Radio communication apparatus having common oscillator applied f

Details Radio communication apparatus having common oscillator applied f Radio communication apparatus having common oscillator applied f

1996-03-18

1998-05-26

Barron, Jr., Gilberto

Cryptography

Communication system using cryptography

Frequency shift or inversion

455 86, 455550, H04B 140

Patent

active

057579210

ABSTRACT:
A superheterodyne receiving circuit and a superheterodyne transmitting circuit are provided. A PLL forms a local oscillation signal in the receiving circuit, and a PLL forms a carrier signal in the signal transmitting circuit. A circuit converts digital data into signals suitable for transmission, and an oscillating circuit provides an oscillation signal. A frequency-dividing circuit forms a frequency-division signal of a reference frequency which is supplied to the PLLs by frequency-dividing the oscillation signal circuit, and a frequency-dividing circuit generates a clock signal required in the conversion circuit by frequency-dividing the oscillation signal. A frequency-dividing circuit forms a signal for descrambling the received voice signals which have been scrambled by frequency-dividing the oscillation signal, and a frequency-dividing circuit forms a signal for scrambling the voice signals to be transmitted by frequency-dividing the oscillation signal. In accordance with the invention, the essential circuitry of a cordless telephone set can be formed into a one-chip IC.

REFERENCES:
patent: 4627099 (1986-12-01), Shimakata
patent: 4790009 (1988-12-01), Ishigaki et al.
patent: 5168522 (1992-12-01), Simanis et al.
patent: 5291474 (1994-03-01), Ikonen et al.
patent: 5574985 (1996-11-01), Ylikotila
Abstract of: T. Sato Semiconductors for Cordless Telephones, Mitsubishi Denki Giho, vol. 65, No. 12, pp. 88-94 (1991).
Abstract of: N. Kaiser et al. Silicon-bipolar Chipset for STM-1 and STM-4 Fibre-Optic Transmission Modules, Eur. Inst. Commun. & Networks (1993).

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