John Curl's Blowtorch preamplifier

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#18,661
my diy work
 

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#18,663
Jan wrote: Your hearing apparatus filled in the blanks to the extend that that was pretty much all you 'heard'! Fascinating.
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The opposite can also be shown. Your hearing apparatus can detect sounds without you becoming aware that you heard the sound. This can go so far that you "hear" the same signal sometimes but not all the time, even when listening to the same sample repeatedly. Here is an interesting link to a research article on the so-called "cocktail-party effect" - and yes, the research includes imaging scans of the brain (PET or other): http://www.plosbiology.org/article/info:doi/10.1371/journal.pbio.0060138

From the authors summary: "Sounds that are well above the sensory threshold may sometimes fail to be perceived when they occur amid competing sounds, as often happens in everyday life...."

This gives rise to the assumption that there are limits to listening tests, double blind or not, and in my esteem simple double blind tests are particularly prone to error since they are more likely to rely on rather short "samples". I note that some professionals in the industry seem prefer listening sessions over extended periods of time.
 
#18,674
john curl said:
You bet, I deserve a little appreciation for giving useful ideas away for free.
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I just asked what your VIEW is on open-loop power amps. I'm not asking for a any schematic. Have never seen anything YOU posted in this thread. Have you payed a penny to all those who gave you advice on your recent design problems?? I don't think so. You let others post example topologies and schematics and then either dish it off or run off with their idea. But never mind; I'll find my answers elsewhere!!

Franklin
 
#18,675
Courage, that is childish. First, I politely ignored your question, not wanting to refuse you in print. Then, when confronted with making something compromised without 'hard to get parts', I joked about it. Still, you persist. I know how to make open loop power amps, and my ideas are for sale, if you can afford them. The last time, a schematic cost $5000. Please pay up, or look elsewhere.
 
#18,676
John,

English is not my firts language. There seems to be a misunderstanding about my question which only concerned your current view on open-loop power amps. Not asking for a design, nor schematic!

Since you advocate open-loop it was only logical to ask, but you seem to be upset somehow. I'm neither an engineer, nor a designer. Electronics is just a hobby for me like most here. I'd rather listen to good music than talk endlessly about electronics or designs, because in the end that is all that counts; music.

Now, what kind of design do I get for my $ 5000? Specs please. Just kidding ....

Have a nice day,

Franklin
 
#18,677
MRupp said:


The opposite can also be shown. Your hearing apparatus can detect sounds without you becoming aware that you heard the sound. This can go so far that you "hear" the same signal sometimes but not all the time, even when listening to the same sample repeatedly. Here is an interesting link to a research article on the so-called "cocktail-party effect" - and yes, the research includes imaging scans of the brain (PET or other): http://www.plosbiology.org/article/info:doi/10.1371/journal.pbio.0060138[snip]
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But at a listening test there are no (or should not be) any competing sounds except the ones you're listening at, so I believe this issue does not apply.

The sample size is an interesting subject. We are able to keep about 8 seconds of sound in our memory for direct comparison to another sound. Anything longer and we tend to lose the details. OTOH, people are known to detect subtle features in music only after prolonged listening. Possibly this is a matter of detecting musical features versus detecting audible differences, there may be two different mechanisms at work. Not sure what this means for listening tests, where you are not interested in subtle musical features per se.

Jan Didden
 
#18,679
MRupp said:
The opposite can also be shown. Your hearing apparatus can detect sounds without you becoming aware that you heard the sound. This can go so far that you "hear" the same signal sometimes but not all the time, even when listening to the same sample repeatedly.[snip]
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Once you start to understand how perception works, it sooo simple. Perception brings 'some sensory experience' up to your conciousness. It's the brain that does that, and that brain is fed by external stimuli (signals from your ears, your eyes, your touch, whatever) as well as internal stimuli (remembering things, internal 'body state' signals, expectations, emotions, whatever).

Sometimes the auditory perception you become concious of includes input from the ear, sometimes not. Sometimes the ear input doesn't get through, sometimes the auditive perception gets generated without any ear input.

This is so basic, and indeed saying 'trust your ears' means that you are not aware of these processes.

Jan Didden
 
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