Patent ID: 6266418
Filing Date: 2001-07-24
Classification: H04L

Abstract:
An encryption device for a telephone having a handset and a base unit, comprising:a handset interface that receives analog output signals from the handset;a first converter that converts the analog output signals into digital output signals;a single digital signal processor comprising a compressor that compresses the digital output signals, a key manager that generates first key material for encrypting the digital output signals, an encryptor that encrypts the digital output signals based on the first key material, and a modulator that modulates the encrypted digital output signals;a second converter that converts the encrypted digital output signals into encrypted analog output signals;a host interface that receives the encrypted analog output signals from the second converter, and forwards the encrypted analog output signals to the base unit; anda gain adjustment circuit coupled to the host interface that automatically adjusts a signal level of the analog output signals to be compatible with the base unit.