Abstract: An aqueous polymer emulsion latex is claimed composed of particles comprising a vinyl polymer and a surfactant containing at least one hydrophobic moiety and at least one hydrophilic moiety and also carrying silicon moieties and amido functionalities. Also claimed are coating compositions containing the aqueous polymer emulsion latex, processes for preparing the aqueous polymer emulsion latex wherein ethylenically unsaturated monomers are polymerized in the presence of a surfactant containing a silicon moiety and amido functionality, and substrates carrying a coating composition containing the aqueous polymer emulsion latex.

Abstract: An adaptive delta modulator employs an additional feedback loop to produce a more accurate estimate of the input signal. The delta modulated bit stream is applied to a filter having variable filter characteristics such as bandwidth, the output of the filter being combined with the signal estimated by the prior art adaptive delta modulator. The characteristics of the incoming signal, such as bandwidth, are determined by examining the prior art estimated signal, and the filter characteristics of the additional feedback loop are varied in accordance therewith.