Title :
A theoretical model for time code modulation
Author :
Kalogiros, Dimitris ; Stylianakis, Vassilis
Author_Institution :
Lab. of Wire Commun., Patras Univ., Greece
Abstract :
The traditional waveform coding techniques for digital communication systems convert the original analog input signal into a digital bit stream using uniform sampling in the time domain, i.e. PCM, DM, ADPCM. We propose the time code modulation (TCM) technique as an alternative coding scheme, where information is extracted from the signal, only at the time instants when necessary. This results in a variable sampling rate, where its mean value is significantly less than the Nyquist rate. In addition we suggest a general theoretical model for TCM and we present simulation results for various implementations of TCM coders and decoders. A theoretical estimation of SNR vs. sampling rate performance is also presented
Keywords :
adaptive modulation; bandlimited signals; decoding; delta modulation; pulse code modulation; signal sampling; ADPCM; DM; Nyquist rate; PCM; SNR; TCM coders; TCM decoders; analog input signal; band-limited signals; digital bit stream; digital communication systems; finite energy signals; mean value; sampling rate performance; simulation results; theoretical model; time code modulation; time domain uniform sampling; variable sampling rate; waveform coding; Decoding; Delta modulation; Digital communication; Frequency; Laboratories; Modulation coding; Phase change materials; Sampling methods; Speech; Wire;
Conference_Titel :
Acoustics, Speech, and Signal Processing, 1999. Proceedings., 1999 IEEE International Conference on
Conference_Location :
Phoenix, AZ
Print_ISBN :
0-7803-5041-3
DOI :
10.1109/ICASSP.1999.760623
