Motorola Corporation

Motorola Solutions, Inc.

Peter M Pavlov

David M Yeager

Jason Darrell McIntosh

Jorge L Garcia

Graeme Johnson

Jianfeng Shi

Graeme P Johnson

Jason D Mcintosh

A communication device () is provided with a technique () for self-diagnosing an air leak. The leak is determined without having to open the communication device by applying a temporary excitation signal to the speaker terminals () to produce a damped response () and then monitoring the damped response () of the speaker.

Air leak self-diagnosis for a communication device

The invention concerns a method () and system () for suppressing receiver audio regeneration. The method () includes the steps of receiving a communication signal (), at a Radio Frequency (RF) unit (), demodulating the communication signal to an audio signal (), monitoring a volume level of the audio signal (), and shifting the pitch of the audio signal when the volume level reaches a predetermined threshold (), and playing the pitch-shifted audio signal out of a speaker to produce a pitch-shifted acoustic signal (). The method can shift the pitch of the audio signal to produce a pitch-shifted acoustic signal with signal properties suppressing regeneration of the acoustic signal onto the audio signal at the RF unit. The amount of pitch-shifting can be a function of the volume level.

Method and system for suppressing receiver audio regeneration

A speaker () having a diagnostic capability, as well as a circuit () and related methods () for performing speaker diagnostics based upon a driving-point impedance are provided. The speaker includes a flexible cone () and a voice coil () connected to the flexible cone for driving the flexible cone so as to convert electrical signals into sound. The speaker also includes a signal source () connected to the voice coil for supplying a test signal to the voice coil. The speaker further includes a signal sensor () electrically connected to the voice coil for sensing a response signal occurring in response to the test signal. Additionally, the speaker includes a condition determining module () for determining a driving-point impedance based upon the response signal and for comparing the driving-point impedance to a predetermined impedance to thereby determine a condition of the speaker.

Speaker diagnostics based upon driving-point impedance

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Plantation, FL, United States of America

Peter M Pavlov