Telephonic communications – Substation or terminal circuitry – For loudspeaking terminal
Reexamination Certificate
2006-05-16
2006-05-16
Tsang, Fan (Department: 2646)
Telephonic communications
Substation or terminal circuitry
For loudspeaking terminal
C379S388030, C379S388050, C379S390010
Reexamination Certificate
active
07046792
ABSTRACT:
The amplitudes of a signal on the microphone input of a telephone and a signal on the line input of the telephone are compared with each other and with two thresholds. The comparisons are sampled and the samples control an up-down counter. The count in the counter is compared with two thresholds and the results of the comparisons are used to control at least two accumulators. A first accumulator counts consecutive comparisons having the same result and a second accumulator counts up or down in accordance with the comparisons. The counts in the first and second accumulators are logically analyzed to determine whether to receive or transmit. A plurality of samples defines a window, at the end of which the up-down counter is reset. The accumulators store data from a plurality of windows.
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Downey Harold
Fong Judy Mae
Harrow Scott E.
Acoustic Technologies Inc.
Singh Ramnandan
Tsang Fan
Wille Paul F.
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