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1. 发明授权

US09191766B2 Group-delay based bass management 有权
标题翻译：基于组延迟的低音管理
公开(公告)号：US09191766B2
公开(公告)日：2015-11-17
申请号：US12974933
申请日：2010-12-21
申请人： Markus Christoph , Leander Scholz
发明人： Markus Christoph , Leander Scholz
IPC分类号： H03G5/00 , H04S7/00
CPC分类号： H04S7/301 , H04R2499/13 , H04S7/307
摘要： The listening room comprises at least one loudspeaker and at least one listening position. The method comprises providing for each loudspeaker, a group delay response to be equalized associated with one pre-defined position within the listening room; calculating filter coefficients for all-pass filter(s) each arranged upstream to one corresponding loudspeaker, the all-pass filter(s) having a transfer characteristic such that the corresponding group delay response(s) match(es) a predefined target group delay response. The filter coefficients have a group delay response being confined by a frequency dependent group delay constraint that defines a frequency dependent interval exponentially decaying with increasing frequency.
摘要翻译：听音室包括至少一个扬声器和至少一个收听位置。该方法包括：为每个扬声器提供与听音室内的一个预定义位置相关联的要被均衡的组延迟响应; 计算每个布置在一个对应的扬声器上游的全通滤波器的滤波器系数，所述全通滤波器具有传输特性，使得相应的群延迟响应匹配预定义的目标群延迟响应。滤波器系数具有组延迟响应受限于频率依赖组延迟约束，其定义频率依赖的间隔以逐渐增加的频率呈指数衰减。

2. 发明授权

US09071904B2 Noise reducing sound-reproduction 有权
标题翻译：降噪声音再现
公开(公告)号：US09071904B2
公开(公告)日：2015-06-30
申请号：US13559299
申请日：2012-07-26
申请人： Markus Christoph
发明人： Markus Christoph
IPC分类号： H04R3/00 , G10K11/16 , H04R1/10 , G10K11/178
CPC分类号： H04R1/1083 , G10K11/178 , G10K2210/1081 , H04R1/1008 , H04R3/005 , H04R2420/01
摘要： An active noise reduction system includes an earphone with a cup-like housing and a transmitting transducer, which converts electrical signals into acoustical signals and is arranged at an aperture of the housing. A receiving transducer converts acoustical signals into electrical signals, and is arranged proximate the transmitting transducer. A duct includes an end acoustically coupled to the receiving transducer, and another end located proximate the transmitting transducer. An acoustical path extends from the transmitting transducer to a listener's ear, and has a first transfer characteristic. Another acoustical path extends from the transmitting transducer through the duct to the receiving transducer, and which has a second transfer characteristic. A control unit generates a noise reducing electrical signal that is supplied to the transmitting transducer. This signal is derived from the receiving-transducer signal and filtered with a third transfer characteristic. The second and third transfer characteristics together model the first transfer characteristic.
摘要翻译：有源降噪系统包括具有杯状壳体的耳机和发射换能器，其将电信号转换成声信号并且布置在壳体的孔口处。接收传感器将声信号转换为电信号，并且布置在发射换能器附近。管道包括声音耦合到接收换能器的端部，以及位于发射换能器附近的另一端。声道从发射换能器延伸到收听者的耳朵，并且具有第一传递特性。另一声道从发射换能器通过导管延伸到接收换能器，并具有第二传递特性。控制单元生成提供给发送换能器的降噪电信号。该信号从接收 - 换能器信号导出并用第三传输特性滤波。第二和第三传输特性一起模拟了第一传输特性。

