Popping Noise Chirp playing 1st audio of day from X1000

[amigasociety]

Anyone else have this issue? I have had it since day on on my X1000.

When I play the 1st audio of the day after booting my X1000 I get an odd noisy Pop or Chirp from my system. I can then stop playing the song and start it again, no chirp or pop and all is fine.

Really odd one and it is only the 1st audio of the day when I play a song whether it be AmigAMP or TuneNet, etc...

Here is a link to a video I took today of the sound.

You will hear a quick pop or chirp when I start the first song. I then stop it, start a new song, no issue, start the same song again, no issue.

Just that 1st play of the day.

TJ

http://www.youtube.com/watch?v=zkaYoDhPb8w

[amigasociety]

May have it fixed but will keep this thread here.

I had saw previous Anti Click post about setting the AHI prefs to 40ms. I had done this already but could not select 40MS so had 39ms. That did not help so I changed to 41ms, same issue.

Setting at 45ms I reboot and did not get the pop so might be OK now.

Will test for a day or two and see.

TJ

[zappa2009]

I replaced the C-media soundcard with my old Soundblaster Live. No Sound Chirp.

But i hope an Update switch the internal SoundCard on. (Network too )

[nbache]

post about setting the AHI prefs to 40ms. I had done this already but could not select 40MS so had 39ms. That did not help so I changed to 41ms, same issue.

About not being able to set the slider to an exact value: If you make the window larger (using the size gadget in the bottom right corner), the resolution of the slider will also increase, and you should be able to set it at the intermediate values as well - should you need this some other time .

Best regards,

Niels

[amigasociety]

Thanks nbache, that is very helpful.

TJ

[amigasociety]

Ah, spoke too soon!

45ms did not take care of the chirp. I guess after a power down of the X1000 and not just a reboot like I did yesterday, made the sound come back this AM when I freshly booted the X1000.

So 45ms for AHI Anti Click did not help.

Therefore, I went to max 100ms for Anti Click but I have the same chirp noise sorry to say. Maybe a tad shorter of a noise but still there.

Since 100ms appears max, I guess this did not fix it, although the chirp did sound less of a chirp and not as blatant.

Anyway, I re-opened a ticket with A-Eon/AmigaKit to see what they say.

Any help would be nice if someone here has an answer on what my issue is and if there is a way to correct it.

I am guessing one day when X1000 On-Board drivers work and we switch to the ethernet and sound from On-Board, and I remove this sound card that shipped with the X1000, then it will go away.

TJ

[LyleHaze]

First, let me be clear. I can suggest one possible cause, but this is just theory at this point.

A regular audio signal is bi-polar (both positive and negative) with a range of approximately 0.7 Volts
Most of our digital electronics have signals that swing from (near) Zero Volts to (near) whatever VCC is, 3.3, 5, or more Volts.

I think one possible explanation might be that an un-initialized output is at zero volts, but on the first initialization it moves to
a "half-voltage" point (say near 2.5 volts of 5).. which becomes the new "Zero" point from which it can swing positive or negative without
ever actually going below ground.
From an electrical point this can be accommodated by using a Capacitor in SERIES with the output, which will block the 2.5 offset voltage
and provide a true + and - output after the cap.

The only drawback would be a low-frequency "thump" the first time the card is powered up and initialized.

_IF_ this is correct, then the thump is gonna happen, but you can "force" it to happen during bootup by playing ANYTHING (even silence)
as part of the boot sequence. (see sys:prefs/sound)

OK, so it COULD be prevented by finding a sound card with true AC outputs. (there is a "class" spec for that, I don't recall which)
Or possibly by using SPDIF, which would move the problem to your receiver/amp.

Remember, this is all guesswork.. but I've built a few audio devices, and I am familiar with what these caps are for.