AltAudio
New Member
Hello,
I built a low pass filter from specs in https://www.electro-tech-online.com/threads/low-pass-audio-filter.13192/ and it worked wonderfully. Now I'd like to build a hi-pass audio filter to pass anything above 18KHz. I realize that humans(most) cannot hear this level, but I am putting 20KHz hashmarks in a recording that I specifically do not want heard. I then need to filter these markings.
Also, could you recommend some good books/readings that would enable me to start calculating first/second order differentials such that I can build band pass filters and understand the 'hows' and 'whys', rather than grabbing a bunch of inductors/caps and seeing what works and what doesn't. There is a .jpg image in above referenced hyperlink that shows components and cutoff frequency. Are those images from MatLab?
Many Thanks...Mick
I built a low pass filter from specs in https://www.electro-tech-online.com/threads/low-pass-audio-filter.13192/ and it worked wonderfully. Now I'd like to build a hi-pass audio filter to pass anything above 18KHz. I realize that humans(most) cannot hear this level, but I am putting 20KHz hashmarks in a recording that I specifically do not want heard. I then need to filter these markings.
Also, could you recommend some good books/readings that would enable me to start calculating first/second order differentials such that I can build band pass filters and understand the 'hows' and 'whys', rather than grabbing a bunch of inductors/caps and seeing what works and what doesn't. There is a .jpg image in above referenced hyperlink that shows components and cutoff frequency. Are those images from MatLab?
Many Thanks...Mick
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