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Method and system for evaluating non-linear distortion, method and system for adjusting parameters

A nonlinear distortion and nonlinear technology, applied in sensor parts, sensors, electrical components, etc.

Inactive Publication Date: 2013-01-09
DOLBY LAB LICENSING CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In other words, there is nonlinear distortion in the output of the speaker

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Embodiment Construction

[0023] Embodiments of the present invention are described below with reference to the drawings. It should be noted that, for the purpose of clarity, representations and descriptions of parts and processes that are known to those skilled in the art but are not necessary for the understanding of the present invention are omitted in the drawings and descriptions.

[0024] Those skilled in the art can understand that various aspects of the present invention can be implemented as a system, method or computer program product. Therefore, the present invention can be embodied in the following forms, that is, it can be an entirely hardware embodiment, an entirely software embodiment (including firmware, resident software, microcode, etc.), or an embodiment combining software parts and hardware parts. Generally referred to as "circuit", "module" or "system". Furthermore, various aspects of the present invention may take the form of a computer program product embodied in one or more com...

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Abstract

The invention describes embodiments for evaluating non-linear distortion and adjusting parameter for improving sound. A test signal comprising at least two of simultaneously audible single-tone signals can be generated. A single tone is a fundamental tone, and the other single tones are the harmonic waves of the fundamental tone. As an example, the ratio of the number of the non-linear distortion products which is not fit with the frequency of the single tone to the number of all the products is greater than 0.80. The spectrum analysis is carried out aiming at the response of a loudspeaker to the test signal. A non-linear distortion value is evaluated by taking the energy which is under the harmonic frequency of the fundamental tone signal rather than the frequency of the single tone signal as the contribution of the non-linear distortion. The subjectivity-related measurement of the non-linear distortion is obtained for adjusting parameters for improving the low-frequency output of one or multiple loudspeaker(s).

Description

technical field [0001] The invention relates to nonlinear distortion measurement and parameter adjustment of loudspeaker systems. More particularly, embodiments of the present invention relate to methods and systems for estimating nonlinear distortion of speakers, and methods and systems for adjusting parameters for boosting the sound of speakers. Background technique [0002] Typically, the output signal of a loudspeaker may have a non-linear relationship to the input signal of the loudspeaker. In other words, there is nonlinear distortion in the output of the loudspeaker. Various methods have been proposed to estimate nonlinear distortion in the output of a loudspeaker. According to one type of method, a multi-tone test signal is used to estimate nonlinear distortion. A polyphonic test signal is the sum of several sine waves whose frequencies are generally logarithmically distributed over the audio range, which is considered to resemble the spectrum of a musical signal....

Claims

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Application Information

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IPC IPC(8): G01R23/20H04R3/00
CPCH04R29/003H04R3/08H04R29/001
Inventor 邓惠群
Owner DOLBY LAB LICENSING CORP
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