专利汇可以提供Automatic noise reduction system专利检索,专利查询,专利分析的服务。并且An automatic noise reduction system has a signal amplifier, a resistor as a first impedance circuit and a second impedance circuit which comprises resistors, capacitor and a variable resistance element. The frequency response of the second impedance circuit changes according to the resistance value of the variable resistance element and that resistance value is changed by a control circuit. In recording, the resistor constituting the first impedance circuit is connected to the input side of the signal amplifier and the second impedance circuit is connected to the negative feedback loop of the signal amplifier, and the control means provides a D.C. voltage in response to the input signal, so that the signal to be recorded is emphasized. In reproducing, the connection is reversed and the control means provides a D.C. voltage in response to the output signal, so that the reproduced signal is modified with characteristics complementary to the emphasized characteristics and provided with the same wave form as that of the original signal with reduced record medium noises.,下面是Automatic noise reduction system专利的具体信息内容。
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