MrDEB
Well-Known Member
Am running all sorts of filter configurations for a DIY hearing aid.
My audiologist says 250hz to 4.3khz with 60-70 db loss.
well in running simulations in TINA I can kinda figure out the bandwidth and center frequency but why is the db measurment say -40 etc. ALL minus signs?
Here is a screen shot of a speech filter combined with a sallen filter. Looking at the screen I think it tells me the green trace (both combined with summing amp) that I have a 140 - 4khz bandwidth or ??
My audiologist says 250hz to 4.3khz with 60-70 db loss.
well in running simulations in TINA I can kinda figure out the bandwidth and center frequency but why is the db measurment say -40 etc. ALL minus signs?
Here is a screen shot of a speech filter combined with a sallen filter. Looking at the screen I think it tells me the green trace (both combined with summing amp) that I have a 140 - 4khz bandwidth or ??