Analog signal encoding in delta modulation circuits using the theory of variable structure systems

The theory of variable structure systems (VSS), and their associated sliding regimes, is proposed as a means of dealing with the problem of analog signal tracking in delta modulation circuits. Classical delta modulation schemes (i.e. analog, continuous-time encoding) are treated from this general viewpoint. The results are easily extendable to modern analog signal encoding (i.e. digital, discrete-time). It is shown that sliding regimes are relevant in the analysis and conceptual design of analog signal tracking devices such as those performing analog signal encoding for transmission over binary communication channels