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1. 发明授权

US5426704A Noise reducing apparatus 失效
标题翻译：降噪装置
公开(公告)号：US5426704A
公开(公告)日：1995-06-20
申请号：US94449
申请日：1993-07-21
申请人： Manpei Tamamura , Eiji Shibata , Hiroshi Iidaka , Manabu Nohara
发明人： Manpei Tamamura , Eiji Shibata , Hiroshi Iidaka , Manabu Nohara
IPC分类号： G10K11/178 , A61F11/06
CPC分类号： G10K11/1784 , G10K2210/121 , G10K2210/1282 , G10K2210/3031 , G10K2210/3032 , G10K2210/3045 , G10K2210/3053 , G10K2210/3214 , G10K2210/3217 , G10K2210/512
摘要： A noise reducing apparatus which is particularly effective to reduce periodic noise with the construction simplified very much is disclosed. The noise reducing apparatus comprises a microphone, an adaptive filter for generating a signal to reduce noise inputted to the microphone, transfer characteristic compensation means for generating a signal to compensate for a transfer characteristic when the signal generated from the adaptive filter comes the microphone, a synchronizing pulse generation circuit for generating a pulse signal synchronized with the period of the noise, a pulse interval detection circuit for detecting the interval between pulses of the pulse signal, tap number changeover means for changing over the number of taps of the adaptive filter to a number with which the delay amount of a tapped delay line of the adaptive filter is equal to the interval detected by the pulse interval detection circuit, and a loudspeaker for generating sounds in response to the signal from the adaptive filter. Also a noise reducing apparatus suitable for with an automobile.
摘要翻译：公开了一种噪声降低装置，其特别有效地减少周期性噪声，同时非常简化。降噪装置包括麦克风，用于产生信号以减少输入到麦克风的噪声的自适应滤波器，用于当从自适应滤波器产生的信号到达麦克风时产生信号以补偿传送特性的传输特性补偿装置，同步脉冲发生电路，用于产生与噪声周期同步的脉冲信号;脉冲间隔检测电路，用于检测脉冲信号的脉冲间隔;抽头数转换装置，用于将自适应滤波器的抽头数转换为自适应滤波器的抽头延迟线的延迟量等于由脉冲间隔检测电路检测的间隔的数字，以及响应于来自自适应滤波器的信号产生声音的扬声器。还有一种适用于汽车的降噪装置。

2. 发明授权

US5553154A Vehicle internal noise reduction system and the method thereof 失效
标题翻译：车内降噪系统及其方法
公开(公告)号：US5553154A
公开(公告)日：1996-09-03
申请号：US357118
申请日：1994-12-16
申请人： Manpei Tamamura , Hiroshi Iidaka , Eiji Shibata
发明人： Manpei Tamamura , Hiroshi Iidaka , Eiji Shibata
IPC分类号： B60R11/02 , G06F17/10 , G10K11/178 , H03H17/00 , H03H17/02 , H03H21/00 , A61F11/06 , H03B29/00
CPC分类号： G10K11/1784 , G10K2210/1282 , G10K2210/3012 , G10K2210/3021 , G10K2210/30391 , G10K2210/3045
摘要： Pulses synchronized with the period of the noise are generated and inputted to the adaptive filter. On the other hand, the tap number of the delay line of the adaptive filter is terminated at a tap number which is equal to the interval of the inputted pulse, whereby the number of times for calculation at the adaptive filter can be substantially reduced. Furthermore, in case where the tap number of the adaptive filter is changed according to the change of the period of the noise sound, the filter coefficient for cutting the high frequency domain is convoluted into the tap value of the adaptive filter, whereby noises caused by the change of the tap number can be eliminated even when the tap number of the adaptive filter is changed.
摘要翻译：产生与噪声周期同步的脉冲并输入到自适应滤波器。另一方面，自适应滤波器的延迟线的抽头数以等于输入脉冲的间隔的抽头数终止，从而可以显着地减少自适应滤波器处的计算次数。此外，在根据噪声的周期的变化来改变自适应滤波器的抽头数的情况下，将用于切断高频域的滤波器系数卷积成自适应滤波器的抽头值，由此产生噪声即使自适应滤波器的抽头号发生变化，也可以消除抽头号的变化。

3. 发明授权

US5488667A Vehicle internal noise reduction system 失效
标题翻译：车内降噪系统
公开(公告)号：US5488667A
公开(公告)日：1996-01-30
申请号：US180995
申请日：1994-01-14
申请人： Manpei Tamamura , Hiroshi Iidaka , Eiji Shibata
发明人： Manpei Tamamura , Hiroshi Iidaka , Eiji Shibata
IPC分类号： B60R11/02 , F01N1/00 , G10K11/178 , H03H17/00 , H03H21/00 , H04B3/04 , G10K11/16
CPC分类号： G10K11/1786 , G10K2210/117 , G10K2210/1282 , G10K2210/3033 , G10K2210/3045 , G10K2210/3046 , G10K2210/511
摘要： The vehicle internal noise reduction system characterized in attenuating the internal noises by generating optimum canceling sounds from speakers disposed in the passenger compartment by varying the canceling sounds with a good balance according to vehicle operating conditions as changing rapidly.
摘要翻译：车辆内部噪声降低系统，其特征在于通过根据车辆操作条件改变快速改变取消声音，通过从设置在乘客室中的扬声器产生最佳消除声音来衰减内部噪声。

