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    • 1. 发明申请
    • FREQUENCY AGILE MODULATOR
    • 频率调制器
    • WO1997023034A1
    • 1997-06-26
    • PCT/US1996019989
    • 1996-12-16
    • THE WHITAKER CORPORATIONPRESCHUTTI, Joseph, P.FLICKINGER, Steven, LeeFETTEROLF, James, RayNONNEMACHER, Elwood, D.
    • THE WHITAKER CORPORATION
    • H03D07/16
    • H03J1/005H03D7/161H04N7/106
    • A frequency agile modulator which modulates input baseband video and audio signals to a selected NTSC channel. The modulator includes a microprocessor which has as inputs a channel up push-button switch and a channel down push-button switch. An amplifier stage of the modulator is turned off by the microprocessor when the channel is being changed. A low pass noise limiting filter and a high pass noise limiting filter are connected in parallel between the amplifier stage output and the output of the modulator and, depending upon the selected channel, either one or the other of the filters is inserted in the signal path by the microprocessor. Equalizer circuitry is provided at the output of the modulator so that lower frequency signals are transmitted at a lower level than higher frequency signals.
    • 频率敏捷调制器,其将输入基带视频和音频信号调制到所选择的NTSC信道。 调制器包括具有通道上推按钮开关和通道向下按钮开关作为输入的微处理器。 当通道改变时,微处理器关闭调制器的放大器级。 低通噪声限制滤波器和高通噪声限制滤波器并联连接在放大器级输出端和调制器的输出端之间,并根据所选择的通道,将一个或另一个滤波器插入信号路径 由微处理器。 在调制器的输出处提供均衡器电路,使得较低频率信号以比较高频率信号更低的电平传输。