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1. 发明申请

US20100061564A1 AMBIENT NOISE REDUCTION SYSTEM 审中-公开
标题翻译：环境噪声减少系统
公开(公告)号：US20100061564A1
公开(公告)日：2010-03-11
申请号：US12525889
申请日：2008-02-06
申请人： Richard Clemow , Alastair Sibbald , Robert David Alcock
发明人： Richard Clemow , Alastair Sibbald , Robert David Alcock
IPC分类号： G10K11/16
CPC分类号： H04R1/1083 , G10K11/17833 , G10K11/17881 , G10K11/17885 , G10K2210/1081 , G10K2210/3028 , G10K2210/3039 , G10K2210/503 , H04R5/033
摘要： An adaptive, feed-forward, ambient noise-reduction system includes a reference microphone for generating first electrical signals representing incoming ambient noise, and a connection path including a circuit for inverting these signals and applying them to a loudspeaker directed into the ear of a user. The system also includes an error microphone for generating second electrical signals representative of sound (including that generated by the loudspeaker in response to the inverted first electrical signals) approaching the user's ear. An adaptive electronic filter is provided in the connection path, together with a controller for automatically adjusting one or more characteristics of the filter in response to the first and second electrical signals. The system is configured to constrain the operation of the adaptive filter such that it always conforms to one of a predetermined family of filter responses, thereby restricting the filter to operation within a predetermined and limited set of amplitude and phase characteristics.
摘要翻译：自适应前馈环境降噪系统包括用于产生表示进入的环境噪声的第一电信号的参考麦克风，以及包括用于反转这些信号的电路的连接路径，并将其应用到定向到用户耳朵的扬声器。该系统还包括误差麦克风，用于产生代表用户耳朵的代表声音（包括由扬声器产生的响应于倒置的第一电信号）的第二电信号。连接路径中提供自适应电子滤波器以及响应于第一和第二电信号自动调整滤波器的一个或多个特性的控制器。该系统被配置为约束自适应滤波器的操作，使得它总是符合预定的滤波器响应族中的一个，从而将滤波器限制在预定和有限的幅度和相位特性集合内的操作。

2. 发明授权

US5600727A Determination of position 失效
标题翻译：确定位置
公开(公告)号：US5600727A
公开(公告)日：1997-02-04
申请号：US271602
申请日：1994-07-07
申请人： Alastair Sibbald , Richard Clemow
发明人： Alastair Sibbald , Richard Clemow
IPC分类号： H04R3/00 , H04R5/027 , H04S3/02
CPC分类号： H04R5/027 , H04R3/005 , H04S3/02
摘要： An autocalibration system includes two loudspeakers (2, 4) spaced from three microphones (16, 18, 20). Acoustic transient pulses are emitted by each loudspeaker (2, 4) in turn and from the reception of of these pulses by each of the microphones (16, 18, 20), the time-of-flight for each pulse to each microphone may be derived. From these time-of-flight measurements are also derived the distance and angular displacement of each microphone (16, 18, 20) from a reference point (12) flanked by the loudspeakers (2, 4).
摘要翻译：自动校准系统包括与三个麦克风（16,18,20）间隔开的两个扬声器（2,4）。依次由每个扬声器（2,4）发射声学瞬态脉冲，并且通过每个麦克风（16,18,20）接收这些脉冲，每个麦克风的每个脉冲的飞行时间可以是派生。从这些飞行时间测量还可以导出与扬声器（2,4）相对的参考点（12）的每个麦克风（16,18,20）的距离和角位移。

3. 发明授权

US08670571B2 Frequency control based on device properties 有权
标题翻译：基于设备属性的频率控制
公开(公告)号：US08670571B2
公开(公告)日：2014-03-11
申请号：US12809028
申请日：2008-12-12
申请人： Richard Clemow
发明人： Richard Clemow
IPC分类号： H04R5/033
CPC分类号： H04R3/04 , G10K11/178 , G10K2210/1081 , G10K2210/3056 , H04R1/1083 , H04R29/001
摘要： There is provided a method of controlling a noise cancellation system, the noise cancellation system being for use in a device comprising a speaker for receiving a wanted signal and generating a sound signal therefrom, and the noise cancellation system comprising: a digital filter, for generating a noise cancellation signal from an input signal representative of ambient noise; and an output for applying the noise cancellation signal to the speaker in addition to the wanted signal to generate a sound signal from which the ambient noise has been at least partially cancelled. The method comprises: determining a resonant frequency of the speaker; based on the determined resonant frequency, selecting a set of filter coefficients; and applying the selected set of filter coefficients to the digital filter.
摘要翻译：提供了一种控制噪声消除系统的方法，所述噪声消除系统用于包括用于接收有用信号并由其产生声音信号的扬声器的设备，并且所述噪声消除系统包括：数字滤波器，用于产生来自代表环境噪声的输入信号的噪声消除信号; 以及用于除了有用信号之外还将扬声器应用噪声消除信号以产生环境噪声至少部分被消除的声音信号的输出。该方法包括：确定扬声器的谐振频率; 基于所确定的谐振频率，选择一组滤波器系数; 以及将所选择的一组滤波器系数应用于数字滤波器。

