Introduction to audio signals
The audio signal is (Audio) a frequency and amplitude change information carrier of regular sound waves with voice, music and sound effects. Audio information can be classified into regular audio and irregular sound according to the characteristics of sound waves. The 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 a sound wave. The three elements of sound are tone, intensity, and tone. Sound waves or sine waves have three important parameters: frequency ω0, amplitude A n and phase ψn, which determine the characteristics of the audio signal.