St-ericsson Sa

Silicon Laboratories Inc.

Other

Nxp B.v.

St Wireless Sa

David Anderton

Shaojie Chen

Jeffrey L Yiin

Dana John Taipale

Guner Arslan

Xue-Mei Gong

Thomas Glen Ragan

Carl Alelyunas

Wasim Quddus

Yue Zhao

Kevin Hung

Nicholas R Berkner

An apparatus includes a plurality of delay elements, a plurality of multipliers and an accumulator to form a biquad stage; and a precision logic circuit. The biquad stage includes feedback paths; at least one feedback path has an adjustable bit precision; and the precision logic is adapted to regulate the bit precision of the feedback path(s) based at least in part on at least one parameter that is associated with the biquad stage.

Biquad stage having a selectable bit precision

In one form, an audio processor circuit includes a first digital signal processing circuit, a second digital signal processing circuit, and an interleaver. The first digital signal processing circuit has an input for receiving a far-end audio signal, and an output. The second digital signal processing circuit has an input for receiving a digital near-end audio signal, and an output. The interleaver has a first input coupled to the output of the first digital signal processing circuit, a second input coupled to the output of the second digital signal processing circuit, and an output for alternatively providing signals received from the first and second inputs to the output.

Audio processor circuits for acoustic echo cancellation and method therefor

In one embodiment, the present invention includes a method for determining if a mobile station is to be resynchronized on a handover from a first serving cell to a second serving cell. If so, a first downlink hardware storage may be drained to a predetermined level. This level may then be maintained during the resynchronization.

Managing audio during a handover in a wireless system

In one embodiment, the present invention includes an apparatus for permitting diagnostic testing of a wireless device. The apparatus may include a first switch to route diagnostic information or acoustic information received from a processor of the device, a codec coupled to the first switch to code the routed diagnostic information or acoustic information, and a second switch coupled to the codec to route the coded diagnostic information to a first port of the wireless device and to route the coded acoustic information to the first port or a second port of the wireless device.

Performing diagnostics in a wireless system

A technique includes providing a sidetone path to generate sidetone content in response to audio data and disabling at least part of the sidetone path during an active mode of a radio. The technique includes storing the sidetone content in an outgoing audio buffer that is operational during the active mode of the radio and establishing a delay in the sidetone path to prevent the outgoing audio buffer from being depleted of the sidetone content during the active mode of the radio.

Sidetone generation for a wireless system that uses time domain isolation

A communication apparatus includes a mechanism for reducing loss of text telephone information during normal traffic channel preempting. The communication apparatus includes a transmitter that may generate a signal including a plurality of text telephone symbols for transmission via a voice channel. The transmitter may receive a notification that indicates information transmitted via the voice channel will be replaced by control information. In response to receiving the notification, the transmitter may further selectively prevent at least a portion of the plurality of text telephone symbols from being provided for transmission.

Communication apparatus including a mechanism for reducing loss of text telephone information during normal traffic channel preempting

In one embodiment, the present invention includes a method for determining a level of a buffer that stores data samples. The level may be determined at a predetermined position of a data frame sequence. Based on the level of the buffer at this position, a vocoder and modem of a mobile station may be synchronized. One or both of the vocoder and modem may be adjusted to attain the synchronization. Thus a rate mismatch between the vocoder and modem may be resolved.

Synchronizing a modem and vocoder of a mobile station

A wireless communication device reduces undesired audio underflow in a digital to analog receive path that employs time domain isolation. One or more buffers in the receive path receive processed audio samples from a signal processor. A control circuit senses when the buffers in the receive path are substantially empty. In response to a substantially empty determination by the control circuit, the control circuit instructs one of the buffers to repeat the last processed audio sample which that buffer received to reduce or avoid audio underflow.

Wireless communication system including an audio underflow protection mechanism operative with time domain isolation

A technique includes providing a butter to receive data from a processor of a wireless device in response to an active mode of the processor and selectively coupling an input terminal of a filter to the buffer based on a status of the buffer. The techniciue may be used with a wireless system that includes a digital signal processor, a buffer, a wireless interface and a switch. The buffer receives data from the digital signal processor in response to an active mode of the digital signal processor. The switch selectively couples a terminal of the wireless interface to the buffer in response to a determination of a status of the buffer.

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Austin, TX, United States of America

David Anderton