[hpsdr] No audio with PowerSDR 3.2.19

[Andrew Howell]

Hi John,

     "Is this thing on?" Thats the stupid mistake I made, I think. I 
went back and tried VAC again, selecting speakers at the output. It 
worked. The bone-headed thing I probably did was not raise the volume 
when I first tried it. So now I have audio on the computer speakers, 
which are much better quality than the dinky one I have plugged in the 
radio.

There is  a definite delay, but its slight enough that I have trouble 
working out where is has the greater delay.
I think I'll leave it on the PC speakers until I can get a better one 
for the direct connection.

73, Andy - KF5JLJ

On 10/11/2014 10:15 PM, John Laur wrote:
> Hello, Andy
>
> You do not actually need VAC installed to get audio to play to the PC 
> speakers. Simply select the PC sound card as the output in PowerSDR's 
> VAC setup screen.
>
> PowerSDR's "VAC" feature and the "Virtual Audio Cable" software are 
> completely separate and independent things though they are 
> complimentary when used to route audio to other applications such as 
> digital modes programs like fledge.
>
> However, if you are able to use the radio's native audio input and 
> output I would encourage you to do so. There are a number of 
> advantages including offering lower latency and no danger of buffer 
> overrun/underrun.
>
> My understanding of this is somewhat limited, and not to go too far 
> off topic, but for anyone who did not know this, the actual reason 
> that audio goes back to the radio is because the audio interface is 
> clock-locked to the master 122.88MHz oscillator used for the 
> ADC/DAC.Therefore there is never any clock skew between the 
> incoming/outgoing IQ data and the incoming/outgoing audio. Because of 
> this, the hardware and software can use small, fixed buffers and do 
> not have to worry about the complexity of matching the different clock 
> domains (and the associated problems that would entail) Though I do 
> understand there is some effort being made to address the issue of 
> buffer underflow/undreflow in the VAC interface right now which will 
> be a very welcome change!
>
> 73, John KF5SAB
>
> On Sun, Oct 12, 2014 at 2:44 AM, Andrew Howell <andy at gamubaru.com 
> <mailto:andy at gamubaru.com>> wrote:
>
>     ***** High Performance Software Defined Radio Discussion List *****
>
>     Steve, George and Tim,
>
>     Thanks. I've got VAC installed, but still no audio. I can route
>     the received audio into FLdigi and MixW2 just fine. But directing
>     the output (playback) to the speakers does not work. I'm kind of
>     surprised that PowerSDR doesn't have this all built in.
>
>     Going to the windows control panel I can test the speakers. They
>     work fine. Any ideas?
>
>     Andy KF5JLJ
>
>
>     On 10/11/2014 7:19 AM, AD0ES wrote:
>
>         ***** High Performance Software Defined Radio Discussion List
>         *****
>
>         This is a very detailed description of VAC setup:
>
>         http://kc.flex-radio.com/KnowledgebaseArticle50230.aspx
>
>         Steve AD0ES
>
>         On Oct 11, 2014, at 6:21 AM, George Byrkit wrote:
>
>             ***** High Performance Software Defined Radio Discussion
>             List *****
>             There is, I think, a path within PowerSDR that would use
>             VAC or its equivalent to pipe the
>             received audio around within Windows, but that's
>             'advanced' configuration that I've not
>             done myself.
>
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