CN206639585U - A kind of monitoring device for differentiating acoustic source separation - Google Patents

Abstract

The utility model discloses a monitoring device for judging the directivity of a sound source, which comprises a sound signal collection unit, a sound signal processing unit and a sound signal visualization unit, the sound signal collection unit is connected with the sound signal processing unit, and the sound signal processing unit is connected with the sound signal processing unit. The visualization unit is connected; the sound signal acquisition unit is composed of a microphone array, and the microphone array is composed of 32 microphones and a circular frame. The circular frame is divided into 8 areas, and 4 microphones are randomly distributed in each area. The sound signal visualization unit includes a central processing unit and a display. The output terminal of the microphone array is connected to the sound signal processing unit, and the sound signal processing unit is connected to the sound signal visualization unit. After the sound signal passes through the sound signal processing unit, the sound information is transmitted to the sound signal visualization unit. Save and form the sound pressure distribution image display.

Description

A monitoring device for judging the directivity of sound source

technical field

The utility model relates to the field of sound measuring instruments, in particular to a monitoring device for judging the directivity of sound sources.

Background technique

Microphone array measurement first appeared in the field of underwater acoustics and ultrasound. In recent years, microphone arrays have been applied to room acoustics measurements. Use the microphone array to measure the sound pressure of multiple points in space, and then calculate the energy and direction of the corresponding plane traveling waves. There are three types of traditional microphone arrays: one-dimensional line arrays, two-dimensional area distribution arrays and three-dimensional stereo microphone arrays. But traditional microphone arrays have some drawbacks. The one-dimensional line array has great limitations in picking up the sound field direction information, and the accuracy is very low; the two-dimensional surface distribution array is limited by its planar structure and the number of array elements, and its measurement accuracy will be affected by the incident direction of the sound, and there is positioning ambiguity In this case, the error is large, and the direction information of the sound field obtained is not accurate enough; compared with the one-dimensional line array and the two-dimensional surface distribution array, the resolution of the three-dimensional stereo microphone array has been greatly improved, but its spatial resolution is in the Inhomogeneity in different directions.

Utility model content

In order to overcome the deficiencies of the prior art, the utility model proposes a monitoring device for judging the directivity of the sound source, which is suitable for measuring the sound pressure distribution of the sound source indoors, and can express the directivity of the sound source in real time and with high precision .

In order to achieve the above object, the technical solution of the utility model is:

A monitoring device for discriminating the directivity of a sound source, suitable for measuring the sound pressure distribution of a sound source indoors with high precision in real time, including a sound signal acquisition unit, a sound signal processing unit, and a sound signal visualization unit, the sound signal acquisition unit and the sound signal The processing unit is connected, and the sound signal processing unit is connected with the sound signal visualization unit;

The sound signal acquisition unit is composed of a microphone array, and the output terminal of the microphone array is connected to the sound signal processing unit.

Using the monitoring device disclosed in the above scheme, first, the microphone array is used as the sound signal acquisition unit to collect the sound signal, and the sound signal is converted into an electrical signal and transmitted to the sound signal processing unit for processing to obtain a sound image, which is displayed on the sound signal visualization unit and storage.

Preferably, the microphone array is composed of 32 microphones and a frame, wherein the frame is spherical, and the spherical frame is equally divided into 8 areas, and 4 microphones are randomly distributed in each area. The function of the microphone is to convert the sound into an electrical signal. The conversion process is: first, the diaphragm in the microphone converts the sound energy into mechanical energy, and then the mechanical energy is converted into electrical energy by the electromechanical converter, that is, the change of sound pressure becomes a diaphragm. vibration. Measurement microphones generally have no directivity. When multiple measurement microphones are arranged on a plane to form an array, the measured data will be processed with delay, and the array as a whole can become a directional system. Since the individual microphones are randomly spaced, sound sources from low to high frequencies can be captured and localized.

The microphone array consists of measurement microphones.

Preferably, the sound signal visualization unit preferably includes a central processing unit and a display, and the central processing unit saves measurement data and displays a sound pressure distribution map through the display.