4. 发明授权

US5602927A Vehicle internal noise reduction system and the method thereof 失效
标题翻译：车内降噪系统及其方法
公开(公告)号：US5602927A
公开(公告)日：1997-02-11
申请号：US358390
申请日：1994-12-19
申请人： Manpei Tamamura , Hiroshi Iidaka , Eiji Shibata
发明人： Manpei Tamamura , Hiroshi Iidaka , Eiji Shibata
IPC分类号： H04B3/04 , B60R11/02 , G06F17/10 , G10K11/178 , H03H17/00 , H03H17/02 , H03H21/00 , A61F11/06 , H03B29/00
CPC分类号： G10K11/1784 , G10K2210/1282 , G10K2210/3028 , G10K2210/3033 , G10K2210/3045 , G10K2210/503
摘要： A vehicle internal noise reduction system and the method thereof for reducing a noise sound by producing a canceling sound from a speaker based on a tap value formed and updated in an adaptive filter, the system and the method characterized in forming the tap value of the adaptive filter by convoluting a filter coefficient having a similar band pass characteristic to a frequency characteristic of the speaker into the tap value formed by the adaptive control of the adaptive filter for the purpose of operating the noise reduction system stably without causing distortion or divergence in the system.
摘要翻译：一种车辆内部噪声降低系统及其方法，用于通过基于在自适应滤波器中形成和更新的抽头值产生来自扬声器的消除声音来降低噪声，所述系统和方法的特征在于，形成自适应滤波器的抽头值通过将具有类似带通特性的滤波器系数与扬声器的频率特性卷积成由自适应滤波器的自适应控制形成的抽头值，以稳定地操作降噪系统，而不会引起系统中的失真或发散，来对滤波器进行滤波。

5. 发明授权

US5581619A Vehicle internal noise reduction system and method 失效
标题翻译：车内降噪系统及方法
公开(公告)号：US5581619A
公开(公告)日：1996-12-03
申请号：US264150
申请日：1994-06-22
申请人： Eiji Shibata , Manpei Tamamura , Hiroshi Iidaka
发明人： Eiji Shibata , Manpei Tamamura , Hiroshi Iidaka
IPC分类号： B60R11/02 , F01N1/00 , G10K11/178 , H03H17/00 , H03H17/02 , H03H21/00 , H04B3/04 , G10K11/15 , H04B15/00
CPC分类号： G10K11/178 , G10K2210/128 , G10K2210/3033 , G10K2210/3037 , G10K2210/3054
摘要： In the noise reduction system to attenuate vehicle internal noise sounds by means of generating a canceling sound synthesized with an engine-originated vibration noise source signal, to prevent a remaining noise sound caused by insufficient follow-up characteristic of the adaptive filter updating at a rapid deceleration or acceleration condition of engine, while a generation of canceling sound and an updating of the adaptive filter are interrupted forcibly, the filter coefficient is reset to be a predetermined level and then therefrom a normal adaptation of the adaptive filter is restarted.
摘要翻译：在降噪系统中，通过产生由发动机起始的振动噪声源信号合成的消除声音来衰减车辆内部噪声声音，以防止由快速的自适应滤波器更新的跟踪特性不足引起的剩余噪声减速或加速条件，强制中断自动滤波器的消除声音和更新的生成，将滤波器系数复位为预定电平，然后重新启动自适应滤波器的正常自适应。

6. 发明授权

US5493616A Vehicle internal noise reduction system 失效
标题翻译：车内降噪系统
公开(公告)号：US5493616A
公开(公告)日：1996-02-20
申请号：US214489
申请日：1994-03-18
申请人： Hiroshi Iidaka , Eiji Shibata , Manpei Tamamura
发明人： Hiroshi Iidaka , Eiji Shibata , Manpei Tamamura
IPC分类号： B60R11/02 , F01N1/00 , G10K11/178 , H03H17/00 , H03H17/02 , H03H21/00 , H04B3/04 , H03B29/00 , A61F11/06
CPC分类号： G10K11/1786 , G10K2210/121 , G10K2210/128 , G10K2210/3019 , G10K2210/3033 , G10K2210/3039 , G10K2210/3046
摘要： The vehicle internal noise reduction system is characterized in being able to attenuate the internal noise sounds at a broad area of the passenger compartment by generating optimum canceling sounds from speakers disposed in the passenger compartment under any operating conditions.
摘要翻译：车辆内部噪声降低系统的特征在于能够通过在任何操作条件下从布置在乘客室中的扬声器产生最佳的消除声音来衰减乘客舱的宽阔区域的内部噪声声音。

