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Quasi adaptive acoustic equalization method and apparatus thereof

An equalization method and self-adaptive technology, applied in the direction of frequency/direction characteristic device, etc., can solve the problems of lack of effective method, unsatisfactory effect, frequency band limitation, etc. Effect

Inactive Publication Date: 2012-06-27
NANJING LANGSHENG ACOUSTIC TECH
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Problems solved by technology

[0007] The above method only solves the problem of a certain aspect (indoor acoustics or electroacoustics), and the improved frequency band is also very limited (low frequency band, frequency band near the crossover point or full frequency band), which is not comprehensive enough, and the effect is not satisfactory, lacking a unified effective method

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  • Quasi adaptive acoustic equalization method and apparatus thereof
  • Quasi adaptive acoustic equalization method and apparatus thereof
  • Quasi adaptive acoustic equalization method and apparatus thereof

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Embodiment Construction

[0015] The specific implementation method of the present invention is described below.

[0016] This overall equalizer is composed of a measurement microphone and several DSP algorithm modules, the core module of which is the modal equalizer H c (z), phase equalizer H p (z) and amplitude equalizer H m (z), all three are realized by digital filters with adjustable parameters. Three equalizers are applied to the speaker system.

[0017] In actual use, first initialize the three equalizers so that their transfer functions are all 1. The three condition selection switches are all in the closed state. Place the measurement microphone at the listening position to be equalized in the room, and the speaker system generates a random signal or sweep signal x[n], which is passed through the amplitude equalizer H m After (z), it is simultaneously fed into the modal equalizer H c (z) frequency division network low-pass channel and phase equalizer H p (z) high-pass channel, and do DA...

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Abstract

A quasi adaptive acoustic equalization method is characterized by: using an adaptive digital filter and a corresponding DSP algorithm module to realize changing of a sound source signal and carry out adaptive processing to a whole audio frequency pass band; using a quasi adaptive acoustic overall equalizer, which combines modal equalization, phase equalization and amplitude equalization, to process the whole audio frequency pass band; firstly carrying out low band modal equalization to a low pass channel of a frequency division network; then superposing high and low pass sound signals in an area which is close to a frequency division point on a high pass channel and carrying out the phase equalization; and then carrying out the amplitude equalization to a whole frequency band and a high frequency band so as to realize comprehensive optimization processing to the whole audio frequency pass band. The general equalization means that a measurement microphone and several DSP algorithm modules form a modal equalizer module, a phase equalizer module and an amplitude equalizer module respectively so as to realize and have effect on a loudspeaker system. The three modules can be realized by using a digital filter with an adjustable parameter. Finally, the needed audio signal can be obtained.

Description

technical field [0001] The invention relates to an adaptive acoustic equalization method and an equalization device, which can be widely used in loudspeaker systems in rooms according to the design of the frequency division network, the adaptive digital filter and the realization of the DSP algorithm module. Background technique [0002] The theoretical aspects of traditional crossover networks have been thoroughly studied, but in actual listening environments other than anechoic rooms, such as ordinary rooms, the actual performance of speaker systems using traditional crossover networks often deviates from theoretical predictions This is due to the interaction between the actual room and the speaker system, and this interaction, or room effect, often makes the actual listening effect worse, and the more common playback sound pressure level frequency response curve fluctuates , Low-frequency modal reverberation time is too long, and the peak and valley near the crossover fre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04R1/20
Inventor 沈勇沈小祥
Owner NANJING LANGSHENG ACOUSTIC TECH
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