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#1
Posted to rec.audio.pro
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"dbx knows compressors...after all we invented them!"
Just found this profound statement on a data sheet for a dbx 166xs
compressor. I don't know offhand who should get credit for 'inventing the compressor', but they existed way before the dbx company was even founded, right? -Neb |
#2
Posted to rec.audio.pro
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"dbx knows compressors...after all we invented them!"
nebulax wrote:
Just found this profound statement on a data sheet for a dbx 166xs compressor. I don't know offhand who should get credit for 'inventing the compressor', but they existed way before the dbx company was even founded, right? I believe A.D. Blumlein was using an experimantal system of automatic volume control on wax recorders in the late 1920s. The BBC were certainly using very effective compressors/limiters on their transmitters and recording lathes in the 1940s. How old is the dbx company? -- ~ Adrian Tuddenham ~ (Remove the ".invalid"s and add ".co.uk" to reply) www.poppyrecords.co.uk |
#3
Posted to rec.audio.pro
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"dbx knows compressors...after all we invented them!"
Adrian Tuddenham wrote:
nebulax wrote: Just found this profound statement on a data sheet for a dbx 166xs compressor. I don't know offhand who should get credit for 'inventing the compressor', but they existed way before the dbx company was even founded, right? I believe A.D. Blumlein was using an experimantal system of automatic volume control on wax recorders in the late 1920s. The BBC were certainly using very effective compressors/limiters on their transmitters and recording lathes in the 1940s. How old is the dbx company? ....was founded in 1971. http://en.wikipedia.org/wiki/Dbx,_Inc. -Pentti |
#4
Posted to rec.audio.pro
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"dbx knows compressors...after all we invented them!"
nebulax wrote:
Just found this profound statement on a data sheet for a dbx 166xs compressor. I don't know offhand who should get credit for 'inventing the compressor', but they existed way before the dbx company was even founded, right? Yeah, BUT David Blackmer at dbx did come up with the standard VCA design that everyone today uses. It was an absolute and total revolution in compressor design. --scott -- "C'est un Nagra. C'est suisse, et tres, tres precis." |
#5
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"dbx knows compressors...after all we invented them!"
"Scott Dorsey" wrote in message ... nebulax wrote: Just found this profound statement on a data sheet for a dbx 166xs compressor. I don't know offhand who should get credit for 'inventing the compressor', but they existed way before the dbx company was even founded, right? Yeah, BUT David Blackmer at dbx did come up with the standard VCA design that everyone today uses. It was an absolute and total revolution in compressor design. Well not "everyone" since many people think anything "retro" must be better. Trevor. |
#6
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"dbx knows compressors...after all we invented them!"
On Jan 17, 4:18*pm, (Scott Dorsey) wrote:
nebulax wrote: Just found this profound statement on a data sheet for a dbx 166xs compressor. I don't know offhand who should get credit for 'inventing the compressor', but they existed way before the dbx company was even founded, right? Yeah, BUT David Blackmer at dbx did come up with the standard VCA design that everyone today uses. *It was an absolute and total revolution in compressor design. --scott Well then, I guess it would be more accurate to say "dbx knows VCA compressors...", tho' that would be somewhat less impressive sounding. Now if they said "We also traveled back into history with our magical time machine, and came up with the original designs for the Fairchild 660 limiter", then I'd be impressed! -Neb -Neb |
#7
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"dbx knows compressors...after all we invented them!"
"nebulax" wrote in message ... On Jan 17, 4:18 pm, (Scott Dorsey) wrote: nebulax wrote: Just found this profound statement on a data sheet for a dbx 166xs compressor. I don't know offhand who should get credit for 'inventing the compressor', but they existed way before the dbx company was even founded, right? Yeah, BUT David Blackmer at dbx did come up with the standard VCA design that everyone today uses. It was an absolute and total revolution in compressor design. --scott Well then, I guess it would be more accurate to say "dbx knows VCA compressors...", tho' that would be somewhat less impressive sounding. Now if they said "We also traveled back into history with our magical time machine, and came up with the original designs for the Fairchild 660 limiter", then I'd be impressed! -Neb -Neb The folks at CBS Labs who developed the Audimax will be surprised to hear this. |
#8
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"dbx knows compressors...after all we invented them!"
MG wrote:
"nebulax" wrote in message Scott wrote: Yeah, BUT David Blackmer at dbx did come up with the standard VCA design that everyone today uses. It was an absolute and total revolution in compressor design. Well then, I guess it would be more accurate to say "dbx knows VCA compressors...", tho' that would be somewhat less impressive sounding. Now if they said "We also traveled back into history with our magical time machine, and came up with the original designs for the Fairchild 660 limiter", then I'd be impressed! The folks at CBS Labs who developed the Audimax will be surprised to hear this. I don't recall the original tube Audimax, but the solid state 400-series used a bipolar transistor with the bias point changed by a control voltage. Linearity was orders of magnitude poorer than you could get with the Blackmer VCA. The Blackmer circuit could get you distortion levels that were impossible to obtain without an optical LCR, but with a response time hundreds of times faster than the Lumiten or Vactrol. On top of that, it gave you much wider usable gain range. It really was a total revolution, it's really what made VCA automation and companding for noise reduction possible. Mind you, the control circuit on the Audimax which locked the gain on silent passages was a revolution in itself, and the same design is showing up in a lot of dsp broadcast compressors today.... --scott -- "C'est un Nagra. C'est suisse, et tres, tres precis." |
#9
Posted to rec.audio.pro
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"dbx knows compressors...after all we invented them!"
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#10
Posted to rec.audio.pro
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"dbx knows compressors...after all we invented them!"
Properly linearized FET compressors can be very clean too. IIRC, the harmonic distortion caused by the FET attenuator in an Optimod 8000 was in the order of 0.025%, which was achieved by limiting the audio level across the FET to about 20 mv. It was followed by a low-noise amplifier. . Bob Orban Bob, also besides keeping the audio level on the drain low, as I'm sure you already know, the trick of feeding 1/2 of the audio into the gate, greatly reduces the distortion as well.. http://www.eecg.toronto.edu/~kphang/...martin_AGC.pdf Mark |
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