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    • 6. 发明授权
    • Equalizer and reproduction signal processing device
    • 均衡器和再生信号处理装置
    • US07321620B2
    • 2008-01-22
    • US10383746
    • 2003-03-10
    • Hiroyuki NakahiraKoichi NaganoKoji OkamotoAkira Yamamoto
    • Hiroyuki NakahiraKoichi NaganoKoji OkamotoAkira Yamamoto
    • H03H7/30H03H7/40H03K5/159
    • H04L25/03038H04L2025/03477H04L2025/03585H04L2025/03617
    • The present invention provides an equalizer capable of accurately compensating for non-linearity of an input signal due to the asymmetry phenomenon, etc., during the disk production process. Two tap coefficients are provided in a coefficient unit. A comparator compares the value of a middle tap signal, which is a reference signal, and a threshold, so as to produce a selection signal based on the comparison result. The coefficient unit selects one of the two tap coefficients as the selected tap coefficient based on the selection signal, and a tap signal is multiplied with the selected tap coefficient. Thus, it is possible to adaptively switch the tap coefficients of the equalizer as a whole based on the value of the middle tap signal, which is the reference signal. Therefore, it is possible to accurately compensate for the non-linearity of the input signal.
    • 本发明提供了一种均衡器,其能够在盘生产过程期间由于不对称现象等而精确地补偿输入信号的非线性。 在系数单元中提供两个抽头系数。 比较器将作为参考信号的中间抽头信号的值与阈值进行比较,以便基于比较结果产生选择信号。 系数单元基于选择信号选择两个抽头系数中的一个作为所选抽头系数,并且抽头信号与选择的抽头系数相乘。 因此,可以基于作为参考信号的中间抽头信号的值来自适应地切换均衡器的抽头系数作为整体。 因此,可以准确地补偿输入信号的非线性。
    • 7. 发明授权
    • Information playback apparatus with an unusual waveform circuit
    • 具有异常波形电路的信息播放装置
    • US06895348B2
    • 2005-05-17
    • US10340273
    • 2003-01-10
    • Akira KawabeKoichi Nagano
    • Akira KawabeKoichi Nagano
    • G11B20/10G11B20/18G11B5/09
    • G11B20/18
    • An unusual waveform detection circuit is a digital-type unusual waveform detection circuit that arbitrarily sets a threshold used for determining an unusual waveform and produces an unusual waveform determination signal by comparing an input signal with the threshold. In producing the unusual waveform determination signal, one of a configuration where a voltage at each of all sampling points is compared with a reference voltage and a configuration where a continuously changing gradient of signal waveform peaks is calculated and is compared with a reference gradient is selectively employed. The unusual waveform detection circuit can easily and accurately detect various unusual waveforms.
    • 异常波形检测电路是数字型异常波形检测电路,其任意设定用于确定异常波形的阈值,并通过将输入信号与阈值进行比较来产生异常波形判定信号。 在产生异常波形确定信号时,将所有采样点中的每一个电压与参考电压进行比较的结构之一以及计算信号波形峰值的连续变化梯度并与参考梯度进行比较的配置选择性地 雇用。 异常波形检测电路可以方便,准确地检测各种异常波形。
    • 10. 发明授权
    • Parallel A/D converter
    • 并行A / D转换器
    • US06798370B1
    • 2004-09-28
    • US10418299
    • 2003-04-18
    • Koichi Nagano
    • Koichi Nagano
    • H03M112
    • H03M1/004H03M1/002H03M1/185H03M1/367
    • A parallel A/D converter includes: a reference-voltage generation circuit for outputting m reference voltages (“m” is an integer of not less than two), each having different voltage values, in response to the bit precision of digital output signals; n comparators (“n” is an integer smaller than “m”); and an encoder for encoding outputs of the n comparators to output the digital output signals. Each of the n comparators compares the magnitude of one of the m reference voltages with that of an analog input signal. Thereby, power consumption can be reduced.
    • 并行A / D转换器包括:基准电压产生电路,用于响应于数字输出信号的位精度,输出m个参考电压(“m”为不小于2的整数),每个参考电压具有不同的电压值; n个比较器(“n”是小于“m”的整数); 以及用于编码n个比较器的输出以输出数字输出信号的编码器。 n个比较器中的每个比较器将m个参考电压之一的幅度与模拟输入信号的幅度进行比较。 从而能够降低功耗。