Field emission noise identification device with automatic calibration function

Abstract

The utility model belongs to the field of noise monitoring, and particularly relates to a field emission noise identification device with an automatic calibration function, which comprises a front-end outdoor microphone array, an electrostatic exciter, an automatic calibration control module and a monitoring terminal host. A plurality of outdoor microphones and standard sound sources are arranged in the front-end outdoor microphone array, each outdoor microphone is connected with the monitoring terminal host through a first BNC cable, and each standard sound source is connected with the automatic calibration control module through a first self-calibration cable; the automatic calibration control module is connected with the electrostatic exciter through a second self-calibration cable, and is connected with the monitoring terminal host through an RS232 serial port cable; the electrostatic exciter is connected with a DAC output interface of the monitoring terminal host through a second BNC cable. The front-end outdoor microphone array comprises the outdoor microphones integrated with the standard sound source, so that the front-end outdoor microphone array has an automatic calibration function while field boundary emission noise in any direction in a monitoring area is not influenced.

Description

Technical Field

[0001] The utility model belongs to the field of noise monitoring, and in particular relates to a field boundary emission noise identification device with automatic calibration. Background Art

[0002] Many factories or construction sites are adjacent to residential areas. The noise caused by factory production or construction seriously affects the quality of life in residential areas. Residents' complaints have accounted for the first place in environmental complaints. Carrying out noise control and realizing quiet communities have become important parts of urban governance.

[0003] The premise of noise supervision and control is to accurately measure the noise emitted from the boundary of a factory or construction site. In order to measure and monitor the noise emitted from the boundary of a factory or construction site, a noise identification device for noise emission from the boundary of a factory or construction site has been developed. Since the noise identification device for noise emission from the boundary of a factory or construction site is installed outdoors and works continuously for a long time, the microphone used will produce a certain deviation, resulting in reduced monitoring accuracy.

[0004] In order to solve the above problems, it is necessary to design an automatic calibration scheme for the field boundary emission noise identification device. At present, the microphones used in the front-end outdoor microphone array of the field boundary emission noise identification device are piezoelectric sensors. After a period of use, numerical deviations will occur. Under normal circumstances, manual calibration is required using a standard sound source. However, in the case of long-term continuous operation outdoors, manual calibration requires the removal of the microphone from the field boundary emission noise identification device, which is time-consuming and laborious.

[0005] Therefore, in order to solve the problem of numerical deviation after the microphone has been running continuously for a period of time, it is necessary to design a field boundary emission noise identification device with automatic calibration, which can automatically calibrate the microphone at regular intervals and improve the monitoring accuracy of the field boundary emission noise identification device, which has important practical significance. Utility Model Content

[0006] In order to solve the above problems in the prior art, the utility model provides a field boundary emission noise identification device with automatic calibration.

[0007] The technical solution adopted by the utility model to solve this problem is:

[0008] A field boundary emission noise identification device with automatic calibration includes a front-end outdoor microphone array, an electrostatic exciter, an automatic calibration control module and a monitoring terminal host, wherein:

[0009] The front-end outdoor microphone array has a plurality of outdoor microphones and a standard sound source built therein, each of the outdoor microphones is connected to the monitoring terminal host via a first BNC cable, and each of the standard sound sources is connected to the automatic calibration control module via a first self-calibration cable;

[0010] The automatic calibration control module is connected to the electrostatic actuator via a second self-calibration cable and connected to the monitoring terminal host via an RS232 serial port cable;

[0011] The electrostatic actuator is connected to the DAC output interface of the monitoring terminal host through a second BNC cable.

[0012] In one embodiment, the front-end outdoor microphone array is composed of three outdoor microphones, three standard sound sources and a protective device. The standard sound sources are installed one by one on the upper ends of the outdoor microphones and the two maintain a fixed distance.

[0013] In one embodiment, the three outdoor microphones are respectively placed in respective protective shells, two of which are grouped as one, and the other one is grouped as another, and each group of the outdoor microphones shares a rain cap.

[0014] In one embodiment, the protective device includes a wind ball wrapped around the upper outer side of each group of outdoor microphones. The wind ball is a columnar structure with a spherical protrusion formed on the top, which wraps the upper part of the outdoor microphone and the standard sound source.

[0015] In one embodiment, the front-end outdoor microphone array further includes a microphone set fixing box, and the outdoor microphones are all installed on the upper end of the microphone set fixing box.

[0016] In one embodiment, the standard sound source is driven by an electrostatic actuator to produce sound, and the monitoring terminal host outputs a 0.5V 1kHz analog signal to the electrostatic actuator, which then boosts the voltage to the high voltage required by the standard sound source, and then the automatic calibration control module selects to drive the standard sound source to produce sound.

[0017] In one embodiment, the automatic calibration control module is built into the front-end outdoor microphone array.

