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Old 12th October 2004, 05:32 AM   #21
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Default Re: Re: No, it won't "bother" it.....

Quote:
Originally posted by rfbrw


If he can do this
with a 8x oversampling dac, he may well enjoy the HF hash.
so what is it that I hear? jitter?
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Old 12th October 2004, 05:55 AM   #22
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Default Re: Re: Re: No, it won't "bother" it.....

Quote:
Originally posted by dieringe


so what is it that I hear? jitter?
Without actually hearing what you hear, I can't possibly comment but as the first image occurs at 352.8kHz when 8x oversampling is applied, I doubt its an alias thats to blame.
An error in your construction of the D1 output stage would seem to be a more likely candidate.
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Old 12th October 2004, 07:12 AM   #23
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Thumbs down Re: Re: Optimizing a CS8414 + DF1704 + 4x PCM1704 DAC?

Quote:
Originally posted by Fabian


It will have exactly the same volume as when it is fed with 24bit data. You have to align the MSB of the 16bit data stream with the MSB of the DAC input. A working basic circuit can be found by clicking the link provided by Hattori Hanzo. Modestly said, I think the PCM1704 is a good alternative to TDA 16bit DACs.

I was referring to the case NOT using shifregisters.
The circuit by Hattori Hanzo will degrade the sound for sure and also contains too many parts.
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Old 12th October 2004, 07:41 AM   #24
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Lightbulb Aliasing and Filtering

Quote:
Originally posted by borges
Without analog filtering, you get linear phase response. However, designing a linear-phase digital filter is actually hard to avoid, no matter the rollof.

Greetings,

BÝrge
Hi BÝrge,
An analog Bessel low pass filter has linear phase or constant group delay in the pass band and is not hard to design.
The only problem is the Bessel does not have a sharp cut-off at the crossover frequency. This makes the case a difficult one if you go non-oversampling as you want to filter all high frequency products above 20kHz, yet want to preserve a flat response in the 20-20kHz band. In the very early days of the CD we had high order Butterworth brick-wall filters that inevitable had a lot of ringing on the pulse response. Common knowledge in DA-conversion is that the highest frequency of interest should be about 10 times lower than the sampling frequency in order to avoid aliasing distortion and filtering problems. In the case of NON-OS this simply cannot be accomplished as you would end up with a 4,4 kHz filtered audio signal. With 8x oversampling no problem. Unfortunately we cannot change the format of the redbook CD.
Yes and Jocko is right about the brick-wall filter at the recording end before the AD converter. Here obviously we can do nothing about it.
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Old 12th October 2004, 10:01 AM   #25
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Default Re: Re: Re: Re: Optimizing a CS8414 + DF1704 + 4x PCM1704 DAC?

Quote:
Originally posted by Peter Daniel


Here's what Madrigal's using in their $17K DAC . The chips under nude Vishays are PCM1704 http://www.marklevinson.com/image_li...30_6DAC_lo.jpg

they still don't get it

The PCM1704 has a clear digital side (pins 1 to 10) and an analog side (11 to 20) hence should be laid out 90 degrees rotated compared to what Levinson does

some things are so simple......
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Old 12th October 2004, 10:31 AM   #26
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Talking Re: Re: Re: Re: Optimizing a CS8414 + DF1704 + 4x PCM1704 DAC?

Quote:
Originally posted by Peter Daniel


Here's what Madrigal's using in their $17K DAC . The chips under nude Vishays are PCM1704 http://www.marklevinson.com/image_li...30_6DAC_lo.jpg

Hi Peter,
Funny seeing OPA627AP's in a US$ 17,000 DAC and not OPA627BP's.
Highend, esoterica........?? Maybe be in the next, even more higher priced version?
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Old 12th October 2004, 10:52 AM   #27
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Default Re: Re: Re: Re: Optimizing a CS8414 + DF1704 + 4x PCM1704 DAC?

Quote:
Originally posted by Peter Daniel

Here's what Madrigal's using in their $17K DAC . The chips under nude Vishays are PCM1704 http://www.marklevinson.com/image_li...30_6DAC_lo.jpg
ok, but what's the type of these caps?
what are Vishays, why are they nude and why are they on the chips?

poor design, only 2 PCMs altogether I guess?
edit: no thats wrong
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Old 12th October 2004, 11:09 AM   #28
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Question 743 Thingy

Yeah, and what is that 743 thingy. Oh, I see a LT1027 5V reference.......
Where do we need that for in this DAC?
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Old 12th October 2004, 11:51 AM   #29
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Default Re: Re: Re: Re: Optimizing a CS8414 + DF1704 + 4x PCM1704 DAC?

Quote:
Originally posted by Peter Daniel


Here's what Madrigal's using in their $17K DAC . The chips under nude Vishays are PCM1704 http://www.marklevinson.com/image_li...30_6DAC_lo.jpg

it looks like the vishays' legs are shorted at the PCB, or am I wrong ?

cheers
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Old 12th October 2004, 12:05 PM   #30
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Default Re: Re: Re: Re: Re: Optimizing a CS8414 + DF1704 + 4x PCM1704 DAC?

Quote:
Originally posted by Guido Tent
The PCM1704 has a clear digital side (pins 1 to 10) and an analog side (11 to 20) hence should be laid out 90 degrees rotated compared to what Levinson does
but what are AD826 doing and why are they on the digital side?
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