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Temporal masking in audio coding based on spectral dynamics in frequency sub-bands

A time and masking threshold technology, applied in speech analysis, instruments, etc., can solve problems such as different voice modes

Inactive Publication Date: 2010-07-14
QUALCOMM INC
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, speech patterns can be very different between individuals

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  • Temporal masking in audio coding based on spectral dynamics in frequency sub-bands
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  • Temporal masking in audio coding based on spectral dynamics in frequency sub-bands

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Embodiment Construction

[0045] The following detailed description, which references and incorporates the drawings, describes and illustrates one or more particular embodiments. These embodiments have been shown and described in sufficient detail to enable those skilled in the art to practice what is claimed, and are not provided to be limiting but merely to illustrate and teach. Therefore, for the sake of brevity, the description may omit certain information known to those skilled in the art.

[0046] The word "exemplary" is used herein to mean "serving as an example, instance, or illustration." Any embodiment or variation described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments or variations. All embodiments and variations described in this description are exemplary embodiments and variations provided to enable persons skilled in the art to make and use the invention and not necessarily to limit the scope of legal protection given by the...

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Abstract

An audio coding technique based on modeling spectral dynamics is disclosed. Frequency decomposition of an input audio signal is performed to obtain multiple frequency sub-bands that closely follow critical bands of human auditory system decomposition. Each sub-band is then frequency transformed and linear prediction is applied. This results in a Hilbert envelope and a Hilbert Carrier for each of the sub-bands. Because of application of linear prediction to frequency components, the technique is called Frequency Domain Linear Prediction (FDLP). The Hilbert envelope and the Hilbert Carrier are analogous to spectral envelope and excitation signals in the Time Domain Linear Prediction (TDLP) techniques. Temporal masking is applied to the FDLP sub-bands to improve the compression efficiency. Specifically, forward masking of the sub-band FDLP carrier signal can be employed to improve compression efficiency of an encoded signal.

Description

[0001] Claim of priority under 35 U.S.C. §119 [0002] This patent application claims the title of "Temporal Masking in Audio Coding Based on Spectral Dynamics in Sub-Bands" filed on August 24, 2007. 957,977, which is assigned to the present assignee and is hereby expressly incorporated by reference herein. technical field [0003] The present invention relates generally to digital signal processing, and more specifically, to techniques for encoding and decoding signals for storage and / or communication. Background technique [0004] In digital communications, signals are typically encoded for transmission and decoded for reception. Encoding of a signal involves converting an original signal into a format suitable for propagation via a transmission medium. The goal is to maintain the quality of the original signal, but consume less media bandwidth. The decoding of the signal involves the inversion of the decoding process. [0005] Known decoding schemes use the technique...

Claims

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Application Information

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IPC IPC(8): G10L19/02G10L19/00G10L19/04G10L19/12
CPCG10L19/02G10L19/025G10L19/10G10L19/0204G10L19/03G10L19/00
Inventor 哈里纳特·加吕达德里彼得·莫特利采克斯里拉姆·加纳帕蒂海尼克·赫尔曼斯基
Owner QUALCOMM INC
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