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Old 24th September 2002, 04:08 PM   #1
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This discussion developed in the "how to design sinx/x filter for TDA1541A?" thread in the digital board and i copied the thread and erased posts not appearing relevant to the new topic.
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Quote:
Originally posted by Jocko Homo
When it causes the cheap op-amp they are using to generate IMD products that fall into the audio band.

Jocko
IMD= Intermodulation Distortion. The occurrence of sum and difference frequencies when two frequencies are amplified in the same amplifier.
Though the frequencies are above the audible audioband the IM products can be in the audible region.
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Old 24th September 2002, 07:36 PM   #2
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Quote:
Originally posted by Jocko Homo
I've tried telling them over and over again. Why do you think they will listen to you instead?
I have no idea Jocko, but it makes you wonder though. We do all sorts of things which may seem weird to others.
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Old 24th September 2002, 07:43 PM   #3
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Default Re: Re: How?

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Originally posted by Elso Kwak
Though the frequencies are above the audible audioband the IM products can be in the audible region.
It's a good rule to reduce HF noise even if your amps don't make it audible. Our surroundings don't like HF noise. Here in Europe it's much stronger regulations for that. For instance, american cordless phones are strictly forbibben here in Sweden. They radiate way too much. Always thrive for a clean audio signal.
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Old 24th September 2002, 08:04 PM   #4
artnyos is offline artnyos  United States
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Default Radiation

A cell phone has to radiate an RF signal to work. It is a radio frequency transmitter/ receiver. Banning American products in Europe is not a technical issue but a trade protectionist issue. You buddies at Ericsson are just trying to protect thier market share. Probably a good idea since they are losing their shirts in the US Telecom market.

Art
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Old 24th September 2002, 10:58 PM   #5
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Default Radiation...........

Yes, indeed, you hear the most outrageous lies about it. Half-baked goggle box do-gooders telling everybody it is bad for you.

Pernicious nonsense! Everyone can stand to have a hundred X-rays a year. And they ought to have them, too.

Thanks to ****** companies like Ericsson, Alcatel, and Marconi, by the time the US telecom industry is set right, I'll be old enough to collect Socialist Insecurity. EC certification amounts to nothing more than a way to screw the country that bailed your butts out of the fire on more than one occasion. And how do they repay us? By leveraged buyouts of our copmpanies, and keeping the rest from selling anything over there.

Right, Arty?

End of rant.

Jocko "Sin Bin Bound" Homo

P. S. See ya' there Ren.........
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Old 25th September 2002, 01:09 AM   #6
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Jocko, if you cut down on the hormone loaded beef and the GM enhanced salad, you might feel less inclined to rant.

ray.
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Old 25th September 2002, 05:07 AM   #7
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I eat neither. Harry is the carnivore. I eat non-GM salad.

Sorry I forgot to put [joke] around everything.

But while I'm at it......has anyone else (excluding Harry.......I've heard his horror stories.....) gone through the frustrating experience of getting a CE sticker for some electronics gear? Seems as though they make up arbitrary rules every time you resubmit it.

Back to the subject at hand.....which was??

Jocko
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Old 25th September 2002, 06:34 AM   #8
sonnya is offline sonnya  Denmark
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yes, but it showed up we could not get that sticker, because we only deliver equipment for bugger machines. So the complete system needed to be checked before you could mount the CE sticker on it.

But then our products needed to be tested to ensure that this would not be where the machines failes!

I do not think the EMC rules are that a big problem. Mostly we call 'Jydsk EMC' to find out which part of the regulations our parts have to comply with. They deliver a good service.

What i think is a problem, is the company's who have certified test labority charge 120USD/man hour. This can get costly!!

Sonny

PS : Try to get CE-sticker on a spot-welder .. they normaly uses a 100KVA weld transformer.
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Old 25th September 2002, 06:54 AM   #9
hifiZen is offline hifiZen  Canada
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Wow Jocko, that's a deep hole you're digging for yourself there... I wonder if the internationals outnumber the Americans on this forum?

Maybe I respect your engineering opinions, but your political ones... ??? I hope you aren't really naive enough to believe that the US doesn't use the very same tactics... actually worse in many cases for leveraging their disproportionate economic and political influence to strong-arm other countries. Well, enough anyway, I won't discuss it further.

So, back to the topic... sinx/x to me automatically means a filter in the digital domain - So doesn't the use of sinx/x filtering imply oversampling? Or am I missing something here... are we really trying to talk about brickwall filters in the analog world which therefore have a causal impulse response?
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Old 25th September 2002, 12:29 PM   #10
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HiFi:

No, just substituting one form of absurdity (non-o/s) with another. Like I said......should have put [joke] in there.

Thought the J. Frank Parnell rant was a clue not to take it seriously. About as serious as all this non-o/s stuff.

So once again......if you guys wants to hear want happens when you try to do digital without a brickwall filter, then go by a used Wadia.

Jocko
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