Apparatus and method for generating a high frequency audio signal using adaptive oversampling

An audio signal and oversampling technology, applied in speech analysis, instruments, etc., can solve problems such as computational complexity, and achieve the effect of reduced complexity and good instantaneous characteristics

Active Publication Date: 2012-08-22
DOLBY INT AB +1
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  • Summary
  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

However, especially since the BWE algorithm is performed at the decoder side of the codec chain, computational complexity is a serious problem

Method used

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  • Apparatus and method for generating a high frequency audio signal using adaptive oversampling
  • Apparatus and method for generating a high frequency audio signal using adaptive oversampling
  • Apparatus and method for generating a high frequency audio signal using adaptive oversampling

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other Embodiment approach

[0064] Other embodiments comprise a computer program for performing one of the methods described herein, stored on a machine-readable carrier.

[0065] In other words, therefore, an embodiment of the method of the invention is a computer program with a program code to perform one of the methods described herein when the computer program is run on a computer.

[0066] Therefore, another embodiment of the methods of the present invention is a data carrier (or a digital storage medium or a computer readable medium) comprising recorded thereon a computer program for carrying out the steps of the methods described herein. A sort of.

[0067] A further embodiment of the methods of the invention is therefore a data stream or a sequence of signals representing a computer program for performing one of the methods described herein. Said data stream or signal sequence may eg be configured to be transmitted via a data communication connection, eg via the Internet.

[0068] Another embod...

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Abstract

An apparatus for generating a high frequency audio signal that comprises an analyzer (12) for analyzing an input signal to determine a transient information adaptively. Additionally a spectral converter (14) is provided for converting the input signal into an input spectral representation. A spectral processor (13) processes the input spectral representation to generate a processed spectral representation comprising values for higher frequencies than the input spectral representation. A time converter (17) is configured for converting the processed spectral representation to a time representation, wherein the spectral converter or the time converter are controllable to perform a frequency domain oversampling for the first portion of the input signal having the transient information associated and to not perform the frequency domain oversampling for the second portion of the input signal not having the associated transient information.

Description

technical field [0001] The present invention relates to the encoding of audio signals, and more particularly to a method of high frequency reconstruction comprising a frequency domain transposer, such as a harmonic transposer. Background technique [0002] In the prior art, there are various methods for high frequency reconstruction using harmonic transformation or time stretching or similar. One method used is based on a phase vocoder. These methods operate under the principle of frequency analysis with sufficiently high frequency resolution and signal modification in the frequency domain before synthesizing the signal. Time stretching or transforming depends on a combination of analysis window, analysis window step, synthesis window, synthesis window step, and phase adjustment of the analysis signal. [0003] An unavoidable problem with these methods is the conflict between the frequency resolution required to obtain the high-quality transforms required for stable sound ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10L21/02G10L19/02G10L19/025G10L21/038
CPCG10L19/025G10L21/038G10L19/02G10L21/02
Inventor 拉尔斯·维莱蒙斯佩尔·埃克斯特兰德萨沙·迪施福雷德里克·纳格尔斯特凡·维尔德
Owner DOLBY INT AB
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