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    • 11. 发明申请
    • AUDIO SYSTEMS FOR PROVIDING ISOLATED LISTENING ZONES
    • 用于提供隔离区域的音频系统
    • WO2017030920A2
    • 2017-02-23
    • PCT/US2016/046660
    • 2016-08-12
    • BOSE CORPORATION
    • OSWALD, CharlesSALVADOR, Eduardo T.VAUTIN, Jeffery R.DUBLIN, Michael S.TENGELSEN, Daniel RossICKLER, Christopher B.
    • H04S3/00
    • G10K11/178H03G3/20H03G5/165H04R2499/13H04S3/008H04S7/302
    • An audio system includes a plurality of near-field speakers arranged in a listening area. A plurality of cross-talk cancellation filters are coupled to the speakers. The speakers and the filters are arranged to provide first and second listening zones in the listening area such that audio from the first listening zone is cancelled in the second listening zone and vice versa. Volume-based equalization circuitry receives an audio signal representing audio content for the first listening zone from an audio source and controls a volume adjustment applied to the audio signal to control a volume of audio in the first listening zone. The circuitry limits attenuation or amplification of a first frequency portion of the audio signal when a volume setting differential corresponding to a difference between volume settings for the first and second zones exceeds a predetermined value.
    • 音频系统包括布置在收听区域中的多个近场扬声器。 多个串扰消除滤波器耦合到扬声器。 扬声器和滤波器被布置成在收听区域中提供第一和第二聆听区域,使得来自第一聆听区域的音频在第二监听区域被取消,反之亦然。 基于音量的均衡电路从音频源接收表示用于第一监听区域的音频内容的音频信号,并且控制应用于音频信号的音量调整以控制第一聆听区域中的音频音量。 当对应于第一和第二区域的音量设置之间的差异的音量设定差异超过预定值时,电路限制音频信号的第一频率部分的衰减或放大。
    • 17. 发明申请
    • ENGINE HARMONIC CANCELLATION SYSTEM AFTERGLOW MITIGATION
    • 发动机谐波消除系统后冷却
    • WO2015034632A2
    • 2015-03-12
    • PCT/US2014/050681
    • 2014-08-12
    • BOSE CORPORATION
    • PAN, Davis Y.
    • G10K11/178
    • G10K11/178G10K11/17823G10K11/17833G10K11/17854G10K11/17883G10K2210/121G10K2210/1282G10K2210/3016G10K2210/3035G10K2210/3037G10K2210/3053
    • A device and method that is configured to operate an active noise reduction system for a motor vehicle, where there is an active noise reduction system input signal that is related to the vehicle engine speed, and where the active noise reduction system comprises one or more adaptive filters that use a filter coefficient to modify the amplitude and/or phase of a noise cancellation reference signal and output noise reduction signals that are used to drive one or more transducers with their outputs directed to reduce engine noise, where the value of the coefficient is related to an adaptive filter leakage factor. Changes in the engine speed, based on the input signal that is related to the vehicle engine operation, are monitored. In response to changes in the engine speed, the adaptive filter leakage factor is temporarily modified.
    • 一种被配置为操作用于机动车辆的主动降噪系统的装置和方法,其中存在与车辆发动机转速相关的主动降噪系统输入信号,并且其中主动降噪系统包括一个或多个自适应 滤波器,其使用滤波器系数来修改噪声消除参考信号的幅度和/或相位,并且输出用于驱动一个或多个换能器的降噪信号,其输出被引导以减少发动机噪声,其中系数值为 与自适应滤波器泄漏因子有关。 监视基于与车辆发动机运转相关的输入信号的发动机转速变化。 响应于发动机速度的变化,自适应滤波器泄漏因子被暂时修改。
    • 18. 发明申请
    • CREST-FACTOR BASED GAIN MODIFICATION
    • 基于确定因子的增益修正
    • WO2015020783A1
    • 2015-02-12
    • PCT/US2014/047427
    • 2014-07-21
    • BOSE CORPORATION
    • SUBAT, Bradford K.WARRIER, Dilip G.JOYCE, Paul
    • H03G3/30H03G7/00
    • H04R3/00H03G3/3005H03G7/002H03G7/007
    • A method for crest-factor based gain modification comprises sampling audio inputs to determine an energy for each input. The inputs are amplified to produce output channels. An average energy is determined for each frame by adding a percentage of a last average energy to a residual percentage of the energy. The last average energy is equal to zero for a first sampling of the audio inputs. The residual percentage is equal to one hundred minus the percentage of the last average energy. The amplifier gain is iteratively reduced by a decrease-step for a fixed period until a number of exceeding-inputs is less than or equal to a maximum. The exceeding-inputs have an average energy that exceeds a maximum-energy. The amplifier gain is iteratively increased by an increase-step for another fixed period until a number of exceeding-inputs is greater than a maximum.
    • 用于基于波峰因子的增益修改的方法包括对音频输入进行采样以确定每个输入的能量。 输入被放大以产生输出通道。 通过将最后一个平均能量的百分比加到能量的剩余百分比来确定每个帧的平均能量。 对于音频输入的第一次采样,最后的平均能量等于零。 剩余百分比等于百分之一减去最后平均能量的百分比。 放大器增益通过一个固定周期的减小步骤迭代地减少,直到多个超过输入小于或等于最大值。 超过输入的平均能量超过最大能量。 放大器增益通过增加步长迭代增加另一个固定周期,直到多个超过输入大于最大值。