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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 6Homomorphic Signal Processing

6.1 Introduction

Signals that are added together and have disjoint spectral content can be separated by linear filtering. Often, however, signals are not additively combined. In particular, the source and system in the linear speech model are convolutionally combined and, consequently, these components cannot be separated by linear filtering. The speech signal itself may also be convolved with a system response such as when distorted by the impulse response of a transmission channel or by a flawed recording device. In addition, the speech signal may be multiplied by another signal as occurs, for example, with a time-varying fading channel or with an unwanted expansion of its dynamic range. In these cases, ...

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