Method of and apparatus for interception-protected...

Details Method of and apparatus for interception-protected... Method of and apparatus for interception-protected...

H - Electricity

04

K

325/3

H04K 1/00 (2006.01) H04B 1/66 (2006.01) H04K 1/06 (2006.01)

Patent

CA 1193668

ABSTRACT "A METHOD OF AND APPARATUS FOR INTERCEPTION-PROTECTED FREQUENCY-BAND-COMPRESSED TRANSMISSION OF SPEECH SIGNALS" Sample values (k1 to k6) of a transmitted t.d.m. frame for spectral channels synchronising data (sy) and other speech-characteristics (kp, hf) are obtained and transmitted with pseudo-random timing. Also blank values (x) are provided by a noise signal generator and are introduced in variable numbers (? 10%) into the t.d.m. frame. Trans- mission may be base-band, higher-frequency shifted or indirectly modulated on a carrier. An available transmission channel may be split into upper and lower frequency band- width portions for respective opposite transmission directions to enable two-wire duplex operation. (Fig. 3)

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