Motorola Solutions, Inc.

Cheah Heng Tan

Kheng Shiang Teh

Thean Hai Ooi

Huoy Thyng Yow

Cheah Chan Kee

Teik Seng Saw

Francesca Schuler

Jesus Francisco Corretjer

Andrew P Miehl

Ban Hin Ooi

Kow Chee Chong

Macwien Krishnamurthi

Deborah A Gruenhagen

William B Kiger

Edmond Louie

Robert J Novorita

Charles H Carter

Friedrich J Bollmann

Daniel J Jakl

Chi Meng Khong

Yi Gao

Pek B Teo

Dipti V Desai

Kar Boon Oung

Yusasmadi Yusof

Peter William Hilding Svendsen

Dharmendrasinh R Mahida

Meng-Ge Duan

V C Prakash Vk Chacko

Jian Han

Gim Pei Ng

Linus Francis

Wei Qing Ong

Alan Wee Chiat Tan

Maria C Forero Mujica

Bernie Peng Chung Tan

A voice activity detection system () filters audio input frames (), on a frame=by-frame basis through a gammatone filterbank () to generate filtered gammatone output signals (). A signal energy calculator () takes the filtered gammatone output signals and generates a plurality of energy envelopes. Weighting factors are constructed () are applied to each of the energy envelopes thereby producing normalized weighted signal (), in which voice regions are emphasized and noise regions are minimized. An entropy measurement () is taken to extract information from the normalized weighted signals () and generate an entropy signal (). The entropy signal () is averaged and compared to an adaptive entropy threshold (), indicative of a noise floor. Decision logic () is used to identifying speech and noise from the comparison of the averaged entropy signal to the adaptive entropy threshold.

Method and apparatus for voice activity detection

A method and apparatus for distinguishing voice signals that are played together over the same speaker employs spectral reshaping of one or more of the audio signals. The spectral reshaping shifts modifies the timber of the voice signal while not modifying the pitch of the voice signal. Additional techniques can be used to further distinguish voice signals, such as dynamic gain offset and frequency shifting. After processing one or more signals to spectrally reshape them, they can be played over the same speaker. A user hearing the resulting acoustic signal will be more able to distinguish between the multiple voice signals being played.

Method and apparatus for discriminating between voice signals

A method and apparatus for detecting the connection of an external audio accessory to an audio device via a two-wire audio jack includes providing a DC bias on the output of the audio circuit connected to the audio jack. The audio jack is such that, when a plug is inserted into the audio jack, the DC bias is removed from an internal routing pin of the audio jack. The change in DC voltage at the internal routing pin indicates connection of the external audio accessory. Furthermore, upon detection, the AC response of the external audio accessory can be determined, and used to select a set of audio settings to be applied to the audio components of the audio device to optimize the performance of the external audio accessory.

Method and apparatus for identifying audio accessory through two pin connection in a two way radio

A housing having a port for reducing wind-induced noise in a communication device. The housing includes a first channel, a second channel, and a ridge between the first and second channels. The housing further includes a tunnel extending through the ridge, which tunnel connects the first and second channels. The housing further includes a microphone port beneath the ridge, which microphone port is connected to the tunnel and connects the tunnel to a microphone cavity in the housing.

Slim-tunnel wind port for a communication device

Preprocessing speech signals from an indirect conduction microphone. One exemplary method preprocesses the speech signal in two stages. In stage one, an external speech sample is characterized using an auto regression model, and coefficients from the model are convolved with the internal speech signal from the indirect conduction microphone to produce a pre-conditioned internal speech signal. In stage two, a training sound is received by the indirect conduction microphone and filtered through a low-pass filter. The result is then modeled using auto regression, and inverted to produce an inverted filter model. The pre-conditioned internal speech signal is convolved with the inverted filter model to remove negative or undesirable acoustic characteristics and loss from the speech signal from the indirect conduction microphone.

