Testing sound of different MSX sound chips and their FPGA implementations

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By sdsnatcher73

Hero (538)

Аватар пользователя sdsnatcher73

09-05-2018, 18:11

Hmm, I didn't know C2 contained an AMP. When I first received my C2 I felt music was playing very distorted. I turned down the C2 SCC and FM volume to 2 to get an acceptable output (this was on an NMS8245). To me it sounded like the output was going over the acceptable range.

By Pencioner

Paladin (933)

Аватар пользователя Pencioner

09-05-2018, 22:28

SCC tests now. GR8NET was again well close to the original sound and best among others.

And about above comments on

  • C2 and PSU quality: i tested with other two computers and sound is the same
  • C2 and preamp: i will record with different volume levels configured in boot block and listen. if there's some audible difference, i will publish the recordings, otherwise i'll just let you know that it sounds similar

I have request, anybody? Who has Carnivore 2 - could you please record it's SCC sound? Would be great if i get also some recordings from homebrew cartridges (not from 8bits4ever) - to see if sound is similar, i wonder if some components (capacitors or DAC etc) might affect it.

Here's a vgmplay binary which don't play PSG, only SCC. I used tracks 08 and 09 from Laydock for MSX2 music rip for my tests (downloaded from vgmrips.net)

By Pablibiris

Paragon (1763)

Аватар пользователя Pablibiris

10-05-2018, 00:03

Pencioner wrote:

Who has Carnivore 2 - could you please record it's SCC sound? Would be great if i get also some recordings from homebrew cartridges (not from 8bits4ever) - to see if sound is similar, i wonder if some components (capacitors or DAC etc) might affect it.

Is tested in 8bitsever batch,Hardwaremaker batch and my own batch...with the same results.

By Pencioner

Paladin (933)

Аватар пользователя Pencioner

10-05-2018, 00:42

...Sorry, it was not Laydock tracks for SCC tests, it was Contra - apologies for the mistake...

By Grauw

Ascended (8406)

Аватар пользователя Grauw

10-05-2018, 01:32

Surprising that for a chip as seemingly simple as the SCC, there are still such differences! And indeed, the MFR disappoints a little bit, while the GR8NET does really well. And the C2, well… I have the feeling something’s consistently off in the mixing/DAC/filter/amp stage.

By gdx

Prophet (2984)

Аватар пользователя gdx

10-05-2018, 10:12

About PSG, look below.




PSG sound emulated by FPGA is buggy. The envelop is sometime inverted on Carnivore 2 and it is unrecognizable on MFR. In addition, parasites are more numerous on MFR.

Quote:

@gdx: I think it is well known that we subjectively tend to rate louder music as "better". A fairer comparison would be to try to amplify both recordings to similar levels.

70FD's FM sound is not just attenuated globaly but more or less depending played frequency. Otherwise, I did not notice big difference in ear even in drums. Therefore it seems illogical to me to say that the A1WSX sounds like too much filtering compared to 70FD.

Note: These remarks are only based on Pencioner's recordings. Maybe with another material, the results are different.

By mars2000you

Enlighted (5498)

Аватар пользователя mars2000you

10-05-2018, 10:46

.

By mars2000you

Enlighted (5498)

Аватар пользователя mars2000you

10-05-2018, 10:46

Impossible to see your pictures

The tinypng.com site says: {"error":"Forbidden","message":"TLS required"}

By gdx

Prophet (2984)

Аватар пользователя gdx

10-05-2018, 10:59




By Pencioner

Paladin (933)

Аватар пользователя Pencioner

10-05-2018, 14:19

Thanks, @gdx - now i see that difference between YIS503 and A1WX PSGs mostly likely is not because of audio circuit, they probably have different emulations in the MSX-engines, so that envelope differs a little (and no worries that Yamaha's is better as they has proper expertise in-house). That was very interesting finding.

The parasites on MFR might be a side effect of that sound was taken via Modulon with disconnected pin 49 - but expander still has it is own parasite noise. Btw, i can record it via non-expanded slot on YIS503 to see if it gets better.

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