EXPANSION PART RESPONSE PROCESSING FOR ANALOG SIGNAL CIPHERING AND SIMILAR OPERATION

摘要

Partial response signal processing is applied to samples of an analog signal quantized in an amplitude range having a sufficient number of levels that a sample amplitude error of a small percentage of the total levels of the range is not readily perceptible to the human auditory function and that it exhibits tolerable quantizing noise. Samples received into the processing in a transmitting station are sample masked for privacy enciphering. Complementary processing is employed for a receiving station.