7. 发明授权

US5473699A Vehicle internal noise reduction system 失效
标题翻译：车内降噪系统
公开(公告)号：US5473699A
公开(公告)日：1995-12-05
申请号：US234018
申请日：1994-04-28
申请人： Manpei Tamamura , Hiroshi Iidaka , Eiji Shibata
发明人： Manpei Tamamura , Hiroshi Iidaka , Eiji Shibata
IPC分类号： G10K11/178 , H03H17/00 , H03H21/00 , H04B3/04 , A61F11/06 , H03B29/00
CPC分类号： G10K11/1784 , G10K2210/1282 , G10K2210/3042 , G10K2210/3045 , G10K2210/503
摘要： A primary source is synthesized with a filter coefficient of a first adaptive filter into a canceling signal. The canceling signal is converted into a canceling sound and the canceling sound is generated from a speaker. A result of interference of the canceling sound with a noise sound is detected by a microphone as an error signal. The error signal is subjected to a sum of convolution products with the filter coefficient of the first adaptive filter in a LMS calculation circuit and the filter coefficient is updated therein. On the other hand, the error signal is subjected to a sum of convolution products with the canceling signal in another LMS calculation circuit and a filter coefficient of a second adaptive filter is updated. The updated filter coefficient of the second adaptive filter is sent to a compensation coefficient synthesizing circuit and therein the compensation coefficient is corrected by the filter coefficient. The corrected compensation coefficient updates the filter coefficient of the first adaptive filter. As a result, the first adaptive filter is automatically adjusted so as to reflect actual transmission characteristics in the passenger compartment, whereby a noise reduction with a stable performance is always obtained under any conditions of the passenger compartment.
摘要翻译：一个主源被合成为具有第一自适应滤波器的滤波器系数到消除信号中。消除信号被转换成消除声音，并且从扬声器产生消除声音。消除声音与噪声的干扰的结果被麦克风检测为误差信号。误差信号在LMS计算电路中经受第一自适应滤波器的滤波器系数的卷积积和，并且其中更新滤波器系数。另一方面，误差信号在另一个LMS计算电路中经受消除信号的卷积积和，并且更新第二自适应滤波器的滤波器系数。将第二自适应滤波器的更新的滤波器系数发送到补偿系数合成电路，其中补偿系数由滤波器系数校正。校正补偿系数更新第一自适应滤波器的滤波器系数。结果，第一自适应滤波器被自动调整以反映乘客室中的实际传输特性，从而在乘客舱的任何条件下总是获得具有稳定性能的降噪。

8. 发明授权

US5485523A Active noise reduction system for automobile compartment 失效
标题翻译：汽车车厢主动降噪系统
公开(公告)号：US5485523A
公开(公告)日：1996-01-16
申请号：US32057
申请日：1993-03-16
申请人： Manpei Tamamura , Hiroshi Iidaka , Kazuyuki Kondo , Keitaro Yokota
发明人： Manpei Tamamura , Hiroshi Iidaka , Kazuyuki Kondo , Keitaro Yokota
IPC分类号： F02B75/02 , G10K11/178 , G10K11/16
CPC分类号： G10K11/1784 , G10K11/1788 , F02B2075/027 , G10K2210/121 , G10K2210/1282 , G10K2210/30232 , G10K2210/3032 , G10K2210/3045 , G10K2210/3221
摘要： In an automobile compartment noise reduction system, an ignition signal transforming circuit processes an ignition pulse signal to obtain a vibration noise source signal with a frequency spectrum composed of 0.5.times.n (integers) order components of the engine r.p.m. as the primary source signal. The signal is applied to an adaptive filter and an LMS calculating circuit via a speaker-microphone transmission characteristic correcting circuit. The primary source signal is synthesized by the filter into a cancel signal and then outputted through a speaker as canceling sound. The canceling sound is received by at least one error microphone at a noise receiving point as an error signal. The error signal is applied to the LMS calculating circuit. The LMS circuit updates the filter coefficients of the adaptive filter on the basis of the primary source signal and the error signal so that the error signal can be minimized. The noise reduction system has high reliability with low cost, and is easy to mount.
摘要翻译：在汽车室噪声降低系统中，点火信号变换电路处理点火脉冲信号，以获得具有由发动机r.p.m的0.5×n（整数）次序分量组成的频谱的振动噪声源信号。作为主要源信号。信号通过扬声器 - 麦克风传输特性校正电路施加到自适应滤波器和LMS计算电路。主源信号由滤波器合成消除信号，然后通过扬声器作为消除声音输出。抵消声音由噪声接收点处的至少一个误差麦克风接收作为误差信号。误差信号被应用于LMS计算电路。 LMS电路基于主源信号和误差信号来更新自适应滤波器的滤波器系数，使得误差信号可以最小化。降噪系统具有高可靠性，成本低，易于安装。

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