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

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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

CN102436817BActive Publication Date: 2013-10-30SIVANTOS PTE LTD

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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

The method involves providing the audio signal into several frequency channels (31,32). The frequency associated with the fundamental frequency, in the frequency channel (32) is estimated as harmonic (20,30). The harmonics of the audio signal is moved or mapped from a frequency channel (31) in frequency channel (32). An independent claim is included for device for frequency compression of audio signal.

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

Patent Timeline

30 Oct 2013

Publication

CN102436817B

IPC: G10L19/00; H04R27/02

CPC: H04R25/353; H04R2225/43

Inventors: R.鲍姆尔; U.考内格尔