[Elecraft] [K3] VOX on the K3 - Smooth Voice Controller

[Wright, Robert]

Ray,

Right, but you'd never be aware of the delay unless the monitor was turned on.

73, Bob N7ZO


-----Original Message-----
From: Ray Sills [mailto:raysills3 at verizon.net] 
Sent: Thursday, February 21, 2013 11:57 AM
To: Wright, Robert
Subject: Re: [Elecraft] [K3] VOX on the K3 - Smooth Voice Controller

Hi Bob:

I don't know what the delay interval is... but remember: sound travels about 1000 feet per second, so a 1 millisecond delay is what you encounter when the sound source is 1 foot from you.  85 milliseconds is what you would experience from a source 85 feet away.
Most of the time, we are not bothered by delays of 30 milliseconds or less.

73 de Ray
K2ULR

On Feb 21, 2013, at 12:35 PM, Wright, Robert wrote:

> Eric,
>
> Interesting and neat.  I should have expected you were already on top 
> of this.  :-)
>
> I just went back to the K3 and played with it a bit.  Just by 
> listening, the monitor delay seems to be the same whether I have VOX 
> enabled or not.  This is just the normal acceptable delay I have come 
> to expect in the K3's monitor.
>
> The Smooth Voice Controller had a nominal 85mSec delay (QST article 
> April 1992 pg. 42) and, if I recall correctly, seemed much more 
> noticeable than what I am hearing in the K3.  Eric, can you comment on 
> the amount of delay used for the K3 VOXing? (Saves me setting up
> for a measurement.)   Does the monitor come before that delay?  Am I  
> hearing, in the monitor, what is being transmitted (relative to the 
> PTT-voice timing and first syllable cut-off)?
>
> Thanks, Bob N7ZO
>
>
> -----Original Message-----
> From: Eric Swartz - WA6HHQ, Elecraft [mailto:eric at elecraft.com]
> Sent: Thursday, February 21, 2013 8:49 AM
> To: Wright, Robert
> Cc: elecraft at mailman.qth.net
> Subject: Re: [Elecraft] [K3] VOX on the K3 - Smooth Voice Controller
>
> This is -exactly- what we do in the DSP for the K3's VOX to eliminate 
> any cutting off of the first syllable. You can talk normally without 
> that 'Ahh' at the beginning of sentences to avoid loss of info ;-)
>
> 73,
>
> Eric
> elecraft.com
>
> On 2/21/2013 8:07 AM, Wright, Robert wrote:
>> I used to have a box from A&A Engineering called a Smooth Voice  
>> Controller.  It was a VOXer with a short audio delay line (bucket  
>> brigade IC) to allow the PTT to get to the radio before your first  
>> syllable.  The result was no clipping at the beginning of each  
>> phrase.  The only downside was that monitoring yourself with  
>> headphones was tricky with the delay.  But the VOX results were  
>> very good.
>>
>> I've always thought that this concept would be a great improvement  
>> to the K3's VOX and could be done readily in the DSP.  It could be  
>> a menu setting with the voice delay variable from 0 (normal  
>> operation) to some fixed amount.  It would only need to be enabled  
>> when VOX was on.
>>
>> 73, Bob N7ZO