Telecommunications – Receiver or analog modulated signal frequency converter – Signal selection based on frequency
Patent
1979-05-25
1981-05-19
Birmiel, Howard A.
Telecommunications
Receiver or analog modulated signal frequency converter
Signal selection based on frequency
455 26, H04K 100
Patent
active
042687209
ABSTRACT:
A system is provided for time segment scrambling speech encoding, wherein an internal key code is provided for control thereof. The scrambling and reset units are synchronized by start and reset clock pulses. The scrambling unit can also scramble individual segments by an inversion process in accordance with a second internal key code, such as, for example, time inversion and frequency inversion. A related system for unscrambling scrambled speech transmission and synchronization therefore is set forth as another embodiment of the invention.
REFERENCES:
patent: 3696207 (1972-10-01), Lundin et al.
patent: 3723878 (1973-03-01), Miller
patent: 3909534 (1975-09-01), Majeau et al.
patent: 4100374 (1978-07-01), Jayant et al.
patent: 4133977 (1979-01-01), McGuire et al.
patent: 4171513 (1979-10-01), Otey et al.
patent: 4188580 (1980-02-01), Nicolai et al.
Anderson Bruce
Fowler Vernon J.
Olberg Stirling M.
Birmiel Howard A.
Fisher Fred
GTE Laboratories Incorporated
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