Microphone and its Functions - QS Study
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Microphone and Speaker Microphone is orally known as mic. In a big meeting or program, a speaker delivers his speech in front of an electronic device which is known as microphone or mic. Microphone converts sound into an electric signal. The audience can hear it loudly through a loud speaker. Because the speaker transforms the electric signal of microphone into sound. Perhaps you will have seen the use of microphone and speaker in various ceremonies of your school. Both microphones and speakers are found in tape-recorder, VCR etc.

Functions: We have already said that microphone is such a device that changes sound wave into electrical audio wave or signal. The frequency and relative amplitude of the electrical audio signal remain the same as that of the sound wave. There is a moving coil and a thin metallic sheet named diaphragm in the microphone. When a person speaks through a microphone, the diaphragm vibrates by the sound wave.

Diaphragm is that part of the microphone which is designed to transform the vibration of sound into electricity. The vibration of different types of sounds vibrates the diaphragm. differently. This vibration makes the diaphragm move to and fro in the magnetic field. As a result, alternating electric current is induced in the moving coil. Thus microphone converts the sound energy into electrical energy. This is called audio signal. Having amplified, this electric audio signal can be transferred to a long distance through a telephone line or radio So microphone plays a vital role in television and radio broadcasting, recording and telephone.