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Discrete-Time Speech Signal Processing: Principles and Practice by Thomas F. Quatieri - Massachusetts Institute of Technology Lincoln Laboratory

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Chapter 12Speech Coding

12.1 Introduction

We define speech coding as any process that leads to the representation of analog waveforms by sequences of binary digits (i.e., 0’s and 1’s) or bits. Although high-bandwidth channels and networks are becoming more viable (as with fiber optics), speech coding for bit-rate reduction has retained its importance. This is due to the need for low rates with, for example, cellular and Internet communications over constrained-bandwidth channels, and with voice storage playback systems. In addition, coded speech, even at high bit rates, is less sensitive than analog signals to transmission noise and is easier to error-protect, encrypt, multiplex, and packetize. An example of speech coding in a digital telephone ...

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