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    • 3. 发明授权
    • Noise reducing apparatus
    • 降噪装置
    • US5426704A
    • 1995-06-20
    • US94449
    • 1993-07-21
    • Manpei TamamuraEiji ShibataHiroshi IidakaManabu Nohara
    • Manpei TamamuraEiji ShibataHiroshi IidakaManabu Nohara
    • G10K11/178A61F11/06
    • G10K11/1784G10K2210/121G10K2210/1282G10K2210/3031G10K2210/3032G10K2210/3045G10K2210/3053G10K2210/3214G10K2210/3217G10K2210/512
    • 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.
    • 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。
    • 6. 发明授权
    • Active noise reduction system for automobile compartment
    • 汽车车厢主动降噪系统
    • US5485523A
    • 1996-01-16
    • US32057
    • 1993-03-16
    • Manpei TamamuraHiroshi IidakaKazuyuki KondoKeitaro Yokota
    • Manpei TamamuraHiroshi IidakaKazuyuki KondoKeitaro Yokota
    • F02B75/02G10K11/178G10K11/16
    • G10K11/1784G10K11/1788F02B2075/027G10K2210/121G10K2210/1282G10K2210/30232G10K2210/3032G10K2210/3045G10K2210/3221
    • 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.
    • 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。
    • 7. 发明授权
    • Vehicle internal noise reduction system
    • 车内降噪系统
    • US5473699A
    • 1995-12-05
    • US234018
    • 1994-04-28
    • Manpei TamamuraHiroshi IidakaEiji Shibata
    • Manpei TamamuraHiroshi IidakaEiji Shibata
    • G10K11/178H03H17/00H03H21/00H04B3/04A61F11/06H03B29/00
    • G10K11/1784G10K2210/1282G10K2210/3042G10K2210/3045G10K2210/503
    • 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.
    • 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。