[0018] In one embodiment, the automatic calibration control module controls one output of the electrostatic actuator to selectively switch to drive one of the three standard sound sources of the front-end microphone array 1 to automatically calibrate one of the outdoor microphones.

[0019] In one embodiment, the automatic calibration control module is controlled by an MCU and communicates with the monitoring terminal host through an RS232 serial port cable. The monitoring terminal host sends commands through the serial port to control the front-end microphone array to perform automatic calibration.

[0020] In one embodiment, the monitoring terminal host outputs a 0.5V 1kHz analog signal to the electrostatic actuator through a DAC, and the electrostatic actuator generates the high voltage current required to drive the standard sound source. The automatic calibration control module then selects and switches to drive the standard sound source to generate a 1kHz standard sound pressure signal. The outdoor microphone collects the standard sound signal, converts it into an electrical signal, and converts it into a digital signal by the DAC of the monitoring terminal host and processes it for automatic calibration.

[0021] In one embodiment, the monitoring terminal host controls the front-end microphone array to perform automatic calibration at regular intervals. The monitoring terminal host sets a specific time to start the automatic calibration process, and automatically calibrates each of the three outdoor microphones of the front-end outdoor microphone array.

[0022] The advantages and positive effects of the utility model are:

[0023] 1. The front-end outdoor microphone array of the utility model includes an outdoor microphone integrated with a standard sound source, which has the function of automatic calibration while not affecting the field boundary emission noise in any direction within the monitoring area.

[0024] 2. The automatic calibration control module in the utility model can use an electrostatic actuator to control the selection of one of the three outdoor microphones for calibration under the control of the monitoring terminal host, thereby reducing the number of electrostatic actuators required and improving the efficiency of automatic calibration.

[0025] 3. The utility model can automatically calibrate the field boundary emission noise identification device at regular intervals with little change to the original monitoring plan, thereby improving the accuracy of field boundary emission noise identification. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The technical solution of the utility model will be further described in detail below in conjunction with the accompanying drawings and embodiments, but it should be understood that these drawings are designed only for the purpose of explanation and are not intended to limit the scope of the utility model. In addition, unless otherwise specified, these drawings are only intended to conceptually illustrate the structural configurations described herein and are not necessarily drawn to scale.

[0027] Figure 1 It is a structural schematic diagram of the utility model;

[0028] Figure 2 is a schematic diagram of the structure of the front-end outdoor microphone array;

[0029] Figure 3 This is the circuit diagram of the automatic calibration control module.

[0030] In the figure: 1-front-end outdoor microphone array; 2-electrostatic actuator; 3-automatic calibration control module; 4-monitoring terminal host; 5-first BNC cable; 6-standard sound source; 7-first self-calibration cable; 8-second self-calibration cable; 9-RS232 serial port cable; 10-second BNC cable; 11-protective device; 12-microphone set fixing box. Implementation

[0031] First of all, it should be noted that the specific structure, features and advantages of the present invention will be specifically described below by way of example, but all descriptions are only for illustration and should not be understood as limiting the present invention in any way. In addition, any single technical feature described or implied in the embodiments mentioned herein, or any single technical feature displayed or implied in the drawings, can still be combined or deleted between these technical features (or their equivalents) to obtain more other embodiments of the present invention that may not be directly mentioned in this document. In addition, in order to simplify the drawings, the same or similar technical features may be marked only in one place in the same drawing.

[0032] In the present utility model, unless otherwise clearly specified and limited, the terms "installation", "setting", "connection", "fixation", "screwing" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined, for ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to the specific circumstances. The present utility model is described in detail below in conjunction with the accompanying drawings. Example

[0033] A field boundary emission noise identification device with automatic calibration includes a front-end outdoor microphone array 1, an electrostatic actuator 2, an automatic calibration control module 3 and a monitoring terminal host 4, wherein:

[0034] The front-end outdoor microphone array 1 has a plurality of outdoor microphones and a standard sound source 6 built therein, each of the outdoor microphones is connected to the monitoring terminal host 4 via a first BNC cable 5, and each of the standard sound sources 6 is connected to the automatic calibration control module 3 via a first self-calibration cable 7;

[0035] The automatic calibration control module 3 is connected to the electrostatic actuator 2 via a second self-calibration cable 8 and connected to the monitoring terminal host 4 via an RS232 serial port cable 9;

[0036] The electrostatic actuator 2 is connected to the DAC output interface of the monitoring terminal host 4 through a second BNC cable 10. The DAC port of the monitoring terminal host 4 outputs a 0.5V 1kHz analog signal to the electrostatic actuator 2, which is then boosted by the electrostatic actuator 2 to the current signal required by the standard sound source 6 to drive the standard sound source to produce sound.

