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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク High-pass filter ： ウィキペディア英語版 High-pass filter A high-pass filter is an electronic filter that passes signals with a frequency higher than a certain cutoff frequency and attenuates signals with frequencies lower than the cutoff frequency. The amount of attenuation for each frequency depends on the filter design. A high-pass filter is usually modeled as a linear time-invariant system. It is sometimes called a low-cut filter or bass-cut filter. High-pass filters have many uses, such as blocking DC from circuitry sensitive to non-zero average voltages or radio frequency devices. They can also be used in conjunction with a low-pass filter to produce a bandpass filter. ==First-order continuous-time implementation== The simple first-order electronic high-pass filter shown in Figure 1 is implemented by placing an input voltage across the series combination of a capacitor and a resistor and using the voltage across the resistor as an output. The product of the resistance and capacitance (''R''×''C'') is the time constant (τ); it is inversely proportional to the cutoff frequency ''f''''c'', that is, :$f\_c\; =\; \backslash frac\; =\; \backslash frac,\backslash ,$ where ''f''''c'' is in hertz, ''τ'' is in seconds, ''R'' is in ohms, and ''C'' is in farads. Figure 2 shows an active electronic implementation of a first-order high-pass filter using an operational amplifier. In this case, the filter has a passband gain of -''R''2/''R''1 and has a cutoff frequency of :$f\_c\; =\; \backslash frac\; =\; \backslash frac,\backslash ,$ Because this filter is active, it may have non-unity passband gain. That is, high-frequency signals are inverted and amplified by ''R''2/''R''1. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「High-pass filter」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.