Method for preprocessing speech for digital audio quality improvement

An apparatus, system and method for wirelessly charging are provided within a vehicular environment. The wireless charging system comprises a seatbelt receptacle containing a transmit coil integrated therein for transmitting a charging signal to a battery or powering a battery operated device. A repeater coil can be wirelessly coupled to the transmit coil via the seatbelt's buckle, as a buckle repeater coil or a retrofit cover repeater coil. Additional repeater coils may be added to a shoulder strap, a lap strap, or other portions of the seat belt harness for additional charging points. The additional repeater coils are slideable to adjust for different body sizes. One or more portable devices having receive coils can be charged or powered wirelessly from the transmit coil in the seatbelt receptacle, the repeater coil of the seatbelt buckle or cover, and/or the additional adjustable strap repeater coils.

Apparatus, system and method for in-vehicle wireless charging

A communication device is configured to receive signals using at least one acoustic microphone and at least one structural microphone. The communication device calculates one of first a signal-to-noise (SNR) ratio and a speech-to-noise ratio for the at least one acoustic microphone from received signals and calculates a SNR for the at least one structural microphone from received signals. The communication device compares one of the first SNR and the speech-to-noise ratio for the at least one acoustic microphone with the SNR for the at least one structural microphone. The communication device selects one of the at least one acoustic microphone and at least one structural microphone to receive speech responsive to the comparing and places a selected one of the at least one acoustic microphone and at least one structural microphone in a standby mode.

Apparatus and method for coordinating use of different microphones in a communication device

A battery module for a portable communication device having a controller. In one embodiment, the battery module includes a battery accessory interface having a positive terminal, an identifying terminal, and a negative terminal. A voltage regulator is connected to the positive terminal of the battery accessory interface and configured to output a voltage on the positive terminal in response to a control signal. An addressable switch is connected to the identifying terminal of the battery accessory interface. The addressable switch is configured to communicate with the controller and generate the control signal based on input from the controller and the identifying terminal.

Battery module for communication devices having an accessory interface

An improved keypad and speaker assembly is provided. The assembly () comprises a speaker grille formed of torturous porting (), and a keyboard () comprising audio slots () which are offset beneath the tortuous porting (). The speaker () is aligned beneath the keyboard (). The tortuous porting () and audio slots () provide an unobstructed air passage/path between the speaker and ambient while protecting against water intrusion.

Speaker and keypad assembly for a portable communication device

An intrinsically safe audio circuit and intrinsically safe portable two-way radio device meet conventional audio output requirements and intrinsically safe design limitations by separating the speaker coil of the device's speaker into separate coils to limit the energy storage possible in any one of the coils. Each separate coil is driven by one of several different audio power amplifiers that each output a substantially identical signal, and each of which are current limited.

Intrinsically safe audio circuit for a portable two-way radio

A method and apparatus for receiving and playing a signal in a radio receiver to suppress microphonic feedback are provided by alternately pitch shifting a received audio signal. The pitch of the received audio signal is alternately shifted up and then down, repeatedly over successive intervals of the audio signal, to produce a pitch swing signal which is then played over a speaker. The alternating pitch shifting prevents the buildup of regenerative feedback normally caused by acoustic vibrations coupling into the radio receiver.

Method and apparatus for receiving and playing a signal in a radio receiver

A portable full duplex communication device () is provided with improved acoustic porting () by providing an earpiece enclosure () within the housing () of device. The earpiece enclosure () includes an array of micro-ports () formed to provide optimal low frequency response and echo performance without the use of external acoustical leak ports to the housing.

Acoustic porting for a portable communication device

A method for maintaining transmit audio quality under harsh environmental conditions, the method includes receiving audio signals into a microphone of a portable communication device and determining at least one parameter associated with the received audio signals. In accordance with an embodiment, the at least one parameter is compared with a received audio parameter threshold. When the at least one parameter falls outside of the received audio parameter threshold, the audio routing is switched from the microphone to the loudspeaker. Subsequent communication may revert back to the microphone or remain at the loudspeaker depending on monitored audio conditions.

Growing community of inventors

Bayan Lepas, Malaysia

Cheah Heng Tan