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 <[email protected]> Subject: Re: [Elecraft] Delay in monitor audio - it aint there! To: [email protected] Message-ID: <[email protected]> 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 <[email protected]> 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: [email protected] > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