[0037] Taking this embodiment as an example, the device includes a front-end outdoor microphone array 1, which includes three outdoor microphones, specifically composed of a protective device, an outdoor microphone and a standard sound source. The outdoor microphone and the standard sound source are located inside the protective device, and the standard sound source and the outdoor microphone maintain a fixed distance.

[0038] The device also includes an electrostatic actuator 2 for driving the standard sound source to produce sound. The monitoring terminal host outputs a 0.5V 1kHz analog signal to the electrostatic actuator, which then boosts the voltage to the high voltage required by the standard sound source to drive the standard sound source to produce sound.

[0039] The device also includes an automatic calibration control module 3 built into the front-end microphone array. The automatic calibration module is controlled by an MCU and communicates with the monitoring device terminal through the RS232 serial port. The monitoring terminal host sends commands through the serial port to control the selection of one of the outdoor microphones for calibration. It includes an automatic calibration process, in which the monitoring terminal host 4 selects an outdoor microphone for calibration, outputs a 0.5V 1kHz analog signal to the electrostatic actuator through the DAC, and then the electrostatic actuator drives the standard sound source to generate a 1kHz 94dB standard sound pressure signal. The microphone collects the standard sound signal, converts it into an electrical signal, and converts it into a digital signal by the DAC of the monitoring terminal host, calculates the sound pressure, inputs the calibration program, and performs automatic calibration at a fixed time.

[0040] The utility model designs an automatic calibration scheme for a field boundary emission noise identification device, which can realize the use of one electrostatic actuator to control and drive three standard sound sources, select one of the outdoor microphones for automatic calibration, and improve the monitoring accuracy of the field boundary emission noise identification device.

[0041] Taking this embodiment as an example, the front-end outdoor microphone array 1 is composed of three outdoor microphones 1a, 1b, 1c, three standard sound sources 6a, 6b, 6c and a protective device 11. The standard sound sources 6a, 6b, 6c are installed one by one on the upper ends of the outdoor microphones 1a, 1b, 1c and the two are kept at a fixed distance. The three built-in outdoor microphones 1a, 1b, 1c are connected to the monitoring terminal host 4 through three first BNC cables 5a, 5b, 5c, respectively, and the three built-in standard sound sources 6a, 6b, 6c are connected to the automatic calibration control module 3 through three first self-calibration cables 7a, 7b, 7c, respectively. The automatic calibration control module 3 is connected to the electrostatic actuator 2 through a second self-calibration cable 8, and is connected to the monitoring terminal host 4 through an RS232 serial port cable 9. The electrostatic actuator 2 is connected to the DAC output interface of the monitoring terminal host 4 through a second BNC cable 10, and is connected to the standard sound sources 6a, 6b, 6c through the first self-calibration cables 7a, 7b, 7c. The circuit relationship in the automatic calibration control module 3 is as follows: Figure 3 As shown, it is controlled by an MCU and communicates with the monitoring device terminal through the RS232 serial port. The monitoring terminal host sends commands through the serial port and selects one of the outdoor microphones for calibration through a 3-to-1 switch.

[0042] Furthermore, in this embodiment, it can also be considered that the three outdoor microphones 1a, 1b, and 1c are respectively placed in respective protective shells, two of which are grouped as one, and the other one is grouped as one, and each group of the outdoor microphones shares a rain cap.

[0043] Furthermore, in this embodiment, it can also be considered that the protective device 11 includes a wind ball wrapped around the upper outer side of each group of outdoor microphones. The wind ball is a cylindrical structure with a spherical protrusion formed on the top, which wraps the upper part of the outdoor microphones 1a, 1b, 1c and the standard sound sources 6a, 6b, 6c to play a protective role.

[0044] Furthermore, in this embodiment, it can also be considered that the front-end outdoor microphone array 1 also includes a microphone set fixing box 12, and the outdoor microphones 1a, 1b, 1c are all installed on the upper end of the microphone set fixing box 12.

[0045] Furthermore, in this embodiment, it can be considered that the standard sound source 6a, 6b, 6c is driven by the electrostatic actuator 2 to make a sound, and the monitoring terminal host 4 outputs a 0.5V 1kHz analog signal to the electrostatic actuator 2, which is then boosted by the electrostatic actuator 2 to the high voltage required by the standard sound source 6a, 6b, 6c, and then the automatic calibration control module 3 selects to drive the standard sound source 6a, 6b, 6c to make a sound. Specifically: the monitoring terminal host 4 outputs a 0.5V 1kHz analog signal to the electrostatic actuator 2 through the DAC, and the electrostatic actuator 2 generates the high voltage current required to drive the standard sound source 6a, 6b, 6c, and then the automatic calibration control module 3 selects to switch and drive the standard sound source 6a, 6b, 6c to generate a 1kHz standard sound pressure signal, and the outdoor microphones 1a, 1b, 1c collect the standard sound signal, convert it into an electrical signal, and the DAC of the monitoring terminal host 4 converts it into a digital signal and processes it for automatic calibration.

