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Systems, methods, and apparatus for detection of tonal components

A technology of equipment and energy, applied in the field of signal processing, can solve the problems of weakening the waveform matching ability of conventional time-domain encoders, and the inability of time-domain encoders to maintain high-quality and robust performance

Active Publication Date: 2008-12-10
QUALCOMM INC
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, at low bit rates (4kbps and below), time domain coders may not be able to maintain high quality and robust performance due to the limited number of available bits
For example, the limited codebook space available at low bit rates can impair the waveform matching capabilities of conventional time-domain coders

Method used

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  • Systems, methods, and apparatus for detection of tonal components
  • Systems, methods, and apparatus for detection of tonal components
  • Systems, methods, and apparatus for detection of tonal components

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Embodiment Construction

[0039]Systems, methods, and devices are described herein for detecting signals with spectral peaks (also referred to as "tonal components" or "tones") with narrow bandwidths. The scope of the described configurations includes implementations that perform this detection using the parameters of the linear predictive coding (LPC) analysis scheme commonly used in speech coders, thereby reducing the computational complexity compared to methods using a separate pitch detector sex.

[0040] Unless the context clearly dictates otherwise, the term "computation" is used herein to denote any of its ordinary meanings, such as to operate on, produce, and select from a list of values. Where the term "comprising" is used in the description and claims, it does not exclude other elements or operations. The term "A is based on B" is used to indicate any of its ordinary meanings, including the following: (i) "A equals B" and (ii) "A is based on at least B."

[0041] Examples of tones include s...

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Abstract

Systems, methods, and apparatus for the detection of signals having spectral peaks with narrow bandwidth are described herein. The range of described configurations includes implementations that perform such detection using parameters of a linear prediction coding (LPC) analysis scheme.

Description

[0001] Related applications [0002] This application claims the benefit of U.S. Provisional Patent Application No. 60 / 742,846, filed December 5, 2005, and entitled "DETECTION OF NARROWBANDSIGNALS USING LPC ANALYSIS" (Attorney Docket No. 050299P1). technical field [0003] This disclosure relates to signal processing. Background technique [0004] Transmission of voice over digital technologies has become commonplace, especially in long distance telephony, packet switched telephony such as voice over IP (VoIP), and digital wireless telephony such as cellular telephones. This rapid development has sparked interest in determining the minimum amount of information that can be sent over a channel while maintaining the perceived quality of the reconstructed speech. If voice is transmitted by sampling and digitizing only, a data rate of approximately 64 kilobits per second (kbps) may be required to achieve voice quality comparable to that of conventional analog cable telephones....

Claims

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Application Information

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IPC IPC(8): G10L19/14G10L11/00G10L19/06H04M11/06H04Q1/444
CPCG10L19/18G10L19/22G10L25/78G10L19/02G10L19/12
Inventor 沙拉特·曼朱纳特阿南塔帕德马纳卜汉·坎达达伊
Owner QUALCOMM INC
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