Facebook Technologies, LLC (Menlo Park, CA)
The present invention is generally related to stereophony and more specifically , to an audio system that is dynamically determining a an acoustic transfer feature that is customized for a user.
The way that sound is perceived in two ears may be different according to the direction of sound and location. The sound that is heard at each ear can be utilized to identify the position of the sound source. In the “surround sound” system, a variety of speakers reproduces the directional aspects of sound by using acoustic transfer functions. An acoustic transfer function represents the relationshipbetween a sound’s location of origin and the method by which the sound is detected, for example via an array of microphones or a person. A single microphone array (or a person wearing a microphone array) might have multiple functions that acoustic transfer can be used for several different sources in the area that is around the microphone array (or around the person who is wearing the microphone array). The location and location in the local area can also impact the acoustic transfer function. Furthermore, the acoustic sensors in a microphone array may be arranged in a large number of possible combinations, and as such, the functions associated with acoustic transmission are distinct to each microphone array. Direct evaluation can prove costly and time-consuming for determining the acoustic transfer function of every microphone array.
Embodiments relate to an audio system for dynamic detection of an Acoustic Transfer Function. Acoustic transfer functions explain the way sound is received at a particular point in space. Particularly, an acoustic function describes the relationship between the parameters of a sound’s at its location of origin and the parameters at which the sound is received by, for instance microphone arrays or an ears of a user. A function called array transfer (ATF) or the head-related function (HRTF) may be used as an acoustic feature. One example of an audio system comprises an array of microphones with several acoustic sensors. Each acoustic sensor is configured to listen for sounds within the local area around the microphone array. At least one of the multiple sensors is connected to a near-eye display (NED). The audio system is also equipped with the controller which is set to estimate a direction of arrival (DoA) of a sound recorded by the microphonearray compared to the location of the NED within the local area. The controller is able to create or update an audio transfer function in the audio system according to the parameters for each sound. Every acoustic transfer function is associated to a specific location of the NED within the local region and the controller can generate or update an acoustic transfer function when the position of the NED changes within the local region. In some instances the audio system utilizes one or more acoustic transfer functions to generate audio content for the user wearing the NED.
A method for dynamically determining an acoustic transmission function is described in some embodiments. The microphone array is able to monitor the sounds that occur in the local area surrounding the microphone array. The microphone array is comprised of several acoustic sensors. At least one of the many acoustic sensors are connected to a near eye display (NED). The direction of arrival (DoA) of an acoustic signal that is detected in relation to the location of the NED within the local area is estimated. In based upon the DoA estimation, anacoustic transfer function that is associated with the NED is adjusted. The function that is acoustic can be, e.g., an array transfer function in the microphone array or an HRTF associated to the user. In some embodiments, a computer-readable medium may beconfigured to perform the steps of the procedure.Click here to view the patent on USPTO website.
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