![]() The filter output is simply accessed across the resistor instead of the capacitor. Note that because the same resistor and capacitor were used, the cutoff frequency has not changed. Below is a Bode plot of the high-pass RC filter frequency response a few sections back.The cutoff frequency, which is 1592 Hz for this particular circuit, corresponds to a 3 dB attenuation, and can be used as a figure-of-merit for the response of the filter. This provides a valuable reference tool for the audio engineer, technical engineer, and the audio equipment designer. Another 10-fold increase, and another 10dB increase, would feel like another doubling. A 10-fold increase in sound intensity, measured as a 10dB increase with a sound meter, would feel to us roughly like a doubling in loudness. The decibel can be used to measure sound pressure level, sound intensity level, voltage level and power, just to name a few. The decibel scale is logarithmic because thats essentially how our ears respond. This is the cutoff frequency, f 0, of the RC filter, which is expressed by the following relationship: f 0 = 1/(2πRC) The decibel scale can be used to measure audio in a variety of different ways. The intersection point of these two lines coincides with the rounded section of the plot. Every Bode plot has two straight lines: the relatively flat response where little attenuation occurs and a linear response of -20 dB/decade at higher frequencies.Notice that low frequencies are unattenuated, but attenuation increases with higher frequencies. Below is a Bode plot of the low-pass RC filter frequency response shown a few sections back.Expressing Signal Attenuation of RC filters.
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