Quantized non-synchronous clipped speech multi-channel coded communication system

摘要

1. A quantized nonsynchronous clipped speech multi-channel coded communications network comprising a multiplicity of transmitter terminals and receiver terminals; each of said transmitter terminals comprising a multiplicity of audio processing sections, including input means for coupling a composite waveform thereto, pre-emphasis means for generating crossover points corresponding to amplitude excursions in the input composite waveform, clipper means operatively receiving the output of said pre-emphasis means for infinitely clipping the composite waveform thereby removing the amplitude portion and leaving the frequency information, pulse generating means operatively coupled to the output of said clipper means and receiving the output of said clipper means for generating output pulses corresponding to the zero crossover points in the infinitely clipped waveform; a multiplicity of encoding sections corresponding to the audio processing sections, including gate generator means operatively receiving the output of said pulse generating means for generating gate pulses corresponding to said output pulses; a timing unit including, OR circuit means operatively coupled to said gate generating means and receiving pulses therefrom, sampling means for generating pulses corresponding to a desired sampling rate, coincidence means operatively coupled to the output of said sampling means and said OR circuit means for generating an output pulse when pulses from said OR circuit means and said sampling means coincide therein, channel coding means comprising a delay line operatively receiving output pulses from said coincidence means for generating a start stop and channel pulses corresponding to desired channel codes; second coincidence circuit means in said channel unit operatively coupled to said channel coding means and said gate generating means for generating an output pulse when pulses from said gate generating means and said channel coding means coincide therein; and transmitting means operatively coupled to said channel coder means and said second coincident circuit means for receiving start stop pulses from said channel coding means and output pulses from said second coincidence circuit means corresponding to channel codes and propagating pulse trains therefrom; each of said receiver terminals comprising; receiver means for receiving and detecting trains of pulses; channel decoder means for receiving said detected pulse trains, a multiplicity of channel coincidence means operatively coupled to the output of said channel decoder means for generating an output pulse when start stop and channel pulses are coincident therein; audio restorer means corresponding to said channel coincidence means including, flip-flop means operatively receiving output pulses from said channel coincidence means for generating a substantially square waveform in the output thereof, and integrator means receiving the output of said flip-flop and producing a waveform therefrom approximating said original composite waveform.