Automatic channel selection system for a cordless telephone

Details Automatic channel selection system for a cordless telephone Automatic channel selection system for a cordless telephone

1993-06-10

1995-06-27

Kuntz, Curtis

Telephonic communications

Audio message storage, retrieval, or synthesis

379 62, 455 332, H04M 1100

Patent

active

054286697

ABSTRACT:
In a cordless telephone set, a single RF communications channel selection switch, which may be mounted on either of the base unit and handset unit, selects the frequency for the unit to which it is mounted. The other unit of the base unit and handset unit selects alternate frequencies in response to a series of unacknowledged communications, until it receives an acknowledgement on a particular channel. After receiving an acknowledgement, an indication of the current RF communications channel is stored in memory. If no acknowledgement is received after trying all channels, then the original RF communications channel is selected.

REFERENCES:
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patent: 4706274 (1987-11-01), Baker et al.
patent: 4768219 (1988-08-01), Yamagata et al.
patent: 4783780 (1988-09-01), Alexis
patent: 4894856 (1990-01-01), Nakanishi et al.
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patent: 5237603 (1993-08-01), Yamagata et al.
patent: 5239676 (1993-08-01), Strawczynski et al.
Southwestern Bell, "Freedom Phone", The Sharper Image, Oct. 1986.
Panasonic, "Operating Instructions", Cordless phone KX-T3000, Sep. 23, 1988.
Sony, "Cordless Telephone Operating Instructions SPP-75".

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