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    • 65. 发明授权
    • Signal reproducing apparatus having waveform equalizing function
    • 具有波形均衡功能的信号再生装置
    • US5663844A
    • 1997-09-02
    • US156408
    • 1993-11-19
    • Makoto GohdaShinichi Yamashita
    • Makoto GohdaShinichi Yamashita
    • G11B5/035G11B20/06H04L25/03
    • H04L25/03019G11B20/06G11B5/035
    • A circuit is provided for emphasizing or suppressing both a frequency corresponding to an upper sideband and a frequency corresponding to a lower sideband with respect to a frequency corresponding to the carrier of a frequency-modulated signal in equalizing the frequency-modulated signal reproduced from the recording medium. With this arrangement, it is possible to effectively compensate for the nonlinearity of a magnetic recording and reproducing system even in the case of a wide deviation. Also, the envelope levels of the portions of a frequency-modulated signal which are formed by frequency-modulating portions of a signal whose levels differ from each other, are extracted to adjust the equalizing characteristics of the equalizing circuit in accordance with the difference between the levels, whereby variations in the characteristics of a reproduction equalizing circuit due to variations with time can be appropriately compensated for.
    • 提供一种电路,用于相对于与频率调制信号的载波相对应的频率来强调或抑制对应于上边带的频率和对应于下边带的频率,以均衡从记录再现的频率调制信号 中。 利用这种布置,即使在宽偏差的情况下,也可以有效地补偿磁记录和再现系统的非线性。 此外,提取通过其电平彼此不同的信号的频率调制部分形成的频率调制信号的部分的包络电平,以根据所述均衡电路的差异来调整均衡电路的均衡特性 电平,由此可以适当地补偿由于随时间变化的再现均衡电路的特性的变化。
    • 66. 发明授权
    • Digital information restoring device including period detector
    • 数字信息恢复装置,包括周期检测器
    • US5623376A
    • 1997-04-22
    • US233536
    • 1994-04-26
    • Shingo IkedaShinichi Yamashita
    • Shingo IkedaShinichi Yamashita
    • G11B20/14G11B20/22G11B27/32G11B5/09G11B20/16
    • G11B20/1419G11B27/323G11B20/225
    • A digital information restoring device is arranged to detect time between level transition points of a digital signal which indicates digital information by means of variations in its period, output the resultant period data, calculate an average value of at least two period data among the output period data, and compare the average value with the aforesaid period data, and restore the digital information. The digital information restoring device is, therefore, capable of restoring the digital information at a high speed without using a high-speed PLL circuit or the like. The digital information restoring device may also be arranged to perform time-axis expansion of only part of the received period data, and input the resultant period data to a computing circuit to restore the digital information.
    • 数字信息恢复装置被配置为通过其周期的变化来检测指示数字信息的数字信号的电平转变点之间的时间,输出合成周期数据,计算输出周期中的至少两个周期数据的平均值 数据,并将平均值与上述周期数据进行比较,并恢复数字信息。 因此,数字信息恢复装置能够在不使用高速PLL电路等的情况下高速恢复数字信息。 数字信息恢复装置还可以被布置为仅执行接收的周期数据的一部分的时间轴扩展,并将合成的周期数据输入到计算电路以恢复数字信息。