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    • 4. 发明授权
    • High frequency video isolation system
    • 高频视频隔离系统
    • US6031583A
    • 2000-02-29
    • US93997
    • 1998-06-09
    • Sreeram DhurjatyMartin E. Trzcinski
    • Sreeram DhurjatyMartin E. Trzcinski
    • H04N5/40
    • H04N5/40
    • A high frequency video isolation circuit comprising: a modulating signal source for producing a modulating signal having a frequency of several hundred megahertz; an input multiplier for multiplying the modulating signal with an input video signal having frequency components in a frequency range from about several hertz to about one hundred or more megahertz, to produce a modulated video signal having frequency components in a frequency range from about one hundred megahertz to about several hundred megahertz; a first isolation transformer having an input and an output, for transforming the modulated video signal from the input to the output; and an output multiplier for multiplying the transformed modulated video signal with the modulating signal to produce an isolated output video signal having the frequency components of the input video signal.
    • 一种高频视频隔离电路,包括:调制信号源,用于产生频率为数百兆赫兹的调制信号; 输入乘法器,用于将调制信号与具有从约几赫兹到约百或更多兆赫兹的频率范围内的频率分量的输入视频信号相乘,以产生具有在大约百兆赫兹的频率范围内的频率分量的调制视频信号 到几百兆赫兹 具有输入和输出的第一隔离变压器,用于将调制视频信号从输入转换成输出; 以及输出乘法器,用于将变换的调制视频信号与调制信号相乘以产生具有输入视频信号的频率分量的隔离输出视频信号。
    • 5. 发明授权
    • Sync stripper circuit
    • 同步剥离电路
    • US5485220A
    • 1996-01-16
    • US979999
    • 1992-11-23
    • Peter J. McNeillyMartin E. Trzcinski
    • Peter J. McNeillyMartin E. Trzcinski
    • H04N1/04H04N5/08H04N5/10H04N5/12H04N7/18
    • H04N5/08H04N5/10H04N5/126
    • A sync stripper circuit receives from a medical imaging modality a composite video signal with a horizontal sync frequency within one of first, second, third or fourth frequency ranges. The sync stripper circuit includes a circuit for stripping the composite sync signal from the received signal; horizontal sync detection circuit for detecting the horizontal sync signal from the stripped composite sync signal; a vertical sync detection circuit for detecting the vertical sync signal; an F1/F2 field detection circuit for detecting the F1/F2 field from the stripped composite sync signal; and a control circuit for controlling the horizontal sync detection circuit, the vertical sync detection circuit and the F1/F2 field detection circuit to operate in the selected one of said first, second, third or fourth frequency ranges of the received composite video signal. A serrating signal circuit inserts a horizontal signal into the vertical sync signal if serrating signals are absent therein.
    • 同步剥离器电路从医学成像模式接收具有在第一,第二,第三或第四或第四频率范围之一内的水平同步频率的复合视频信号。 同步剥离器电路包括用于从接收信号中去除复合同步信号的电路; 水平同步检测电路,用于从剥离的复合同步信号中检测水平同步信号; 用于检测垂直同步信号的垂直同步检测电路; 用于从剥离的复合同步信号中检测F1 / F2场的F1 / F2场检测电路; 以及控制电路,用于控制水平同步检测电路,垂直同步检测电路和F1 / F2场检测电路,以操作所接收的复合视频信号的所述第一,第二,第三或第四频率范围中选定的一个。 如果锯齿信号不存在,则锯齿信号电路将水平信号插入垂直同步信号。