In this paper, an adaptive coding technique is proposed, namely, adaptive Exp-Golomb codes (AEG), in order to mitigate the efficiency loss due to mismatch.

A number of methods are available for the compression of ECG signals, and the method presented is based on wavelet transform and adaptive coding that can reduce distortion in signal reconstruction with the compression rate being 5-12.

In next mobile communication system to suffice more and more high-speed data service and demand of Qos(quality of service) many new wireless link layer transport technologies are going to be used such as MIMO(multiple input multiple output), OFDM(Orthogonal Frequency Division Multiplexing), channel coding and ACM(adaptive coding modulation) etc.

Fast fractal coding method based on adaptive threshold;

Spread spectrum signals synchronous algorithm based on power spectrum estimation and adaptive threshold;

According to worsened performances of most voice activity detection methods at very low SNR,a new voice activity detection algorithm based on Teager energy operator(TEO) is presented,which can combine speech enhancement technology with Teager energy operator to conduct adaptive threshold judgments.