| Title: | * * Computer Music, MIDI, and Related Topics * * |
| Notice: | Conference has been write-locked. Use new version. |
| Moderator: | DYPSS1::SCHAFER |
| Created: | Thu Feb 20 1986 |
| Last Modified: | Mon Aug 29 1994 |
| Last Successful Update: | Fri Jun 06 1997 |
| Number of topics: | 2852 |
| Total number of notes: | 33157 |
I'll give this one away: Imagine a noise reduction signal processor
that looks just like a "Graphic" equalizer. Instead of each frequency
band's control being a "level", it is a "threshold", say, from 10mV
to 10 volts. Two LEDs for each band, red and green, let you know
if the signal in that band is below the threshold setting or above...
When a particular frequency band's signal is below the threshold
setting, that band is disconnected from the output. When the green
LED is illuminated...you guessed it! That band is "on line".
With a proper choice of thresholds (external) and the dynamic
response of the squelching circuitry (internal), this could be a
killer noise gate! Why record all that "sssssss" when the bassist
is doing a tasty, unaccompanied solo?
Next week's idea: Graphic compressor - or - DBX "N"bx.
Joe Jas
| T.R | Title | User | Personal Name | Date | Lines |
|---|---|---|---|---|---|
| 961.1 | AQUA::ROST | Fast and bulbous, tight also | Fri Sep 25 1987 19:59 | 4 | |
This sort of thing is what most single-ended noise reduction systems
like Burwen, Rocktron, DNR, etc. etc. do, except they cannot take
out a mid band noise if higher frequency information is present.
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| 961.2 | MPGS::DEHAHN | Mon Sep 28 1987 13:39 | 7 | ||
It's called a de-esser. Compression restricted to a frequency band.
Used mostly to take sibilants out of vocalists, but could be used
for any frequency-specific overload problem.
CdH
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| 961.3 | Noone's built this one! | FLOWER::JASNIEWSKI | Mon Sep 28 1987 14:11 | 7 | |
Hmmmm, how bout a graphic digital delay? Delay the spectral
components of a sound by different times. Should "fatten" things
up a bit (ar-ar).
Joe Jas
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| 961.4 | BARNUM::RHODES | Tue Sep 29 1987 12:53 | 5 | ||
Any n-pole filter does this. The good old phase shift as a function of frequency... Todd. | |||||
| 961.5 | At Least My 501 Does | DRUMS::FEHSKENS | Wed Sep 30 1987 11:38 | 5 | |
Most compressors have a "side chain" input/output that allows you
to EQ the control signal to do freqency dependent processing.
len.
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