Pole is specifically designed and applied in terms of audio. Analog filters are designed to integrate capacitors and inductors based on interactions with changing frequencies. For example, a capacitor can be made into a low-pass or high-pass filter in a circuit with a resistor. This is called a RC circuit (resistance and capacitor), a single RC circuit (a capacitor, a resistor). It is a unipolar filter, and so on. There are two RC circuits and so on. A single-pole filter can replicate (plus some phase transitions) a high pass or low pass around 6 octaves per octave. For example, if the frequency is reduced by one octave in a high-pass filter, the signal voltage is reduced by half by 6 dB according to the formula 20log (V1/V2), and the two-pole filter is reduced by 12 dB. In a bandpass filter, the more poles, the higher the Q value. For resonance filters that often appear in synthesizers, more poles mean higher levels of resonance. Nowadays, digital circuits and software can simulate extreme functions through specific algorithms, and software can reduce the amplitude of the frequency by a method completely different from the traditional filter, enabling users to implement certain aspects of complex signals. More control, resulting in many unique audio features.
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