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    • 5. 发明授权
    • Digital to analog converter using B spline function
    • 使用B样条函数的数模转换器
    • US06639535B1
    • 2003-10-28
    • US09623073
    • 2000-10-25
    • Kazuo ToraichiKouichi Wada
    • Kazuo ToraichiKouichi Wada
    • H03M166
    • H03M1/66
    • A digital-analog converter for producing less distorted output waveforms without the need for an increase in the operating speed of components. A D/A converter 1 comprises a memory 10, an address counter 12, a B spline function generation circuit 14, four sampling function generation circuits 16, three delay circuits 18, four amplifiers 20, and three adding circuits 22, 24 and 26. Four items of digital data supplied one after another in the predetermined time interval T are stored in the memory 10. The gain of each of the four amplifiers 20 is set according to the corresponding digital data. The four sampling function generation circuits 16 generate signal waveforms of the sampling function, which appear individually in points a time T away from one another. The signal waveforms are amplified in the amplifier 20 and added to produce an analog signal associated with the interpolation value.
    • 数字模拟转换器,用于产生较小失真的输出波形,而不需要增加组件的运行速度。 AD / A转换器1包括存储器10,地址计数器12,B样条函数产生电路14,四个采样函数产生电路16,三个延迟电路18,四个放大器20和三个加法电路22,24和26。 在预定时间间隔T中一个接一个地提供的数字数据的项目被存储在存储器10中。四个放大器20中的每个的增益根据相应的数字数据被设置。 四个采样函数发生电路16产生采样功能的信号波形,它们以时间T彼此分开出现。 信号波形在放大器20中放大并相加以产生与内插值相关联的模拟信号。
    • 6. 发明授权
    • Sampling function generator
    • 采样函数发生器
    • US06392398B1
    • 2002-05-21
    • US09623074
    • 2000-10-13
    • Kazuo ToraichiKouichi Wada
    • Kazuo ToraichiKouichi Wada
    • G01R2300
    • G06F17/10G06F17/17
    • A sampling function generator capable of providing continuous output corresponding to a sampling function. The sampling function generator 1 comprises a B spline function generation circuit 10, delay circuits 12 and 14, inverting amplifiers 16 and 18, and adding circuits 20 and 22. The B-spline function generation circuit 10 continuously produces signal waveforms according to a third order B spline function. After delayed by predetermined time or attenuated to 1/4 amplitude and inverted, the signal waveforms are combined in the adding circuits 20 and 22 to form a signal waveforms of a sampling function that is differentiable once over the range and has values of local support.
    • 一种能够提供对应于采样功能的连续输出的采样函数发生器。 采样函数发生器1包括B样条函数产生电路10,延迟电路12和14,反相放大器16和18以及加法电路20和22.B样条函数产生电路10根据三阶连续产生信号波形 B样条函数。 在延迟预定时间或衰减到1/4幅度并反相之后,信号波形在加法电路20和22中组合,以形成可在一定范围内可微分并具有局部支持值的采样函数的信号波形。