You may want to link the output of your SDR software with other signal processing programs. There are at least four methods (and I would be grateful if someone who has used one or more these methods could please expand this sections).
Creating the chain
Physically link the line-out and line-in ports of your sound card
Use the Stereo Mix function of your sound card
Sigi, DJ9BFC notes: Hello eddy ... if you did not tell that answer first ... I would have said similar (use stereo mix). For any application that can use the speaker signal in parallel ... example any packet, SSTV, RTTY whatever software ... then you can use stereo mix (if your system has it available). For any software that works between and NOT in parallel (example any audio filter software like dsp-filter from makito mori) you have to use VAC.
2 different things
- FCD feeds I/Q to SDR software ... audio goes to speaker and in parallel to wsjt ... use stereo mix if available use VAC if not.
- FCD feeds I/Q to SDR ... sound is sent via VAC to dspfilter and then to speaker ... VAC is needed cause the audio stream runs in series and not in parallel.
Sigi notes more possibilities here (but they may require editing the registry and there is little detail). He also notes:
Here are videos showing how to get Stereo Mix added:
Most problematic seems to be Windows Vista ... with a Sigmatel audio card ... but even that can be solved :
On some Windows Vista systems it does not work ... so make a system restore point right before you try that out ... (maybe the guy were it did not work made a fault?).
But I don't have Stereo Mix available on my PC?
Colin VK5HI notes: when I came to find it on my Windows-7 machine I was disappointed that it was not present under Recording in the Control Panel => Sound dialog. Doing a search I found that in some cases it is "hidden" by default, and if that should that be the case try the following:
- From Control Panel => Sound, right mouse click within the dialog, then enable Show Disabled Devices and Show Disconnected Devices.
- A number of devices will be shown in both Playback and Recording. Stereo Mix may be one of them.
- If so, select Stereo Mix => Properties and enable the device.
Use free software
There are a number of free programs which work like the VAC software listed below:
Use the Virtual Audio Cable software
There is Virtual Audio Cable software available which allows the output of one program to feed into another. Here is a screen-shot showing HDSDR feeding MultiPSK.
Examples
Using MAP65 with Linrad for moon-bounce
http://kb5wia.blogspot.co.uk/2013/01/installing-map65-and-funcube-dongle-pro.html
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