Telephonic communications – Audio message storage – retrieval – or synthesis
Patent
1986-02-21
1988-03-15
Lev, Robert
Telephonic communications
Audio message storage, retrieval, or synthesis
455127, H04Q 704
Patent
active
047318147
ABSTRACT:
A computer-controlled cordless telephone system having a base unit and a dset 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, a receiver and certain other selected circuitry 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 no the keypad of the handset unit for either initiating a telephone calls or paging the base unit, and (2) the base unit detecting an incoming ringing signal on the telephone lines.
REFERENCES:
patent: 4039760 (1977-08-01), Gregory et al.
patent: 4574163 (1986-03-01), Zato
Becker William R.
Boyd, III James J.
Clifford William J.
Newland Paul B.
American Telephone & Telegraph Company AT&T Information Systems Inc.
Lev Robert
Williamson Samuel R.
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