Subject: Re: [linux-audio-dev] open-source like hardware
From: Max Kovgan (smcmaugh_AT_techst02.technion.ac.il)
Date: Sun Jan 13 2002 - 21:47:31 EET
i'll drop my 10 cents of what i would expect it to be:
so far the most common features in professional audio/midi cards are:
1) as for Audio -
quality audio:
24/32 or more bit depth, \
up to 96 khz sampling freq.\ A->D and D->A
wide Freq. response, /
wide dynamic range. /
high SNR,
multi channel
internal low latency signal processing ( realtime effects )
possibility to load programs from harddisk in native format
[ software synthesis, effects ] and generally reprogram the DSPs
on the fly ... via PCI or maybe USB ?
2) as for MIDI:
all midi functions, including sequencing, recording etc.
MIDI in, out, through, multiple devices ["midi router",
this should not be the most complex thing, because the snr and other
delicate high speed audio issues do not disturb MIDI]
3) break out box, of course!
it shall contain the MIDI/Audio ins/outs, possibly LEDs :)
hmmm this all sounds like a really serious project for more than a year !
-=O0~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~O0=-
"He took his vorpal sword in hand:
Long time the manxome foe he sought -
So rested he by the Tumtum tree.
And stood awhile in thought."
[L.Carrol "Jabberwacky"]
On Sun, 13 Jan 2002, Rene Rebe wrote:
> Hi.
>
> From: Kristian <kristian.peters_AT_korseby.net>
> Subject: Re: [linux-audio-dev] open-source like hardware
> Date: Sun, 13 Jan 2002 17:06:31 +0100
>
> > "Pieter" <pieter.palmers_AT_student.kuleuven.ac.be> wrote:
> > | Would it help to use a DSP with on-chip PCI support?
> > | (I have no experience with PCI. The only thing I know is that ISA was a
> > | lot easier :)
> > |
> > | (I like the external box idea... I think it will be easier to get
> > | good SNR & good EM interference suppression)
> >
> > The point I'm interested in is how can I get my ASM program on that DSP chip ? As far as I understand this so far I need to put a little filter-program or whatever on this chip (I need to program this DSP.) to hear anything useful out of it.
>
> This is not soo hard. We simply have to define a API for this. Also
> our _firmware_ might be downloaded by the ALSA-driver itself (like it
> is done for the Adaptec aic7xxx devices).
>
> Possibilies:
>
> - seriel transmitting via PIO <sucks>
> - direct copy in memory-mapped address space <only possible if it is a
> PCI card>
> - or some well defined packages that are transmitted over firewire <but
> then we need the firware in an EEPROM or FLASH-ROM.
> - I do ont know if ALSA has an interface for this yet - but since this
> are custom effects anyway, it would be very hard to add a gernic way
> for this into ALSA. (maybe some external tool like the envy24control
> for the ICE chips?)
>
> But defineing in which way your code gets to the bord is not the point
> to start with ;-)
>
> 1st: needed functionallity
> 2nd: whar man and material resources are available
> 3rd: with what components would we like to start (PCI card, firewire,
> ..)
> ... more detailed planing ...
>
> > *Kristian
> >
> > ·· · · reach me :: · ·· ·· · · ·· · ·· · ··· · ·
> > :: http://www.korseby.net
> > :: http://www.tomlab.de
> > kristian_AT_korseby.net ....::
>
>
> k33p h4ck1n6
> René
>
> --
> René Rebe (Registered Linux user: #248718 <http://counter.li.org>)
>
> eMail: rene.rebe_AT_gmx.net
> rene_AT_rocklinux.org
>
> Homepage: http://drocklinux.dyndns.org/rene/
>
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