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Spatial audio array processing system and method

專(zhuān)利號(hào)
US11997474B2
公開(kāi)日期
2024-05-28
申請(qǐng)人
Wave Sciences, LLC（US SC Charleston）
發(fā)明人
James Keith McElveen; Gregory S. Nordlund, Jr.; Leonid Krasny
IPC分類(lèi)
H04S7/00; H04R1/40
技術(shù)領(lǐng)域
audio,acoustic,or,in,sound,green's,spatial,may,target,processing
地域： SC SC Charleston

摘要

A spatial audio processing system operable to enable audio signals to be spatially extracted from, or transmitted to, discrete locations within an acoustic space. Embodiments of the present disclosure enable an array of transducers being installed in an acoustic space to combine their signals via inverting physical and environmental models that are measured, learned, tracked, calculated, or estimated. The models may be combined with a whitening filter to establish a cooperative or non-cooperative information-bearing channel between the array and one or more discrete, targeted physical locations in the acoustic space by applying the inverted models with whitening filter to the received or transmitted acoustical signals. The spatial audio processing system may utilize a model of the combination of direct and indirect reflections in the acoustic space to receive or transmit acoustic information, regardless of ambient noise levels, reverberation, and positioning of physical interferers.

說(shuō)明書(shū)

Apart from sound acquisition enhancement from selected sound source directions in an acoustic space, a further advantage of microphone array systems in general is the ability to locate and track prominent sound sources in the acoustic space. Two common techniques of sound source location are known as the time difference of arrival (TDOA) method and the steered response power (SRP) method, which can be used either alone or in combination.

As mentioned above, microphone array beamforming techniques are commonly used to reduce the amount of reverberation captured by the transducers. Excessive reverberation negatively affects the intelligibility and quality of captured audio as perceived by human listeners, as well as the performance of automatic speech recognition and speech biometric systems. Reverberation is reduced by microphone array beamformers by reducing the contribution of sounds received from directions other than the target direction (i.e., where the “beam” is directed).

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