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Audio coding and decoding

An audio coding and audio decoding technology, which is applied in the field of audio coding and decoding, can solve the problems of auditory signal distortion and coding error at the decoder

Inactive Publication Date: 2008-04-23
KONINKLIJKE PHILIPS ELECTRONICS NV +1
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Problems solved by technology

Applying a noise model to this residual signal thus introduces further coding errors, resulting in distortion of the auditory signal at the decoder

Method used

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Embodiment Construction

[0038] figure 1 The transmission system shown in FIG. 2 is only shown as a non-limiting example, including an audio encoding device 100' and an audio decoding device 200'. The prior art audio encoding device 100', also called a "parametric audio encoder", encodes the audio signal x(n) in three stages. An audio transmission system of this type is disclosed in the above-mentioned US Patent Application No. US 2001 / 0032087.

[0039] In the first stage, any transient signal components of the audio signal x(n) are encoded using a transient parameter extraction (TPE) unit 101 . The parameters are supplied to the combining and multiplexing (C&M) unit 150 and the transient synthesis (TS) unit 102 . When the combining and multiplexing unit 150 combines and multiplexes the parameters appropriately for transmission to the decoder 200', the transient synthesis unit 102 reconstructs the decoded transient. These reconstructed transients are subtracted from the original audio signal x...

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Abstract

An audio encoding device (100) comprises first encoding means (101, 111) for encoding transient signal components and / or sinusoidal signal components of an audio signal (x(n)) and producing a residual signal (z(n)), and second encoding means for encoding the residual signal. The second encoding means comprise filter means (122) for selecting at least two frequency bands of the residual signal. The selected frequency bands (LF, HF) of the residual signal (z(n)) are encoded by a first encoding unit (123) and a second encoding unit (124) respectively. The first encoding unit (123) may comprise a waveform encoder, such as a time-domain encoder, while the second encoding unit (124) may comprise a noise encoder.

Description

technical field [0001] The present invention relates to audio encoding and decoding. More specifically, the invention relates to an audio encoding device comprising first encoding means for encoding a transient signal component and / or a sinusoidal signal component of an audio signal and generating a residual signal, and second encoding means for encoding the residual signal. Two encoding devices. The invention also relates to an audio decoding device, a method of encoding an audio signal, and a method of decoding an audio signal. Background technique [0002] It is well known to encode audio signals to reduce the bandwidth required to transmit or store the signals. Various coding techniques are currently used, most of which are suitable for specific classes of signals. Different encoding techniques can be applied consecutively to the same signal, effectively encoding different signal components. For example, a transient signal component of an audio signal is encoded, and...

Claims

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Application Information

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IPC IPC(8): G10L19/08G10L19/02G10L19/16
CPCG10L19/08G10L19/0204G10L19/16G10L19/00H03M7/30
Inventor A·C·登布林克F·里拉帕劳A·W·J·乌门J·-B·H·M·罗尔特D·S·T·威雷特P·J·-L·M·菲利普
Owner KONINKLIJKE PHILIPS ELECTRONICS NV
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