H - Electricity – 04 – M
Patent
H - Electricity
04
M
379/11
H04M 1/73 (2006.01)
Patent
CA 1256225
COMPUTER-CONTROLLED CORDLESS TELEPHONE Abstract A computer-controlled cordless telephone system having a base unit and a handset unit provides for increased functionality in communications between the base unit and the handset unit, and also provides a controlled power- up/power-down mode of operation for the handset unit. Increased functionality is achieved by employing a message format for control signals transmitted between the base unit and the handset unit in the form of frequency shift keyed (FSK) signals which include a data field. This data field may be in the form of either opcode data or digit data, thereby allowing for many different commands or functions. Power to a computer (10), a receiver (12) and certain other selected circuitry (11) in the handset unit is controlled to minimize power consumption when the handset unit is in an out-of-cradle-and-standby state. Power to other nonessential circuitry in the handset unit is turned completely off during this state. The handset unit automatically turns on to a full operating mode from the alternating power-up/power-down mode in response to events such as (1) a user depressing a key on the keypad (13) of the handset unit for either initiating a telephone call or paging the base unit, and (2) the base unit detecting an incoming ringing signal on the telephone lines.
528398
Becker William R.
Boyd James J. III
Clifford William J.
Newland Paul B.
American Telephone And Telegraph Company
Kirby Eades Gale Baker
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