CHAPTER 11Low Bit-Rate Coding: Codec Design

In the view of many observers, compared to newer coding methods, linear pulse-code modulation (PCM) is a powerful but inefficient dinosaur. Because of its gargantuan appetite for bits, PCM coding is not suitable for many audio applications. There is an intense desire to achieve lower bit rates because low bit-rate coding opens so many new applications for digital audio (and video). Responding to the need, audio engineers have devised many lossy and lossless codecs. Some codecs use proprietary designs that are kept secret, some are described in standards that can be licensed, while others are open source. In any case, it would be difficult to overstate the importance of low bit-rate codecs. Codecs ...

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