4. 发明申请

US20120170765A1 DIGITAL CIRCUIT ARRANGEMENTS FOR AMBIENT NOISE-REDUCTION 有权
标题翻译：用于环境噪声减少的数字电路装置
公开(公告)号：US20120170765A1
公开(公告)日：2012-07-05
申请号：US13416707
申请日：2012-03-09
申请人： Richard Clemow
发明人： Richard Clemow
IPC分类号： G10K11/16
CPC分类号： G10K11/178 , G10K11/16 , G10K2210/1081 , G10K2210/3051 , G10K2210/3217 , H04R1/1083 , H04R3/02
摘要： A digital circuit arrangement for an ambient noise-reduction system affording a higher degree of noise reduction than has hitherto been possible. The arrangement converts the analog signals into N-bit digital signals at sample rate f0, and then subjects the converted signals to digital filtering. The value of N in some embodiments is 1 but, in any event, is no greater than 8, and f0 may be 64 times the Nyquist sampling rate but, in any event, is substantially greater than the Nyquist sampling rate. This permits digital processing to be used without incurring group delay problems that rule out the use of conventional digital processing in this context. Furthermore, adjustment of the group delay can readily be achieved, in units of a fraction of a micro-second, providing the ability to fine tune the group delay for feed forward applications.
摘要翻译：用于环境降噪系统的数字电路装置提供比迄今为止可能更高程度的噪声降低的数字电路装置。该装置将模拟信号以采样率f0转换为N位数字信号，然后将转换的信号转换为数字滤波。在一些实施例中，N的值为1但是在任何情况下都不大于8，并且f0可以是奈奎斯特采样率的64倍，但是在任何情况下都大大地高于奈奎斯特采样率。这允许使用数字处理，而不会导致在这种情况下排除使用常规数字处理的组延迟问题。此外，可以容易地实现组延迟的调整，以微秒的一小部分为单位，提供微调前馈应用的组延迟的能力。

5. 发明申请

US20100310086A1 NOISE CANCELLATION SYSTEM WITH LOWER RATE EMULATION 有权
标题翻译：具有较低速率仿真的噪声消除系统
公开(公告)号：US20100310086A1
公开(公告)日：2010-12-09
申请号：US12808931
申请日：2008-12-12
申请人： Anthony James Magrath , Richard Clemow
发明人： Anthony James Magrath , Richard Clemow
IPC分类号： G10K11/16
CPC分类号： G10K11/178 , G10K2210/1081 , G10K2210/3026 , G10K2210/3027 , G10K2210/3028 , G10K2210/3051 , H04R3/002
摘要： There is provided a noise cancellation system, comprising: an input for a digital signal, the digital signal having a first sample rate; a digital filter, connected to the input to receive the digital signal; a decimator, connected to the input to receive the digital signal and to generate a decimated signal at a second sample rate lower than the first sample rate; and a processor. The processor comprises: an emulation of the digital filter, connected to receive the decimated signal and to generate an emulated filter output; and a control circuit, for generating a control signal on the basis of the emulated filter output. The control signal is applied to the digital filter to control a filter characteristic thereof.
摘要翻译：提供了一种噪声消除系统，包括：用于数字信号的输入端，所述数字信号具有第一采样率; 数字滤波器，连接到输入端以接收数字信号; 抽头，连接到输入端以接收数字信号并以低于第一采样率的第二采样率产生抽取信号; 和处理器。处理器包括：数字滤波器的仿真，连接以接收抽取信号并产生仿真滤波器输出; 以及控制电路，用于根据仿真的滤波器输出产生控制信号。控制信号被施加到数字滤波器以控制其滤波器特性。

