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Resampling of an audio signal by interpolation for low-delay encoding/decoding

An audio signal encoding, audio signal technology, applied in the field of audio signal processing for transmission or storage, can solve problems such as high complexity

Active Publication Date: 2017-02-22
ORANGE SA
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is known from prior art that interpolating "splines" generally achieves better performance levels, but at the cost of higher complexity

Method used

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  • Resampling of an audio signal by interpolation for low-delay encoding/decoding
  • Resampling of an audio signal by interpolation for low-delay encoding/decoding
  • Resampling of an audio signal by interpolation for low-delay encoding/decoding

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Embodiment Construction

[0098] Figure 7 Therefore, the main steps of the resampling method according to the embodiment of the present invention are shown.

[0099] The steps of this method are to use the input sampling frequency f enter Audio signal on (as input (x enter )). As reference later Figure 8 with Picture 10 As described, such an input signal may be, for example, a signal vector of short length contained in the resample filter memory.

[0100] In the embodiment described here, a third-order cubic curve type interpolation method is used. Of course, different interpolation orders can be used, however, the order is greater than one.

[0101] In step E701, cubic interpolation is used not only on the central interval but also on 3 intervals:

[0102] -The right interval of the previous cubic curve (interval [1, 2]),

[0103] -The central interval of the central cubic curve (interval [0, 1]) and

[0104] -The left interval (interval [-1, 0]) of the next cubic curve used to interpolate the value at tim...

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Abstract

The invention relates to a method for resampling an audio-frequency signal in an audio-frequency signal encoding or decoding operation, the resampling being carried out by a method of interpolation of an order greater than one. The method is such that the interpolated samples are obtained (E702) by calculating a weighted average of possible interpolation values (E701) calculated over a plurality of intervals covering the time location of the sample to be interpolated. The invention also relates to a resampling device implementing the described method, and an encoder and decoder comprising at least one device.

Description

Technical field [0001] The present invention relates to processing audio signals for transmission or storage. More specifically, the present invention relates to the change of sampling frequency when encoding or decoding an audio signal. Background technique [0002] There are many techniques for compressing (lossy) audio signals (such as speech or music). Encoding can be performed directly on the sampling frequency of the input signal, as for example in the ITU-T recommendation G.711 or G.729, where the input signal is sampled at 8kHz, and the encoder and decoder are the same here Operate on frequency. [0003] However, some encoding methods use changes in sampling frequency to reduce the complexity of encoding, adapt the encoding according to different frequency subbands to be encoded, or convert the input signal to match the encoder's predefined internal sampling The frequency corresponds. [0004] In the subband coding defined in the ITU-T recommendation G.722, the 16kHz inpu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/17G10L21/00H03H17/02
CPCG06F17/17G10L21/00H03H17/028G06F17/11G10L19/0204G10L19/24G10L19/26
Inventor B.科韦西S.拉戈
Owner ORANGE SA
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