[Elecraft] Echo and feedback un SSB

[Charlie T, K3ICH]

An all this time I thought it was the shower.....

Chas
----- Original Message ----- 
From: "Walter Underwood" <wunder at wunderwood.org>
To: "Elecraft at mailman.qth.net Reflector" <elecraft at mailman.qth.net>
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 <jim at audiosystemsgroup.com> 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
> wunder at wunderwood.org
>
>
>
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