The Shangqiu conference sound Monopoly special anti-noise directional the throat vibrating type surface-mount microphone and its principles microphone, also known as the microphone, pickup, microphone, MIC, a sound energy is converted to electrical energy devices. According to the different structure, can be divided into the moving coil, crystal, ribbon, condenser, carbon particles and other kinds; produce voltage action principle, can be divided into two types, constant speed and constant amplitude type. Moving elements of the constant velocity microphone output voltage is proportional to its speed. When the intensity of the incident acoustic waves with voice frequency change, the moving speed of movement of the element in the use of the band is constant. Type of microphone, dynamic mics and ribbon microphones. Constant amplitude microphone output voltage proportional to the amplitude of the displacement of the moving element. When the intensity of the incident sound wave is constant, the displacement amplitude of the moving element is unchanged, its electromotive force generated in the use of the band unchanged. Kind of microphone, common crystal microphone and condenser microphone. The Shangqiu meeting audio monopoly phone Jiaming Yang 1503 +71780 +75 QQ2579114209 the microphone diaphragm force nature, can be divided into two types of pressure and differential pressure. The moving element of the pressure microphone only side in contact with the acoustic contact with the other side is a constant atmospheric pressure in the closed box. In order to keep the cassette pressure is equal to the atmospheric pressure, the back of the cartridge to open a small hole to be balanced. Common moving coil, crystal, capacitive microphone belong to this category. Pressure-difference microphone, a moving element on both sides, and are subject to the role of the acoustic wave. Since the sound source is different from the both sides of the distance the acoustic waves spread to both sides of the time there are front and rear, causing the phase difference of the acoustic wave, which makes the sound waves by the instantaneous pressure on both sides of the moving element is not the same, and thus so that the occurrence of vibration. The ribbon microphone Common belong to this category. The Shangqiu meeting audio monopoly phone Jiaming Yang 1503 +71780 +75 QQ2579114209 communication devices commonly used to the type of microphone is generally crystal microphone and condenser microphone, will be used in a dedicated environment noisy or special occasions, such as directional jets vibration or surface-mount products. The following discusses electrical indicators and the structure of these types of microphones. Piezoelectric crystal microphone, also known as the piezoelectric microphone, it is made of crystal piezoelectric effect, chemical materials potassium sodium tartrate and barium titanate crystals have a strong effect. When under pressure on both sides of the crystal, the sides between the positive and negative charges, generating an electromotive force in a certain direction: when the stress by the opposite direction, the crystal is produced on both sides with opposite charge pressure and the electromotive force. When the crystal by alternating the role of the sonic audio electromotive force. Shangqiu the conference sound Monopoly phone Jiaming Yang 1503 +71780 +75 QQ2579114209