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A directional sound wave transmitting device and method for repelling birds

A technology of sound wave emission and bird repelling, applied in frequency/direction characteristic devices, sensor parts, sensors, etc., can solve the problem that the emission distance of parametric array speakers is not far enough, and achieve the best bird repelling effect, long propagation distance and wide bandwidth. Effect

Inactive Publication Date: 2018-09-21
SHANDONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, the low-frequency signal in the parametric array speaker accounts for a small proportion of the total transmitted signal energy, and the ultrasound attenuates quickly in the air. These factors make the emission distance of the parametric array speaker not far enough.

Method used

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  • A directional sound wave transmitting device and method for repelling birds
  • A directional sound wave transmitting device and method for repelling birds
  • A directional sound wave transmitting device and method for repelling birds

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Embodiment Construction

[0036] Below in conjunction with accompanying drawing and specific embodiment the present invention is described in further detail:

[0037] Such as figure 1 As shown, a directional sound wave emission device for driving birds is composed of four parts: a low-frequency signal processing unit, a signal modulation unit, an audio power amplifier and a loudspeaker array.

[0038] The low-frequency signal processing unit includes a low-pass filter, an amplitude normalization module, a modulation ratio module, a level adjustment module and a square root module, and its input signal x(t) is a natural enemy of birds or other sound signals that make birds fear, Located in the lower frequency band of the audio range. First, the low-pass filter performs low-pass filtering on the input low-frequency signal x(t) to obtain the low-frequency signal x 1 (t), where the boundary frequency F of the low-pass filter p less than the carrier frequency F c ;Secondly, the amplitude normalization m...

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Abstract

The invention discloses a directional sound wave emitting device and method for driving birds, belonging to the field of electroacoustic technology, comprising a low-frequency signal processing unit, a signal modulation unit, an audio power amplifier and a loudspeaker array, and the low-frequency signal processing part includes a low-pass filter , modulation ratio, level adjustment, square root and other modules, the input signal is bird natural enemies or other sounds that make birds afraid, located in the lower frequency band of the audio range; the signal modulation part includes modules such as audio carrier generator and multiplier , the frequency of the audio carrier signal takes the higher frequency band of the audio range; the modulated signal is equal to the product of the carrier signal and the low-frequency signal, driven by the audio power amplifier and sent out through the speaker array to generate a sound beam. The sound wave beam generated by the invention has the advantages of long action distance, high sound wave energy utilization efficiency, convenient parameter adjustment and the like.

Description

technical field [0001] The invention belongs to the field of electroacoustic technology, and in particular relates to a directional sound wave emitting device and method for driving birds. Background technique [0002] A parametric array speaker is a speaker that can direct audio signals. It modulates the audio electrical signal, that is, the modulation signal, on the ultrasonic carrier, and the audio signal is the envelope of the modulated signal. Then the modulated signal is converted into an acoustic signal by the ultrasonic transducer array and emitted. Due to the nonlinear effect of air on sound waves, the audio signal modulated on the ultrasonic carrier can be demodulated in the air. The ultrasound emitted by the ultrasonic transducer array has super directivity, so the audio sound signal is continuously demodulated along the emission direction to form an audio sound source, which is called a parametric array (ParametricArray). Due to the combined effect of these au...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04R1/34H04R3/00
CPCH04R1/34H04R3/00
Inventor 赵洪亮王彦何冬冬王森
Owner SHANDONG UNIV OF SCI & TECH