@DaveAE

A bit OT, but what is the main difference between the HiFi and Normal modes?

What does AHI do differently with HiFi modes? - Or is it down to the
actual hardware?

Cheers,
Bean.

_________________
OS4.1 + SAM Flex
RIP my A1XE.. that used to have an appetite for batteries!

@Bean

Didn't try the mutes yet. You can try yourself in Mixer btw.

Hifi modes mix in 32-bit, non-Hifi in 16-bit.

_________________
Audio Evolution
http://www.audio-evolution.com

If someone were to use the AC97 exclusively, what should they do with the 'mixer setlevels' statement in User-Startup? Comment it out? Leave it as is? Or does it matter?

_________________
'unfixed' A1XE, 512mb RAM, plug-in USB card, Sil 0680 IDE card, Radeon 9250, built-in sound, OS4.1 update 5.

@RacerX

I'm not sure what you mean. Mixer 1.16 supports the VIA/AC97.

_________________
Audio Evolution
http://www.audio-evolution.com

@Bean

"Have you tried cutting off all the unused inputs on the new Mixer?"

It makes no difference, in fact I can master mute and the noises are still there.

It seems that all the hard work to get the drivers working may come to nothing if we have to revert to PCI sound cards to prevent the noise.

Interestingly the network traffic noise is only apparent when streaming music from a music server I have on a different computer. When I connect to that computer as a smbfs drive and play the same music there is no noise apparent. The pci noise can still be heard though.

Also, there is no difference when setting the units to non hifi modes in AHIprefs.

_________________
AmigaONE XE G4
____________________

@gadgetgaz


Quote:

Also, there is no difference when setting the units to non hifi modes in AHIprefs.

That's rather obvious because the noise isn't coming from AHI.

_________________
Audio Evolution
http://www.audio-evolution.com

@DaveAE

OK thanks. That supports what I said in my last paragraph. Can you comment on my second to last paragraph that referred to streaming audio?

_________________
AmigaONE XE G4
____________________

@gadgetgaz

What can I say? There's obviously no register in the codec for 'reducing bus noise'. I haven't heard bus noise during playback though, but I haven't downloaded anything while playing back either. Same thing happens on classics when using Paula while using IDE. Since there are PC's with both good and bad implementations of onboard audio, I can only conclude that the A1 onboard audio belongs to the badly implemented group.

_________________
Audio Evolution
http://www.audio-evolution.com

@DaveAE

Circuit designs with both digital & analog should have 2 grounds. A digital gnd for the digital circuits & an analog ground for the analog circuits. These 2 gnds should only be tied together at the PS gnd & no where else. Digital chips generate a lot of gnd noise & if the gnd traces are not laid out right, can modulate the audio. If you hear digital noise & can hear a difference when you move the audio card to a different slot, it could be a gnd layout problem. In which case the best you can do is to use the slot with the shortest gnd run back to the PS, which ever one that is.

You're right, no software can fix this kind of problem.

Last edited by sundown on 04-Nov-2005 at 08:51 PM.

_________________
Hate tends to make you look stupid...

@sundown

Codecs can be programmed to remove and lesson playback noise.
there are countless plugins that look for white noise and "treat" audio as it goes by.

Karoke is another example of where specific audio frequencies are targeted for reduction.

Noise reduction systems like Dolby are another.

If the output h/w is introducing the noise then it's different, that makes it very difficult to minimize as the source is clean and the noise is added after the audio mixing or treatment.

Perhaps some inline caps could help if you could find the specific lines for output. It's a nasty hack though if you atempted that kind of minute surgery at all.

Last edited by SHADES on 04-Nov-2005 at 08:56 AM.

_________________
It's not the question that's the problem, it's the problem that's the question.

@DaveAE

Hi,

thanks for this great thing!
It works fine on my XE, except for the half frequency sometimes and a crackling when the driver initializes.

But I wonder about another thing:
How about SPDIF out? I had a look into my XE documentation (on the Eyetech install cd) and it says that JP31 is a connector for SPDIF out.
I have absolutely no clue what I would have to connect there, but does (or will) the driver support that output?

Thanks & Ciao, Alfred

@Serpi

There is a little info on SPDIF, including a link to some additional info here:
http://amigaworld.net/modules/newbb/viewtopic.php?topic_id=13849&forum=14

I don't know whether @Wegster has looked into this any further.

Best Wishes,
#6

_________________
This posting, in its entirety, represents solely the perspective of the author.
*Secrecy has served us so well*

@Serpi

I don't think you can easily obtain a cable that connects to the 2 pins and has a digital out on a cinch socket on the other side, so I didn't support it.

I also don't think I can solve the pop-noise when the driver initializes, since I can't control the volume before it is initialized. The more 'pro' codecs fade-in nicely by themselves when powered up.

_________________
Audio Evolution
http://www.audio-evolution.com

@number6

There's no real relevant S/PDIF info there. The problem is how to get from 2 onboard pins to some decent connector.

_________________
Audio Evolution
http://www.audio-evolution.com

@DaveAE

Understood. I hadn't read the article link, so was unaware of it's contents.

Best Wishes,
#6

_________________
This posting, in its entirety, represents solely the perspective of the author.
*Secrecy has served us so well*