Scalable encoding/decoding of audio signals

An audio signal encoding and audio signal technology, applied in the field of audio signal encoding and/or decoding, can solve problems such as inflexibility, achieve compatibility, improve backward compatibility, and facilitate the introduction of new encoders/decoders Effect

Active Publication Date: 2008-01-09
KONINKLIJKE PHILIPS ELECTRONICS NV
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AI Technical Summary

Problems solved by technology

Furthermore, the described method is impractical for recently introduced coding devices employing parametric coding techniques such as SBR and parametric stereo, since in such cases the residual signal still prohibits high entropy value and therefore require a high bit rate for encoding
Furthermore, the system is relatively inflexible and tends to provide only limited scalability

Method used

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  • Scalable encoding/decoding of audio signals
  • Scalable encoding/decoding of audio signals
  • Scalable encoding/decoding of audio signals

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Embodiment Construction

[0081] The following description focuses on an embodiment of the invention compatible with audio coding according to the MPEG-4 standard. However, it should be understood that the invention is not limited to this application, but can be applied to many other encoding / decoding standards or techniques.

[0082] Figure 1 illustrates an encoder 100 according to some embodiments of the invention.

[0083] The encoder 100 comprises an encoding receiver 101 which receives an audio signal for encoding. The audio signal may be received from any suitable internal or external source, and may eg be in the form of a digital mono audio signal having pulse code modulated (PCM) samples. The coded receiver 101 is coupled to a first waveform coder 103, to which a digitized audio signal is fed.

[0084] A first waveform encoder encodes the audio signal to generate a first waveform-based bitstream component. In particular, the first waveform encoder 103 may use a waveform encoding technique wi...

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Abstract

An audio signal is encoded by a first waveform encoder (103) to generate a first waveform based bit-stream component. A second encoder (105) encodes the audio signal to generate a second bit-stream component comprising first enhancement data and a third encoder (107) encodes the audio signal to generate a third bit-stream component comprising second enhancement data for the first waveform based bit-stream component. The first and second bit-stream components correspond to a first representation of the audio signal and the first and third bit-stream components correspond to a second representation of the audio signal. A scalable audio bit-stream is generated by a bit-stream generator (109). The different representations may be selected between by a decoder thereby allowing a flexible and scalable bit-stream to be communicated. The second encoder (105) may specifically be a waveform encoder and the third encoder (107) may specifically be a parametric encoder.

Description

technical field [0001] The present invention relates to encoding and / or decoding of audio signals, in particular to scalable representations of audio signals. Background technique [0002] Digital encoding of various source signals has become increasingly important over the past decade as digital signal representation and communication has gradually replaced analog representation and communication. For example, mobile telephone systems such as Global System for Mobile Communications are based on digital speech coding. The distribution of media content such as video and music is also increasingly based on digital content encoding. [0003] In the context of audio and video coding, scalability of the encoded signal is advantageous and provides flexible distribution and processing of the encoded signal. For example, encoded signals can be scaled in terms of quality, bit rate, and complexity. A specific example of video coding is the progressive quality of JPEG (Joint Photogr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10L19/14G10L19/24
CPCG10L19/24
Inventor A·W·J·乌门L·M·范德柯克霍夫
Owner KONINKLIJKE PHILIPS ELECTRONICS NV
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