An all this time I thought it was the shower.....
Chas
----- Original Message -----
From: "Walter Underwood" <[email protected]>
To: "[email protected] Reflector" <[email protected]>
Sent: Sunday, April 20, 2014 8:42 PM
Subject: Re: [Elecraft] Echo and feedback un SSB
Singers sometimes practice singing right into a corner so they can hear
themselves more accurately.
wunder
On Apr 20, 2014, at 5:19 PM, Jim Brown <[email protected]> wrote:
On 4/20/2014 4:16 PM, Dave Hachadorian wrote:
I can't hear any delay in the K3 monitor, and I am VERY sensitive to
that.
I have the capability to measure it, but I have not done so. If it's
going through any DSP, there will be some, probably a few msec. I would
not expect it to be a problem.
The difference between what we hear through bone conduction and the
actual sound of our voice is mostly the difference in frequency response
between the two paths.
We can get a better approximation of how we sound to others by talking
straight into a hard wall at a very close distance. Now, our ears hear
our voice bouncing off that wall with very little loss.
There's a phenomenon called "precedence effect" that was first documented
by Joseph Henry around 1850 (the guy whose name is on the unit of
inductance in recognition of his inventions involving magnetics much
earlier). Precedence effect describes the characteristic of human hearing
that if we hear the same sound from more than one direction, we will
"hear" it as a single sound, coming from the direction from which it
arrives FIRST even though a later arrival is louder. There's a limit -- a
loudness difference of more than 10 dB will "break" precedence.
Yes, long delayed echoes can make it difficult to talk or to play music.
In live sound reinforcement, delays are produced by DSP, and also by the
time it takes sound to get from speakers over a stage down to the
audience. Delays more than about 35 msec will start causing fatigue or
discomfort, and I've heard very professional announcers slow down and
stop talking with delays in the 80-100 msec range.
73, Jim K9YC
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--
Walter Underwood
[email protected]
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