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Everyone is familiar with the so called "inverse RIAA filter" used as a testing tool to check the accuracy of the filter in your phono preamp.
These can be bought from Hagerman and others.
In the article linked below the writer says "It is well known that vinyl music reproduction needs equalization. During the cutting process low frequencies need to be attenuated and high frequencies need to be boosted."
He goes on to say "During playback the exact inverse filter characteristic must be applied to receive a flat frequency response"
And then says "Every phono stage therefore needs an RIAA filter somewhere in the amplification chain."
Here's the problem I see. It is just a matter of semantics but it bothers me.
The filter used when cutting a record IS a RIAA filter. The filter in your phono preamp is an inverse RIAA filter with "exact inverse filter characteristic" (to quote the article).
The filters sold to check the accuracy of the filter in your phono preamp is a ***RIAA filter***, not a **inverse** RIAA filter.
End of rant.
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
Follow Ups:
"He goes on to say 'During playback the exact inverse filter characteristic must be applied to receive a flat frequency response'"
The quoted remark is inaccurate. Not only must the mastering time HF boost/LF cut be undone, but a correction applied for the velocity response of magnetic pickups. Truly "flat" behavior requires an amplitude response.
Eli D.
I guess it is the very nature of what we do here that gives us this strange (at times) attention to detail.
Agreed. To me it's just proper use of language. If the filter used to make the record is a RIAA filter then the filter meant to undo the RIAA filter is a inverse RIAA filter.
How about "recording RIAA filter" and "Playback
Riaa filter"? I wouldn't have a problem with that.
And that would make the test filter a "inverse playback
RIAA filter" I can live with that!
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
I agree Tre'. Wrong grammar is one thing (which I'm guilty of) but proofreading should be used by someone else privy to what's being talked about.
Or maybe a salesman wrote it or did the proofreading for him. People are glossing over many things these days. Sockawawaginza gabba yea yea
In the cutting process, the RIAA curve is referred to variously as the 'pre-emphasis curve', 'emphasis' or 'RIAA characteristic'.
In playback its also often called the 'de-emphsis' curve, or again, 'RIAA characteristic'.
Its just humans.
"Its just humans. "
Yeah, I know.
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
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