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    • 6. 发明授权
    • Demodulation circuit, a decode circuit and a digital PLL circuit for an optical disc apparatus
    • 解调电路,解码电路和用于光盘装置的数字PLL电路
    • US06359949B1
    • 2002-03-19
    • US09620054
    • 2000-07-20
    • Isao OkadaTsuyoshi Hirabuki
    • Isao OkadaTsuyoshi Hirabuki
    • H04L2300
    • G11B27/24G11B20/10009G11B20/1419G11B20/18G11B27/3027G11B2220/218G11B2220/2545H03M5/12
    • An optical disc apparatus has a demodulation circuit performing an FSK demodulation by being provided with a binary signal which is obtained by binarizing a signal reproduced from an optical disc on which an FSK modulation signal is previously recorded. An edge interval of the binary signal is measured. An FSK modulation component is obtained from a difference between a measured edge interval value and a previously determined edge interval reference value. A demodulation value is obtained based on a moving average of the FSK modulation component. A moving average of the demodulation value is compared with a reference value so as to obtain a binary FSK demodulation signal. Additionally, the optical disc apparatus includes a decode circuit for decoding binary data from a biphase code signal which is reproduced from an optical disc and to be inverted at an end of each bit. When an inversion of the biphase code signal is not performed at an end of a bit, the decode circuit corrects the binary data immediately before or after the end of the bit. Further, the optical disc apparatus includes a digital PLL circuit which divides a frequency of a demodulated signal reproduced from the optical disc by a predetermined dividing ratio. A clock signal is obtained based on an edge interval value of the divided modulated signal.
    • 光盘装置具有通过提供二进制信号来执行FSK解调的解调电路,二进制信号是通过二值化从先前记录有FSK调制信号的光盘再现的信号而获得的。 测量二进制信号的边沿间隔。 从测量的边缘间隔值和预先确定的边缘间隔参考值之间的差获得FSK调制分量。 基于FSK调制分量的移动平均值获得解调值。 将解调值的移动平均值与参考值进行比较,以获得二进制FSK解调信号。 此外,光盘装置包括一个解码电路,用于从一个从光盘再现的双相码信号中解码二进制数据,并在每个位的末尾被反相。 当在比特结束时不执行双相码信号的反转时,解码电路在比特结束之前或之后立即校正二进制数据。 此外,光盘装置包括数字PLL电路,其将从光盘再现的解调信号的频率除以预定的分频比。 基于分频调制信号的边沿间隔值获得时钟信号。
    • 7. 发明授权
    • Demodulation circuit, a decode circuit and a digital PLL circuit for an optical disc apparatus
    • 解调电路,解码电路和用于光盘装置的数字PLL电路
    • US06175542B1
    • 2001-01-16
    • US09084359
    • 1998-05-22
    • Isao OkadaTsuyoshi Hirabuki
    • Isao OkadaTsuyoshi Hirabuki
    • G11B7005
    • G11B27/24G11B20/10009G11B20/1419G11B20/18G11B27/3027G11B2220/218G11B2220/2545H03M5/12
    • An optical disc apparatus has a demodulation circuit performing an FSK demodulation by being provided with a binary signal which is obtained by binarizing a signal reproduced from an optical disc on which an FSK modulation signal is previously recorded. An edge interval of the binary signal is measured. An FSK modulation component is obtained from a difference between a measured edge interval value and a previously determined edge interval reference value. A demodulation value is obtained based on a moving average of the FSK modulation component. A moving average of the demodulation value is compared with a reference value so as to obtain a binary FSK demodulation signal. Additionally, the optical disc apparatus includes a decode circuit for decoding binary data from a biphase code signal which is reproduced from an optical disc and to be inverted at an end of each bit. When an inversion of the biphase code signal is not performed at an end of a bit, the decode circuit corrects the binary data immediately before or after the end of the bit. Further, the optical disc apparatus includes a digital PLL circuit which divides a frequency of a demodulated signal reproduced from the optical disc by a predetermined dividing ratio. A clock signal is obtained based on an edge interval value of the divided modulated signal.
    • 光盘装置具有通过提供二进制信号来执行FSK解调的解调电路,二进制信号是通过二值化从先前记录有FSK调制信号的光盘再现的信号而获得的。 测量二进制信号的边沿间隔。 从测量的边缘间隔值和预先确定的边缘间隔参考值之间的差获得FSK调制分量。 基于FSK调制分量的移动平均值获得解调值。 将解调值的移动平均值与参考值进行比较,以获得二进制FSK解调信号。 此外,光盘装置包括一个解码电路,用于从一个从光盘再现的双相码信号中解码二进制数据,并在每个位的末尾被反相。 当在比特结束时不执行双相码信号的反转时,解码电路在比特结束之前或之后立即校正二进制数据。 此外,光盘装置包括数字PLL电路,其将从光盘再现的解调信号的频率除以预定的分频比。 基于分频调制信号的边沿间隔值获得时钟信号。