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Topic: Hercules Fortissimo III and CS4624 (Read 5633 times) previous topic - next topic
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Hercules Fortissimo III and CS4624

anyone know if this card resamples to 48KHz or plays back natively?

Hercules Fortissimo III and CS4624

Reply #1 –
It performs sample rate conversion. Sorry.
 

Hercules Fortissimo III and CS4624

Reply #2 –
Are you sure? I mean, CS4642 supports variable output samplerate, doesn't it (32khz, 44.1khz, 48khz)?

Hercules Fortissimo III and CS4624

Reply #4 –
Quote
http://www.cirrus.com/en/products/pro/detail/P41.html

Quote
AC `97 2.1 Link CODEC
...
High-quality hardware sample rate conversion

OK, thanks... is it the same for CS4630?

Hmmmm... anyway, it doesn't mention fixed output samplerate. But I believe you.

Hercules Fortissimo III and CS4624

Reply #5 –
I took a quick glance through the AC97 specs on Intel's site and I am not so sure that "AC Link" means it resamples.  From what I read it does indeed mean that the communication between the DSP and the output codec takes place at 48KHz, but it also talks about that not necessarily meaning the sample data is 48KHz.  It talked about transferring a 44.1KHz stream over that and how the remaining 3.9KHz of bandwidth was simply zeroes.  Check out section 4 of ftp://download.intel.com/labs/media/audio...ad/ac97_r23.pdf which starts at the bottom of page 25, and especially 4.2.1 on page 27... "If desired, streams can be sent across the AC-link in a negotiated, 'tag interleaved' fashion, thereby eliminating the need for up-smapling to a common rate such as 48KHz."  However, this is AC97 r2.3 and the card I have here mentions meeting the AC97 r2.1 standard so it may still resample if r2.1 differs in that respect from r2.3.  Well, found the r2.1 specs now, and they also state pretty much the same information down in Appendix A "Variable Sample Rate Extension."  So, does it actually resample?  Dunno.  I asked in Hercules's tech supp forum anyways, now that I found it.

<edit> ok, it doesn't mean zeroes specifically, it mentions that the null data could be tacked on to the end of the sample or tacked onto the end, depending on how you designed your FIFOs (or something close to that, haha)

<edit> whoops...tacked onto the end or evenly interleaved, that should have read

Hercules Fortissimo III and CS4624

Reply #6 –
Quote
OK, thanks... is it the same for CS4630?

CS4630: http://www.cirrus.com/en/products/pro/detail/P42.html

Quote
Hmmmm... anyway, it doesn't mention fixed output samplerate. But I believe you.


There's a possibility of variable sample rates in AC'97 2.1 (see ftp://download.intel.com/labs/media/audio...oad/ac97r21.pdf, p.60f), but i don't know of any consumer-level card with such a chipset where this is implemented (extra effort vs. little customer demand?). And since the Fortissimo II - which uses the same chipset - definitely has a fixed sampling rate of 48 KHz, it's quite safe to assume that the Fortissimo III is no different.

P.S.: Even my card with the CS4630 (Hercules Game Theater XP) resamples everything to 48 KHz.

Hercules Fortissimo III and CS4624

Reply #7 –
are you basing that on the fact that one of the listed features is hardware resampling?  Or is there some way to actually verify that it resamples everything?  Actually come to think of it you can just run a freq sweep through it and see if you hear aliasing artifacts in the very upper range, no?

Hercules Fortissimo III and CS4624

Reply #8 –
Quote
Actually come to think of it you can just run a freq sweep through it and see if you hear aliasing artifacts in the very upper range, no?

Resampling doesn't need to add any aliasing artifacts. Infact, I just created a frequency sweep at 42kHz sampling rate just to be sure to avoid standards, and there were zero aliasing problems that I could hear.

Hercules Fortissimo III and CS4624

Reply #9 –
Quote
There's a possibility of variable sample rates in AC'97 2.1 (see ftp://download.intel.com/labs/media/audio...oad/ac97r21.pdf, p.60f), but i don't know of any consumer-level card with such a chipset where this is implemented (extra effort vs. little customer demand?). And since the Fortissimo II - which uses the same chipset - definitely has a fixed sampling rate of 48 KHz, it's quite safe to assume that the Fortissimo III is no different.

P.S.: Even my card with the CS4630 (Hercules Game Theater XP) resamples everything to 48 KHz.

Sorry for bringing the old topic up... but this is interesting.

Quote
Me:
I am interested in one thing about this soundcard - does it have fixed samplerate on analog output?

TerraTec:
Hello,
the digital output from the DMX Xfire has a fixed samplerate (48kHz), but the analog output has a variable samplerate, depending on the audio file you are playing.


DMX Xfire 1024 uses CS4624...

Hercules Fortissimo III and CS4624

Reply #10 –
Interesting. We should think of a good way to test this, i.e. a special sample. Ideas?

I'll get a Fortissimo III for my second PC soon (replacing some other card i don't wanna mention  ), that would be a good opportunity to test it.

Hercules Fortissimo III and CS4624

Reply #11 –
Quote
Interesting. We should think of a good way to test this, i.e. a special sample. Ideas?

I'll get a Fortissimo III for my second PC soon (replacing some other card i don't wanna mention  ), that would be a good opportunity to test it.

RMAA graphs should show something? Or not?
Well, my brother has DMX Xfire 1024 (using Gamesurround Fortissimo II 6.07 Driver, so this could affect that fact, but still can reinstall it with TerraTec driver).

Hercules Fortissimo III and CS4624

Reply #12 –
Quote
I'll get a Fortissimo III for my second PC soon (replacing some other card i don't wanna mention  ), that would be a good opportunity to test it.

ass bee live

Hercules Fortissimo III and CS4624

Reply #13 –
Well, maybe that variable output on DMX Xfire explains price difference between it and Fortissimo II.