CCD adaptive filtering techniques with applications to communication systems

Some CCD variable or adaptive filtering techniques are described, in particular to perform multiple filtering, band-pass analysis, multifrequency-tone receiving and adaptive equilization. A special algorithm is presented in order to compensate for the charge transfer loss which is typical of CCD devices. A structure is in detail described, based on the use of a CCD tapped-delay-line and a microprocessor evaluating the filter coefficients nd and driving a set of MDAC converters. The implementation of a CCD multifrequency-tone receiver using this structure is shown and experimental results are reported.