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Fidelity-optimised variable frame length encoding

A technology for encoding and encoding frames, applied in the field of multi-channel audio signal encoding, can solve the problem that stereo or multi-channel encoding cannot be applied, and achieve the effect of improving preservation

Active Publication Date: 2009-11-11
TELEFON AB LM ERICSSON (PUBL)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this technique requires the separation of different source signals and thus cannot usually be applied to stereo or multi-channel encoding

Method used

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  • Fidelity-optimised variable frame length encoding
  • Fidelity-optimised variable frame length encoding
  • Fidelity-optimised variable frame length encoding

Examples

Experimental program
Comparison scheme
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Embodiment Construction

[0036] figure 1 A typical system 1 is illustrated in which the invention can be used to advantage. The transmitter 10 comprises an antenna 12 including the associated hardware and software to be able to transmit a radio signal 5 to a receiver 20 . Transmitter 10 includes, among other things, a multi-channel encoder 14 that transforms signals of a plurality of input channels 16 into output signals suitable for radio transmission. Examples of suitable multi-channel encoders 14 are described in further detail below. The input channel 16 signal may be provided from eg an audio signal memory 18, eg a data file of a digital representation of an audio recording, a magnetic tape or an audio polyethylene disc or the like. The input channel 16 signal may also be provided "live", for example from a set of microphones 19 . If the audio signal is not already in digital format, it is digitized before entering the multi-channel encoder 14 .

[0037] On the receiver 20 side, an antenna 22...

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PUM

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Abstract

Use multitone signals to produce a main signal, usually a mono signal, and a side signal (x side ). For the side signal (x side ) provides a variety of encoding schemes (81). Each coding scheme (81) is characterized as a set of subframes (90) of different lengths. The total length of these subframes (90) is equal to the length of the coded frame (80) of the coding scheme (81). Select the side signal (x side ) the encoding scheme used on (81). In a preferred embodiment, a side residual signal is created as the difference between the side signal and the main signal scaled with a balancing factor. The balancing factor is chosen to minimize the side residual signal. The optimized side residual signal and balance factor are encoded and provided as encoding parameters representing the side signal.

Description

technical field [0001] The present invention generally relates to the encoding of audio signals, in particular the encoding of multi-channel audio signals. Background technique [0002] There is a high market need for transmitting and storing audio signals at low bit rates while maintaining high audio quality. In particular, low bit-rate operation is a necessary cost factor in cases where transmission resources or memory are constrained. This is often the case, for example, in streaming and messaging applications in mobile communication systems such as GSM, UMTS or CDMA. [0003] Today, no standardized codecs are available that provide high stereo audio quality at bit rates that are economically interesting for use in mobile communication systems. For available codecs, audio signals can be transmitted in mono. Stereo transmission to some degree is also available. However, bitrate limitations often necessitate quite drastic limitations on stereo representation. [0004] ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G10L19/00G10L19/008H04H
CPCG10L19/008G10L19/18
Inventor S·布鲁恩I·约翰松A·塔莱布D·恩斯特伦
Owner TELEFON AB LM ERICSSON (PUBL)