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    • 1. 发明授权
    • Waveform data compression apparatus
    • 波形数据压缩装置
    • US5727085A
    • 1998-03-10
    • US528457
    • 1995-09-14
    • Akira ToyamaKazuhiko HakutaMasayoshi NakamuraMasataka Saito
    • Akira ToyamaKazuhiko HakutaMasayoshi NakamuraMasataka Saito
    • G10L19/00G06T9/00G10L19/14H03M7/38G06K9/36
    • G10L19/16G06T9/004
    • In an APC system waveform dam compression apparatus which generates an optimum prediction coefficient utilizing a block calculation process in a first mode and generating prediction data utilizing a block calculation process based on this optimum prediction coefficient in a second mode with respect to a fixed number of blocked waveform data, to make possible use of suitable data in the first prediction calculation process of each block calculation process. A data holding section for holding data corresponding to at least final first waveform data to be used in a final prediction calculation process of a block calculation process in a second mode, and a first selection section for using data held in the data holding section in place of data memorized in a second delay section in each first prediction calculation process of each block calculation process of the next block are provided in an operating circuit.
    • 在APC系统波形坝压缩装置中,利用第一模式中的块计算处理产生最佳预测系数,并且利用第二模式中基于该最佳预测系数的块计算处理相对于固定数量的阻塞产生预测数据 波形数据,以便在每个块计算过程的第一预测计算过程中可能使用合适的数据。 数据保持部分,用于保存对应于要在第二模式中的块计算处理的最终预测计算处理中使用的至少最终的第一波形数据的数据;以及第一选择部分,用于将数据保存部分中保存的数据使用到位 在下一个块的每个块计算处理的每个第一预测计算处理中的第二延迟部中存储的数据被提供在操作电路中。
    • 7. 发明授权
    • Noise shaper
    • 噪音整形器
    • US06515601B2
    • 2003-02-04
    • US09929171
    • 2001-08-14
    • Yukio FukuharaAkira Toyama
    • Yukio FukuharaAkira Toyama
    • H03M120
    • H03M3/328H03M3/43H03M3/448H03M3/454H03M7/3008H03M7/3028H03M7/3035H03M7/304
    • A pole-shifted noise shaper whose transfer function has a Z-plane in which the pole has been shifted out of the origin. The noise shaper suppresses idle pattern. The noise shaper has a dither adder (17) placed immediately before a quantizer (16) to add a dither signal to data about to be applied to the quantizer (16). This suppresses attenuation of the dither signal due to noise shaping. Therefore, the dither signal can be supplied effectively. The idle pattern appearing in the output signal can be suppressed. Since the pattern of the dither signal is varied at a frequency that is {fraction (1/16)} to ⅛ of the frequency of the operating clock signal, the frequency of noise component due to the dither signal lowers. The signal and the dither signal component can be easily separated in a rear stage.
    • 一个极移噪声整形器,其传输函数具有一个Z平面,其中极点已经移出原点。 噪音整形器抑制空闲模式。 噪声整形器具有放置在量化器(16)之前的抖动加法器(17),以将抖动信号添加到要被施加到量化器(16)的数据。 这抑制了由于噪声整形引起的抖动信号的衰减。 因此,可以有效地提供抖动信号。 可以抑制出现在输出信号中的空闲模式。 由于抖动信号的模式以操作时钟信号的频率的1/16至1/8的频率变化,所以由抖动信号引起的噪声分量的频率降低。 信号和抖动信号分量可以容易地在后级分离。
    • 8. 发明授权
    • Constant width pulse distribution in a digital to analog converter for
serial digital data
    • 用于串行数字数据的数模转换器中的恒定宽度脉冲分布
    • US4929947A
    • 1990-05-29
    • US176921
    • 1988-04-04
    • Akira Toyama
    • Akira Toyama
    • G11B20/10H03M1/68H03M3/02
    • H03M3/372H03M3/50
    • A digital-to-analog converter comprising: a distributing circuit (2, 3, 4, 5; 2, 13, 14-26) for distributing data pulses, which are bit-serially supplied at constant time intervals, into a plurality of routesand for providing them as pulses having a constant width; and a converting circuit (12) for adding together the pulses from the distributing circuit and thereby for converting them to an analog output. Such a circuit arrangement can provide pulses for conversion to analog form which all have an identical waveform and an identical area, and errors caused by the difference between the rise and fall times of the pulses can be eliminated and therefore D/A conversion characteristics can be improved.
    • 一种数模转换器,包括:分配电路(2,3,4,5,2,13,14-26),用于分配以恒定时间间隔逐位提供的数据脉冲到多个路由 并将它们提供为具有恒定宽度的脉冲; 以及用于将来自分配电路的脉冲相加在一起并由此将其转换成模拟输出的转换电路(12)。 这样的电路装置可以提供用于转换成模拟形式的脉冲,其全部具有相同的波形和相同的面积,并且可以消除由脉冲的上升和下降时间之间的差引起的误差,因此D / A转换特性可以是 改进。