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Room impulse response function measuring method allowing using quantity of microphones to be reduced

A technology of impulse response and measurement method, applied in the direction of electrical components, etc., can solve problems such as long process time, obstacle influence, measurement difficulty, etc., and achieve the effect of easy measurement

Inactive Publication Date: 2014-10-15
DALIAN UNIV OF TECH
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Problems solved by technology

[0010] In summary, the existing techniques for reducing the number of microphones used in transfer function acquisition have the following problems: (1) It is difficult to measure in a room with a large space, and it is affected by obstacles in the space; The process takes too long and requires a large number of samples

Method used

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  • Room impulse response function measuring method allowing using quantity of microphones to be reduced
  • Room impulse response function measuring method allowing using quantity of microphones to be reduced
  • Room impulse response function measuring method allowing using quantity of microphones to be reduced

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Embodiment Construction

[0083] The present invention will be further described below in conjunction with the accompanying drawings.

[0084] For verifying the feasibility of the present invention, according to image 3 The flow shown is simulated. The virtual room used in the experiment is 5 meters long and wide, ignoring the influence of the roof and the ground on the sound field, and only considering the sound field distribution on a fixed horizontal plane. One speaker position is (0.4,2.4). The observation area A is a square area with a side length of 2.6m, and the coordinates of the control point at the lower left corner are (1.3,1). The control points are uniformly distributed in the observation area, such as Figure 4 shown.

[0085] The process of building a GMM model is as follows: Figure 5 As shown, the K-means method and the EM iterative method used a threshold of 10-10.

[0086] First, the number of microphones needs to be determined. Such as Figure 6 As shown, the listening area...

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Abstract

The invention discloses a room impulse response function measuring method allowing the using quantity of microphones to be reduced. The room impulse response function measuring method allowing the using quantity of the microphones to be reduced comprises the following steps that a proper quantity of microphones are distributed and arranged in a space in an even and equal division mode, transfer functions are measured, and the obtained transfer functions serve as a training database; a GMM is established by using the obtained training database and corresponding position information, and model parameters are obtained; a GMR is established by using the model parameters, and an input and output formula is obtained; position coordinates are input to the input and output formula, and the transfer functions of corresponding positions are obtained. According to the room impulse response function measuring method allowing the using quantity of the microphones to be reduced, modeling is conducted on the position coordinates and the transfer functions corresponding to the positions by using the GMM, and then the input and output formula of the position coordinates and the transfer functions corresponding to the positions is obtained by using the GMR. The transfer function corresponding to the position can be obtained by inputting any position coordinate in an observation area. According to the room impulse response function measuring method, the quantity of the microphones used in the process of measuring the transfer functions can be effectively reduced, and the obtained data are more accurate.

Description

technical field [0001] The invention relates to sound synthesis processing technology, in particular to a room impulse response function measurement method which reduces the number of microphones used. Background technique [0002] Sound Field Synthesis (WFS) technology is based on the Huygens principle to synthesize a three-dimensional sound field in a large range. It has a wide range of applications in consumer electronics, communications and other fields. The audience can feel the location information of the sound source in the synthesized sound field, so as to have an "immersive" feeling. The application of sound field synthesis is mostly indoors, and the reflection of sound waves by the walls of the room will reduce the quality of the synthesized sound field, so room compensation needs to be added in practical applications. [0003] Before performing room compensation, the transfer functions of each loudspeaker to some positions in the observation area (synthesized so...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04R29/00
Inventor 陈喆殷福亮王建超
Owner DALIAN UNIV OF TECH
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