Hybrid-pulse coding (HPCM) is a method of coding a baseband signal into a moderately wideband channel in order to improve the noise performance of signal-processing and transmission systems. Previous ...

Analog transmission is not particularly efficient. When the signal-to-noise ratio of an analog signal deteriorates due to attenuation, amplifying the signal also amplifies noise. Digital signals are ...

A method is described of coding baseband signals for processing or transmission through channels which require noise improvement but have insufficient available bandwidth to support wide-band FM or ...