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Author Topic:   New Pair of Ears...
David McClain
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posted 17 December 2000 02:50         Edit/Delete Message   Reply w/Quote

stereogreqinch3+4.kym

 
Here is a simple patch for independent channel (left + right) equalization using inputs/outputs 3+4 on the Capy. It is intended for folks like me who need to adjust the incoming signal to a pair of hearing aids. Hearing aids tend to be optimized for speech processing and frequently overcorrect the higher harmonics of musical instrument sounds. Piano notes sound buzzy because the higher harmonics are brighter than they should be. This subtractive equalizer compensates by removing these slight overcorrections. It is better to do this in conjunction with hearing aids, rather than to try to do your own correction for your native sensors. Hearing aids give as much as 60-70 dB boost to selected frequency bands (the same ones used by this equalizer), but they do it with up to 23 bits of analog to digital conversion, and that is a lot more than a 16-bit system could stand. Subtractive equalization ahead of the hearing aids uses a more gentle process (typically under 20 dB) of signal modification, and allows the hearing aids to do their thing.

To use this patch, send your mix to an unused Aux channel on your mixer board and route its external Aux Send to channels 3 and 4 of the Capy. Take channels 3 and 4 out of the capy and return to an unused mixer channel. Monitor that channel, but keep it from entering into the master mix. That way you can hear what you should without introducing undesirable EQ for other listeners.

I can’t be the only Kyma/Capy user out there that is gradually going deaf, but maybe I’m one of the few lacking vanity enough to admit it. There is too much to life remaining to experience, and Kyma plays a large part of that for me. With a new pair of hearing aids (my first ones) I can now hear my own footsteps, I hear the on/off switch on the Capy, and I even hear its fan. I can also have a discussion with my wife and enjoy group gatherings without tuning out. If you decide that it is time to do something about your own hearing I highly recommend the Siemens SIGNIA line of 8-channel DSP based hearing aids. These offer 8 bands of frequency amplitude adjustment, divided into 4 independent frequency bands for dynamic compression, as well as noise suppression. And they don’t squeal with headphones on; they have feedback suppression, and a host of special speech processing options. Each one of these is like hanging a little Capy over your ear! (I actually tried to build my own with Kyma, and it takes more than 3-4 DSP's per channel.)

- DM

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David McClain
Member
posted 19 December 2000 03:46         Edit/Delete Message   Reply w/Quote

stereohearingcomp.kym

 
Here's another approach...

For those not wishing to wear their hearing aids while listening with headphones, this patch allows Kyma to perform frequency selective dynamic range compression to give corrected hearing of musical material. This is actually desirable, I find, since hearing aids are optimized for speech and contain noise cancelling algorithms -- read that as carving away any constant background, including music.

This patch merely provides dynamic range compression in 6 frequency bands from 250- Hz to 8+ KHz. No noise cancellation.

Play with the thresholds and compression ratios in each band to suit your tastes. The input comes from channels 3+4 and the output goes back out on 3+4.

- DM

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