音頻信號光反射調(diào)制的激光傳輸系統(tǒng)研制
[Abstract]:Due to the important role of audio signal in information transmission, the detection of audio signal is paid more attention. At present, the commonly used methods of audio signal detection are microphone detection and laser vibration detection. The detection of microphone requires that the distance between the audio signal and the microphone should not be too far, and there must be no blocking between the audio signal and the microphone, otherwise, the detection effect will be greatly reduced. Therefore, when the sound source is far from the detection end or has a thin wall object as a barrier, laser vibration detection method is needed to detect the sound source. Because the application scene of this system is based on the distance and there is an occlusion between the sound source and the detecting end, the laser vibration measurement method is adopted. At present, the commonly used laser vibration measurement techniques include laser Doppler reference light vibration measurement, heterodyne Doppler vibration measurement, holographic interferometry and light reflection modulation vibration measurement. The laser Doppler technique can not measure the random vibration because it can not distinguish the vibration direction. The heterodyne Doppler vibration measurement technique and the holographic interferometry technique overcome the above shortcomings, but both of them adopt the interference method. Therefore, the stability of optical path is strict, and the system is complex when it is used in interference, especially in outdoor environment. The method of light reflection modulation is used to measure random vibration, and the requirement of optical path stability is lower than that of interference, and the complexity of the system is also reduced. Therefore, the system adopts the light reflection modulation vibration measurement technology combined with the application requirements. In this paper, a laser transmission system with optical reflection modulation of audio signal is developed. The design of laser transmitting system and receiving system is adopted, which greatly enhances the convenience and practicability of the system. After the audio signal is detected and stored, the speech enhancement of the audio signal with noise is carried out. The processed audio signal has good clarity and intelligibility. The main work of this paper is summarized as follows: (1) the design and implementation of the laser transmission system of audio signal and optical reflection modulation is completed, and the audio signal detection is realized when the sound source and detection device are occluded. (2) testing and experiment of the system are carried out, including: laser performance test, such as spot size, divergence angle and laser stability, system parameter test, such as detection distance, sensitivity and frequency response range; The detection of speech signals includes relatively easily recognizable speech signal numbers 1-10 and more difficult to recognize Chinese utterances. (3) speech enhancement processing of the detected speech signals with noise is completed. The effect of speech enhancement is evaluated by MOS score method and comparison of signal to noise ratio before and after processing, and the result is good. Through the work of this paper, the method and reference of detecting audio signal by laser reflection mode are provided, which is of certain significance.
【學(xué)位授予單位】:電子科技大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2017
【分類號】:TN249
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