TCD data compression technology based on DCT and MWT

A novel Doppler signal compression technology based on DCT and multiple wavelet transform (MWT) is proposed in this paper. Firstly, TCD audio signal is transformed by DCT. Then the DCT coefficients are transformed by MWT. The wavelet coefficients are used as characteristic data of the original signals, which can be saved or transmitted in the future. The original signals are restored by reverse DCT transform and reverse MWT. Changes in the spectrogram and power spectral density are used as the yardstick for compression. Without losing useful information, high compression ratio is achieved by our compression method. Experimental results show that the TCD data compression technology presented has the advantages of high compression ratio and less loss of useful information compared with other approaches.