* Re: emu10k1 sample rates?
@ 2004-10-13 14:56 Peter Zubaj
2004-10-13 15:12 ` Lee Revell
2004-10-18 6:41 ` Asbjørn Sæbø
0 siblings, 2 replies; 6+ messages in thread
From: Peter Zubaj @ 2004-10-13 14:56 UTC (permalink / raw)
To: kouhia; +Cc: alsa-devel
Hi,
AFAIK:
>When I record from emu10k1 (e.g., from livedrive linein2)
>with sample rate 44100 Hz, then what sample rate the
>emu10k1 is running at?
48000 Hz
>I have heard that emu10k1 runs only at rate 48000 Hz. Yes or no?
Yes, only on 48000 Hz
>(1) At what rate A/D converters are running when I record at 44100 Hz?
48000 Hz
>(2) Who does the conversion to 44100 Hz?
emu10k1 - whe it writes samples to buffers
>Specially I would like to know if Alsa is doing the conversion
>with software, e.g., by boldly skipping samples.
Not as default, but on demand (when you use plughw device and hardware
doesn't support requested rate).
>If the conversion is done in emu10k1 with the rate converters
>provided by E-mu, then what quality setting is used? MS Windows
>driver provides two quality settings (the good quality and the
>best quality). Is the quality setting the emu10k1 hardware property?
I don't think this has something to do with emu10k1.
I think this is for software resamplink used in windows.
AFAIK there is no way to set conwersion quality (it is always same) in
emu10k1.
>Also, if the emu10k1 can
>be made to run at rate 11025 Hz, then that means 4x more processing
>power for frequencies less than 5000 Hz.
emu10k1 is sample locked (it runs 512 instruction per sample) and runs
only on 48000. If it can be switched to 11025 Hz, power will be still
same as on 48000, but it can't.
Audigy 2 is litle diffrent. There is another part which can run at 48,
96, 192 KHz, runs in paralel to emu10k2, but there is not DSP and this
part is not supported under linux.
Peter Zubaj
____________________________________
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^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: emu10k1 sample rates?
2004-10-13 14:56 emu10k1 sample rates? Peter Zubaj
@ 2004-10-13 15:12 ` Lee Revell
2004-10-18 6:41 ` Asbjørn Sæbø
1 sibling, 0 replies; 6+ messages in thread
From: Lee Revell @ 2004-10-13 15:12 UTC (permalink / raw)
To: Peter Zubaj; +Cc: kouhia, alsa-devel
On Wed, 2004-10-13 at 10:56, Peter Zubaj wrote:
> Audigy 2 is litle diffrent. There is another part which can run at 48,
> 96, 192 KHz, runs in paralel to emu10k2, but there is not DSP and this
> part is not supported under linux.
>
This could in theory be supported, because this part that does 96/192 is
the P16V chip which is supported in the emu10k1x driver thanks to James
Courtier-Dutton. I think the issue is just that no one has time to do
it.
Lee
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^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: emu10k1 sample rates?
2004-10-13 14:56 emu10k1 sample rates? Peter Zubaj
2004-10-13 15:12 ` Lee Revell
@ 2004-10-18 6:41 ` Asbjørn Sæbø
1 sibling, 0 replies; 6+ messages in thread
From: Asbjørn Sæbø @ 2004-10-18 6:41 UTC (permalink / raw)
To: Peter Zubaj; +Cc: alsa-devel
On Wed, Oct 13, 2004 at 04:56:08PM +0200, Peter Zubaj wrote:
> Hi,
>
> AFAIK:
(kouhia@nic.funet.fi:)
> >When I record from emu10k1 (e.g., from livedrive linein2)
> >with sample rate 44100 Hz, then what sample rate the
> >emu10k1 is running at?
>
> 48000 Hz
> [...]
> >(2) Who does the conversion to 44100 Hz?
>
> emu10k1 - whe it writes samples to buffers
Does this mean that the latency in the card will be higher when working
at 44100 than when working at 48000?
