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Bandwidth extension encoder, bandwidth extension decoder and phase vocoder

一种带宽扩展、编码器的技术，应用在音频信号处理领域，达到防止音频质量下降、改善感知质量、提高感知音频质量的效果

Active Publication Date: 2012-05-23
FRAUNHOFER GESELLSCHAFT ZUR FOERDERUNG DER ANGEWANDTEN FORSCHUNG EV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, preferably, the measurement of the just mentioned degradation in perceived audio quality does not significantly increase the computational complexity of the codec used

Method used

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  • Bandwidth extension encoder, bandwidth extension decoder and phase vocoder
  • Bandwidth extension encoder, bandwidth extension decoder and phase vocoder
  • Bandwidth extension encoder, bandwidth extension decoder and phase vocoder

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Embodiment Construction

[0038] figure 1 A block diagram of a bandwidth extension encoder 100 for encoding an audio signal 101-1 according to an embodiment of the invention is shown. The audio signal 101-1 includes a low frequency signal 101-2 having a core frequency band 101-3 and a high frequency signal 101-4 having an upper frequency band 101-5. The bandwidth extension encoder 100 includes a signal analyzer 110 , a core encoder 120 and a parameter calculator 130 . The signal analyzer 110 is configured to analyze an audio signal 101-1 having a block 101-6 of audio samples having a certain length of time. The signal analyzer 110 is further configured to determine from the plurality of analysis windows 111 - 1 an analysis window 111 - 2 to be used for bandwidth extension in eg the bandwidth extension decoder 200 . The core encoder 120 is configured to encode the low frequency signal 101 - 2 to obtain an encoded low frequency signal 121 . Finally, the parameter calculator 130 is configured to calcul...

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Abstract

A bandwidth extension encoder for encoding an audio signal comprises a signal analyzer, a core encoder and a parameter calculator. The audio signal comprises a low frequency signal comprising a core frequency band and a high frequency signal comprising an upper frequency band. The signal analyzer is configured for analyzing the audio signal, the audio signal having a block of audio samples, the block having a specified length in time. The signal analyzer is furthermore configured for determining from a plurality of analysis windows an analysis window to be used for performing a bandwidth extension in a bandwidth extension decoder. The core encoder is configured for encoding the low frequency signal to obtain an encoded or frequency signal. The parameter calculator is configured for calculating bandwidth extension parameters from the high frequency signal.

Description

technical field [0001] The present invention relates to audio signal processing, in particular to a bandwidth extension encoder, a method for encoding an audio signal, a bandwidth extension decoder, a method for decoding an encoded audio signal, a phase vocoder and an audio signal. [0002] Furthermore, embodiments of the invention relate to the use of phase vocoders for pure time extension independent of bandwidth extension. Background technique [0003] The storage or transmission of audio signals is usually strictly limited by the bit rate. These constraints are usually due to the fact that coders / decoders (codecs) efficiently compress audio signals according to the information rate required to store or transmit the signal. In the past, encoders had to rapidly reduce audio bandwidth when only very low bit rates were available. Modern audio codecs are able to encode wideband signals by using the bandwidth extension (BWE) method, such as M.Dietz, L.Liljeryd, K. "Spectra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10L19/02G10L19/14G10L21/02G10L21/04
CPCG10L19/022G10L21/038G10L19/0208G10L21/04G10L19/24G10L19/20G10L19/02
Inventor 福雷德里克·纳格尔马库斯·穆赖特鲁斯萨沙·迪施耶雷米·勒科米特克里斯蒂安·厄特尔帕特里克·瓦姆博尔德
Owner FRAUNHOFER GESELLSCHAFT ZUR FOERDERUNG DER ANGEWANDTEN FORSCHUNG EV
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