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An apparatus and a method for decoding an encoded audio signal

A technology of audio signal and coding algorithm, applied in speech analysis, code conversion, electrical components, etc.

Active Publication Date: 2011-06-08
FRAUNHOFER GESELLSCHAFT ZUR FOERDERUNG DER ANGEWANDTEN FORSCHUNG EV
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the problem is the quality of the speech signal at low bit rates

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  • An apparatus and a method for decoding an encoded audio signal
  • An apparatus and a method for decoding an encoded audio signal
  • An apparatus and a method for decoding an encoded audio signal

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Embodiment Construction

[0028] figure 1 A decoder device 100 to decode an encoded audio signal 102 is shown. The decoded audio signal 102 comprises a first part 104a encoded according to a first encoding algorithm, a second part 104b encoded according to a second encoding algorithm, a BWE parameter 106 for the first time part 104a and the second time part 104b and indicates for each time part Coding mode information 108 for the first decoding algorithm or the second decoding algorithm. The device 100 for decoding includes a first decoder 110 a , a second decoder 110 b , a BWE module 130 and a controller 140 . The first decoder 110a is adapted to decode the first portion 104a according to a first decoding algorithm for the first temporal portion of the encoded signal 102 to obtain a first decoded signal 114a. The second decoder 110b decodes the second portion 104b according to a second decoding algorithm for the second temporal portion of the encoded signal to obtain a second decoded signal 114b. T...

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Abstract

An apparatus for decoding an encoded audio signal, the encoded audio signal comprising a first portion encoded in accordance with a first encoding algorithm, a second portion encoded in accordance with a second encoding algorithm, BWE parameters for the first portion and the second portion and a coding mode information indicating a first decoding algorithm or a second decoding algorithm, comprises a first decoder, a second decoder, a BWE module and a controller. The first decoder decodes the first portion in accordance with the first decoding algorithm for a first time portion of the encoded signal to obtain a first decoded signal. The second decoder decodes the second portion in accordance with the second decoding algorithm for a second time portion of the encoded signal to obtain a second decoded signal. The BWE module has a controllable crossover frequency (fx) and is configured for performing a bandwidth extension algorithm using the first decoded signal and the BWE parameters for the first portion, and for performing a bandwidth extension algorithm using the second decoded signal and the bandwidth extension parameter for the second portion. The controller controls the crossover frequency (fx) for the BWE module in accordance with the coding mode information.

Description

technical field [0001] The invention relates to a device and a method for decoding an encoded audio signal, a device for encoding, a method for encoding and an audio signal. Background technique [0002] Frequency domain coding schemes such as MP3 or AAC are known in the prior art. These frequency-domain encoders are based on a time-domain / frequency-domain conversion, followed by a quantization stage in which the quantization error is controlled using information from the psychoacoustic module, and an encoding stage in which the quantized spectral coefficients and their corresponding The side information is entropy encoded. [0003] On the other hand, AMR-WB+ as described in 3GPP TS 26.290 is well suited as a coder for speech processing. This speech coding scheme performs linear prediction (LP) of the filtered time-domain signal. This LP filtering originates from the linear predictive analysis of the input time-domain signal. The resulting LP filter coefficients are then...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10L19/14G10L21/02
CPCG10L19/20G10L21/038G10L19/008G10L19/0212G10L21/04G10L19/022G10L19/18G10L19/02G10L19/04H03M7/30
Inventor 马克思·诺伊恩多夫伯恩哈德·格里尔乌尔里赫·克里默马库斯·穆尔特鲁斯哈拉尔德·波普尼古劳斯·雷特尔巴弗雷德里克·内格尔马库斯·洛瓦索马雷·盖尔曼努埃尔·扬德尔维尔吉利奥·巴奇加卢波
Owner FRAUNHOFER GESELLSCHAFT ZUR FOERDERUNG DER ANGEWANDTEN FORSCHUNG EV
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