3. 发明授权

US08903101B2 Active noise reduction system 有权
标题翻译：主动降噪系统
公开(公告)号：US08903101B2
公开(公告)日：2014-12-02
申请号：US13035393
申请日：2011-02-25
申请人： Markus Christoph , Michael Wurm , Michael Perkmann
发明人： Markus Christoph , Michael Wurm , Michael Perkmann
IPC分类号： G10K11/16 , G10K11/178
CPC分类号： G10K11/1784 , G10K11/178 , G10K2210/1081 , G10K2210/3055
摘要： A system for actively reducing noise at a listening point, includes an earphone housing, a transmitting transducer, a receiving transducer and a controller. The transmitting transducer converts a first electric signal into a first acoustic signal, and radiates the first acoustic signal along a first acoustic path having a first transfer characteristic and along a second acoustic path having a second transfer characteristic. The receiving transducer converts the first acoustic signal and ambient noise into a second electrical signal. The controller compensates for the ambient noise by providing a noise reducing electrical signal to the transmitting transducer. The noise reducing electrical signal is derived from a filtered electrical signal that is provided by filtering the second electrical signal with a third transfer characteristic. The second and the third transfer characteristics together model the first transfer characteristic.
摘要翻译：用于主动降低收听点噪声的系统包括耳机外壳，发送换能器，接收换能器和控制器。发送换能器将第一电信号转换成第一声信号，并且沿着具有第一传输特性的第一声路径和沿着具有第二传输特性的第二声路径辐射第一声信号。接收传感器将第一声信号和环境噪声转换成第二电信号。控制器通过向发射传感器提供降噪电信号来补偿环境噪声。噪声降低电信号是从经过滤波的电信号得到的，该电信号通过用第三传输特性滤波第二电信号来提供。第二和第三传输特性一起模拟了第一传输特性。

4. 发明授权

US08788554B2 Sub-band adaptive FIR-filtering 有权
标题翻译：子带自适应FIR滤波
公开(公告)号：US08788554B2
公开(公告)日：2014-07-22
申请号：US13038964
申请日：2011-03-02
申请人： Markus Christoph
发明人： Markus Christoph
IPC分类号： G06F17/10
CPC分类号： H03H21/0012 , G10L19/0204
摘要： A method for designing a set of sub-band FIR filters, where each FIR filter has a number of filter coefficients and is connected to an adjustable delay line. The method includes dividing an input signal into a number of sub-band signals, where a spectrum of the input signal comprises spectra of the sub-band signals; providing a respective goal sub-band signal for each sub-band dependent on a goal signal; filtering and delaying each sub-band signal using a corresponding FIR filter and delay line to provide filtered signals; providing error signals for each sub-band dependent on the filtered signals and the corresponding goal signals; adapting the filter coefficients of each sub-band FIR filter such that the respective filtered signal approximately matches a corresponding goal sub-band signal; and changing a respective delay of the delay line for each sub-band to reduce or increase a first quality criterion.
摘要翻译：一种用于设计一组子带FIR滤波器的方法，其中每个FIR滤波器具有多个滤波器系数并连接到可调延迟线。该方法包括将输入信号划分成多个子带信号，其中输入信号的频谱包括子带信号的频谱; 根据目标信号为每个子带提供相应的目标子带信号; 使用对应的FIR滤波器和延迟线对每个子带信号进行滤波和延迟以提供滤波信号; 根据滤波信号和相应的目标信号，为每个子带提供误差信号; 调整每个子带FIR滤波器的滤波器系数，使得相应的滤波信号近似匹配对应的目标子带信号; 并且改变每个子带的延迟线的相应延迟以减少或增加第一质量标准。

5. 发明授权

US08422697B2 Background noise estimation 有权
标题翻译：背景噪声估计
公开(公告)号：US08422697B2
公开(公告)日：2013-04-16
申请号：US12718473
申请日：2010-03-05
申请人： Markus Christoph
发明人： Markus Christoph
IPC分类号： H04B15/00 , A61F11/06
CPC分类号： G10L21/0208 , G10L21/0216
摘要： In a system for estimating the power spectral density of acoustical background noise when the level of a smoothed power spectral density signal increases, an increment value is increased, starting from a minimum increment value, by a predetermined amount until a maximum increment value is reached if at the same time the value of the power spectral density currently determined in a new calculation cycle is larger than the estimate value of the power spectral density of the background noise determined in the previous calculation cycle. For cases in which the level of the smoothed power spectral density decreases, the amplitude of the decrement value is increased, starting from a minimum decrement value, by a predetermined amount until a maximum decrement value is reached if at the same time the value of the power spectral density currently determined in a new calculation cycle is smaller than the estimate value of the power spectral density of the background noise determined in the previous calculation cycle.
摘要翻译：在平滑功率谱密度信号的电平增加时用于估计声背景噪声的功率谱密度的系统中，从最小增量值开始增加预定量的增量值，直到达到最大增量值，如果同时在新的计算周期中当前确定的功率谱密度的值大于在先前的计算周期中确定的背景噪声的功率谱密度的估计值。对于平滑功率谱密度的水平降低的情况，减小值的幅度从最小减量值开始增加预定量，直到达到最大减量值，如果同时达到在新的计算周期中当前确定的功率谱密度小于在先前计算周期中确定的背景噪声的功率谱密度的估计值。

