Modeling and reduction of drone propulsion system noise

    公开(公告)号:US10522166B2

    公开(公告)日:2019-12-31

    申请号:US15544074

    申请日:2016-01-20

    Abstract: In some embodiments, a method, apparatus and computer program for reducing noise from an audio signal captured by a drone (e.g., canceling the noise signature of a drone from the audio signal) using a model of noise emitted by the drone's propulsion system set, where the propulsion system set includes one or more propulsion systems, each of the propulsion systems including an electric motor, and wherein the noise reduction is performed in response to voltage data indicative of instantaneous voltage supplied to each electric motor of the propulsion system set. In some other embodiments, a method, apparatus and computer program for generating a noise model by determining the noise signature of at least one drone based upon a database of noise signals corresponding to at least one propulsion system and canceling the noise signature of the drone in an audio signal based upon the noise model.

    System and method for adaptive audio signal generation, coding and rendering

    公开(公告)号:US10477339B2

    公开(公告)日:2019-11-12

    申请号:US16443268

    申请日:2019-06-17

    Abstract: Embodiments are described for an adaptive audio system that processes audio data comprising a number of independent monophonic audio streams. One or more of the streams has associated with it metadata that specifies whether the stream is a channel-based or object-based stream. Channel-based streams have rendering information encoded by means of channel name; and the object-based streams have location information encoded through location expressions encoded in the associated metadata. A codec packages the independent audio streams into a single serial bitstream that contains all of the audio data. This configuration allows for the sound to be rendered according to an allocentric frame of reference, in which the rendering location of a sound is based on the characteristics of the playback environment (e.g., room size, shape, etc.) to correspond to the mixer's intent. The object position metadata contains the appropriate allocentric frame of reference information required to play the sound correctly using the available speaker positions in a room that is set up to play the adaptive audio content.

    Generation and playback of near-field audio content

    公开(公告)号:US10063985B2

    公开(公告)日:2018-08-28

    申请号:US15573129

    申请日:2016-05-12

    Abstract: Audio signals (201) are received. The audio signals include left and right surround channels (206). The audio signals are played back using far-field loudspeakers (101-108, 401-406) distributed around a space (111, 409) having a plurality of listener positions (112, 410). The left and right surround channels are played back by a pair of far-field loudspeakers (103, 106, 403, 405) arranged at opposite sides of the space having the plurality of listener positions. An audio component (208) coinciding with or approximating audio content common to the left and right surround channels is obtained. The audio component is played back using at least a pair of near-field transducers (109, 110, 407, 408) arranged at one of the listener positions. Associated systems (100, 400), methods (800) and computer program products are provided. Systems (300), methods (900) and computer program products providing a bitstream (303) comprising the audio signals and the audio component are also provided, as well as a computer-readable medium with data (700) representing such audio content.

    Rendering and playback of spatial audio using channel-based audio systems

    公开(公告)号:US09622014B2

    公开(公告)日:2017-04-11

    申请号:US14409440

    申请日:2013-06-17

    CPC classification number: H04S7/305 H04S3/008 H04S2400/03 H04S2420/03

    Abstract: Embodiments are described for a method and system of rendering and playing back spatial audio content using a channel-based format. Spatial audio content that is played back through legacy channel-based equipment is transformed into the appropriate channel-based format resulting in the loss of certain positional information within the audio objects and positional metadata comprising the spatial audio content. To retain this information for use in spatial audio equipment even after the audio content is rendered as channel-based audio, certain metadata generated by the spatial audio processor is incorporated into the channel-based data. The channel-based audio can then be sent to a channel-based audio decoder or a spatial audio decoder. The spatial audio decoder processes the metadata to recover at least some positional information that was lost during the down-mix operation by upmixing the channel-based audio content back to the spatial audio content for optimal playback in a spatial audio environment.

