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a.saji
User Rank
Silver
Re: Digital?
a.saji   2/20/2014 4:49:32 AM
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@zeeglen: Good point but I feel its good to try out all that is available so at least we can figure out the issues behind them and start addressing them. Who knows the output can be THE one in the future.    

zeeglen
User Rank
Gold
Digital?
zeeglen   2/20/2014 1:44:23 AM
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Reminds me of a sine wave generator using a complicated counter/prom/DAC instead of a simple Wien Bridge oscillator.  Really, is this any better than a back-biased zener (white noise genertor) and audio amplifier?

Rob Spiegel
User Rank
Blogger
Re: Embrace the noise
Rob Spiegel   9/9/2013 8:14:35 PM
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This is a good story, Andy. Could you expand on it a bit and submit it as a Sherlock Ohms post?

armorris
User Rank
Platinum
Random number generator
armorris   9/7/2013 1:18:21 PM
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I used the same technique that Mr. Grill did to generate pseudo-random numbers for a PIC program I wrote once. I copied a random noise generator off the web, like Mr. Grill did and like him, I wrote software code to emulate the function of the hardware. The main program would just look at the number in one of the registers to get a "random" number. I only needed an 8-bit random number, but 16 bits would have been available, had I implemented all 16 bits. There is probably no limit to how many bits you can do with this technique.

Great job, William. Comments in your code would be helpful, however.

armorris
User Rank
Platinum
Re: Embrace the noise
armorris   9/7/2013 10:33:54 AM
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When I was in the Mormon Church many years ago, there was white noise piped to speakers in the hallway, so that one could not listen in on conversations in the classrooms or offices. One day lightning damaged the sound system. The amplifier system was in a closet and consisted of several 100W power amplifier modules, a white noise generator, preamplifier and power supply. The sanctuary volume was remotely controlled from the stage. The power amplifier that powered the sanctuary speakers was damaged by lightning, and I temporarily replaced it with the masking system amplifier which was identical to it, but set to a much lower level. I repaired the power amplifier and being identical to the others, I plugged it into the masking amplifier slot. I forgot to turn the gain down and when I turned the system on, it sounded like the space shuttle was being launched from our church hallway.

Until called upon to repair the sound system, I just thought that the soft rushing sound I heard in the hallway was the air conditioning. Until then, I had never even heard of a masking system.

Cabe Atwell
User Rank
Blogger
Re: Embrace the noise
Cabe Atwell   8/27/2013 2:35:24 PM
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That's an interesting device. Good write-up William.

 

Just need a better speaker system now...

Rob Spiegel
User Rank
Blogger
Re: Embrace the noise
Rob Spiegel   8/26/2013 1:29:15 PM
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Wow. I knew that white noise worked, but I doidn't know it was being deployed in specific professional settings.

William K.
User Rank
Platinum
Re: Embrace the noise
William K.   8/26/2013 11:58:22 AM
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I also find noise iritating, especially when it is added to mask other sounds. 

The most offensive noise, though, has been added to a local food establishment to simulate the sounds of a crowd having a good time. My meal companions had not noticed it until I pointed out that none of the other patrons were being that noisey, and as they looked around they realized that it was true, others were quietly talking in their own booths, while the ambient din was much louder than that. This is especially bothersome to me because I have damaged hearing, and the increase in ambient noise tends to make having a conversation difficult.

But even worse than that is the background "music" played in both offices and some stores. This is never the good quality stuff, but rather the stuff that is available much cheaper because nobody liked it. ( I am referring to the copyright fees). That garbage, played through paging trumpet speakers, is quite offensive to my ears.

1800ES
User Rank
Gold
Re: Embrace the noise
1800ES   8/26/2013 8:54:26 AM
NO RATINGS
Hi modorney,

You're looking for a pager motor or one of it's derivatives.  Here's a link, I can't be responsible for any collateral damage to your bank balance (:-) they've got a LOT of goodies!):

http://www.goldmine-elec-products.com/products.asp?dept=1107

Looking forward to seeing your project!

modorney
User Rank
Iron
Re: Embrace the noise
modorney   8/25/2013 4:35:19 PM
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I hear what everyone says about the pluses and minuses of white noise.  Some like it, while some don't.

 

Here's an odd, somewhat off topic question.  I work in a noisy environment, and need a timer that would normally beep.  I have to look out the window, so I can't look at the timer, so I need something that "bumps" - like a vibrator that vibrates once.  Some cell phones have this when you turn them on - you hold the on button for three seconds, and you feel them "jump".  

 

What is this component called.  I've searched "thumpers" (and learned a new game), and searched "vibrators" (and got some interesting stuff).  

 

This device must have a name?  

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