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    • 6. 发明授权
    • Nonlinear mapping in digital-to-analog and analog-to-digital converters
    • 数模转换器和模数转换器的非线性映射
    • US08018363B2
    • 2011-09-13
    • US12557352
    • 2009-09-10
    • Todd L. BrooksKevin L. MillerJosephus A. Van Engelen
    • Todd L. BrooksKevin L. MillerJosephus A. Van Engelen
    • H03M3/00
    • H03M7/3013
    • In a high-fidelity digital modulator, a mapper is provided to minimize quantization noise, jitter, and cross-talk between multiple digital-to-analog or analog-to-digital converters. The mapper receives a quantized level from a quantizer and maps the quantized level to an output sequence. The mapper includes a table defining multiple sequences corresponding to each quantized level. Each sequence includes two or more symbols, having one of multiple values. The mapper also includes a generator that selects one of the multiple sequences as the output sequence. The last symbol of a first output sequence is equal to the first symbol of the next output sequence and so on. The generator selects the output sequence by alternating between a first and a second sequence for each quantized level received. The generator selects the output sequence by alternating between sequences having a positive and a negative common mode energy for each odd valued quantized level received.
    • 在高保真数字调制器中,提供映射器以最小化多个数模转换器或模数转换器之间的量化噪声,抖动和串扰。 映射器从量化器接收量化电平,并将量化电平映射到输出序列。 映射器包括定义对应于每个量化级别的多个序列的表。 每个序列包括具有多个值之一的两个或多个符号。 映射器还包括选择多个序列之一作为输出序列的发生器。 第一个输出序列的最后一个符号等于下一个输出序列的第一个符号,依此类推。 发生器通过在接收到的每个量化级别的第一和第二序列之间交替来选择输出序列。 发生器通过在接收到的每个奇数值量化电平具有正和负共模能量的序列之间交替来选择输出序列。
    • 9. 发明授权
    • Tape head fine positioning system for a tape backup drive
    • 磁带头精细定位系统,用于磁带备份驱动器
    • US5331490A
    • 1994-07-19
    • US606887
    • 1990-10-31
    • Alan J. RichardsWilliam A. GodetteHelmuth O. KroogKevin L. Miller
    • Alan J. RichardsWilliam A. GodetteHelmuth O. KroogKevin L. Miller
    • G11B15/675G11B25/06G11B33/02G11B5/58
    • G11B33/02G11B15/67521G11B25/063
    • The present invention provides a back-up tape drive having a precision molded chassis with a fine positioning system for a tape head. This system includes a follower nut threadingly mounted on a lead screw that is bi-directionally rotated by a stepper motor. A lever arm engages the follower nut in a manner such that torsional moments between the forces of the follower nut and lever arm are minimized. The other end of the lever arm engages a tape head mounting unit. The lever arm pivotally engages the chassis at a predetermined midpoint of the lever arm such that a mechanical advantage is derived. The positioning system is designed so the forces acting on the tape head mounting unit are aligned to minimize the torsional forces acting on the tape head mounting unit. The tape head mounting unit further includes reference features that reduce the need for azimuth and zenith adjustment.
    • 本发明提供了一种具有精密模制底盘的备用磁带驱动器,其具有用于磁带头的精细定位系统。 该系统包括螺纹安装在由步进电机双向旋转的导螺杆上的从动螺母。 杠杆臂以使得从动螺母和杠杆臂的力之间的扭转力矩最小化的方式与从动螺母接合。 杠杆臂的另一端与磁带头安装单元接合。 杠杆臂在杠杆臂的预定中点处枢转地接合底盘,从而得到机械优点。 定位系统被设计成使作用在磁带头安装单元上的力被对准,以使作用在带头安装单元上的扭转力最小化。 磁带头安装单元还包括减少对方位角和天顶调整的需要的参考特征。