Cordless telephone apparatus having means for synchronizing channel scanning of fixed and portable units
First Claim
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1. A cordless telephone apparatus comprising:
- a fixed unit and a portable unit, each having control means for channel scanning to determine whether or not each of a plurality of channels is engaged, said portable unit being battery-charged in a state where it is attached to said fixed unit;
a connecting line for transmitting and receiving signals between said two control means in a state where said portable unit is attached to said fixed unit; and
means for synchronizing the channel scanning processes of said two control means through said connecting line.
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Abstract
According to the invention, there is provided a cordless telephone apparatus having: a fixed unit and a portable unit, each having a control device for channel scanning to determine whether or not each of a plurality of channels is engaged, the portable unit being battery charged when it is attached to the fixed unit; a connecting line for transmitting and receiving signals between the two control devices when the portable unit is attached to the fixed unit; and a system for synchronizing the channel scanning processes of the two control devices through the connecting line.
47 Citations
17 Claims
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1. A cordless telephone apparatus comprising:
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a fixed unit and a portable unit, each having control means for channel scanning to determine whether or not each of a plurality of channels is engaged, said portable unit being battery-charged in a state where it is attached to said fixed unit; a connecting line for transmitting and receiving signals between said two control means in a state where said portable unit is attached to said fixed unit; and means for synchronizing the channel scanning processes of said two control means through said connecting line. - View Dependent Claims (2, 3, 4)
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5. A cordless telephone apparatus comprising:
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a fixed unit and a portable unit, each having control means for channel scanning to determine whether or not each of a plurality of channels is engaged, said portable unit being battery-charged from said fixed unit through charging connection lines; first and second detector means coupled to said charging connecting lines and included in said fixed unit and portable unit, respectively, for detecting the start of the battery charging of said portable unit; and means responsive to the outputs of said first and second detector means for starting said channel scanning of said fixed unit and portable unit from a predetermined channel. - View Dependent Claims (6, 7, 8)
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9. A method for synchronizing the channel scanning processes of first and second units, comprising the steps of:
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(a) scanning in a prescribed order a plurality of channels at said first and second units to check whether or not each of said plurality of channels is idle; (b) charging the secondary battery of said second unit with power supplied from said first unit; (c) connecting the control sections of said first and second units with a control line during the charging step of said secondary battery; and (d) synchronizing the channel scanning of said second unit with that of said first unit through said control line. - View Dependent Claims (10, 11, 12, 13, 14)
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15. A method for synchronizing the channel scanning processes of first and second units comprising the steps of:
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scanning in a prescribed order a plurality of channels at said first and second units to check whether or not each of said plurality of channels is idle; charging the secondary battery of said second unit with power supplied from said first unit; detecting the start of the charging of said secondary battery at both of said first and second units; and starting the channel scanning of said first and second units from a predetermined channel in response to the detection of said start. - View Dependent Claims (16, 17)
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Specification