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公开(公告)号：US3882398A
公开(公告)日：1975-05-06
申请号：US32647773
申请日：1973-01-24
发明人： OGITA MINORU , MATSUI TERUYOSHI
CPC分类号： H03J3/14
摘要： A reference frequency signal is prepared by a fixed frequency oscillator or by multiplying the IF frequency. A receiving frequency representing signal is obtained as an output of the RF amplifier or that of the local oscillator. The two signals are mixed to produce a beat frequency signal, which is converted by a frequency detector into a d.c. voltage or current, which in turn is applied to a meter. The meter carries a scale marked in frequencies, the pointer indicating the receiving frequency.
摘要翻译： 参考频率信号由固定频率振荡器或通过乘以IF频率来准备。 获得接收频率表示信号作为RF放大器或本地振荡器的输出。 混合这两个信号以产生拍频信号，该频率信号由频率检测器转换成直流。 电压或电流，其又被施加到电表。
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公开(公告)号：US3683293A
公开(公告)日：1972-08-08
申请号：US3683293D
申请日：1970-06-15
发明人： MATSUI TERUYOSHI
CPC分类号： H03G5/10
摘要： A tone control circuit used in a stereo amplifier, guitar amplifier, or the like, comprising an amplifier having a first terminal and a second terminal for delivering outputs in an opposite phase relation, a plurality of circuit branches connected across the first and the second terminals for controlling tone level in the corresponding frequency ranges, and variable elements included in said plurality of circuit branches and each having a movable contact terminal connected to the ground, so that the ratio between the load impedances connected to the first and the second output terminals of the amplifier can be varied by varying the position of the movable contact terminal on either one of the variable elements, whereby the gain of the amplifier can be controlled by varying the impedance ratio in a desired frequency range.
摘要翻译： 在立体声放大器，吉他放大器等中使用的音调控制电路，包括具有第一端子和第二端子的放大器，用于以相反的相位关系输出输出;跨越第一和第二端子连接的多个电路支路 用于控制相应频率范围内的音调电平，以及包括在所述多个电路分支中的可变元件，并且每个具有连接到地的可动触点端子，使得连接到第一和第二输出端子的负载阻抗之间的比率 可以通过改变可变接触端子在可变元件中的任一个上的位置来改变放大器，从而可以通过改变期望频率范围内的阻抗比来控制放大器的增益。
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