Cordless telephone apparatus

Details Cordless telephone apparatus Cordless telephone apparatus

H - Electricity

04

M

H04M 1/00 (2006.01) H04M 1/725 (2006.01)

Patent

CA 2059734

A digital cordless telephone apparatus comprising a micro- processor based battery powered portable handset unit and a microprocessor based stationary base unit which each transmit and receive digital voice data and digital command data to and from one another over multiple RF channel frequencies in the 902-928 MHz band, is disclosed. The user's voice is digitized, scrambled and modulated for transmission and upon reception, the modulated digital voice data signal is demodulated, descrambled and decod- ed. A command data - voice data interface inserts command data packets into the stream of digital voice data prior to transmis- sion and locates and captures command data packets from the incoming stream of received digital data. A silence sequence replaces the captured command data packet such that no audible sound is heard by the user. A link check command signal is also periodically transmitted by the base unit and acknowledged by the handset unit to evaluate the quality of the RF link toward trig- gering an automatic channel change or signaling an out-of-range condition.

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