The audio signal is the frequency and amplitude change information carrier of regular sound waves with voice, music and sound effects. According to the characteristics of sound waves, audio information can be classified into regular audio and irregular sound. Regular audio can be divided into voice, music and sound effects. Regular audio is a continuously changing analog signal that can be represented by a continuous curve called sound waves. The three elements of sound are pitch, intensity and timbre. Acoustic or sinusoidal waves have three important parameters: frequency ω0, amplitude A n, and phase ψn, which determine the characteristics of the audio signal.
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