Scrambling and descrambling circuit for a cordless telephone

Details Scrambling and descrambling circuit for a cordless telephone Scrambling and descrambling circuit for a cordless telephone

1996-10-21

1999-11-23

Hayes, Gail O.

Cryptography

Communication system using cryptography

Frequency shift or inversion

380 40, 455306, 455465, 455565, H04K 104, H04B 110, H04Q 724, H04Q 732

Patent

active

059914165

ABSTRACT:
A scrambling and a descrambling circuit for cordless telephone provides a higher security level than current phone scrambling circuitry. The higher security level is accomplished by separating an audio signal into low and high frequency bands. The frequency bands are selectively inverted or non-inverted during scrambling and descrambling according to common selection conditions. The processed signals are mixed into an overall mixed signal. The overall mixed signal is selectively inverted or non-inverted during scrambling and descrambling according to a common selection condition to increase the phone's transmission security level.

REFERENCES:
patent: 3886313 (1975-05-01), Branscome et al.
patent: 3909534 (1975-09-01), Majeau et al.
patent: 4081831 (1978-03-01), Tang et al.
patent: 4160875 (1979-07-01), Kahn
patent: 4195202 (1980-03-01), McCalmont
patent: 4278840 (1981-07-01), Morgan et al.
patent: 4773092 (1988-09-01), Huang
patent: 5003598 (1991-03-01), Kunstadt
patent: 5058159 (1991-10-01), Quan
patent: 5065430 (1991-11-01), Torii et al.
patent: 5278907 (1994-01-01), Snyder et al.
patent: 5471531 (1995-11-01), Quan
patent: 5528692 (1996-06-01), Hester et al.

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