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Audio signal processing

一种音频信号处理、音频信号的技术，应用在语音分析、频率响应校正、仪器等方向，达到效果降低、改进质量、伪影或降级减轻的效果

Active Publication Date: 2018-06-08
KONINKLJIJKE PHILIPS NV
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  • Abstract
  • Description
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Problems solved by technology

However, when using non-ideal filters in this case, some aliasing of frequency components from one subband into another is unavoidable

Method used

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  • Audio signal processing
  • Audio signal processing
  • Audio signal processing

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Embodiment Construction

[0078] The following description focuses on an embodiment of the invention suitable for efficient processing of digitized speech signals and particularly applicable to echo cancellation for speech applications. However, it will be appreciated that the invention is not limited to this application, but may be applied to many other audio signals and audio applications.

[0079] As mentioned, it is known to divide an audio signal into several subband signals corresponding to different frequency bands of the audio signal. This division is typically into two sub-bands, and the following description will focus on embodiments where the audio signal is divided into two sub-bands which are then processed individually and separately.

[0080] After splitting into subbands (and in particular into two subbands), the signal can be decimated in order to reduce the complexity and resource requirements of subsequent processing. Since the filter divides the audio signal into subbands, such dec...

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Abstract

An audio signal processing apparatus comprises a receiver (403) receiving an audio signal sampled at a first sampling frequency, the audio signal having a maximum frequency below half the first sampling frequency by a first frequency margin. A filter bank (405) generates subband signals for the digital audio signal using overlapping sub-filters. A first frequency shifter (407) applies a frequencyshift to at least one subband of the set of subbands and a decimator (409) decimates the subband signals by a decimation factor resulting in a decimated sampling frequency being at least twice a bandwidth of each of the overlapping sub-filters. The frequency shift for a subband is arranged to shift the subband to a frequency interval being a multiple of a frequency interval from zero to half the decimated sample frequency. The subband may be individually processed and the processed subbands may subsequently be combined to generate a full band output signal.

Description

technical field [0001] The present invention relates to methods and apparatus for audio signal processing, and in particular but not exclusively to the processing of audio speech signals. Background technique [0002] Digital processing of audio signals has become increasingly common and is now part of many practical applications. Indeed, it is currently implemented in many everyday consumer electronic devices including, for example, mobile phones, music distribution and presentation, televisions, and others. [0003] In order to provide improved, new or more flexible processing, the audio processing algorithms used tend to become more and more complex, and indeed in many cases the signal processing is limited by the available computing resources. One example is speech signal processing for speech communication devices, where speech coding along with speech enhancement typically consumes a very large portion of computing resources. Therefore, there is a general desire to i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10L21/02H03H17/06
CPCG10L21/02H03H17/0266G10L21/0232H03H17/06G10L21/038G10L2021/02082H04R3/04
Inventor C.P.詹森L.C.A.范斯图伊文伯格
Owner KONINKLJIJKE PHILIPS NV
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