Secure television system

Details Secure television system Secure television system

1974-08-05

1976-02-03

Wilbur, Maynard R.

Telegraphy

Systems

Simplex-reversing periodic

178 56, 179 15BT, 325308, H04N 144

Patent

active

039365948

ABSTRACT:
A secure system for television transmission wherein a television signal is transmitted on one frequency channel and a composite high fidelity stereophonic audio signal is transmitted on a separate unrelated frequency channel. Unauthorized reception of the audio portion of the signal is prevented by using non-standard multiplex transmission and by transmitting the audio signal in a frequency band which is preferably non-receivable by a standard television or FM receiver.

REFERENCES:
patent: 3046329 (1962-07-01), Reesor
patent: 3388214 (1968-06-01), Eilers et al.
patent: 3860873 (1975-01-01), Ringstad
Halstead et al., Journal of Audio Engineering Soc., 1-1962, Vol. 10, No. 1, pp. 16-22.
Numaguchi et al., NHK Laboratories Note, No. 132, 2-1970, pp. 2-29.

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