[hpsdr] No audio with PowerSDR 3.2.19

[John Laur]

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> 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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