Filter
Filter introduction
lowpass: lowpass filter, simple processing of low frequency effects, allowing a certain part of the low frequency to pass through. No gain effect. highpass: Highpass filter, simple combing high-frequency effects, allowing a certain part of the high-frequency parts to pass through without gain effect. allpass: Full pass filtering, stabilizes the system response, and is a turbid sound. bandpass: Allows to pass within a certain frequency. bandstop: Make a certain frequency suppressed. low shelf: cut off the frequency below the center frequency: adjustable gain. high shelf: cut off the frequency above the center frequency: adjustable gain. peak filter: spike filtering, pulling up the center frequency gain and frequency response. notch fliter: suppresses the gain and frequency response of the center frequency.
Filter Application
1、EQ
2、PEQ(参量 EQ)
3. Digital frequency division
Digital frequency division is to separate the high frequency and low frequency of a signal using digital signal processing technology and send it to two different channels respectively, so that a frequency division function can be realized. From a signal perspective, to realize the function of digital frequency division, a high-pass filter and a low-pass filter are required, which only retain high-frequency signals and low-frequency signals respectively. At this time, the advantages of digital signal processing are reflected. Compared with the problems of cheapness or mass production consistency of analog filters at the frequency division point, there is no such problem in digital signals.