RE: If feel so inadequate ...

Posted by Dave_K on July 17, 2020 at 07:38:43

In Reply to: If feel so inadequate ... posted by Ivan303 on July 16, 2020 at 06:58:34:

The original justification for oversampling was to be able to implement a really steep reconstruction filter. But you don't have to go beyond 8x to implement a steep filter, and even the steepest filter AKM offers isn't all that steep. It's not brick wall. So I honestly don't know what they gain by using such a high frequency clock. This particular DAC chip supposedly has the lowest distortion on the market. The fast clock might have something to do with that, but I don't know how. I've got an EE degree, but I only know the basics of how ADCs and DACs work. These days, the complexity of these parts is staggering.

I think filters 1-4 should be nearly indistinguishable because the difference in response between their "sharp" and "slow" options is pretty small. But filters 5 and 6 should be audibly different from the rest.

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Follow Ups Full Thread

Topic - Topping D90 filters? - Rod M 19:34:31 07/14/20 (25)

Thanks to all.... - Rod M 14:33:13 07/15/20 (0)

They are using the filters built into the AKM DAC - Dave_K 07:11:00 07/15/20 (2)

"low dispersion" - DrChaos 09:52:53 07/16/20 (1)

They're all FIR filters - Dave_K 07:22:16 07/17/20 (0)

Does it have a 'zero oversampling' mode? - Ivan303 06:05:14 07/15/20 (15)

RE: Does it have a 'zero oversampling' mode? - 13th Duke of Wymbourne 17:26:07 07/15/20 (0)

RE: Does it have a 'zero oversampling' mode? - AbeCollins 08:12:21 07/15/20 (6)

Yup me too! .................... - Cut-Throat 12:25:36 07/15/20 (3)

RE: Yup me too! .................... - Bob_C 20:07:08 07/15/20 (2)

RE: My only minor gripe... - AbeCollins 06:24:28 07/16/20 (1)

Agree ................... - Cut-Throat 06:33:46 07/16/20 (0)

Right now I enjoy 'no filter'... - Ivan303 10:26:58 07/15/20 (1)

RE: Like your cigarettes and coffee ? - AbeCollins 06:57:24 07/16/20 (0)

RE: Does it have a 'zero oversampling' mode? - Dave_K 07:28:54 07/15/20 (6)

What is the oversampling mode? - Ivan303 07:56:53 07/15/20 (5)

For PCM, 128x - Dave_K 09:01:58 07/15/20 (4)

That's 49 MHz ... - Ivan303 10:17:26 07/15/20 (3)

That's correct - Dave_K 12:57:17 07/15/20 (2)

If feel so inadequate ... - Ivan303 06:58:34 07/16/20 (1)

RE: If feel so inadequate ... - Dave_K 07/17/2007:38:43 07/17/20 (0)

The Manual is worthless, so, no sense going there......... - Cut-Throat 04:56:22 07/15/20 (1)

RE: The Manual is worthless, so, no sense going there......... - AbeCollins 08:14:25 07/15/20 (0)

RE: Topping D90 filters? - Bob_C 20:09:30 07/14/20 (2)

RE: Topping D90 filters? - AbeCollins 21:16:10 07/14/20 (1)

RE: Topping D90 filters? - Bob_C 21:24:23 07/14/20 (0)

Follow Ups

RE: If feel so inadequate ... - Dave_K 07/17/2007:38:43 07/17/20 (0)

RE: If feel so inadequate ...

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