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Language filter circuit

2017-02-24 14:28  
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Language filter circuit
The circuit can be used to limit the language frequency band, which can remove interference and noise except the clatter. This function can be achieved by two multiple negative feedback with two second-order active filters. Two filters are set in a cascaded manner, whose pre-end is the high-pass filter and pro-end is the low-pass filter. The overall characteristics appear to be that of the band-pass filter. High-pass filter’s cutoff frequency is 300Hz, which can constitute the lower end of band-pass filter; and low-pass filter’s cutoff frequency is 3000Hz, which can constitute a higher end of band-pass filter. The rolling band’s attenuation is 40 dB per 10 octave and the circuit’s gain is 1.