Cordless parent/slave telephone set with improved sidetone handling
First Claim
1. A cordless telephone set having a parent telephone set and a slave telephone set and having a radio transmitter/receiver executing bidirectional communications between said parent telephone set and said slave telephone set by subjecting an aural signal to digital talk processing, comprising:
- a transformer which is an interface with a line and/or a receiver;
a sidetone level reducing circuit for reducing a level of sidetone from said transformer;
a first talk processing circuit for executing digital talk processing for an aural signal from said transformer or an aural signal received through an antenna of said parent telephone set;
a second talk processing circuit for executing digital talk processing for an aural signal from a slave telephone set microphone or an aural signal received through a slave telephone set antenna;
a delaying circuit for delaying an aural signal from said telephone set microphone by a specified delay time; and
a level reducing circuit for reducing a level of said aural signal from said telephone set microphone according to an output from said delaying circuit;
said specified delay time being set by said delaying circuit according to a time required for digital talk processing in said first talk processing circuit and said second talk processing circuit.
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Accused Products
Abstract
A parent telephone set comprises a transformer, a sidetone level reducing circuit, and a first secret talk processing circuit for executing digital secret talk processing, a counterpart slave telephone set comprises a second secret talk processing circuit for executing digital secret talk processing, a delaying circuit for delaying an aural signal from the slave telephone set microphone by a specified delay time, and a level reducing circuit for reducing the level of output from the second secret talk processing circuit according to the output from the delaying circuit. The specified delay time in the delaying circuit is set according to the time required for digital secret talk processing in the first secret talk processing circuit as well as in the second secret talk processing circuit.
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Citations
12 Claims
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1. A cordless telephone set having a parent telephone set and a slave telephone set and having a radio transmitter/receiver executing bidirectional communications between said parent telephone set and said slave telephone set by subjecting an aural signal to digital talk processing, comprising:
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a transformer which is an interface with a line and/or a receiver; a sidetone level reducing circuit for reducing a level of sidetone from said transformer; a first talk processing circuit for executing digital talk processing for an aural signal from said transformer or an aural signal received through an antenna of said parent telephone set; a second talk processing circuit for executing digital talk processing for an aural signal from a slave telephone set microphone or an aural signal received through a slave telephone set antenna; a delaying circuit for delaying an aural signal from said telephone set microphone by a specified delay time; and a level reducing circuit for reducing a level of said aural signal from said telephone set microphone according to an output from said delaying circuit; said specified delay time being set by said delaying circuit according to a time required for digital talk processing in said first talk processing circuit and said second talk processing circuit. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A cordless telephone set having a parent telephone set and a slave telephone set and having a radio transmitter/receiver executing bidirectional communications between said parent telephone set and said slave telephone set by subjecting an aural signal to digital talk processing,
wherein said parent telephone set comprises: -
a transformer which is an interface with a line and/or a receiver; a sidetone level reducing circuit for reducing a level of sidetone from said transformer; and a first talk processing circuit for executing digital talk processing for an aural signal from said transformer or an aural signal received through an antenna of said parent telephone set; and wherein said slave telephone set comprises; a second talk processing circuit for executing digital talk processing for an aural signal from a slave telephone set microphone or an aural signal received through a slave telephone set antenna; a delaying circuit for delaying an aural signal from said telephone set microphone by a specified delay time; and a level reducing circuit for reducing a level of output from said second talk processing circuit according to an output from said delaying circuit; said specified delay time being set by said delaying circuit according to a time required for digital talk processing in said first talk processing circuit and said second talk processing circuit. - View Dependent Claims (8, 9, 10, 11, 12)
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Specification