Re: [linux-audio-dev] Linux friendly, portable digital recording devices?

i recall that len moskowitz was working on an ipaq-based recorder. i
guess the web site is http://www.core-sound.com/.
it's probably out of your price range, though.

Ian Howard wrote:
> Hey all,
>
> We are looking for some portable digital recording devices with the
> following criteria:
>
> - very small
> - durable
> - near $100 ($100-150)
> - usb compatible
> - linux + windows friendly
> - mic-in with a reasonable signal-to-noise ratio
> - descent quality recordings
> - battery powered
>
> We intend to distribute about 10 - 20 of these units to radio
> journalists in Mali, whom will use these devices to collect material for
> their programs which they can then edit in Audacity and broadcast on the
> air.
>
> We are looking at devices such as the iRiver 190T
>
> Any one have any experience with such devices, in particular using them
> with linux?
>
> Ian
>
>
>
>
>
> On Sun, 2004-12-26 at 12:06 -0500,
> linux-audio-dev-request@email-addr-hidden wrote:
>
>>Send linux-audio-dev mailing list submissions to
>> linux-audio-dev@email-addr-hidden
>>
>>To subscribe or unsubscribe via the World Wide Web, visit
>> http://music.columbia.edu/mailman/listinfo/linux-audio-dev
>>or, via email, send a message with subject or body 'help' to
>> linux-audio-dev-request@email-addr-hidden
>>
>>You can reach the person managing the list at
>> linux-audio-dev-owner@email-addr-hidden
>>
>>When replying, please edit your Subject line so it is more specific
>>than "Re: Contents of linux-audio-dev digest..."
>>
>>
>>Today's Topics:
>>
>> 1. Re: Tascam US428 Continued hangups (Spencer Russell)
>>
>>
>>----------------------------------------------------------------------
>>
>>Message: 1
>>Date: Sun, 26 Dec 2004 02:09:21 -0800
>>From: Spencer Russell <Spencer.Russell@email-addr-hidden>
>>Subject: Re: [linux-audio-dev] Tascam US428 Continued hangups
>>To: linux-audio-dev@email-addr-hidden
>>Message-ID: <20041226100921.GA12396@email-addr-hidden>
>>Content-Type: text/plain; charset=us-ascii
>>
>>On Fri, Dec 24, 2004 at 12:05:07PM -0500, Rui Nuno Capela wrote:
>>
>>>...
>>>device. It was probably this very one that was aunting you before. After
>>>some attention and furious alsa-bugtracker exchange, Karten Wiese has been
>>>able to solve this, even tought he's got no OHCI hardware near him.
>>>
>>
>>I was watching that thread a little, because my symptoms were
>>very similar. Strangely, though, I have a UHCI based card, so I'm
>>not sure why I was seeing similar symtoms.
>>
>>
>>>Then Karsten did it again. He crafted a special jackd alsa/usx2y backend
>>>which enabled the so-called raw-usb mode of operation. And it was just
>>>yesterday I have proposed the merge into the official alsa backend driver
>>>on the jackit-devel list. With this new experimental stuff, one can run
>>>jackd in realtime with pretty lowest-latency parameters, without aural
>>>artifacts (i.e. crackling). AFAICT this is a greatest breakthrough on the
>>>USB audio arena, so I would think twice about getting rid of your US428 ;)
>>>
>>
>>I'm having a bit of trouble with the usx2y backend to jackd. I
>>bastardized the jackd-us2xy rpm to make a nice deb file, but
>>jackd still says "unknown driver 'usx2y'". Even downloading and
>>compiling the source, and running it directly from the directory
>>it ws compiled into. And does it automatically use the rawusb
>>interface? What's the advantage of using the usx2y driver as
>>opposed to the alsa driver?
>>
>>
>>>So my recipe goes like this:
>>>
>>>1. Have REALTIME_PREEMPT on the kernel config.
>>>
>>>2. Make sure you have loaded the latest snd-usb-usx2y>=0.8.7.1 (as of
>>> latest alsa-kernel cvs).
>>>
>>>3. Tune the RT priorities (SCHED_FIFO) of the time-audio critical IRQ
>>> threads:
>>> 90 - timer (IRQ 0)
>>> 80 - rtc (IRQ 8)
>>> 70 - snd (or whatever your PCI soundcard will hook, usually IRQ 5)
>>> 60 - usb (ohci_hcd or uhici_hcd, usually IRQ 10)
>>> You should have schedutils installed (chrt) for this exercise.
>>>
>>>4. Load the snd-usb-usx2y with the nrpacks parameter set for:
>>> a. high-stability: nrpacks=4
>>> b. low-latency: nrpacks=1
>>> Anyway, be advised that you can only run the forementioned "rawusb"
>>> mode if you set on this later one (modprobe snd-usb-usx2y nrpacks=1).
>>>
>>>Run your jackd command line (or qjackctl;) as usual, but given the above
>>>priority tunning, you should try e.g. jackd -R -P60 ...
>>>
>>
>>Thanks a lot for this detailed info! I recompiled the newest
>>snd-usb-usx2y driver, but how do I tune RT priorities? I got the
>>schedutils package, but I'm having trouble finding details on how
>>to use chrt.
>>
>>Thanks again for the info.
>>-spencer
>>
>>
>>------------------------------
>>
>>_______________________________________________
>>linux-audio-dev mailing list
>>linux-audio-dev@email-addr-hidden
>>http://music.columbia.edu/mailman/listinfo/linux-audio-dev
>>
>>
>>End of linux-audio-dev Digest, Vol 15, Issue 46
>>***********************************************
Received on Sun Jan 2 20:15:06 2005