Waveform coding using time code multiplexing

Time code multiplexing (TCM) is composed of an encoder and a decoder. The encoder transmits the quantized time intervals corresponding to the time at which the input signal passed through uniformly spaced amplitude levels. The decoder reconstructs the signal by using a sin(x)/x convolution in the amplitude instead of time domain. Even though the channel bit stream is variable rate, TCM systems can be effectively used with packet switched voice/data networks of today´s technology. The Nyquist rate which exists for bandlimited uniform time sampling systems has a parallel Nyquist rate for uniform amplitude sampling systems. However, TCM offers the advantage of being able to change the input signal bandwidth and therefore the minimum required sampling rate. TCM data results are discussed showing SNR vs. bit rate performance