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    • 1. 发明公开
    • Versatile signal generator
    • Vielseitiger信号发生器
    • EP0935339A1
    • 1999-08-11
    • EP99300672.5
    • 1999-01-29
    • Hewlett-Packard Company
    • Hilton, Howard E.Guilford, John H.
    • H03C5/00H04L27/00H04L1/24
    • H04L1/244H04L27/0008
    • A versatile signal generator (100) for generating digitally modulated test signals computed in real-time is provided. Each of the blocks of the versatile signal generator, including the MUX (200), coder (202), map (204), filter (204), re-sampler (104), and complex modulator (110), are implemented in a sufficiently flexible manner so as to allow ready configuration to produce any of a variety of digitally modulated signals as well as high quality analog modulated signals. Each of the blocks may be implemented using ASICs and RAM that to obtain high symbol rates while being capable of being reconfigured for different test signals as needed. The versatile signal generator has a real time input (106) for receiving input data to modulate the test signal in real time.
    • 提供一种用于生成实时计算的数字调制测试信号的通用信号发生器(100)。 包括MUX(200),编码器(202),映射(204),滤波器(204),重新采样器(104)和复数调制器(110)的通用信号发生器的每个块被实现在 足够灵活的方式,以便允许准备配置产生各种数字调制信号以及高质量模拟调制信号中的任何一种。 可以使用ASIC和RAM来实现每个块,以获得高符号率,同时能够根据需要为不同的测试信号重新配置。 通用信号发生器具有用于接收输入数据以实时调制测试信号的实时输入(106)。
    • 3. 发明公开
    • Clock recovery phase detector
    • PhasendetektorfüreinTaktrückgewinnungssystem。
    • EP0578489A1
    • 1994-01-12
    • EP93305329.0
    • 1993-07-07
    • Hewlett-Packard Company
    • Guilford, John H.Hilton, Howard E.
    • H04L7/033
    • H04L7/0334
    • A phase detector (10) for symbol clock recovery in a digital communications system determines the phase error of a local symbol clock (94) from the symbol rate of a transmitted signal by sampling the transmitted signal to obtain a first sample at a fraction of a symbol period after the symbol clock and to obtain a second sample at an equal fraction of a symbol period before the symbol clock, and determining a phase error equal to the difference between a function of the magnitude of the first sample and a function of the magnitude of the second sample. The function is preferably the square of the magnitude or the logarithm of the magnitude of the samples.
    • 用于数字通信系统中的符号时钟恢复的相位检测器(10)通过对所发送的信号进行采样来确定本发明信号的符号率的本地符号时钟(94)的相位误差,以获得第一采样 符号时钟之后的符号周期,并且以符号时钟之前的符号周期的相等部分获得第二采样,并且确定等于第一样本的幅度的函数与幅度函数之间的差的相位误差 的第二个样本。 该函数优选地是样本幅度的幅度或对数的平方。