Motorola Corporation

Motorola Israel Ltd.

Izak Avayu

Mark Shahaf

Mark Rozental

Moshe Ben-Ayun

Salomon Serfaty

Eyal Brami

Alexander Shmoukler

Boaz Or-Shraga

Boaz Or Shraga

Yishay Ben-Shimol

Roman Pasternak

Aviad Cohen

An alerting system () for a communication device () is provided. The alerting system is designed to operate in a plurality of operating modes. The alerting system includes a transducer () and an electromechanical switch (). The transducer transforms electrical impulses into vibrations. The electromechanical switch couples the transducer to a first component () of the communication device in a first operating mode. Further, the electromechanical switch couples the transducers to a second component () of the communication device in a second operating mode.

Alerting system for a communication device

A Cartesian loop transmitter having isolator eliminator circuitry is presented. The isolator eliminator circuitry includes a set of low pass and wide band pass as well as narrow band pass filters for each of I- and Q-channels, root mean square detectors and dividers connected to a means for comparing. Signals from the means for comparing are received by a microprocessor which controls attenuation setting. The output level of the transmitter is adjusted by generating a small signal measuring an on-channel signal level and a small signal level and then calculating a ratio of the small signal to the on-channel signal. The attenuation setting is increased if the ratio exceeds a defined threshold.

Cartesian loop transmitter and method of adjusting an output level of such transmitter

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 Sin the output link and a second magnitude signal which represents a magnitude property of a second sample of an input electrical signal Sin 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 Sto estimate the amount of background noise in the signal Sand 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.

Telephone apparatus and a communication method using such apparatus

Echo canceling method including the steps of determining an Euclidean norm of an echo-replica signal, determining an Euclidean norm of an input signal, determining a gradient step size, correcting the coefficients of an adaptive filter, deriving an updated echo-replica signal, and determining an updated error signal by subtracting the updated echo-replica signal from the input signal.

Echo suppression and echo cancellation

An automatic gain control (AGC) circuit including: a forward transmission path () having applied at its input an input RF signal and to provide at its output an output signal; a variable gain AGC amplifier () in the forward transmission path for processing the input RF signal, which amplifier has a control inputand is responsive to a control signal applied at its control input to vary its gain; a feedback loop (to), coupled from the output of the forward transmission path and to the control input of the AGC amplifier; an integrator (), coupled to the control input of the amplifier; a voltage source (), coupled to the integrator and to the control input of the amplifier; and a further variable gain device () for varying the gain or attenuation of a signal applied to the control input of the AGC amplifier.

Automatic gain control circuit and an RF receiver and method using such a circuit

In a speech processing system ( ) characterized by a finite range of audio levels, the speech processing system ( ) receiving an incoming audio signal, the speech processing system amplifying ( ) the incoming audio signal by an audio gain factor, the speech processing system ( ) representing the amplified audio signal by the finite range of audio levels, a method for adjusting the audio gain factor, including the steps of: decreasing the audio gain factor when detecting clipping of the amplified audio signal, maintaining the audio gain factor for a hold time period, and increasing the gain factor when detecting that the result of amplification of the incoming sound levels by the audio gain factor, is lower than the highest level of the finite range of audio levels.

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Mevaseret Zion, Israel

Izak Avayu