Re: Sony VAIO laptop 'soundmodem' troubles

["Luc Langehegermann" <luc@lx2gt.lu>]

Hello John,

Under ALSA the devices have different names!

hw:0 (first soundcard)
hw:1 (second soundcard)

or:

plughw:0
plughw:1

The difference if, with plughw ALSA tried to do sample rate conversion /
format conversion / channel conversion.

sample rate conversion is a very bad idea, if you use soundmodem.

/dev/dsp* under also will alsways do the conversions, unless you turn them
off! Take a look at http://www.alsa-project.org/~iwai/OSS-Emulation.html

73, Luc, LX2GT


----- Original Message ----- 
From: "John Mock" <kd6pag@qsl.net>
To: <linux-hams@vger.kernel.org>
Sent: Saturday, July 24, 2004 9:58 PM
Subject: Sony VAIO laptop 'soundmodem' troubles


> I'm trying to get 9.6kb packet running either on a PowerMac 8500 (with
> G3 upgrade) or Sony VAIO R505EL (P-III), preferably both.  I'm stuck on
> either at the moment.  Here's the Sony problem.
>
> On the VAIO machine, 'multimon' decodes APRS packets at 1.2kb AFSK from
> either of my HT's directly connected to the 'Mic' input.
'soundmodemconfig'
> shows similar waveforms to 'multimon' but gets gibberish for APRS packets
> in 'soundcard' [non-ALSA] mode.
>
> Thus far, i have not found anyone transmitting 9.6kb packet locally, and
> attempts to receive a couple of different satellites so far as not gotten
> any packets at 9.6 kb using 'multimon'.  (I have not yet tried 9.6kb with
> 'soundmodem'.)
>
> I looked into the LINUX-Hams archives, and note that others have not had
> an easy time getting the AC97 codec to work properly.  I picked up a copy
> of experimental version of 'soundmodem' with native ALSA code mentioned in
> June of this year.  Forcing the AFSK sample rate to either 22050 Hz or
> 48000 Hz in 'soundcard' mode does not seem to change anything (c.f. the
> discussion of similar problem[s] here in March of this year).  Trying to
> use native ALSA mode shows a dialog box "Cannot start audio I/O" and the
> message
>
>     ALSA lib pcm.c:1972:(snd_pcm_open_noupdate) Unknown PCM /dev/dsp
>
> A copy of '/etc/ax25/soundmodem.conf' and the full error log are attached
> below.  I am running a vanilla LINUX 2.6.7 [.config posted upon request]
> and the 'unstable' branch of Debian LINUX.
>
> Any idea what might be wrong with 'soundmodem' at 1.2 kb AFSK and/or with
> 'multimon' at 9.6kb FSK?  (Of course, fixing 'multimon' is really only a
> temporary fix, as i want to make packet work properly.)
>
> Thank you for your patience and assistance.
>
>          -- KD6PAG  (Networking Old-Timer, Satellite QRPer)
>
>
> [Note: I never send unsolicited binary attachments and if you receive
anything
> purportedly from <kd6pag@qsl.net> that isn't signed with my callsign, then
it
> probably isn't from me.]
>
> --------------------------------------------------------------------------
-----
> <?xml version="1.0"?>
> <modem>
>   <configuration name="vaio">
>     <chaccess txdelay="150" slottime="100" ppersist="40" fulldup="0"
txtail="10"/>
>     <audio type="alsa" device="/dev/dsp" halfdup="0" file="" repeat="0"
simchan="0 - Ideal channel" snr="10" snrmode="0 - White Gaussian" srate="0"
capturechannelmode="Mono"/>
>     <ptt file="none"/>
>     <channel name="Channel 0">
>       <mod mode="afsk" bps="1200" f0="1200" f1="2200" diffenc="1"/>
>       <demod mode="afsk" bps="1200" f0="1200" f1="2200" diffdec="1"/>
>       <pkt mode="MKISS" ifname="sm0" hwaddr="KD6PAG-1" ip="44.4.28.42"
netmask="255.255.255.0" broadcast="44.4.28.255"/>
>     </channel>
>     <channel name="Channel 1">
>       <mod mode="fsk" bps="9600" f0="1200" f1="2200"/>
>       <demod mode="fsk" bps="9600"/>
>       <pkt mode="MKISS" ifname="sm1" hwaddr="KD6PAG-2" ip="44.4.28.42"
netmask="255.255.255.0" broadcast="44.4.28.255"/>
>     </channel>
>   </configuration>
> </modem>
> --------------------------------------------------------------------------
-----
> VAIO 505> ./soundmodemconfig
> config_select: cfg: vaio  chan: -
> selection: cfg: vaio  chan: -
> config_deselect: cfg: vaio  chan: -
> channel_select: cfg: vaio  chan: Channel 0
> selection: cfg: vaio  chan: Channel 0
> Modulator: afsk Demodulator: afsk
> Modulator: parameter bps value 1200
> Modulator: parameter f0 value 1200
> Modulator: parameter f1 value 2200
> Modulator: parameter diffenc value 1
> Demodulator: parameter bps value 1200
> Demodulator: parameter f0 value 1200
> Demodulator: parameter f1 value 2200
> Demodulator: parameter diffdec value 1
> Minimum sampling rate: 9600
> Audio IO: type alsa
> ALSA lib pcm.c:1972:(snd_pcm_open_noupdate) Unknown PCM /dev/dsp
> sm[3419]: alsa: Error opening PCM device /dev/dsp
>
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