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Low-power acoustic proximity alarm device and alarm method based on sound field perception

An alarm device, a technology of proximity alarm, applied in the direction of alarm, anti-theft alarm, mechanical vibration actuation of anti-theft alarm, etc., can solve the problem of high power consumption, achieve low power consumption, strong penetration, strong concealment Effect

Active Publication Date: 2021-11-12
JIANGSU UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the commonly used acoustic proximity alarm device detects the target by continuously sending out detection sound waves, and the power consumption is relatively large.

Method used

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  • Low-power acoustic proximity alarm device and alarm method based on sound field perception
  • Low-power acoustic proximity alarm device and alarm method based on sound field perception
  • Low-power acoustic proximity alarm device and alarm method based on sound field perception

Examples

Experimental program
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Effect test

Embodiment 1

[0025] The invention discloses a low power consumption acoustic proximity alarm device based on sound field perception, such as figure 1 As shown, it includes: speaker 1, sound pressure sensor 2, preamplifier 3, phase correction unit 4, power amplifier 5;

[0026] Wherein the sound pressure sensor 2 is installed on the vibrating membrane of the loudspeaker 1 to obtain the mechanical vibration of the loudspeaker vibrating membrane; the output signal of the sound pressure sensor 2 is connected to the input end of the preamplifier 3, and the signal output by the preamplifier 3 is phase corrected After the unit 4 is calibrated, it is used as the input of the power amplifier 5, and the output end of the power amplifier 5 is connected to the input of the speaker 1;

[0027] The values ​​of the gain A of the preamplifier and the phase offset Δp of the phase correction unit are: when the alarm device does not generate self-excitation, the gain A takes the maximum value.

[0028] In t...

Embodiment 2

[0031] Adopt the alarm method of the low power consumption acoustic proximity alarm device in embodiment one, such as figure 2 shown, including the following steps:

[0032] S11. Setting the gain A of the preamplifier to a maximum value;

[0033] S12. Adjust the phase offset Δp of the phase correction unit so that sin(Δp)·A=1, and Δp is a small amount at this time;

[0034] S13. When a target is close to the alarm device, the feedback of the sound field adds a phase offset p' to the alarm device, p'>>Δp, so that sin(Δp+p')·A>1, the The alarm device automatically activates the alarm sound.

Embodiment 3

[0036] Adopt the alarm method of the low power consumption acoustic proximity alarm device in embodiment one, such as image 3 shown, including the following steps:

[0037] S21, increasing the gain A of the preamplifier to make the alarm device self-excited;

[0038] S22. Adjust the phase offset Δp of the phase correction unit, so that the alarm device forms negative feedback and does not generate self-excitation;

[0039] S23. Repeat steps S21 and S22 until the gain of the preamplifier reaches the maximum and the alarm device does not generate self-excitation. At this time, sin(△p)·A=1, and △p is a smaller amount;

[0040] In order to facilitate adjustment, the gain of the preamplifier in step S21 is increased by ΔA each time, and ΔA is a small constant.

[0041] S24. When a target is close to the alarm device, the sound field feedback adds a phase offset p' to the alarm device, p'>>△p, ​​so that sin(△p+p')·A>1, the alarm device The alarm sounds automatically.

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Abstract

The invention discloses a low-power acoustic approach alarm device and alarm method based on sound field perception. The alarm device shown includes: a speaker, a sound pressure sensor, a preamplifier, a phase correction unit, and a power amplifier; the sound pressure sensor is installed On the vibrating membrane of the loudspeaker, it is used to obtain the mechanical vibration of the vibrating membrane of the loudspeaker; the output signal of the sound pressure sensor is connected to the input end of the preamplifier, and the signal output by the preamplifier is corrected by the phase correction unit and used as the power amplifier Input, the output end of the power amplifier is connected to the input of the loudspeaker; the value of the gain A of the preamplifier and the phase offset Δp of the phase correction unit is: the gain A is taken under the condition that the alarm device does not generate self-excitation maximum value. The device does not need to emit detection sound waves when no target is approaching, so the power consumption is extremely low, and it can be used in occasions that are sensitive to power consumption and require long-term monitoring.

Description

technical field [0001] The invention belongs to the technical field of acoustic target detection, and in particular relates to an approach alarm device and an alarm method based on sound field perception. Background technique [0002] Proximity alarm devices are usually used to solve the application scenarios that need to maintain a safe range around the equipment, and send an alarm when other objects enter the safe range. The acoustic proximity alarm system uses the influence of the target on the sound propagation to detect the intrusion target. At the same time, when the target approaches, it can emit strong sound waves to warn and drive the intrusion target. It can be used to warn unknown intruders and avoid unnecessary damage and loss. [0003] At present, the commonly used acoustic proximity alarm device detects the target by continuously sending out detection sound waves, and consumes a lot of power. Contents of the invention [0004] Purpose of the invention: Aimi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G08B3/10G08B13/16
CPCG08B3/10G08B13/1672Y02D30/70H04R1/02G01L9/0008
Inventor 何呈尚靖翔李婷靳宇航张森郭家煜胡天杨
Owner JIANGSU UNIV OF SCI & TECH
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