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Old 19th October 2002, 05:55 PM   #1
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Default CS8420/AD1896 and 1541

Hi All
I may be totally wrong here and may have not read the datasheets properly(knowing me)but if the TDA 1541 can handle a 176.4KHz max sampling rate is there anything stopping me using a CS8420 or AD1896 and upsampling to 176.4KHz or lower and feeding it to the TDA1541 without oversampling?.
Smiffy
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Old 19th October 2002, 09:04 PM   #2
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oversampling or upsampling is the same.....the 1541 can handle 16 bit 176,4 khz
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Old 20th October 2002, 01:04 PM   #3
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Ta for the help
I always thought they were different.Haven't picked up a soldering iron for ages and have forgotten a lot of inf.On another note with reg 1541 which way do the versions go.Is R1 the lowest performing followed by S1 and then S2 the best?Thanks for the help.Just removed SAA7220 from Musical Fidelity Digilog.Sounds noticably better.Smiffy
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Old 16th April 2004, 12:18 AM   #4
Lenin is offline Lenin  United Kingdom
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Default A Digilog? Pleaes post some more info!

Hi Smiffy,

Just picked up a digilog myself - been planning to finally get stuck into some digital kit for a while.

Do you happen to have a schematic? (Mine has a mk3 board)

Could you post some more info on your mods, maybe a picture too?

Thanks.
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Old 16th April 2004, 12:39 AM   #5
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Quote:
oversampling or upsampling is the same
This is not quite true. According to the common usage of both terms, "oversampling" is the classic interpolation with a whole-numbered factor (mostly 4x, 8x, or 16x), whereas "upsampling" means asynchronous sample rate conversion with independent input and output clock. Exactly what CS8420, AD1896, and SRC4192 do.
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Old 16th April 2004, 05:09 AM   #6
jwb is offline jwb  United States
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They are both exactly the same process .... so your point is what again?

(Perhaps you forgot to mention that integer upsamples produce lower distortion, generally? Going from 44.1 to 88.2 is much better than 44.1 to 96)
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Old 16th April 2004, 08:01 PM   #7
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Originally posted by jwb
They are both exactly the same process .... so your point is what again?
If you mean to suggest that a digital filter like the DF1706 works in the same way as an ASRC like the SRC4192, then you are seriously mistaken.

ray.
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Old 16th April 2004, 09:24 PM   #8
jwb is offline jwb  United States
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It doesn't "work in the same way" but from an information theory standpoint the result is the same. The DF1704/6 is less complicated than an ASRC because it doesn't need a rate estimator, huge tables of FIR coefficients, and so forth. But if you consider what is happening to the signal in an ASRC with Fs_out == Fs_in * N where N is an integer, it is the same thing that would happen to the signal in an Nx oversampling filter.
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Old 16th April 2004, 09:41 PM   #9
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Originally posted by jwb
It doesn't "work in the same way" but from an information theory standpoint the result is the same. The DF1704/6 is less complicated than an ASRC because it doesn't need a rate estimator, huge tables of FIR coefficients, and so forth. But if you consider what is happening to the signal in an ASRC with Fs_out == Fs_in * N where N is an integer, it is the same thing that would happen to the signal in an Nx oversampling filter.
That is tenuous to say the least. One might as well argue that a Wankel engine is the same as a square 4 because they both take in fuel/air and have a rotating bit.

ray.
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Old 16th April 2004, 10:03 PM   #10
jwb is offline jwb  United States
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Sorry, I couldn't tell if there was an actual rebuttal in there somewhere. I'll make it more clear: an ASRC and an "oversampling digital filter" have the same effect on the information stream when the output-to-input ratio is an integer (2,4,8 etc). They both, to my knowledge, use interpolation and decimation filters to achieve the result. That the ASRC can do so asynchronously makes it far more complex, and indeed the ASRC induces further error on the signal with non-integer ratios. But they are not fundamentally different processes.

I await your educational remarks.
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