Automatic loudspeaker equalization method

An automatic equalization, loudspeaker technology, applied in the direction of sensors, transducer circuits, stereo systems, etc.

Active Publication Date: 2014-03-12
SUZHOU SONAVOX ELECTRONICS
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Problems solved by technology

However, since the frequency resolution of the low-frequency band is low, in order to improve the low-frequency resolution, the order of the filter needs to be increased, which increases the computational complexity
In addition, for small-diameter speaker units, if the energy of the low-frequency signal is increased by direct equalization, it will cause distortion of the playback signal and even damage the speaker system.

Method used

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  • Automatic loudspeaker equalization method
  • Automatic loudspeaker equalization method
  • Automatic loudspeaker equalization method

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Embodiment Construction

[0048] Below in conjunction with accompanying drawing and specific embodiment the present invention is described in further detail:

[0049] The present invention first measures the impulse response of the loudspeaker system at multiple positions in the room through a microphone, determines its prototype function from multiple impulse responses, and uses an adaptive optimization algorithm to calculate the equalization filter of the prototype function; determines the loudspeaker system according to the prototype function Low frequency lower limit frequency, virtual bass enhancement is performed on the input signal lower than this frequency, so as to realize the automatic equalization of the speaker system in the whole frequency band.

[0050] Such as figure 1 The shown speaker automatic equalization system according to the present invention, its main body is made up of sound source 101, virtual bass enhancement module 102, dynamic range control 103, delay unit 104, equalizatio...

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Abstract

The invention provides an automatic loudspeaker equalization system, particularly relates to an automatic loudspeaker equalization method, and aims to improve sound replaying performance of a loudspeaker system on full bands. The method includes measuring pulse responses at one or more position points in a room by a microphone to acquire a frequency response of each position point and low-frequency lower limit of the loudspeaker system, and acquiring an equilibrium filter by the adaptive optimization algorithm to compensate the loudspeaker system. For low-frequency signals with frequency lower than the lower-limit frequency of the loudspeaker system, ultraharmonics components of fundamental-frequency signals are generated according to the psychoacoustics based fundamental-frequency missing principle and are superposed with delayed original sound signals after being subjected to gain control, and accordingly, the sound replaying performance of the loudspeaker system on full bands is improved.

Description

technical field [0001] The invention relates to the technical field of audio signal processing, in particular to a loudspeaker automatic equalization system, which aims to correct the frequency characteristics of a listening position in a room, improve the sound reproduction capability of a loudspeaker system, and improve sound quality. More specifically, this equalization method includes virtual bass enhancement technology, which generates harmonic components of low-frequency components through nonlinearity, so as to improve the perception of low-frequency components. Background technique [0002] An ideal sound reproduction system should have a relatively flat frequency response in the entire frequency range, but due to the limitation of the manufacturing process in the production process, the speaker system cannot have an ideal frequency response, and there is a certain amount of distortion. On the other hand, realistic sound reproduction cannot be fully realized at the l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04R3/00
CPCH04R29/001H04R3/00H04R2499/13H04S7/301H04S7/307
Inventor 叶超
Owner SUZHOU SONAVOX ELECTRONICS
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