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9 条记录 (耗时 0.012 秒)

    Apparatus for varying a sampling rate in a digital demodulator
    4.
    发明授权
    Apparatus for varying a sampling rate in a digital demodulator 失效
    用于改变数字解调器中采样率的装置

    公开(公告)号：US5956376A

    公开(公告)日：1999-09-21

    申请号：US775116

    申请日：1996-12-30

    申请人： Kazuyoshi Nakaya ,  Yoshiyuki Tabata

    发明人： Kazuyoshi Nakaya ,  Yoshiyuki Tabata

    IPC分类号： H04L27/38 ,  H03M1/12 ,  H04B1/00 ,  H04B1/28 ,  H04L1/00 ,  H04L7/033 ,  H04L27/22 ,  H04L27/06

    CPC分类号： H04B1/28 ,  H04L1/0001 ,  H04L27/22 ,  H04B1/00 ,  H04L7/0334

    摘要： A framing and voice decoder part outputs an error information. An error ratio monitoring part monitors a bit error ratio based on the error information. A sampling rate changing part decides a sampling rate based on the bit error ratio and changes a number of bits of each shift register in the differential detector part to adapt the sampling rate. A sampling clock selector part selects one clock signal among four different frequency clock signals based on the decision of the sampling rate changing part and gives selected clock signal to the differential detector part as a sampling clock. The differential detector part makes demodulation in DQPSK (Differential Quadrilateral Phase Shift Keying). Since the error ratio is always maintained within a predetermined extent, a good voice quality is obtained. Since the sampling rate will not increase to unnecessarily high levels, power saving can be achieved and a consumption of batteries is reduced.

    摘要翻译： 帧和语音解码器部分输出错误信息。 错误率监视部分基于错误信息来监视误码率。 采样率改变部分基于误码率来确定采样率，并且改变差分检测器部分中每个移位寄存器的位数以适应采样率。 采样时钟选择器部分基于采样率改变部分的判定选择四个不同频率时钟信号中的一个时钟信号，并将所选择的时钟信号作为采样时钟提供给差分检测器部分。 差分检测器部分通过DQPSK（差分四边形相移键控）进行解调。 由于误差率始终保持在预定范围内，所以获得良好的语音质量。 由于采样率不会增加到不必要的高水平，因此可以实现节电并减少电池的消耗。

    Method for receiving digital radio signals and a digital radio signals receiver
    7.
    发明授权
    Method for receiving digital radio signals and a digital radio signals receiver 失效
    接收数字无线电信号的方法和数字无线电信号接收机

    公开(公告)号：US5963590A

    公开(公告)日：1999-10-05

    申请号：US345665

    申请日：1994-11-28

    申请人： Kazuyoshi Nakaya ,  Yoshiyuki Tabata

    发明人： Kazuyoshi Nakaya ,  Yoshiyuki Tabata

    IPC分类号： H04L27/38 ,  H03M1/12 ,  H04B1/00 ,  H04B1/28 ,  H04L1/00 ,  H04L7/033 ,  H04L27/22 ,  H04B3/46 ,  H04B17/00

    CPC分类号： H04B1/28 ,  H04L1/0001 ,  H04L27/22 ,  H04B1/00 ,  H04L7/0334

    摘要： A framing and voice decoder part outputs an error information. An error ratio monitoring part monitors a bit error ratio based on the error information. A sampling rate changing part decides a sampling rate based on the bit error ratio and changes a number of bits of each shift register in the differential detector part to adapt the sampling rate. A sampling clock selector part selects one clock signal among four different frequency clock signals based on the decision of the sampling rate changing part and gives selected clock signal to the differential detector part as a sampling clock. The differential detector part makes demodulation in DQPSK (Differential Quadrilateral Phase Shift Keying). Since the error ratio is always maintained within a predetermined extent, a good voice quality is obtained. Since the sampling rate will not increase to unnecessarily high levels, power saving can be achieved and a consumption of batteries is reduced.

    摘要翻译： 帧和语音解码器部分输出错误信息。 错误率监视部分基于错误信息来监视误码率。 采样率改变部分基于误码率来确定采样率，并且改变差分检测器部分中每个移位寄存器的位数以适应采样率。 采样时钟选择器部分基于采样率改变部分的判定选择四个不同频率时钟信号中的一个时钟信号，并将所选择的时钟信号作为采样时钟提供给差分检测器部分。 差分检测器部分通过DQPSK（差分四边形相移键控）进行解调。 由于误差率始终保持在预定范围内，所以获得良好的语音质量。 由于采样率不会增加到不必要的高水平，因此可以实现节电并减少电池的消耗。

    Arc welding control device
    9.
    发明申请
    Arc welding control device 审中-公开
    电弧焊控制装置

    公开(公告)号：US20070034617A1

    公开(公告)日：2007-02-15

    申请号：US10568990

    申请日：2005-06-21

    申请人： Hidetoshi Oyama ,  Yoshiyuki Tabata ,  Yasumichi Muto ,  Yasushi Mukai

    发明人： Hidetoshi Oyama ,  Yoshiyuki Tabata ,  Yasumichi Muto ,  Yasushi Mukai

    IPC分类号： B23K9/10

    CPC分类号： H05K7/20909 ,  B23K9/325

    摘要： In the conventional arc welding control unit, since the air of the outside of the equipment is applied directly to the whole of the main semiconductor for cooling, there is found a problem that dust, welding fumes and the like can accumulate on or adhere to the conductive portions of the inside of the equipment, which takes time for maintenance of the equipment. To solve this, according to the invention, there is provided an arc welding control unit having a heat radiating unit built in the box body thereof for discharging the air heated by a heat generating first electrical element to the outside. The heat radiating unit has a tunnel-type shape including an outer peripheral portion for defining a cavity portion allowing the air to flow therethrough, whereby dust, welding fumes and the like can be prevented from accumulating on or adhering to the conductive portions of the inside of the equipment.

    摘要翻译： 在传统的电弧焊接控制单元中，由于设备外部的空气直接施加到整个主半导体进行冷却，因此存在灰尘，焊接烟雾等可能积聚在或附着于 设备内部的导电部分，这需要维护设备的时间。 为了解决这个问题，根据本发明，提供了一种电弧焊接控制单元，其具有内置在其箱体中的用于将由发热第一电气元件加热的空气排放到外部的散热单元。 散热单元具有隧道式形状，其包括用于限定空气流过其中的空腔部分的外周部分，由此可以防止灰尘，焊接烟雾等积聚在内部或其内部的导电部分上 的设备。