Asbj.S.
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^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: emu10k1 sample rates?
@ 2004-10-18 6:52 Peter Zubaj
0 siblings, 0 replies; 6+ messages in thread
From: Peter Zubaj @ 2004-10-18 6:52 UTC (permalink / raw)
To: asbjs; +Cc: alsa-devel
>Does this mean that the latency in the card will be higher when working
>at 44100 than when working at 48000?
No, latency will be same. It is in hardware and is active at 48000 too.
Peter Zubaj
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^ permalink raw reply [flat|nested] 6+ messages in thread
* emu10k1 sample rates?
@ 2004-10-13 13:10 Juhana Sadeharju
2004-10-13 14:34 ` Giuliano Pochini
0 siblings, 1 reply; 6+ messages in thread
From: Juhana Sadeharju @ 2004-10-13 13:10 UTC (permalink / raw)
To: alsa-devel
Hello.
This is the third time I ask these questions within a couple of
years because I have not got the answer. So, please reply and
explane very carefully.
When I record from emu10k1 (e.g., from livedrive linein2)
with sample rate 44100 Hz, then what sample rate the
emu10k1 is running at?
I have heard that emu10k1 runs only at rate 48000 Hz. Yes or no?
If yes, then I would like to know:
(1) At what rate A/D converters are running when I record at 44100 Hz?
(It would be perfectly ok if the A/Ds would run at 48000 Hz.)
(2) Who does the conversion to 44100 Hz?
Specially I would like to know if Alsa is doing the conversion
with software, e.g., by boldly skipping samples.
If the conversion is done in emu10k1 with the rate converters
provided by E-mu, then what quality setting is used? MS Windows
driver provides two quality settings (the good quality and the
best quality). Is the quality setting the emu10k1 hardware property?
Think also the extreme cases such as rate 11025 Hz. At that rate
the rate conversion becomes important. Also, if the emu10k1 can
be made to run at rate 11025 Hz, then that means 4x more processing
power for frequencies less than 5000 Hz.
Juhana
--
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for developers of open source graphics software
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^ permalink raw reply [flat|nested] 6+ messages in thread* Re: emu10k1 sample rates?
2004-10-13 13:10 Juhana Sadeharju
@ 2004-10-13 14:34 ` Giuliano Pochini
0 siblings, 0 replies; 6+ messages in thread
From: Giuliano Pochini @ 2004-10-13 14:34 UTC (permalink / raw)
To: Juhana Sadeharju; +Cc: alsa-devel
On Wed, 13 Oct 2004, Juhana Sadeharju wrote:
> This is the third time I ask these questions within a couple of
> years because I have not got the answer. So, please reply and
> explane very carefully.
>
> When I record from emu10k1 (e.g., from livedrive linein2)
> with sample rate 44100 Hz, then what sample rate the
> emu10k1 is running at?
>
> I have heard that emu10k1 runs only at rate 48000 Hz. Yes or no?
No, according the driver. It can record at these rates (line 148 of
emu10k1/emupcm.c): 8000, 11025, 16000, 22050, 24000, 32000, 44100, 48000.
>From the mic it only supports 8KHz and from efx (what is it ?) only 48K.
> Specially I would like to know if Alsa is doing the conversion
> with software, e.g., by boldly skipping samples.
Yes, if you choose a frequency which is not supported. If you want to be
sure that no resampling is done, use the hw: device instead of plughw: .
In that case if the hw params are not supported you get an error (eg.
arecord -Dhw: -fcd xyz.wav).
--
Giuliano.
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^ permalink raw reply [flat|nested] 6+ messages in thread
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2004-10-13 14:56 emu10k1 sample rates? Peter Zubaj
2004-10-13 15:12 ` Lee Revell
2004-10-18 6:41 ` Asbjørn Sæbø
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2004-10-13 13:10 Juhana Sadeharju
2004-10-13 14:34 ` Giuliano Pochini
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