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    • 12. 发明授权
    • Broadcast receiver
    • 广播接收机
    • US07184726B2
    • 2007-02-27
    • US09822835
    • 2001-04-02
    • Koji Shibata
    • Koji Shibata
    • H04B1/18H04H1/00
    • H04H40/18H03J1/0066H03J1/0091H04H2201/20
    • A broadcast receiver which detects the reception status of radio waves from other stations without deteriorating the reception status of a currently-receiving station, in digital broadcasting where consecutive time series data is transmitted. The amount of time-based interleave applied to the currently-receiving data is determined so that the reception status of the radio waves from other stations is detected while the reception of the currently-receiving broadcast station is interrupted within the extent where missing data can be recovered by such interleave and error correction processing on demodulation.
    • 在发送连续时间序列数据的数字广播中,检测来自其他站的无线电波的接收状态而不恶化当前接收台的接收状态的广播接收机。 确定应用于当前接收数据的基于时间的交织的量,使得当在当前接收的广播站的接收被中断的范围内检测到来自其他站的无线电波的接收状态,其中丢失数据可能在 通过对解调的这种交错和纠错处理来恢复。
    • 17. 发明授权
    • Apparatus for measuring S/N ratio of composite video signal
    • 用于测量复合视频信号的S / N比的装置
    • US06356302B1
    • 2002-03-12
    • US09166796
    • 1998-10-06
    • Yasuo KawakamiKoji ShibataYutaka MiyaharaTadao Nuka
    • Yasuo KawakamiKoji ShibataYutaka MiyaharaTadao Nuka
    • H04N1700
    • H04N17/00
    • An S/N ratio measuring method of a video signal which is suitable for the formation of an IC and can precisely detect a fluctuation of an S/N ratio of a video signal at high response speed while suppressing the total cost and a system based on this method. In operation, a composite video signal is received, a noise density in a predetermined period of the composite video signal is detected, and an S/N ratio of a video signal included in the composite video signal is recognized basis on the detected noise density. The S/N ratio measuring system has a demodulator for demodulating the composite video signal from the reception signal and a counter for counting noises which are generated in a predetermined period of time of the composite video signal and recognizes the S/N ratio of the video signal included in the composite video signal based on a count value obtained.
    • 适用于形成IC的视频信号的S / N比测量方法,并且可以在抑制总成本的同时精确地检测高响应速度的视频信号的S / N比的变动,并且基于 这种方法。 在操作中,接收复合视频信号,检测复合视频信号的预定周期中的噪声密度,并且基于检测到的噪声密度来识别复合视频信号中包括的视频信号的S / N比。 S / N比测量系统具有用于解调来自接收信号的复合视频信号的解调器和用于对在复合视频信号的预定时间段内产生的噪声进行计数的计数器,并识别视频的S / N比 基于获得的计数值,复合视频信号中包含的信号。
    • 18. 发明授权
    • Discharge lamp igniting apparatus for performing a feedback control of a
discharge lamp and the like
    • 用于进行放电灯的反馈控制的放电灯点火装置等
    • US5910713A
    • 1999-06-08
    • US129848
    • 1998-08-06
    • Kenichiro NishiSatoshi NagaiKentaro EguchiTakeshi AraiJun BunyaKazutaka ShimizuKoji ShibataIsamu Ogawa
    • Kenichiro NishiSatoshi NagaiKentaro EguchiTakeshi AraiJun BunyaKazutaka ShimizuKoji ShibataIsamu Ogawa
    • H05B37/03H05B41/285H05B41/292H05B41/392G05F1/00
    • H05B41/2851H05B37/03H05B41/2855H05B41/2925H05B41/3921Y02B20/208Y10S315/04
    • A current flowing through a discharge lamp 4 is detected by a current detecting circuit 5, and the detected current is outputted as a lamp current signal A to a feedback control circuit 7 where a difference between the lamp current signal A and the dimming control signal B is obtained and amplified, and then a amplified signal D is outputted to an adder 12 which adds the amplified signal D to the dimming control signal B to constitute a control signal E. The control signal is fed back to a high frequency power supply 2. When a comparing circuit 15 detects that the light level of the dimming control signal B with respect to the full light becomes higher than or equal to 40% to 60%, the feedback circuit is disconnected by operating a switch 13 provided between an error amplifying circuit 9 and an adder 12 to stop the feedback control. When a light level of a discharge lamp 104 is smaller than or equal to a predetermined value, first and second reference voltage 108a and 108b are switched by a two-stage switching circuit 109. A comparator 107 compares a detection voltage 106 of the discharge lamp 104 with the first reference voltage 108a, or the detection voltage 106 with the second reference voltage 108b. When the voltage of the discharge lamp 104 becomes high, a control circuit 110 supplies to a high frequency power supply 102, a control signal 112 for interrupting, or reducing an output of the high frequency power supply 102.
    • 通过电流检测电路5检测流过放电灯4的电流,将检测电流作为灯电流信号A输出到反馈控制电路7,反馈控制电路7将灯电流信号A与调光控制信号B 然后将放大信号D输出到加法器12,加法器12将放大的信号D与调光控制信号B相加,构成控制信号E.控制信号反馈给高频电源2。 当比较电路15检测到调光控制信号B相对于全光的光电平变得高于或等于40%至60%时,通过操作设置在误差放大电路之间的开关13来断开反馈电路, 9和加法器12,以停止反馈控制。 当放电灯104的亮度小于或等于预定值时,第一和第二参考电压108a和108b由两级切换电路109切换。比较器107比较放电灯104的检测电压106 104具有第一参考电压108a,或具有第二参考电压108b的检测电压106。 当放电灯104的电压变高时,控制电路110向高频电源102提供控制信号112,用于中断或降低高频电源102的输出。