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    • 4. 发明授权
    • Audio spatialization and environment simulation
    • 音频空间化与环境模拟
    • US09154896B2
    • 2015-10-06
    • US13332699
    • 2011-12-21
    • Jerry MahabubStephan A. BernseeGary Smith
    • Jerry MahabubStephan A. BernseeGary Smith
    • H04R5/00H04S5/00H04S3/00H04S1/00
    • H04S5/00H04R2499/13H04S1/00H04S3/00H04S2400/03H04S2420/01
    • Methods and apparatus are disclosed for processing an audio sound source to create four-dimensional spatialized sound. A virtual sound source may be moved along a path in three-dimensional space over a specified time period to achieve four-dimensional sound localization. The various embodiments described herein provide methods and systems for converting existing mono, 2-channel and/or multi-channel audio signals into spatialized audio signals have two or more audio channels. The incoming audio signals may be down-mixed, up-mixed or otherwise translated into fewer, greater or the same number of audio channels. The various embodiments also describe methods, systems and apparatus for generating low frequency effect and center channel signals from incoming audio signals having one or more channels.
    • 公开了用于处理音频声源以产生四维空间化声音的方法和装置。 虚拟声源可以在三维空间中的路径上移动规定的时间段以实现四维声音定位。 本文描述的各种实施例提供了用于将现有的单声道,2声道和/或多声道音频信号转换为具有两个或更多个音频通道的空间化音频信号的方法和系统。 传入的音频信号可以被混合,混合或以其他方式转换成更少,更大或相同数量的音频通道。 各种实施例还描述了用于从具有一个或多个信道的输入音频信号产生低频效应和中心信道信号的方法,系统和装置。
    • 7. 发明申请
    • AUDIO SPATIALIZATION AND ENVIRONMENT SIMULATION
    • 音频空间化和环境模拟
    • US20090046864A1
    • 2009-02-19
    • US12041191
    • 2008-03-03
    • Jerry MahabubStephan M. BernseeGary Smith
    • Jerry MahabubStephan M. BernseeGary Smith
    • H04R5/00
    • H04S7/30H04R5/033H04R5/04H04S7/305H04S2400/11H04S2420/01
    • A method and apparatus for processing an audio sound source to create four-dimensional spatialized sound. A virtual sound source may be moved along a path in three-dimensional space over a specified time period to achieve four-dimensional sound localization. A binaural filter for a desired spatial point is applied to the audio waveform to yield a spatialized waveform that, when the spatialized waveform is played from a pair of speakers, the sound appears to emanate from the chosen spatial point instead of the speakers. A binaural filter for a spatial point is simulated by interpolating nearest neighbor binaural filters chosen from a plurality of pre-defined binaural filters. The audio waveform may be processed digitally in overlapping blocks of data using a Short-Time Fourier transform. The localized sound may be further processed for Doppler shift and room simulation.
    • 一种用于处理音频声源以产生四维空间化声音的方法和装置。 虚拟声源可以在三维空间中的路径上移动规定的时间段以实现四维声音定位。 用于所需空间点的双耳滤波器被施加到音频波形以产生空间化波形,当从一对扬声器播放空间化波形时,声音似乎从所选择的空间点而不是扬声器发出。 通过内插从多个预定义双耳滤波器中选择的最近邻双耳滤波器来模拟空间点的双耳滤波器。 音频波形可以使用短时傅里叶变换以数字方式在重叠的数据块中进行数字处理。 本地声音可进一步处理多普勒频移和室内模拟。
    • 10. 发明申请
    • Image reject circuit using sigma-delta conversion
    • 使用Σ-Δ转换的图像抑制电路
    • US20070053469A1
    • 2007-03-08
    • US11598035
    • 2006-11-13
    • Gary Smith
    • Gary Smith
    • H04L27/22
    • H03D3/007
    • In a digital IF downconversion circuit, in-phase and quadrature signal components are processed in the form of a single serial digital bit stream through a set of simple logic in combination with a reconstruction filter. A source digital oscillator supplying digital signal mixers employs an oversampled digital word of four bits in length, all of which are binary weighted, to achieve at least sixteen levels of accuracy for a sine wave mixing signal without significant phase or amplitude error. The mixer mixes the digitized serial bit stream according to the clock with output of a four-bit wide table representing the source oscillator and the in-phase and quadrature signals are recombined digitally, followed by binary weighting using weighted resistors coupled into a filter. Thus, image rejection is a digital function which is unaffected by resistor tolerance.
    • 在数字IF下变频电路中,通过与重建滤波器组合的一组简单逻辑,以单个串行数字位流的形式处理同相和正交信号分量。 提供数字信号混合器的源数字振荡器采用长度为四位的过采样数字字,所有这些都是二进制加权的,以实现正弦波混频信号的至少16级精度,而没有明显的相位或幅度误差。 混频器根据时钟将数字化的串行比特流与表示源振荡器的四位宽表的输出进行混合,同相和正交信号被数字重新组合,然后使用耦合到滤波器中的加权电阻进行二进制加权。 因此,图像抑制是数字功能,不受电阻容限的影响。