6. 发明申请

US20120308029A1 ADAPTIVE FILTERING SYSTEM 有权
标题翻译：自适应滤波系统
公开(公告)号：US20120308029A1
公开(公告)日：2012-12-06
申请号：US13482678
申请日：2012-05-29
申请人： Markus Christoph
发明人： Markus Christoph
IPC分类号： G10K11/16
CPC分类号： H03H17/0266 , H03H17/0229 , H03H21/0012 , H03H2021/0041
摘要： An audio system with at least one audio channel may include a digital audio processor in which at least one digital filter is implemented for each channel. The digital filter of each channel may include: an analysis filter bank configured to receive a broad-band input audio signal and divide the input audio signal into a plurality of sub-bands, a sub-band filter for each sub-band. and a synthesis filter bank configured to receive the filtered sub-band signals and combine them for providing a broad-band output audio signal. A delay is associated with each sub-band signal, the delay of one of the sub-band signals being applied to the broad-band input audio signal upstream of the analysis filter bank and the residual delays being applied to the remaining sub-band signals downstream of the analysis filter bank.
摘要翻译：具有至少一个音频通道的音频系统可以包括其中为每个通道实现至少一个数字滤波器的数字音频处理器。每个通道的数字滤波器可以包括：分析滤波器组，被配置为接收宽带输入音频信号并将输入音频信号划分成多个子带，每个子带的子带滤波器。以及合成滤波器组，被配置为接收经滤波的子带信号并将其组合以提供宽带输出音频信号。延迟与每个子带信号相关联，一个子带信号的延迟被施加到分析滤波器组上游的宽带输入音频信号，并且剩余延迟被施加到剩余的子带信号分析滤波器组的下游。

7. 发明授权

US08165310B2 Dereverberation and feedback compensation system 有权
标题翻译：混响和反馈补偿系统
公开(公告)号：US08165310B2
公开(公告)日：2012-04-24
申请号：US11411004
申请日：2006-04-25
申请人： Markus Christoph , Tim Haulick , Gerhard Uwe Schmidt
发明人： Markus Christoph , Tim Haulick , Gerhard Uwe Schmidt
IPC分类号： H04B3/20 , A61F11/06 , H04R3/00
CPC分类号： H04M3/56 , G10L2021/02082 , H04M9/082 , H04R3/005 , H04R3/02 , H04R3/12 , H04R2499/13
摘要： A dereverberation and feedback compensation system reduces the echo received by a first audio device while reducing the speech feedback received from a second audio device. A decorrelation logic decorrelates audio signals from the first audio device. A first processor generates a noise compensation signal based on the decorrelated audio signals and system determined filter coefficients. The second processor generates an enhanced noise correlation signal based on speech signals of a second audio device and the filter coefficients used by the first processor.
摘要翻译：去混响和反馈补偿系统减少由第一音频设备接收的回声，同时减少从第二音频设备接收的语音反馈。解相关逻辑去除了来自第一音频设备的音频信号。第一处理器基于去相关音频信号和系统确定的滤波器系数产生噪声补偿信号。第二处理器基于第二音频设备的语音信号和由第一处理器使用的滤波器系数产生增强的噪声相关信号。

8. 发明授权

US08160282B2 Sound system equalization 有权
标题翻译：声音系统均衡
公开(公告)号：US08160282B2
公开(公告)日：2012-04-17
申请号：US11697119
申请日：2007-04-05
申请人： Markus Christoph , Leander Scholz
发明人： Markus Christoph , Leander Scholz
IPC分类号： H04R5/02
CPC分类号： H04S7/301 , H04R2499/13
摘要： An automatic sound system equalizer adjusts a sound system to a target sound, where the sound system includes at least two groups of loudspeakers supplied with electrical sound signals to be converted into acoustical sound signals. The equalizer sequentially supplies each group with the respective electrical sound signal; sequentially assesses the deviation of the acoustical sound signal from the target sound for each group of loudspeakers, and adjusts at least two groups of loudspeakers to a relatively small, preferably minimum deviation from the target sound by equalizing the respective electrical sound signals supplied to the groups of loudspeakers.
摘要翻译：自动声音系统均衡器将声音系统调整到目标声音，其中声音系统包括提供有电声信号的至少两组扬声器，以转换成声音信号。均衡器依次向每个组提供相应的电声信号; 依次评估每组扬声器的声音信号与目标声音的偏差，并且通过均衡提供给组的各个电声信号来调节至少两组扬声器到目标声音的相对小的，优选的最小偏差的扬声器。

