Hello all. I'm experiencing a little trouble with a project I am working on. The objective is to process a provided audio signal (.wav file), first to remove a high frequency (1khz) noise present, secondly to remove background interference (of which a pure sample is provided in a second .wav file), thirdly to provide a means of variable amplifying the output signal, and finally to provide a means of sampling the output signal for track reconstruction. This is all to be modeled in MultiSim.
I have decided to use a simple low-pass RC filter to remove the high frequency noise (step 1), and have been looking into using a common gate MOSFET amplifier for step 3 (the variable amplification). The second and fourth part, point by point signal comparison and removal of the secondary interference followed by the sampling have me a bit stumped.
Any advice, help, ideas, or suggestions would be appreciated both on what I've done and what I should do. Thank you for your time .
P.S. Details from the project:
I have decided to use a simple low-pass RC filter to remove the high frequency noise (step 1), and have been looking into using a common gate MOSFET amplifier for step 3 (the variable amplification). The second and fourth part, point by point signal comparison and removal of the secondary interference followed by the sampling have me a bit stumped.
Any advice, help, ideas, or suggestions would be appreciated both on what I've done and what I should do. Thank you for your time .
P.S. Details from the project:
said:Your circuit schematic must operate correctly and contain the following elements:
-A method of removing the high-frequency noise from the recording
-A method of removing the undesired dolphin chatter from the recording
-A method of amplifying the signal by a variable gain
-A FET based method of buffering the signal current while following the current (current gain = 1); this device should have a low input impedenance and a high output impedance
-A method of sampling the output signal at a particular frequency for track reproduction
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