Telecommunications – Transmitter and receiver at same station – Radiotelephone equipment detail
Reexamination Certificate
2007-05-01
2007-05-01
Trinh, Sonny (Department: 2687)
Telecommunications
Transmitter and receiver at same station
Radiotelephone equipment detail
C455S063100, C455S067130, C379S406010
Reexamination Certificate
active
10477278
ABSTRACT:
In accordance with a first aspect of the present invention there is provided a telephone apparatus including a transmitter portion and a receiver portion, an input transducer for converting input audio signals into electrical signals, a connectable input link between the input transducer and the transmitter portion to deliver when connected an input electrical signal to the transmitter portion to be transmitted by the transmitter portion, an output transducer for converting an output electrical signal into an audio signal and a connectable output link between the receiver portion and the output transducer for delivering when connected an output signal to the output transducer, optionally an echo cancellation circuitry portion adapted to sample the output signal and produce an echo replica signal, optionally a mixer included in the input link for mixing an echo replica signal produced by the echo cancellation circuit with an input signal produced by the input transducer, and an echo suppression circuitry portion including detector means for producing a first magnitude signal which represents a magnitude property of a first sample of an output signal Soin the output link and a second magnitude signal which represents a magnitude property of a second sample of an input electrical signal Siin the input link between the mixer and the transmitter portion, an analyzer, connected to receive inputs comprising the first and second magnitude signals from the detector means, for measuring a relationship between the first and second magnitude signals and for producing a control signal when the relationship exceeds a threshold, wherein the detector means is operable periodically to analyse characteristics of the signal Soto estimate the amount of background noise in the signal Soand to pass as an input to the analyzer a signal representing the estimated amount of backgroudn noise wherein the threshold above which the analyzer produces an output control signal is set adaptively by the analyzer dependent on the estimated background noise.
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Jacob Benesty, Pierre Duhamel and Yves Greneir, Multi-Channel Adaptive Filtering Applied to Multi-Channel Acoustic Echo Cancellation, Lucent Technologies, Bell Labs Innovations, New Jersey, USA, pps 1405-1408.
Avayu Izak
Or-Shraga Boaz
Shahaf Mark
Davis Valerie M.
Motorola Inc.
Trinh Sonny
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