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Method for balancing frequency response of sound reproduction system through online iteration

A frequency response equalization and iterative technology, applied in transducer acoustic response prevention, error detection coding using multi-bit parity bits, transducer circuits, etc., can solve the problem of not reaching the flat frequency response characteristic

Active Publication Date: 2015-03-25
SUZHOU SONAVOX ELECTRONICS
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Problems solved by technology

The parameter estimation process of these methods all rely on the least mean square error (Least Mean Squares—LMS) algorithm or a single estimate of the linear predictive coding (LPC) algorithm to calculate the parameters of the equalizer. There is still a certain degree of deviation between the obtained inverse filter parameters and the ideal inverse filter parameters, and these deviations will cause the frequency response curve of the equalized sound playback system to still have obvious peak-to-valley fluctuations in some frequency bands , has not yet achieved the ideal flat frequency response

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  • Method for balancing frequency response of sound reproduction system through online iteration
  • Method for balancing frequency response of sound reproduction system through online iteration
  • Method for balancing frequency response of sound reproduction system through online iteration

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Embodiment

[0125] In this embodiment, it is assumed that the sound reproduction system works in a balanced mode, and the loudspeaker is the sound source Figure 10 For the white noise signal shown, the microphone is placed 1 meter away from the axis of the speaker unit, and the time-domain waveform of the feedback signal recorded by the microphone is as follows: Figure 11 shown. Assume that the order of equalizers at all levels to be estimated is 600, and the number of iterative equalization is set to 10.

[0126] Figure 12 The comparison charts of the frequency response curves of the system under three conditions of unequalized, 1-iterative equalization and 10-iterative equalization are given. Comparing these three sets of curves, it can be seen that the frequency response curve of the system has a very obvious peak in the frequency range of 1.5 KHz to 4.5 KHz when no equalizer is applied; The peak value in the frequency range of 1.5KHz~4.5KHz has been eliminated, but there is stil...

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Abstract

A method and device for balancing frequency response of a sound playback system through online iteration. The method comprises: (1) turning the system to a balancing mode, setting a sound source (1) as a noise signal, then controlling the system to play the noise signal, and acquiring and recoding a feedback signal through a sensor; (2) combining the noise signal and the feedback signal, and estimating parameters of all levels of balancers sequentially through a least mean squares (LMS) criterion of step-by-step iteration; (3) cascading the all levels of the balancers to form a synthesized balancer; and (4) placing the synthesized balancer to a signal processing channel, finishing the operation of balancing the system frequency response, and then turning the system to a normal play mode. The device comprises the sound source (1), a digital signal processor (2), a power amplifier (3), a loudspeaker (4), and a feedback signal receiving module (5).

Description

technical field [0001] The invention relates to a frequency response equalization method and device for a sound reproduction system, in particular to an online iterative frequency response equalization method and device for a sound reproduction system. Background technique [0002] In recent years, with the rapid development of large-scale integrated circuits and digital signal processing technology, the problem of sound playback system response balance based on digital signal processing technology has gradually attracted the attention of many research institutions and enterprises at home and abroad, and several companies Launched several acoustic products with responsive equalization. Dirac, a subsidiary of Uppsala University, launched the Dirac HD Sound technology to solve the peak-to-valley point equalization of the frequency response curve of the speaker unit in a free field environment, and also launched the Dirac Live technology to solve the room The peak-to-valley po...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04R3/00H03M13/11H03M13/27
CPCH04R3/02
Inventor 马登永
Owner SUZHOU SONAVOX ELECTRONICS