Abstract
Audio functionality plays a critical role in digital media processing. Audio requires less processing power in general than video processing, it is considered equally important. Recent applications, such as wireless, Internet, and multimedia communication systems have created a demand for high-quality digital audio delivery at low bit rates. Audio coding or compression algorithms are used to obtain compact digital representation of high-fidelity audio signals for the purpose of efficient transmission or storage. This chapter discusses audio coding techniques. Audio codecs are used for source encoding and decoding of audio information. Codecs are designed for two different parameters—sampling rate and bit rate. The sampling rate is the rate of uncompressed input samples; bit rate is the rate of compressed output bit information. Applications, such as wireless and Internet communication systems are designed for lower bit rates.
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