6. 发明申请

US20090046867A1 Digtal Circuit Arrangements for Ambient Noise-Reduction 有权
标题翻译：数字电路布置环境降噪
公开(公告)号：US20090046867A1
公开(公告)日：2009-02-19
申请号：US12295709
申请日：2007-04-11
申请人： Richard Clemow
发明人： Richard Clemow
IPC分类号： G10K11/16
CPC分类号： G10K11/178 , G10K11/16 , G10K2210/1081 , G10K2210/3051 , G10K2210/3217 , H04R1/1083 , H04R3/02
摘要： The invention provides a digital circuit arrangement for an ambient noise-reduction system affording a higher degree of noise reduction than has hitherto been possible, through the use of a low latency signal processing chain consisting of analogue-to-digital conversion, digital processing and digital-to-analogue conversion. The arrangement converts the analogue signals into N-bit digital signals at sample rate f0, and then subjects the converted signals to digital filtering. The value of N in some embodiments is 1 but, in any event, is no greater than 8, and f0 may be 64 times the Nyquist sampling rate but, in any event, is substantially greater than the Nyquist sampling rate. This permits digital processing to be used without incurring group delay problems that rule out the use of conventional digital processing in this context. Furthermore, adjustment of the group delay can readily be achieved, in units of a fraction of a micro-second, providing the ability to fine tune the group delay for feed-forward applications.
摘要翻译：本发明提供了一种用于环境降噪系统的数字电路装置，其通过使用由模数转换，数字处理和数字化的低等待时间信号处理链提供比迄今为止可能更高程度的噪声降低模拟转换。该装置将模拟信号转换成采样率f0的N位数字信号，然后将转换的信号转换为数字滤波。在一些实施例中，N的值为1但是在任何情况下都不大于8，并且f0可以是奈奎斯特采样率的64倍，但是在任何情况下都大大地大于奈奎斯特采样率。这允许使用数字处理，而不会导致在这种情况下排除使用常规数字处理的组延迟问题。此外，可以以微秒的一小部分为单位容易地实现组延迟的调整，从而提供对前馈应用的组延迟进行微调的能力。

7. 发明授权

US08908876B2 Noise cancellation system with lower rate emulation 有权
标题翻译：具有较低速率仿真的噪声消除系统
公开(公告)号：US08908876B2
公开(公告)日：2014-12-09
申请号：US12808931
申请日：2008-12-12
申请人： Anthony James Magrath , Richard Clemow
发明人： Anthony James Magrath , Richard Clemow
IPC分类号： G10K11/16 , G10K11/178
CPC分类号： G10K11/178 , G10K2210/1081 , G10K2210/3026 , G10K2210/3027 , G10K2210/3028 , G10K2210/3051 , H04R3/002
摘要： There is provided a noise cancellation system, comprising: an input for a digital signal, the digital signal having a first sample rate; a digital filter, connected to the input to receive the digital signal; a decimator, connected to the input to receive the digital signal and to generate a decimated signal at a second sample rate lower than the first sample rate; and a processor. The processor comprises: an emulation of the digital filter, connected to receive the decimated signal and to generate an emulated filter output; and a control circuit, for generating a control signal on the basis of the emulated filter output. The control signal is applied to the digital filter to control a filter characteristic thereof.
摘要翻译：提供了一种噪声消除系统，包括：用于数字信号的输入端，所述数字信号具有第一采样率; 数字滤波器，连接到输入端以接收数字信号; 抽头，连接到输入端以接收数字信号并以低于第一采样率的第二采样率产生抽取信号; 和处理器。处理器包括：数字滤波器的仿真，连接以接收抽取信号并产生仿真滤波器输出; 以及控制电路，用于根据仿真的滤波器输出产生控制信号。控制信号被施加到数字滤波器以控制其滤波器特性。

8. 发明授权

US08644523B2 Digital circuit arrangements for ambient noise-reduction 有权
标题翻译：用于环境降噪的数字电路布置
公开(公告)号：US08644523B2
公开(公告)日：2014-02-04
申请号：US13416707
申请日：2012-03-09
申请人： Richard Clemow
发明人： Richard Clemow
IPC分类号： G10K11/16
CPC分类号： G10K11/178 , G10K11/16 , G10K2210/1081 , G10K2210/3051 , G10K2210/3217 , H04R1/1083 , H04R3/02
摘要： A digital circuit arrangement for an ambient noise-reduction system affording a higher degree of noise reduction than has hitherto been possible. The arrangement converts the analog signals into N-bit digital signals at sample rate f0, and then subjects the converted signals to digital filtering. The value of N in some embodiments is 1 but, in any event, is no greater than 8, and f0 may be 64 times the Nyquist sampling rate but, in any event, is substantially greater than the Nyquist sampling rate. This permits digital processing to be used without incurring group delay problems that rule out the use of conventional digital processing in this context. Furthermore, adjustment of the group delay can readily be achieved, in units of a fraction of a micro-second, providing the ability to fine tune the group delay for feed forward applications.
摘要翻译：用于环境降噪系统的数字电路装置提供比迄今为止可能更高程度的噪声降低的数字电路装置。该装置将模拟信号以采样率f0转换为N位数字信号，然后将转换的信号转换为数字滤波。在一些实施例中，N的值为1但是在任何情况下都不大于8，并且f0可以是奈奎斯特采样率的64倍，但是在任何情况下都大大地高于奈奎斯特采样率。这允许使用数字处理，而不会导致在这种情况下排除使用常规数字处理的组延迟问题。此外，可以容易地实现组延迟的调整，以微秒的一小部分为单位，提供微调前馈应用的组延迟的能力。

