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CIRCUIT ARRANGEMENT FOR AUTOMATICALLY ADJUSTING THE VOLUME AT LEAST ONE SPEAKER TO A NOISE LEVEL FOR RADIO RECEIVERS IN THE SPEAKER LOCATION.
CIRCUIT ARRANGEMENT FOR AUTOMATICALLY ADJUSTING THE VOLUME AT LEAST ONE SPEAKER TO A NOISE LEVEL FOR RADIO RECEIVERS IN THE SPEAKER LOCATION.
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机译:电路布置,可自动将至少一个扬声器的音量调整为扬声器位置中无线电接收器的噪声水平。
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摘要
In a circuit which matches the speaker input signal in a car radio to the then-present noise level, an additional RC circuit is interconnected between the speaker input terminal and the input of the volume control element. Sudden increases in the speaker input voltage following a modulation pause which cause a high increase in the gain of the volume control circuit will counteract this gain, thereby preventing the excessive increase in speaker sound output following such a modulation pause which took place in the known circuits. Zener diodes to limit the voltage at the volume control elements in dependence upon the battery output voltage and to a value such that the output stage driving the speaker will not be overdriven are also provided.
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