[0046] Furthermore, in the present embodiment, it can also be considered that the automatic calibration control module 3 is built into the front-end outdoor microphone array 1, and the automatic calibration control module 3 controls one output of the electrostatic actuator 2 to select and switch to drive one of the three standard sound sources 6a, 6b, and 6c of the front-end microphone array 1 to automatically calibrate one of the outdoor microphones.

[0047] Furthermore, in this embodiment, it can also be considered that the automatic calibration control module 3 is controlled by an MCU, communicates with the monitoring terminal host 4 through an RS232 serial port cable 9, and the monitoring terminal host 4 sends commands through the serial port to control the front-end microphone array 1 to perform automatic calibration through a 3-to-1 switch.

[0048] Furthermore, in this embodiment, the monitoring terminal host 4 controls the front-end microphone array 1 to perform automatic calibration at a fixed time, and the monitoring terminal host 4 sets a specific time to start the automatic calibration process, and automatically calibrates the three outdoor microphones 1a, 1b, and 1c of the front-end outdoor microphone array 1. The automatic calibration control module 3 can use an electrostatic actuator 2 to control the selection of one of the three outdoor microphones for calibration under the control of the monitoring terminal host 4, thereby reducing the number of electrostatic actuators required and improving the efficiency of automatic calibration.

[0049] The above embodiments describe the present invention in detail, but the above contents are only preferred embodiments of the present invention and cannot be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made within the scope of application of the present invention shall still fall within the scope of the patent coverage of the present invention.

Claims

1. A field boundary emission noise identification device with automatic calibration, characterized in that: It comprises a front-end outdoor microphone array (1), an electrostatic actuator (2), an automatic calibration control module (3) and a monitoring terminal host (4), wherein: The front-end outdoor microphone array (1) has a plurality of outdoor microphones and a standard sound source (6) built therein, each of the outdoor microphones being connected to a monitoring terminal host (4) via a first BNC cable (5), and each of the standard sound sources (6) being connected to an automatic calibration control module (3) via a first self-calibration cable (7); The automatic calibration control module (3) is connected to the electrostatic actuator (2) via a second self-calibration cable (8), and is connected to the monitoring terminal host (4) via an RS232 serial port cable (9); The electrostatic actuator (2) is connected to a DAC output interface of a monitoring terminal host (4) via a second BNC cable (10).

2. The field boundary emission noise identification device with automatic calibration according to claim 1, characterized in that: The front-end outdoor microphone array (1) is composed of three outdoor microphones (1a, 1b, 1c), three standard sound sources (6a, 6b, 6c) and a protective device (11), wherein the standard sound sources (6a, 6b, 6c) are installed one by one on the upper ends of the outdoor microphones (1a, 1b, 1c) and the two are kept at a fixed distance.

3. The field boundary emission noise identification device with automatic calibration according to claim 2 is characterized in that: The three outdoor microphones (1a, 1b, 1c) are respectively placed in respective protective shells, two of which are grouped as one, and the other one is grouped as another, and each group of outdoor microphones shares a rain cap.

4. The field boundary emission noise identification device with automatic calibration according to claim 3 is characterized in that: The protective device (11) comprises a wind ball wrapped around the upper outer portion of each group of outdoor microphones, the wind ball being a columnar structure with a spherical protrusion formed on the top, and wrapping the upper portion of the outdoor microphones (1a, 1b, 1c) and the standard sound sources (6a, 6b, 6c).

5. The field boundary emission noise identification device with automatic calibration according to claim 4 is characterized in that: The front-end outdoor microphone array (1) further comprises a microphone set fixing box (12), and the outdoor microphones (1a, 1b, 1c) are all mounted on the upper end of the microphone set fixing box (12).

6. The field boundary emission noise identification device with automatic calibration according to claim 4 is characterized in that: The standard sound source (6a, 6b, 6c) is driven by an electrostatic actuator (2) to produce sound, and the monitoring terminal host (4) outputs a 0.5V 1kHz analog signal to the electrostatic actuator (2), which is then boosted by the electrostatic actuator (2) to the high voltage required by the standard sound source (6a, 6b, 6c), and then the automatic calibration control module (3) selects to drive the standard sound source (6a, 6b, 6c) to produce sound.

7. The field boundary emission noise identification device with automatic calibration according to claim 6 is characterized in that: The automatic calibration control module (3) is built into the front-end outdoor microphone array (1).

8. The field boundary emission noise identification device with automatic calibration according to claim 7, characterized in that: The automatic calibration control module (3) controls one output of the electrostatic actuator (2) to selectively switch and drive one of the three standard sound sources (6a, 6b, 6c) of the front-end microphone array (1), thereby automatically calibrating one of the outdoor microphones.

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