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Noise reduction -why the rage now ?

Is it better science ? Or more needed today with the ’surge’ of switching power supplies, smart phones and Wi-Fi routers ? Then, higher-frequencies in digital interfaces -now megahertz and gigahertz.

The problem with the "needed more today" theory is that one, listeners are hearing things they never heard before. One report is from Paul of PS Audio (on his blog) stating that a 4K power cord transformed his system. Yet he sells a Power Plant.

Two, many reports of lower noise (in the last 10 years) were in systems with linear power supplies, not switch-mode.

Three, for digital, many people were using AES/EBU or i-squared interfaces. These don’t have the noise concerns of USB.

Fourth, many people listen at night. They know better, due to the problems of a noisy day-grid.

Yet, there it is -large gains from the latest power conditioners, ground blocks and after-market power cords. To me, today’s science is much better at doing this. Along with the "need today".
jonnie22
geoffkait's avatar
geoffkait
23,365 posts
 
millercarbon
When in fact the worst kind of noise is the sort that gets interwoven right into the signal.

>>>>>Gee, you don’t say? Why, it almost sounds like you think the signal is the audio waveform. What is this signal you speak of? 
jonnie22 OP
42 posts
 
Here is something very interesting. We DON'T KNOW if noise is worse in recent decades, at least with RF.

I can’t seem to add the URL, so type:
"electronic noise is drowning out the internet of things ieee.org"




geoffkait's avatar
geoffkait
23,365 posts
 

Huh? The article you linked actually states the RF problem is getting worse. To whit,

“Nevertheless, the RF noise problem is increasing. Although most devices pollute less than their predecessors, we have far more of those devices. Other sources, such as the power grid, are expanding as wind farms and solar households connect to it. Such devices need to switch large amounts of DC power at a 60-hertz or an even faster rate whenever they feed excess generated power back into the grid. If not done properly, this could also feed large amounts of noise into the power grid. This risk is magnified when the solar and wind systems operate without expert maintenance inside millions of ordinary homes.”


jonnie22 OP
42 posts
 
You didn’t read the whole article. "The bottom line is no-one really knows whether outdoor noise has increased or decreased in recent years. And the same goes for measurements made indoors."

Later says "the needed data is almost totally missing".

Yes, it says power tools and electric-toothbrushes are noisy but this obviously doesn’t affect the audiophile. Then, in a graph, it shows how "noise drops as frequency rises". And that’s just where consumer electronics is going today - ever-higher frequencies...
geoffkait's avatar
geoffkait
23,365 posts
 
The number of cellphones, tablets, TVs and wireless networks has dramatically increased in the last 40 years. Plus the number of RF producing microchips in audio components have increased dramatically. You don’t have to be a rocket scientist to figure it out. RF is by definition high frequency. Hel-loo!
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