DRM Software Radio Forums  

Go Back   DRM Software Radio Forums > DRM Software Radio - User Forums > General Topics
User Name
Password
FAQ Members List Calendar Search Today's Posts Mark Forums Read

Reply
 
Thread Tools Search this Thread Display Modes
Old 25-09-2004, 22:18   #61
VE3MEO
Registered User
 
Join Date: Oct 2002
Location: Cobourg, Canada
Posts: 289
Re: Selectable Input supports two receivers with one sound card

Quote:
Originally posted by VE3MEO
The latest 1.1.1cvs now has a command line parameter with which you can select the input channel to be decoded:
-c , where = 0, left channel
1, right channel
2, mix of both channels (the default).


Should read:
-c (n), where (n) = 0, left channel
1, right channel
2, mix of both channels (the default).

In the prev post, the n was enclosed in greater than/less than symbols that were interpreted as html tags and undisplayed.

Tom
VE3MEO is offline   Reply With Quote
Old 25-09-2004, 22:33   #62
dk8cb
Roland
 
Join Date: Mar 2004
Location: Munich, Germany
Posts: 2,748
Re: Selectable Input supports two receivers with one sound card

Quote:
Originally posted by VE3MEO
Unfortunately, the audio output from each is fed to both output channels so you cannot use cocktail party effect to discriminate between their respective programs. It would be nice to have control over output routing, too.

Hi Tom,

this could easily be done, but how about stereo transmissions?


Roland
dk8cb is offline   Reply With Quote
Old 26-09-2004, 03:26   #63
VE3MEO
Registered User
 
Join Date: Oct 2002
Location: Cobourg, Canada
Posts: 289
Re: Re: Selectable Input supports two receivers with one sound card

Quote:
Originally posted by dk8cb


Hi Tom,

this could easily be done, but how about stereo transmissions?


Roland

Hi Roland,

The ideal output routing solution would allow the following:

Input Mode Output
dual mono equal left/right
dual stereo stereo left/right
single mono equal left/right
single mono same output chan as input (left-left, right-right)
single stereo stereo left/right
single stereo mono sum to same output chan as input

That would allow a stereo program to be monitored in stereo while another program is being logged and it would permit two stereo or mono programs to be monitored in mono with the spatial separation of the speakers to aid discrimination.

Another idea would be a diversity switch so that only one audio is output, whichever one is not muted due to MSC error, remaining on it until the combination requires a change. Thus with two receivers and antennas, one could achieve some overall improvement in the %audio decoded.

What do you think? Is any of this do-able?

73, Tom
VE3MEO is offline   Reply With Quote
Old 26-09-2004, 15:16   #64
dk8cb
Roland
 
Join Date: Mar 2004
Location: Munich, Germany
Posts: 2,748
Re: Re: Re: Selectable Input supports two receivers with one sound card

Quote:
Originally posted by VE3MEO
What do you think? Is any of this do-able?

Hi Tom,

it could certainly be done. It would require a few more command line switches and perhaps a new audio output class.
The only question is, whether someone who has got the time to do it will consider it worth doing.

Roland
dk8cb is offline   Reply With Quote
Old 26-09-2004, 18:00   #65
df9rb
Registered User
 
Join Date: Jun 2004
Location: 150 km north of Munich
Posts: 484
Moved to Receiver modification

Last edited by df9rb : 28-09-2004 at 18:02.
df9rb is offline   Reply With Quote
Old 27-09-2004, 20:17   #66
dk8cb
Roland
 
Join Date: Mar 2004
Location: Munich, Germany
Posts: 2,748
Re: Re: Re: Selectable Input supports two receivers with one sound card

Quote:
Originally posted by VE3MEO
What do you think? Is any of this do-able?

I just found out that Volker has already done it. It's in the CVS.

As fast as lightning!

Roland
dk8cb is offline   Reply With Quote
Old 28-09-2004, 03:14   #67
VE3MEO
Registered User
 
Join Date: Oct 2002
Location: Cobourg, Canada
Posts: 289
Re: Re: Re: Re: Selectable Input supports two receivers with one sound card

Quote:
Originally posted by dk8cb


I just found out that Volker has already done it. It's in the CVS.

As fast as lightning!

Roland

You're kidding! I have got to get Visual C++ 6 and get into this compiling and customising. But there's so much to learn - to start I have yet to figure out what to look for in CVS!

Tom
VE3MEO is offline   Reply With Quote
Old 28-09-2004, 08:24   #68
dk8cb
Roland
 
Join Date: Mar 2004
Location: Munich, Germany
Posts: 2,748
Re: Re: Re: Re: Re: Selectable Input supports two receivers with one sound card

Quote:
Originally posted by VE3MEO
You're kidding! ... to start I have yet to figure out what to look for in CVS!
Hi Tom,

if you look at eg .../common/Data.cpp you will find:

-------------------
switch (eOutChanSel)
...
case CS_BOTH_BOTH:
/* left -> left, right -> right */
...
case CS_LEFT_LEFT:
/* left muted, right -> right */
...
case CS_RIGHT_RIGHT:
/* left muted, right -> right */
...
case CS_LEFT_MIX:
/* left -> mix, right muted */
...
case CS_RIGHT_MIX:
/* left muted, right -> mix */
-------------------

This is a little different from what you wanted, but it will do the same job, ie "/* left muted, right -> right */" would mean that the left channel from the demodulated audio signal is muted (no problem with mono signals) and that the right audio channel is sent out to the right output.

