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Date: Thu, 31 Oct 96 19:57:34 -0800
From: "Victor J. Albert" <victora@mda.vnd.tek.com>
Organization: Tektronix
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caraudio@ix.netcom.com(Car Audio And Electronics magazine ) wrote:
>My Opinions on this thread:
>
>1. RTA *is* a *very* useful tool in car audio.
>
>2. Current IASCA/USAC scoring procedures for RTA *suck*, should be
>changed (IASCA's will for 97), and have *trivalized* the importance the
>RTA device.
>
>3. Cheating competitors (a few years back) and now money-no-object
>competitors with dual eqs (myself included) have *whored* the entire
>purpose of RTA in sound-offs.
>
>4. An RTA *is* a real-time analyzer. People should get some
>brochures/tech papers on various RTAs (LinearX, Audio Control, Coustic,
>etc or even some lab quality devices) before interpreting ramblings in
>this thread as the facts.
>
>5. An RTA needs some serious averaging to be consistant. Unfortunately,
>the meter most sound-offs use has a freeze button so a hopefully
>unbiased judge can pull you a curve out of thin air. Pink noise is not
>consistantly the same! So a snapshot of time with a freeze button is
>not an accurate picture! You must average pink noise readings over time
>for them to even start to mean anything (the meter I use can average up
>to 20 samples per second)   
>
>6. No two people hear alike.
>
>7. For test measurments, we usually want the response of the test
>device be linear (unweighted). ANSI weighting scales (A,B,C,etc) are
>designed to simulate the hearing response of the average human at
>different volume levels. Some meters offer weighting scales, some
>don't.
>
>8. A properly used RTA is a great thing.
>
>This all my own opinions and experience.
>Terry Miller
>
>Not the opinion of my employer. Thank a liberal, democrat, and/or
>lawyer for having to read so many stupid disclaimers.
>
>
>-- 
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