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- Newsgroups: rec.video
- Path: sparky!uunet!nwnexus!kanefsky
- From: kanefsky@halcyon.com (Steve Kanefsky)
- Subject: Re: Sony TA-E2000ESD Source Direct
- Message-ID: <1993Jan26.180051.26609@nwnexus.WA.COM>
- Keywords: Dolby prologic
- Sender: sso@nwnexus.WA.COM (System Security Officer)
- Organization: The 23:00 News and Mail Service
- References: <1993Jan25.045508.17234@nwnexus.WA.COM> <8459@tekig7.PEN.TEK.COM> <8461@tekig7.PEN.TEK.COM>
- Date: Tue, 26 Jan 1993 18:00:51 GMT
- Lines: 40
-
- In article <8461@tekig7.PEN.TEK.COM> gregr@tekig5.pen.tek.com (Gregory S Rogers) writes:
- >
- >Steve Kanefsky replied:
- >
- >>>Today, I finaly got a chance to do it and I have to agree with your
- >>>assessment. There was clear digital clipping with source-direct off when
- >>>the input level was at maximum, but no digital clipping when source-direct
- >>>was turned on -- which proves almost conclusively that analog sources do
- >>>*not* go through A/D and D/A conversion with source-direct on.
- >
- >>>Steve Kanefsky
- >
- >Please be aware in the demonstration that I described above and that Steve
- >has verified that turning the input level control all the way to MAX is really
- >not the best way to do it. I was trying to shorten the description a little
- >bit by saying turn it to MAX. Actually the best process is to use a steady
- >tone from a CD test record for instance, (or a sinewave generator if you know
- >what you are doing), and then advance the input level until the OVERload
- >indicator lights. Then advance the input level JUST a LITTLE bit more until
- >you hear the distortion. The OVER indicator lights about 1 dB prior to the
- >actual A/D overload point. You must be in the source direct OFF mode.
-
-
- Still, doing it by turning the input level to max on normal material (as
- opposed to test tones) works just fine (if you have a CD player with peak
- search, that's a good way to find a sufficiently-high-level signal to
- use). There may be analog distortion induced by using the maximum input
- level in source-direct mode, but it's pretty easy to distinguish this from
- the digital clipping that occurs when source-direct is off (which sounds
- like very short bursts of static).
-
- The analog distortion explains why there's a digital input level control
- and why the OVER indicator can light even with a digital source.
-
- --
- Steve Kanefsky
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