How to distinguish sounds
We can hear different sounds from different vibrating bodies, which are vibrating:
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Acoustic frequency-The higher the wave frequency, the faster the fluctuation of the air pressure. This sound sounds high-pitched. The slower the fluctuation, the lower the pitch.
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Air pressure level-it is the amplitude of the wave, which determines the intensity of the sound. The greater the amplitude of the sound wave, the greater the intensity of the impact on the eardrum. We can regard this feeling as a high volume.
The working principle of the microphone is similar to that of the human ear. It has a diaphragm, and the surrounding sound waves can cause the diaphragm to vibrate. The signal from the microphone is encoded as an electronic signal and stored on a tape or CD. When this signal is played back in a stereo system, the amplifier transmits it to the speakers, which redefines it as mechanical vibration. The pressure wave generated by the high-quality speaker is exactly the same as the wave originally collected by the microphone. In the next section, we will understand how the speaker completes this process.
