[Elecraft] Delay in monitor audio - it aint there!

[Lu Romero]

Interesting article!  Answers a lot of my questions about
the audio processing system.  Thank you so much for the
link!

31 miliseconds... Really?  Wow!

Do you guys consider this a problem?  

Sort of puts the average ATSC compression propagation delay
of roughly 6-10 seconds, depending on bit packing and
statistical multiplexer efficiency in the right context for
all of us, eh?

-lu-w4lt-
K3 #3192



Message: 18
Date: Thu, 21 Jan 2010 16:38:19 -0700
From: Bob Cunnings <bob.cunnings at gmail.com>
Subject: Re: [Elecraft] Delay in monitor audio - it aint
there!
To: elecraft at mailman.qth.net
Message-ID:
   
<d5c86c8d1001211538u7fb01a8dr4237d0a1f6fb77a1 at mail.gmail.com>
Content-Type: text/plain; charset=ISO-8859-1

Here's an interesting piece on K3 transmit audio processing:

http://www.cliftonlaboratories.com/elecraft_k3_speech_processing.htm

where it is reported that "There's 31 milliseconds of
processing delay
in the K3's DSP stages between microphone input and monitor
output..."
using the setup described in the article. The date is 15
March 2009.

Bob NW8L

On Thu, Jan 21, 2010 at 2:53 PM, Lu Romero <lromero at ij.net>
wrote:
> To those of you who were complaining about the delay in
the
> K3 audio monitor chain, I am curious what you are hearing.
>
> After reading the thread, and playing around with the
radio
> for a few days critically listening for this issue, I dont
> hear a problem.
>
> Maybe its a matter of your listening through a sound card
or
> some other external device. ?Or maybe you have external
> digital processing after your microphone. ?However, with a
> microphone plugged in directly (OK, through a microHAM
> MicroKeyerII then into the K3) and my headphones plugged
in
> to the front panel headphone jack, I do not hear any
> discernable delay in the audio feed when listening to
myself
> in the audio monitor of the rig.
>
> And before I get flamed for not knowing what to listen
for,
> Im "learned" in audio delay issues... As a broadcaster, I
> understand audio delay and can see lip sync problems down
to
> around 2 video frames (just ask ABC and Fox TV Network
> Control centers, they probably curse me even today).
> Newspeople have complemented me on my attention to their
> audio delay problems in their IFB and ProChannel feeds for
> years (rare for them, because usually they only talk to
> engineers when things are broken or they want a free tape
> for their resume reel).
>
> Lu Romero - W4LT
> K3 #3192
>
>
>
>
>
>
______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: Elecraft at mailman.qth.net
>
> This list hosted by: http://www.qsl.net
> Please help support this email list:
http://www.qsl.net/donate.html
>