Method and apparatus for signal processing using transform-domain log-companding

A compression expansion and logarithmic compression technology, applied in the field of communication, can solve problems such as complex methods, high power consumption and waiting time

Inactive Publication Date: 2011-08-24
QUALCOMM INC
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Problems solved by technology

However, while achieving these large compression ratios, these methods are complex, come at the expense of high power consuming compress

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  • Method and apparatus for signal processing using transform-domain log-companding
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  • Method and apparatus for signal processing using transform-domain log-companding

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Embodiment Construction

[0032]Various aspects are described more fully hereinafter with reference to the accompanying drawings. Aspects disclosed herein may, however, be embodied in many different forms and should not be construed as limited to any specific structure or function set forth in this disclosure. Rather, these aspects are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. Based on the teachings herein one skilled in the art should appreciate that the scope of the present disclosure is intended to cover any aspect disclosed herein, whether implemented independently or in combination with any other aspect. For example, an apparatus may be implemented or a method may be practiced using any number of the aspects set forth herein. Furthermore, the scope of the present disclosure is intended to encompass an apparatus or method implemented using other structure, function, or structure and function in add...

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Abstract

A method and apparatus for audio signal processing by applying log companding on spectral domain or time domain representations of the audio signals to provide an encoded audio signal, which is decoded upon receipt. A frequency domain representation or time domain representation of the audio signal is computed by separating the audio signal into specific frequency bands, each having a coefficient. Log companding with different compression ratios is performed on each coefficient to provide an encoded signal. Upon receipt of the encoded signal, inverse log companding and time frequency or time scale reconstruction are performed to provide the audio signal.

Description

[0001] This patent application claims Provisional Application No. 61 / 100,645 (Attorney Docket No. 082855P1), filed September 26, 2008, entitled "Transform-Domain Log Companding" and filed September 29, 2008, entitled Priority to Provisional Application No. 61 / 101,070 (Attorney Docket No. 082855P2) for "Transform-Domain Log Companding." Each of the foregoing applications is assigned to the assignee of the present application and is hereby expressly incorporated by reference herein. technical field [0002] The present disclosure relates generally to communications and, more particularly, to signal compression using spectral domain log compand. Background technique [0003] Audio (eg, voice and music) transmission via digital technologies has become common, especially in long-distance telephony, packet-switched telephony (eg, Voice over Internet Protocol (VoIP)), and digital wireless telephony (eg, cellular telephones). The proliferation of audio transmissions has created an ...

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Application Information

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IPC IPC(8): H03M7/50G10L19/02
CPCG10L19/032G10L19/0204G10L19/0212H03M7/50G10L19/02H03M7/30
Inventor H·加鲁达德里Y-L·舒S·马宗达
Owner QUALCOMM INC
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