Audio signal definition

1. What is meant by audio signal?
2. What is the function of an audio signal?
3. What does an audio signal contain?

What is meant by audio signal?

Audio signals are the representation of sound, which is in the form of digital and analog signals. Their frequencies range between 20 to 20,000 Hz, and this is the lower and upper limit of our ears. Analog signals occur in electrical signals, while digital signals occur in binary representations.

What is the function of an audio signal?

Audio signal processing is at the heart of recording, enhancing, storing and transmitting audio content. Audio signal processing is used to convert between analog and digital formats, to cut or boost selected frequency ranges, to remove unwanted noise, to add effects and to obtain many other desired results.

What does an audio signal contain?

Audio signals include speech but also music and all types of sounds. On a compact disc, the audio signal is limited to a maximum frequency of 20 kHz. It is sampled at 44.1 kHz and each sample is coded on 16 bits. The bit rate of the resulting PCM code is 706 kb/s.