9. 发明申请

US20100195844A1 ADAPTIVE NOISE CONTROL SYSTEM 有权
标题翻译：自适应噪声控制系统
公开(公告)号：US20100195844A1
公开(公告)日：2010-08-05
申请号：US12696862
申请日：2010-01-29
申请人： Markus Christoph , Michael Wurm
发明人： Markus Christoph , Michael Wurm
IPC分类号： G10K11/16
CPC分类号： G10K11/17817 , G10K2210/1282 , G10K2210/3022
摘要： An active noise cancellation system includes an adaptive filter, a signal source, an acoustic actuator, a microphone, a secondary path and an estimation unit. The adaptive filter receives a reference signal representing noise, and provides a compensation signal in response to the received reference signal. The signal source provides a measurement signal. The acoustic actuator radiates the compensation signal and the measurement signal to the listening position. The microphone receives a first signal that is a superposition of the radiated compensation signal, the radiated measurement signal, and the noise signal at the listening position, and provides a microphone signal in response to the received first signal. The secondary path includes a secondary path system that represents a signal transmission path between an output of the adaptive filter and an output of the microphone. The estimation unit estimates a transfer characteristic of the secondary path system in response to the measurement signal and the microphone signal.
摘要翻译：主动噪声消除系统包括自适应滤波器，信号源，声学致动器，麦克风，次级路径和估计单元。自适应滤波器接收表示噪声的参考信号，并且响应于接收的参考信号提供补偿信号。信号源提供测量信号。声学执行器将补偿信号和测量信号辐射到收听位置。麦克风接收在收听位置处的辐射补偿信号，辐射测量信号和噪声信号的叠加的第一信号，并响应于接收的第一信号提供麦克风信号。次路径包括二次路径系统，其表示自适应滤波器的输出和麦克风的输出之间的信号传输路径。估计单元响应于测量信号和麦克风信号来估计辅路径系统的传输特性。

10. 发明申请

US20100146026A1 SUB-BAND SIGNAL PROCESSING 有权
标题翻译：子带信号处理
公开(公告)号：US20100146026A1
公开(公告)日：2010-06-10
申请号：US12633425
申请日：2009-12-08
申请人： Markus Christoph
发明人： Markus Christoph
IPC分类号： G06F17/17
CPC分类号： H03H17/0272 , G06F17/17 , H03H17/0657 , H03H17/0664
摘要： An apparatus for sub-band processing of an input signal includes an analysis filter bank, signal processors and a synthesis filter bank. The analysis filter bank includes first and second signal branches for decomposing the input signal into two sub-band signals. The first signal branch includes a decimation filter connected upstream of a down-sampling unit and a basis filter. The second branch includes an all-pass filter and a subtractor that is connected downstream of the all-pass filter and the basis filter in the first signal branch via an up-sampling unit and a subsequent interpolation filter. At least one of the decimation filter and the interpolation filter is an infinite impulse response filter, and the all-pass filter has a phase response that compensates for a phase response of at least one of the decimation filter and the interpolation filter.
摘要翻译：用于输入信号的子带处理的装置包括分析滤波器组，信号处理器和合成滤波器组。分析滤波器组包括用于将输入信号分解成两个子带信号的第一和第二信号分支。第一信号分支包括连接在下采样单元的上游的抽取滤波器和基滤波器。第二分支包括全通滤波器和减法器，其经由上采样单元和随后的内插滤波器连接在第一信号分支中的全通滤波器和基滤波器的下游。抽取滤波器和内插滤波器中的至少一个是无限脉冲响应滤波器，全通滤波器具有补偿抽取滤波器和内插滤波器中的至少一个的相位响应的相位响应。

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