    Techniques for localized perceptual audio
    16.
    发明授权
    Techniques for localized perceptual audio 有权
    本地化感知音频技术

    公开(公告)号:US09544527B2

    公开(公告)日:2017-01-10

    申请号:US14271576

    申请日:2014-05-07

    Abstract: Audio perception in local proximity to visual cues is provided. A device includes a video display, first row of audio transducers, and second row of audio transducers. The first and second rows can be vertically disposed above and below the video display. An audio transducer of the first row and an audio transducer of the second row form a column to produce, in concert, an audible signal. The perceived emanation of the audible signal is from a plane of the video display (e.g., a location of a visual cue) by weighing outputs of the audio transducers of the column. In certain embodiments, the audio transducers are spaced farther apart at a periphery for increased fidelity in a center portion of the plane and less fidelity at the periphery.

    Abstract translation: 提供本地接近视觉线索的音频感知。 一种设备包括视频显示器,第一排音频换能器和第二排音频换能器。 第一行和第二行可以垂直设置在视频显示器的上方和下方。 第一行的音频换能器和第二排的音频换能器形成一列,以一致地产生一个可听见的信号。 通过称量列的音频换能器的输出,可听见的信号的感知发出来自视频显示的平面(例如,视觉提示的位置)。 在某些实施例中,音频换能器在周边间隔更远,以增加平面中心部分的保真度,并减小外围的保真度。

    TECHNIQUES FOR LOCALIZED PERCEPTUAL AUDIO
    17.
    发明申请
    TECHNIQUES FOR LOCALIZED PERCEPTUAL AUDIO 有权
    用于本地化视听音频的技术

    公开(公告)号:US20140240610A1

    公开(公告)日:2014-08-28

    申请号:US14271576

    申请日:2014-05-07

    Abstract: Audio perception in local proximity to visual cues is provided. A device includes a video display, first row of audio transducers, and second row of audio transducers. The first and second rows can be vertically disposed above and below the video display. An audio transducer of the first row and an audio transducer of the second row form a column to produce, in concert, an audible signal. The perceived emanation of the audible signal is from a plane of the video display (e.g., a location of a visual cue) by weighing outputs of the audio transducers of the column. In certain embodiments, the audio transducers are spaced farther apart at a periphery for increased fidelity in a center portion of the plane and less fidelity at the periphery.

    Abstract translation: 提供本地接近视觉线索的音频感知。 一种设备包括视频显示器,第一排音频换能器和第二排音频换能器。 第一行和第二行可以垂直设置在视频显示器的上方和下方。 第一行的音频换能器和第二排的音频换能器形成一列,以一致地产生一个可听见的信号。 通过称量列的音频换能器的输出,可听见的信号的感知发出来自视频显示的平面(例如,视觉提示的位置)。 在某些实施例中,音频换能器在周边间隔更远,以增加平面中心部分的保真度,并减小外围的保真度。

    Techniques for Localized Perceptual Audio
    18.
    发明申请
    Techniques for Localized Perceptual Audio 有权
    本地感知音频技术

    公开(公告)号:US20130251177A1

    公开(公告)日:2013-09-26

    申请号:US13892507

    申请日:2013-05-13

    Abstract: Audio perception in local proximity to visual cues is provided. A device includes a video display, first row of audio transducers, and second row of audio transducers. The first and second rows can be vertically disposed above and below the video display. An audio transducer of the first row and an audio transducer of the second row form a column to produce, in concert, an audible signal. The perceived emanation of the audible signal is from a plane of the video display (e.g., a location of a visual cue) by weighing outputs of the audio transducers of the column In certain embodiments, the audio transducers are spaced farther apart at a periphery for increased fidelity in a center portion of the plane and less fidelity at the periphery.

    Abstract translation: 提供了本地邻近视觉线索的音频感知。 一种设备包括视频显示器,第一排音频换能器和第二排音频换能器。 第一行和第二行可以垂直设置在视频显示器的上方和下方。 第一行的音频换能器和第二排的音频换能器形成一列,以一致地产生一个可听见的信号。 通过对列的音频换能器的输出进行称重,可听信号的感知发射是通过对视频显示器的平面(例如,视觉提示的位置)进行加权的。在某些实施例中,音频换能器在外围间隔更远, 在平面的中心部分增加了保真度,并且在周边具有较低的保真度。

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