damage and no longer guaranteed spectrum lines

Active Publication Date: 2012-05-02
SIVANTOS PTE LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The raster (line-column structure Linienstruktur) of the harmonic signal is not taken into account in the simple mapping specification according to the prior art and is therefore destroyed, ie the spectral lines are no longer guaranteed to occur at integer multiples of the fundamental frequency of speech

Method used

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  • Method and device for frequency compression with harmonic correction
  • Method and device for frequency compression with harmonic correction
  • Method and device for frequency compression with harmonic correction

Examples

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Embodiment Construction

[0034] The examples described in detail below represent preferred embodiments of the invention.

[0035] However, in order to better understand the present invention, first according to image 3 The frequency compression according to the prior art is shown in detail. Accordingly, frequencies are compressed according to a frequency mapping curve (eg, SPINC, BARK, etc.). The starting point is for example image 3 A line spectrum (Linienspektrum) as shown in the upper part. The amplitude response α is plotted with respect to frequency f. This line spectrum has a large number of harmonics 20 which form a fine structure of the frequency spectrum of the harmonic signal. The amplitudes of these harmonics 20 can be connected by an envelope 21 of the frequency spectrum. The interval f between two harmonics 20 0 corresponds to the fundamental frequency in the entire spectral range. should now compress above frequencies f c spectrum. This compression is done channel by channel b...

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Abstract

Artifacts occurring during frequency compression, in particular in the case of hearing aids, are avoided or reduced. The method comprises the frequency of an audio signal having a fundamental frequency and at least one harmonic (30). The audio signal is provided in a plurality of frequency channels (31, 32). The harmonic of the audio signal is shifted or mapped (33) from a first frequency channel (31) of the plurality of frequency channels into a second frequency channel (32). In addition a frequency which is likewise harmonic with respect to the fundamental frequency is estimated in the second frequency channel, the harmonic being shifted or mapped onto the estimated frequency. As a result the harmonic pattern is preserved in the compressed signal and the artifacts are reduced.

Description

technical field [0001] The invention relates to a method of frequency compression of an audio signal comprising a fundamental frequency and at least one harmonic by providing the audio signal into a plurality of frequency channels and converting the harmonics of the audio signal from said plurality of frequencies This is achieved by shifting or mapping a first frequency channel of a channel to a second frequency channel of a plurality of frequency channels. Furthermore, the invention relates to a corresponding device for frequency compression. In particular such devices can be used in hearing aids. A hearing device is here understood to be any sound output device which can be worn in or on the ear, in particular hearing aids, headsets, headphones and other such devices. Background technique [0002] Hearing aids are portable hearing aids used to provide hearing assistance to hard of hearing people. To meet a large number of individual needs, hearing aids are available in ...

Claims

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Application Information

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IPC IPC(8): G10L19/00H04R27/02
CPCH04R2225/43H04R25/353
Inventor R.鲍姆尔U.考内格尔T.皮尔格里姆
Owner SIVANTOS PTE LTD
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