Preferably, preferably, the sound signal visualization unit is a computer.

Compared with the prior art, the beneficial effect of the utility model is: adopting the monitoring device for discriminating the directivity of the sound source can capture the sound source from low frequency to high frequency, and the microphone array is composed of 32 microphones, which can conduct wide-band Frequency analysis and improved measurement accuracy.

Description of drawings

Fig. 1 is a schematic diagram of the structure of the monitoring device for judging the directivity of the sound source of the present invention.

Figure 2 is a schematic diagram of a microphone array.

detailed description

The utility model will be further described below in conjunction with the accompanying drawings, but the embodiments of the utility model are not limited thereto.

As shown in Figure 1, a monitoring device for distinguishing the directivity of sound sources is suitable for measuring the sound pressure distribution of sound sources in real time and with high precision indoors, including a sound signal acquisition unit, a sound signal processing unit and a sound signal visualization unit, and the sound signal acquisition unit The unit is connected to the sound signal processing unit, and the sound signal processing unit is connected to the sound signal visualization unit; in this embodiment, the sound signal acquisition unit is composed of a microphone array, and the output terminal of the microphone array is connected to the sound signal processing unit.

Using the monitoring device disclosed in the above scheme, first, the microphone array is used as the sound signal acquisition unit to collect the sound signal, and the sound signal is converted into an electrical signal and transmitted to the sound signal processing unit for processing to obtain a sound image, which is displayed on the sound signal visualization unit and storage.

As shown in Figure 2, the microphone array consists of 32 microphones and a frame. The frame is spherical, and the spherical frame is equally divided into 8 areas, and 4 microphones are randomly distributed in each area. The function of the microphone is to convert the sound into an electrical signal. The conversion process is: first, the diaphragm in the microphone converts the sound energy into mechanical energy, and then the mechanical energy is converted into electrical energy by the electromechanical converter, that is, the change of sound pressure becomes a diaphragm. vibration. Measurement microphones generally have no directivity. When multiple measurement microphones are arranged on a plane to form an array, the measured data will be processed with delay, and the array as a whole can become a directional system. Since the individual microphones are randomly spaced, sound sources from low to high frequencies can be captured and localized.

In this embodiment, the sound signal processing unit (Blackfin ADSP-BF512) obtains the sound pressure distribution of the sound source in real time by using the existing Beamforming method principle. Beamforming, or beamforming, is a general signal processing technology used to control the direction of propagation and the reception of radio frequency signals. According to the working principle of the beamforming method, if there is a sound source in front of the microphone array, the phases of the signals of each microphone in the array are almost the same, and a larger signal can be obtained through superposition. If the sound source is on one side of the microphone array, the signals of each microphone in the array have different arrival time due to the different distances from the sound source, and the signals of different phases are canceled out by superposition and become smaller. In this way, a directivity system is formed through signal superposition processing of the microphone array.

The embodiments of the utility model described above do not constitute a limitation to the protection scope of the utility model. Any modifications, equivalent replacements and improvements made within the spirit and principle of the utility model shall be included in the protection scope of the claims of the utility model.

Claims (4)

1. A monitoring device for discriminating sound source directivity is applicable to the sound pressure distribution of indoor measurement sound source, it is characterized in that, comprises sound signal acquisition unit, sound signal processing unit and sound signal visualization unit, sound signal acquisition unit and The sound signal processing unit is connected, and the sound signal processing unit is connected with the sound signal visualization unit; The sound signal acquisition unit is composed of a microphone array, and the output terminal of the microphone array is connected to the sound signal processing unit. 2. the monitoring device of discriminating sound source directivity according to claim 1, is characterized in that, described microphone array is made up of 32 microphones and frame, and wherein frame is spherical, and spherical frame is divided into 8 areas equally, Four microphones are randomly distributed in each area. 3. The monitoring device for judging the directivity of a sound source according to claim 1, wherein the sound signal visualization unit comprises a central processing unit and a display. 4. The monitoring device for judging the directivity of a sound source according to claim 1, wherein the sound signal visualization unit is a computer.