公开(公告)号：US20090116660A1

公开(公告)日：2009-05-07

申请号：US11921822

申请日：2006-02-09

申请人： James J. Croft, III ,  Wensen Liu ,  Elwood G. Norris

发明人： James J. Croft, III ,  Wensen Liu ,  Elwood G. Norris

IPC分类号： H04B3/00 ,  G08B3/00

CPC分类号： H04R27/00 ,  H04R2217/03

摘要： Parametric sound reproduction in high-intensity audio signaling, for example in hailing and warning at relatively large distances, is disclosed in one example by producing a primary audio signal in the audio frequency range, and producing a secondary audio signal in the audio frequency range by modulation of the primary audio signal, wherein the primary signal is chosen to enable an improved effect, for example one of directional reproduction, exploiting greater sensitivity of human hearing, exploiting an efficient or maximum intensity frequency range of a transducer used to reproduce the audio signals, and another parameter effecting distance, intelligibility, or intensity of an audio signal.

摘要翻译： 在一个示例中，通过在音频范围中产生主音频信号，并且通过在音频频率范围内产生辅助音频信号，从而在音频频率范围内产生辅助音频信号，例如在高强度音频信号中的参数声音再现，例如在相对较大距离的呼叫和警告中 主要音频信号的调制，其中选择主信号以实现改进的效果，例如定向再现之一，利用人类听觉更大的灵敏度，利用用于再现音频信号的换能器的有效或最大强度频率范围 ，以及影响音频信号的距离，清晰度或强度的另一参数。

公开(公告)号：US08275137B1

公开(公告)日：2012-09-25

申请号：US12079204

申请日：2008-03-24

申请人： Wensen Liu ,  Norbert P. Daberko ,  James J. Croft, III

发明人： Wensen Liu ,  Norbert P. Daberko ,  James J. Croft, III

IPC分类号： H03G3/00

CPC分类号： H03G5/005 ,  H03C1/06 ,  H04R3/12 ,  H04R5/04 ,  H04R2217/03

摘要： A system and methods for distortion reduction in a non-linear audio system are disclosed. A method includes the operation of defining a non-linear system transfer function which relates a system electronic input signal with a system acoustic output over a range in which the system acoustic output is in a transition between non-saturated and saturated conditions in a medium in which the system acoustic output of the non-linear audio system is broadcast. A preprocessing transfer function is created that is the inverse of the non-linear system transfer function. The preprocessing transfer function is applied to the system electronic input signal to reduce the level of harmonic distortion at the system acoustic output.

摘要翻译： 公开了一种用于非线性音频系统中的失真减少的系统和方法。 一种方法包括定义非线性系统传递函数的操作，其将系统电子输入信号与系统声输出在系统声输出处于介质中的非饱和和饱和状态之间的转变的范围内相关联的系统声输出相关联 其中广播非线性音频系统的系统声输出。 创建与非线性系统传递函数相反的预处理传递函数。 预处理传递函数适用于系统电子输入信号，以降低系统声输出处的谐波失真水平。

公开(公告)号：US07551062B2

公开(公告)日：2009-06-23

申请号：US11901270

申请日：2007-09-14

申请人： James J. Croft, III ,  Wensen Liu ,  Clifton Wynn Thompson

发明人： James J. Croft, III ,  Wensen Liu ,  Clifton Wynn Thompson

IPC分类号： G08B3/10

CPC分类号： H04R1/406

摘要： A directional acoustic device configured for producing a directional output along an acoustic axis, including at least one transducer configured to create at least two wave trains which are directed along differing pathways by at least one wave guide, and so disposed that in directions more than ninety degrees off the acoustic axis the SPL of the output is greatly diminished by cancellation effects between the wave trains; improvement over previous gradient and quarter-wave pipe directional systems being enabled.

摘要翻译： 定向声学装置，其被配置用于沿着声轴产生定向输出，包括至少一个换能器，其构造成产生至少两个波段，所述至少两个波列通过至少一个波导引导沿着不同的路径，并且被设置为沿着超过九十 离开声轴，输出的SPL通过波列之间的抵消效应大大减少; 改进了以前的梯度和四分之一波导管系统的启用。

公开(公告)号：US20080129470A1

公开(公告)日：2008-06-05

申请号：US11901270

申请日：2007-09-14

申请人： James J. Croft ,  Wensen Liu ,  Clifton Wynn Thompson

发明人： James J. Croft ,  Wensen Liu ,  Clifton Wynn Thompson

IPC分类号： G08B3/10 ,  H01L41/00

CPC分类号： H04R1/406

摘要： A directional acoustic device configured for producing a directional output along an acoustic axis, including at least one transducer configured to create at least two wave trains which are directed along differing pathways by at least one wave guide, and so disposed that in directions more than ninety degrees off the acoustic axis the SPL of the output is greatly diminished by cancellation effects between the wave trains; improvement over previous gradient and quarter-wave pipe directional systems being enabled.

摘要翻译： 定向声学装置，其被配置用于沿着声轴产生定向输出，包括至少一个换能器，其构造成产生至少两个波段，所述至少两个波列通过至少一个波导引导沿着不同的路径，并且被设置为沿着超过九十 离开声轴，输出的SPL通过波列之间的抵消效应大大减少; 改进了以前的梯度和四分之一波导管系统的启用。

公开(公告)号：US20050195985A1

公开(公告)日：2005-09-08

申请号：US11065698

申请日：2005-02-24

申请人： James Croft ,  Wensen Liu

发明人： James Croft ,  Wensen Liu

IPC分类号： H04R17/00 ,  H04B3/00 ,  H03G5/00 ,  H04B1/02

CPC分类号： H04R17/00 ,  H04R2217/03

摘要： A parametric sound system for creating an acoustical column along an axis of propagation having a quiet zone an audible zone is disclosed. The system comprises a parametric electro-acoustic emitter configured for emitting a plurality of focalized parametric ultrasonic waves. A plurality of decoupled acoustic waves are maximized at a focalizing area within the audible zone. The system also includes a signal source for applying a parametric ultrasonic signal to the parametric electroacoustic emitter. The signal includes an ultrasonic carrier signal and one or more sideband signals corresponding to an audio input signal. The system further comprises a signal processor for controlling phases of the parametric ultrasonic signal so that the plurality of focalized parametric ultrasonic waves emitted by the parametric electro-acoustic emitter will create a quiet zone along the same direction of propagation as the audible zone. The plurality of decoupled audio waves are substantially in phase within the audible zone while the plurality of decoupled audio waves are largely out-of-phase within the quiet zone.

摘要翻译： 公开了一种用于沿着具有安静区域的声音区域的传播轴线产生声柱的参数声音系统。 该系统包括被配置为发射多个聚焦参数超声波的参数电声发射器。 多个解耦声波在可听区域内的聚焦区域被最大化。 该系统还包括用于将参数超声波信号施加到参数电声发射器的信号源。 信号包括超声波载波信号和对应于音频输入信号的一个或多个边带信号。 该系统还包括用于控制参数超声波信号的相位的信号处理器，使得由参数电声发射器发射的多个聚焦参数超声波将沿着与可听区域相同的传播方向产生安静区域。 多个解耦音频波在可听区域内基本上同相，而多个解耦音频波在安静区域内大体上是异相的。