Facebook Technologies, LLC (Menlo Park, CA)

An audio system for adaptively adjusting spatial sound signal enhancement filter lengths based on estimated direct-to-reverberant ratio (DRR) values. Sensors inside devices used by clients like headsets, worn by users, sense sound waves and generate audio signals. The audio signals are analysed to estimate the DRR values associated with the place. Based on a model, a value for a spatial signal enhance filter length is calculated. The obtained spatial signal enhancement length can be used to design filters for filtering audio signals and creating audio content to be provided to an audio system of the headset for playback of audio to the user.

In an artificial reality environment, simulating sound propagation from a sound source to a listener may use knowledge about acoustic properties of the location, including the direction-to-reverberant ratio associated with the location. A sensor array is unable to distinguish spatially diffuse sound waves from sound produced in a reverberant environment. Spatial signal enhancement filters can be utilized to enhance the audio signal. These filters use the spatial diversity induced by place to create enhanced audio signals. The longer filters enhance the audio quality. Longer filters need more power, and can result in limited improvement as the sound waves are attenuated. Thus, better technology is needed for determining suitable spatial signal enhancement lengths.

Spatial signal enhancement filters use spatial variety in sound waves that are generated in a reverberant area to generate enhanced audio signals. Long filters increase audio quality and allow for audio playback to the user. Embodiments of the disclosed disclosure provide a method, computer readable medium, and system for generating spatial signal enhancement filters that are of a adequate length for the purpose of facilitating the delivery of audio files (e.g. through an audio output system on the device of the user, like a headset worn by a user).

In some embodiments, an audio signal is received from a sensor array. A direct-to-reverberant ratio (DRR) value is estimated based on the received audio signal. The estimated DRR value is used to determine the length for a spatial signal enhancementfilter. The length of an enhancement filter for spatial signals is adjustable to get the desired length. Users are provided with audio-based content that is partially based on the spatial signal enhancement filter.

Certain embodiments calculate the length of the spatial signals enhancement filter using the estimated DRR value. This is accomplished by using a model which connects various DRR values to the correct lengths of spatial signal enhance filters. Some embodiments use the signal enhancement filter’s performance measure to determine the relation between the estimated DRR value and the lengths the spatial signal enhancement filters. In certain embodiments, when the DRR value that is estimated is associated with a firstfrequency band the second DRR value may be calculated using the audio signal, whereas the second DRR value is associated with a second frequency band. These embodiments calculate the second spatial enhancement filter length based on the second DRR value. The second spatial enhancement filter is adjusted to achieve the second spatial signal enhance filter length. These embodiments also offer audio content to the user , based partly on the adjustedsecond spatial signal enhancement filter. The first and second frequency bands are in the frequency ranges that are used by humans. In certain embodiments, the process of changing the spatial signal enhancement filter so that it has the acquired length of the spatialsignal enhancement filter is a matter of creating a spatial enhancement filter that is based on the obtained spatial signal enhancement filter length. In certain embodiments, changing the spatial signal enhancement filter to include the obtained spatialsignal enhancement length comprises the updating of a spatial signal enhancer filter according to the value of the spatial signal enhancement filter’s length. Some embodiments allow speech to be amplified using the adjusted spatial sign enhancement filter.

Some embodiments allow spatial enhancement filters to be adaptively adjusted in response to changes in the audio signal. In some embodiments, the adaptive adjustment of the filterlengths provides faster generation of audio content filtered so that they are in compliance with a threshold performance value. This is in contrast to the production of filtered audio content without the adaptive adjustment of filter lengths.

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