Jack1988
Newbie level 4
I'm enjoying playing with sound file by giving effects to the original.
Nowadays I'm interested in filtering certain bandwidth from hearable sound range between 20Hz and 22kHz. Normal adults can recognize upto 16kHz only.
In frequency spectrum editor, for example I extract 14.5kHz ~ 15.5kHz across 2 hours of sound records just by selecting long horizontal square area across the entire sound spectrum view with mouse dragging on the screen. Then crop and play. That's all. This eleminates most voices and musical instruments (20Hz ~ 8kHz ; Yes, MP3 encoding with normal compression gives only this range of sound from the original) and gives me any sound signal caught between 14.5kHz ~ 15.5kHz which would be small fraction of sharp noises out of musical instruments.
Very easy to do in software method.
But no idea how to begin in hardware RLC circuit. Collect sound with the mic and filter with simple(?) RLC circuit, and convey the filtered to the recorder or headphone, or even to the MPU input node. How?
Any advise will be appreciated.
Nowadays I'm interested in filtering certain bandwidth from hearable sound range between 20Hz and 22kHz. Normal adults can recognize upto 16kHz only.
In frequency spectrum editor, for example I extract 14.5kHz ~ 15.5kHz across 2 hours of sound records just by selecting long horizontal square area across the entire sound spectrum view with mouse dragging on the screen. Then crop and play. That's all. This eleminates most voices and musical instruments (20Hz ~ 8kHz ; Yes, MP3 encoding with normal compression gives only this range of sound from the original) and gives me any sound signal caught between 14.5kHz ~ 15.5kHz which would be small fraction of sharp noises out of musical instruments.
Very easy to do in software method.
But no idea how to begin in hardware RLC circuit. Collect sound with the mic and filter with simple(?) RLC circuit, and convey the filtered to the recorder or headphone, or even to the MPU input node. How?
Any advise will be appreciated.