9. 发明授权

US08165312B2 Digital circuit arrangements for ambient noise-reduction 有权
标题翻译：用于环境降噪的数字电路布置
公开(公告)号：US08165312B2
公开(公告)日：2012-04-24
申请号：US12295709
申请日：2007-04-11
申请人： Richard Clemow
发明人： Richard Clemow
IPC分类号： G10K11/16
CPC分类号： G10K11/178 , G10K11/16 , G10K2210/1081 , G10K2210/3051 , G10K2210/3217 , H04R1/1083 , H04R3/02
摘要： The invention provides a digital circuit arrangement for an ambient noise-reduction system affording a higher degree of noise reduction than has hitherto been possible, through the use of a low latency signal processing chain consisting of analogue-to-digital conversion, digital processing and digital-to-analogue conversion. The arrangement converts the analogue signals into N-bit digital signals at sample rate f0, and then subjects the converted signals to digital filtering. The value of N in some embodiments is 1 but, in any event, is no greater than 8, and f0 may be 64 times the Nyquist sampling rate but, in any event, is substantially greater than the Nyquist sampling rate. This permits digital processing to be used without incurring group delay problems that rule out the use of conventional digital processing in this context. Furthermore, adjustment of the group delay can readily be achieved, in units of a fraction of a micro-second, providing the ability to fine tune the group delay for feed forward applications.
摘要翻译：本发明提供了一种用于环境降噪系统的数字电路装置，其通过使用由模数转换，数字处理和数字化的低等待时间信号处理链提供比迄今为止可能更高程度的噪声降低模拟转换。该装置将模拟信号转换成采样率f0的N位数字信号，然后将转换的信号转换为数字滤波。在一些实施例中，N的值为1但是在任何情况下都不大于8，并且f0可以是奈奎斯特采样率的64倍，但是在任何情况下都大大地高于奈奎斯特采样率。这允许使用数字处理，而不会导致在这种情况下排除使用常规数字处理的组延迟问题。此外，可以容易地实现组延迟的调整，以微秒的一小部分为单位，提供微调前馈应用的组延迟的能力。

10. 发明申请

US20100322432A1 FREQUENCY CONTROL BASED ON DEVICE PROPERTIES 有权
标题翻译：基于设备属性的频率控制
公开(公告)号：US20100322432A1
公开(公告)日：2010-12-23
申请号：US12809028
申请日：2008-12-12
申请人： Richard Clemow
发明人： Richard Clemow
IPC分类号： G10K11/16
CPC分类号： H04R3/04 , G10K11/178 , G10K2210/1081 , G10K2210/3056 , H04R1/1083 , H04R29/001
摘要： There is provided a method of controlling a noise cancellation system, the noise cancellation system being for use in a device comprising a speaker for receiving a wanted signal and generating a sound signal therefrom, and the noise cancellation system comprising: a digital filter, for generating a noise cancellation signal from an input signal representative of ambient noise; and an output for applying the noise cancellation signal to the speaker in addition to the wanted signal to generate a sound signal from which the ambient noise has been at least partially cancelled. The method comprises: determining a resonant frequency of the speaker; based on the determined resonant frequency, selecting a set of filter coefficients; and applying the selected set of filter coefficients to the digital filter.
摘要翻译：提供了一种控制噪声消除系统的方法，所述噪声消除系统用于包括用于接收有用信号并由其产生声音信号的扬声器的设备，并且所述噪声消除系统包括：数字滤波器，用于产生来自代表环境噪声的输入信号的噪声消除信号; 以及用于除了有用信号之外还将扬声器应用噪声消除信号以产生环境噪声至少部分被消除的声音信号的输出。该方法包括：确定扬声器的谐振频率; 基于所确定的谐振频率，选择一组滤波器系数; 以及将所选择的一组滤波器系数应用于数字滤波器。

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