Recovery synchronization in ANS-DM demodulator

摘要

Adaptive Non-uniform Sampling Delta Modulation (ANS-DM) is one of the waveform coding techniques, where a sampling instant and a quantization step size are adopted. The ANS-DM modulator produces an output binary stream, that caries information about signal and includes necessary information of coder parameters (sampling instant and quantization step). In demodulator this values have to be recovered for proper signal reconstruction. To date, no systematic investigation that considered signal decoding of the delta systems with sampling instant and step size adaptation were extensively analyzed. In the paper the analytical analysis of a parasitic signal oscillations in the reconstructed signal, as a consequence of the recovery synchronization process in ANS-DM demodulator, have been discussed. Drowned conclusions allow improving the quality of received signal transmitted over ANS-DM system in presence of noises in transmission channels.