A New Pulse Modulated Speech Communication System Having a Minimum Duty Cycle

The development at the Navy Electronics Laboratory of a low duty cycle, multichannel pulse modulation communication system is described. The system provides adequate naturalness of speech while maintaining a quantized sampling rate which is proportional to the information bandwidth. First, a general description of the speech processing and reprocessing techniques is given. This includes techniques for generating infinitely clipped signals, and for deriving an optimum sampling rate from these signals. Next is shown how two separate forms of information, amplitude and frequency, are conveyed by a time modulated pulse. Finally, is presented the results of tests conducted through the system.