Google Inc.

Amazon Technologies, Inc.

Jian Guo

Dongeek Shin

Jun Yang

Rajeev Conrad Nongpiur

Brian Mitchell Silverstein

Lu Gao

Wei Li

Colin Randall McEnroe

James Paul Tobin

Jennifer Yeelam Wong

Andrew Christopher Felch

The present disclosure provides a mechanism to synchronously drive distributed speakers around a user based on localization outputs of ultra wideband (UWB) communication chips already existing in devices. Distances may be determined between a user device, such as a phone or wearable, and a plurality of distributed speakers or other devices. Based on an intersection point of such distances, the user's location can be identified. Such location can be used to modify how audio is played on each of the plurality of distributed speakers.

Spatial audio guided by ultra wideband user localization

In general, techniques are described by which to enable a transparency mode in vehicles. A device comprising one or more microphones and one or more processors may be configured to perform the techniques. The microphones may capture audio data representative of a sound scene external to a vehicle. The processors may perform beamforming with respect to the audio data to obtain object audio data representative of an audio object in the sound scene external to the vehicle. The processors may next reproduce, by interfacing with one or more speakers included within the vehicle and based on the object audio data, the audio object in the sound scene external to the vehicle.

Transparent audio mode for vehicles

Methods and devices for reducing intermodulation distortion are described herein. In response to receiving an audio input signal, N filtered audio signals may be generated by a filter bank, corresponding to N different frequency bands. The N filtered audio signals may be delayed by a delay time D, and a determination of whether an audio frame of the filtered audio signals includes an audio event or a non-audio event. A signal level estimation may then be determined, the signal level estimation indicating an expander, a compressor, or no compression effects being present. An amount of gain is determined and applied to the delayed audio signals, which are summed across the N frequency bands to generate a full-band audio signal. In some embodiments, the full-band audio signal may be applied to a limiter to reduce any audio clipping, and a final audio signal may be generated.

Systems and methods for reducing intermodulation distortion

A reconfigurable filter bank system that has an asymmetrical tree structure with multiple stages to generate multiband outputs. Each stage may include cascaded low-pass filters (LPFs), cascaded high-pass filters (HPFs) and/or all-pass filter(s) (APF(s)) having identical phase responses. As the cascaded LPFs, cascaded HPFs and APF(s) have identical phase responses, each frequency band of the multiband output may have an identical phase shift such that the frequency bands are in-phase and can be added together. The multiband outputs of the reconfigurable filter bank may have near-perfect reconstruction (e.g., small number of cross-band ripples) and therefore only minor distortion. In addition, the number of frequency bands and corresponding non-uniform bandwidths (e.g., frequency ranges) may be user-adjustable and/or reconfigurable during device operation. Further, the reconfigurable filter bank may have reduced computational complexity and/or latency.

Dynamically reconfigurable filter bank

Growing community of inventors

Sunnyvale, CA, United States of America

Jian Guo