Pulse position modulation secret communication system

Details Pulse position modulation secret communication system Pulse position modulation secret communication system

1965-04-05

1979-05-01

Birmiel, Howard A.

179 15AP, 325142, 325143, 325 34, H04K 100

Patent

active

041525450

ABSTRACT:
This invention relates to method and apparatus in accordance with which a PPM signal can be encrypted with minimum complexity, involving converting the PPM signal to an encrypted PCM signal, and converting the encrypted PCM signal to a corresponding PPM signal. Only a receiver with a decrypter employing the same modifying code may convert the encrypted PPM to the original PPM intelligence signal.

REFERENCES:
patent: 3104360 (1963-09-01), Lair
patent: 3244808 (1966-04-01), Roberts

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