A homomorphic approach to companding

The procedure of first COMpressing and then exPANDing a signal is known as "companding". In pulse code modulation systems, commonly used in telephone switching networks, samples of an analog speech waveform are encoded as binary words and transmitted. Large dynamic range speech is most efficiently encoded and transmitted if the amplitude of the waveform is compressed before transmission and then expanded at the receiver. The paper describes a homomorphic approach to companding. It reviews and illustrates how these signals are processed and used in speech processing and communication networks.<
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