73, Roland

Last edited by dk8cb : 28-09-2004 at 08:33.
dk8cb is offline   Reply With Quote
Old 28-09-2004, 08:50   #69
DigiBC
Registered User
 
Join Date: May 2003
Location: near Cologne, Germany (5100'N / 649'E)
Posts: 36
... and here are the appropriate command line arguments to start Dream with:
Code:
-u 0 or --outchansel 0 L -> L, R -> R (default) -u 1 or --outchansel 1 L -> L, R muted -u 2 or --outchansel 2 L muted, R -> R -u 3 or --outchansel 3 mix -> L, R muted -u 4 or --outchansel 4 L muted, mix -> R
Regards - DigiBC
DigiBC is offline   Reply With Quote
Old 28-09-2004, 18:12   #70
VE3MEO
Registered User
 
Join Date: Oct 2002
Location: Cobourg, Canada
Posts: 289
Quote:
Originally posted by DigiBC
... and here are the appropriate command line arguments to start Dream with:
{snip}
Regards - DigiBC

You guys (Roland & DigiBC) are most helpful. It was only a few days ago that my helpful compiler included a help.bat file from which I learned that the list of command line prompts could be seen using a command line prompt, i.e., "dream.exe -h". Amazing! Why didn't I think of that?

73, Tom
VE3MEO is offline   Reply With Quote
Old 30-09-2004, 02:25   #71
VE3MEO
Registered User
 
Join Date: Oct 2002
Location: Cobourg, Canada
Posts: 289
Thumbs up Dual receivers, routable outputs, single sound card!

Thanks to my friendly compiler, I am now running the latest (well maybe 72 hours old) 1.1.1cvs with my two DX-394's and their down converters. One is tuned to CRI on CBC 6140 coming out the left speaker (is that appropriate?) and the other tuned to DW Wertachtal 3995, waiting for a blip of decoding to break through on the right speaker. A little earlier, they were both on 6140; the time delay echo between the two decoders is a little more tolerable when they come out of separate speakers than out of the same speakers. And a slight shift of the Volume balance control favours one or the other.

Volker, it works great!

Next, I need to get a second antenna working, oriented orthogonally to my G5RV so that a crude diversity receiving system could be tried.

Then it would be neat to come up with an audio process to pass only one channel when both are outputting audio and switch away from the muted one to the active one when only one is decoding. Could be done in hardware but it's probably a piece of cake in software.

A hurdle to overcome is the timing difference of the two decoders. The decoder delay seems to vary depending on when decoding begins. Perhaps it's related to where it starts in the MPEG frame or something to do with interleaving.

I am so impressed with how rapidly the DReaM developers adopt suggestions, especially mine! I think I have triggered 3 now - group delay plot, dual inputs to one sound card, selectable output routing from 1 sound card. And in the brief period I have been a user, there have been so many more improvements. Awesome.

73, Tom
VE3MEO is offline   Reply With Quote
Old 30-09-2004, 13:51   #72
GuidoS
Registered User
 
GuidoS's Avatar
 
Join Date: May 2004
Location: Antwerp-Belgium
Posts: 14
Re: Dual receivers, routable outputs, single sound card!

Quote:
[i]I am so impressed with how rapidly the DReaM developers adopt suggestions
73, Tom [/b]

Some months ago there was a discussion going on about the advantages of Dream compared to the FhG software. The conclusion was that you need both.

I am wondering if this is still the case ?
__________________
Kind regards,

Guido Schotmans.
GuidoS is offline   Reply With Quote
Old 25-10-2004, 11:42   #73
rad
Registered User
 
Join Date: Oct 2002
Location: Greenwich, England
Posts: 9
I know what you mean, for features DREAM is better, but actually the FHG software is just nice and simple and has a better designed GUI. Dream requires too many windows. The green oscilloscope thing on the FHG software looks better too. Perhaps DREAM should become "skinnable".


The initial DREAM window is a waste of space. Who needs a whole window to tell you what station you are listening to. It could be much more compact.
rad is offline   Reply With Quote
Old 25-10-2004, 13:37   #74
dk8cb
Roland
 
Join Date: Mar 2004
Location: Munich, Germany
Posts: 2,748
Hi,

if you want a green spectrum scope on Dream, you can have it. There is already a start parameter for it. Just start "dream.exe -h" and you will find it.

However, I really prefer the blue spectrum plot.

Roland
dk8cb is offline   Reply With Quote
Old 25-10-2004, 14:27   #75
cesco
Registered User
 
Join Date: May 2004
Posts: 11
I think its not aout blue or green in the spectrum scope.

Those unfiltered values in log sacale jump around a lot,
that is the problem.

I think a linear scale, filtered display looks much better
and makes it easy to identify the freq pilots.

with "filter" i mean to display the sum of the last 5
measurements, and, a linear display may need a sort
of AGC.
cesco is offline   Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is Off
HTML code is On
Forum Jump


All times are GMT. The time now is 19:39.


Powered by vBulletin Version 3.5.3
Copyright ©2000 - 2019, Jelsoft Enterprises Ltd.