Low-distortion Audio-range Oscillator - Page 79 - diyAudio
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Old 24th October 2012, 03:26 AM   #781
RNMarsh is offline RNMarsh  United States
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And one-bit can be super fast. additional filtering of noise et al can be easily implemented.
I dont know how to do it, but I am sure others do. I can live with the circuits here for a few spot freq. But wouldn't be be great if ---- It's just a matter of time before its done... probably sooner than later - as all the pieces exist in some form. Thx - RNM

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Old 24th October 2012, 04:18 AM   #782
davada is offline davada  Canada
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What amount of distortion and noise is seen from SACD?
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Old 24th October 2012, 04:42 AM   #783
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SACD has a lot of HF noise from the noise shaping. The internal technology of SACD is very similar to that of all the current DACs usually something the 4 bits oversampling with lots of tricks to make it all work. They are very good but only to the -100 dB level. The ADC's are much better (see above).

Depending on what you are testing a good sound card and RMAA would be more than adequate with -100 dB distortion and measurements to 90+ KHz. Few real audio chains are that good or even close in practice.
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Old 24th October 2012, 02:50 PM   #784
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It looks like the original prototype of our oscillator will be at this years BA.

EDN -- 11.10.94 Oscillator keeps THD below 1 ppm | EDN
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Old 24th October 2012, 03:04 PM   #785
1audio is offline 1audio  United States
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Does the VCA limit the performance? They seem an almost ideal solution to the AGC issue.

Are you going to be at Burning Amp?
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Old 24th October 2012, 06:25 PM   #786
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Quote:
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Does the VCA limit the performance? They seem an almost ideal solution to the AGC issue.

Are you going to be at Burning Amp?
Don't think so, we actually were able to tune it to the limit of our equipment (~-130dB) at which point I could not make any more claims.

Hard to believe but I have to miss BA this year.
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Old 24th October 2012, 06:50 PM   #787
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Quote:
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Does the VCA limit the performance? They seem an almost ideal solution to the AGC issue.
THAT corp makes various VCA's that might be useful.
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Old 24th October 2012, 07:18 PM   #788
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THAT corp makes various VCA's that might be useful.
Yes, it could be adapted to their 2181 I think. A nice project for someone since this oscillator has lots of output and now we could find its limits.
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Old 24th October 2012, 07:30 PM   #789
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Bateman used the SSM2018.
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Old 24th October 2012, 08:17 PM   #790
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Bateman used the SSM2018.
I wonder why.

Just trying to be unbiased, THAT uses the Blackmer style while we use the Doug Frey style VCA's. The key is to have the VCA process as little of the signal as possible, even at 20ppm VCA distortion (.002%) it can only contribute a small percentage to the signal path. Tuning these things is a pain.
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