Modulation method for modulating airflow sound source and sensorless closed loop

A modulation method and sensor technology, applied in the direction of sensors, sensor components, electrical components, etc., can solve the problems of high quality requirements of the voice coil vibration system, difficult sensor installation, low sensor reliability, etc., and achieve improvement Pronunciation quality and electro-acoustic conversion efficiency, strong anti-interference, low cost effect

Active Publication Date: 2015-07-08
NAT UNIV OF DEFENSE TECH
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Problems solved by technology

Due to the compact structure of the modulated airflow transducer, the voice coil vibration system has high requirements on the quality of the voice coil, it is difficult to install the sensor, and the working environment is harsh, the reliability of the closed-loop modulation of the sensor is low, and the cost is expensive

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  • Modulation method for modulating airflow sound source and sensorless closed loop
  • Modulation method for modulating airflow sound source and sensorless closed loop
  • Modulation method for modulating airflow sound source and sensorless closed loop

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Embodiment Construction

[0037] The technical solution of the present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0038] figure 1 It is a schematic diagram of the structure of a typical modulated airflow sound source. figure 2 Schematic diagram of the voice coil modulation principle for modulating the airflow sound source. figure 1 Among them, 11 is the high-speed air intake inlet, 12 is the modulating airflow annular seam, 13 is the elastic element, 14 is the inner coil of the voice coil, 15 is the permanent magnet, 16 is the voice coil, and 17 is the airflow outlet guide cone. figure 2 Among them, 21 is the diversion cone of the airflow outlet, 22 is the high-speed airflow inlet, 23 is the annular seam of the modulated airflow, 24 is the elastic element, 25 is the supporting wall of the elastic element, 26 is the voice coil, and 27 is the coil wound inside the voice coil. The coil, 28, is a permanent magnet, providing a cons...

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Abstract

The invention relates to the field of acoustic transducer, and provides a modulation method for modulating an airflow sound source and a sensorless closed loop. The modulation method comprises the steps of (1) with sound signals being combined with high-frequency detection signals as an input, driving a voice coil to oscillate through an audio power amplifier, (2) conducting sampling, linear amplification, filtering and orthogonal decomposition to modulated coil current signals to obtain an instantaneous phase of the modulated coil current signals, and (3) according to a correlation model between an immediate movement and the instantaneous phase, obtaining an immediate movement of the voice coil and realizing closed-loop control regulation to the position of the voice coil. The modulation airflow sound source comprises the voice coil, a pure ferromagnetic core, an audio power amplifier and closed-loop control regulator, a current sense resistor, a fine differential amplifier, a band-pass filter, a quadrature demodulator circuit and a processor. Without additional sensor or the structural integrity of a transducer being damaged in the modulation method for modulating airflow sound source and sensorless closed loop, the closed loop is low in modulation cost, high in reliability and strong in anti-interference, and suitable for work in environment such as high temperature, high pressure and high humidity.

Description

technical field [0001] The invention relates to the field of acoustic transducers, in particular to a sensorless closed-loop modulation method for modulating an airflow sound source. Background technique [0002] The modulated airflow sound source is a high-power high-pressure fluid sound source that modulates the high-speed airflow by exciting the vibration of the voice coil. At present, there are two types of airflow sound source modulation methods in the prior art: open-loop modulation and sensor closed-loop modulation. The open-loop modulation method of the modulated airflow sound source means that the instantaneous displacement of the voice coil is not fed back to the audio power amplifier circuit in real time; the closed-loop modulation method of the modulated airflow sound source sensor is to use the displacement sensor to feed back the instantaneous displacement of the voice coil to the power amplifier drive circuit in real time. , to achieve precise control of gas ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04R3/00
Inventor 孙海洋曾新吾龚昌超赵云韩开锋田章福蔡清裕
Owner NAT UNIV OF DEFENSE TECH
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