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Low bit-rate audio encoding

An audio stream, frequency technology, used in speech analysis, instruments, etc.

Inactive Publication Date: 2010-06-16
KONINK PHILIPS ELECTRONICS NV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Oscillations in the estimated frequency may be audible, which is not desired

Method used

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  • Low bit-rate audio encoding
  • Low bit-rate audio encoding
  • Low bit-rate audio encoding

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Embodiment Construction

[0030] Now, preferred embodiments of the present invention will be described with reference to the accompanying drawings, in which the same constituent elements are denoted by the same reference numerals and perform the same functions unless otherwise specified. In a preferred embodiment of the invention, the encoder 1 is a sinusoidal encoder of the type described in WO 01 / 69593, FIG. The operation of this prior art encoder and its corresponding decoder has been fully explained, and only the explanation related to the present invention is provided here.

[0031] In the prior art and the preferred embodiment of the present invention, the audio encoder 1 samples the input audio signal at a certain sampling frequency to obtain the digital representation x(t) of the audio signal. Then, the encoder 1 divides the sampled input signal into three components: a transient signal component, a continuous deterministic component, and a continuous random component. The audio encoder 1 include...

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Abstract

In a sinusoidal audio encoder a number of sinusoids are estimated per audio segment. A sinusoid is represented by frequency, amplitude and phase. The invention uses a track dependent quantization of phase. A track is encoded with a suitable initial (e.g. frequency dependent) quantization grid that is chosen among a set of possible initial grids that may vary from fine to coarse. If, in a series oftime segments the frequency variation in a particular track is smaller than a predetermined value, the track is quantized using a finer quantization grid. The invention gives a significant improvement in decoded signal quality, especially for low bit-rate quantizers.

Description

Technical field [0001] The present invention relates to the encoding and decoding of wideband signals, and more specifically, the present invention relates to the encoding and decoding of audio signals. The present invention relates to an encoder and a decoder, and also relates to an audio stream encoded according to the present invention and a data storage medium on which such an audio stream is stored. Background technique [0002] When transmitting wideband signals such as audio signals such as speech, compression or coding techniques are used to reduce the bandwidth or bit rate of the signal. [0003] Figure 1 shows a known parameter encoding scheme, in particular, the sinusoidal encoder used in the present invention and described in WO 01 / 69593. In this encoder, the input audio signal x(t) is divided into several (possibly overlapping) time periods or frames, usually each having a duration of 20ms (milliseconds). Each segment is decomposed into transient sinusoidal and noise...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G10L19/08G10L19/093
CPCG10L19/093G10L19/02G10L21/02
Inventor G·H·霍托A·J·格里特斯
Owner KONINK PHILIPS ELECTRONICS NV