digital voice recorders
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Kattrina asksed about digital voice recorders. My husband got a little digital voice recorder for $40. It has a varying magnetic field while playing back, that varies with the loudness of the sound. When someone on the playback laughs loudly, the magnetic field goes up to 10 or 15 mG. (I could not check it while recording as it is full and my DH is too busy to deal with it presently.) Generally speaking, battery-operated gizmos are safe for ES people. I have heard of a few cases of people sensitive to the batteries themselves. Meaning, a battery just sitting there, not being used. Presume they must be sensitive to the magnetic field, as I don't know what else it could be. (Marc seems to be sensitive to the slight magnetic field produced by the GS filters. Marc, are you sensitive to batteries?) Some battery-operated gizmos do create RF, of course, and these are not safe. A battery-operated flourescent bulb lantern creates its own RF as this is how fleurescsents operate. I turned on on in a room with a radio on once and the radio just screamed. I had never heard such a noise from a radio! I use a solar-charged LED lantern with no problems at all. I love it. It is bright enough to read by. A battery-operated electric shaver or toothbrush will avoid the RF that one would be exposed to if using a plugged-in unit. There will be a strong magnetic field, though. I used to use a battery-operated rotary tooth brush, but quit because it had a strong m field indeed and I just didn't know what effect that might have on my living body. At any rate, a battery-operated recorder will prevent the RF exposure you'd get with a plugged-in recorder. Also, the magnetic field drops off shasrply just inches away from the recorder. So setting it down rather than holding it or having it around your neck should deal with the magnetic field exposure. Just test the unit before you buy it to be sure you get good sound when the person speaking is the distance away at which you would use the recorder. Regards, Shivani [Non-text portions of this message have been removed] |
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> (Marc seems to be sensitive to the slight magnetic field produced by the
> GS filters. Marc, are you sensitive to batteries?) Not that I've noticed. Even at my worst, I didn't seem to have any problems with the battery-operated remote controls sitting next to me. I sometimes sense that I'm having problems with my battery operated MP3 player that I plug into my car stereo via a cassette adaptor, but I've since come to the conclusion that it is the playback of digitally compressed music that is bothering me, as I've found the symptoms will go away if I increase the bitrate or use an alternate type of compression (constant bitrate MP3 vs. variable bit, etc.) I've read that some people even have this problem with compact discs (compared to old analog records), but I haven't noticed this myself. Marc |
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In reply to this post by SArjuna
"My husband got a little digital voice recorder for $40. It has a
varying magnetic field while playing back, that varies with the loudness of the sound. When someone on the playback laughs loudly, the magnetic field goes up to 10 or 15 mG. (I could not check it while recording as it is full and my DH is too busy to deal with it presently.)" yes - this is simply because the speaker that makes the sound is pushed backwards and forwards by a varying DC current, to produce the sounds, similar to a standard phone, and its how loudspeaker technology works generally, but as its a fairly inconsistant pattern of frequencies (unless you play the same music/voice all the time) then there are probably less damaging effects, if any.. the frequencies are also not all that high or low, 20hz to 20khz on a good hifi system.. Cheers Pete On Sun, 27 Mar 2005 12:49:07 EST, [hidden email] <[hidden email]> wrote: > > > Kattrina asksed about digital voice recorders. > My husband got a little digital voice recorder for $40. It has a > varying magnetic field while playing back, that varies with the loudness of the > sound. When someone on the playback laughs loudly, the magnetic field goes up > to 10 or 15 mG. (I could not check it while recording as it is full and my > DH is too busy to deal with it presently.) > Generally speaking, battery-operated gizmos are safe for ES people. I > have heard of a few cases of people sensitive to the batteries themselves. > Meaning, a battery just sitting there, not being used. Presume they must be > sensitive to the magnetic field, as I don't know what else it could be. > (Marc seems to be sensitive to the slight magnetic field produced by the > GS filters. Marc, are you sensitive to batteries?) > Some battery-operated gizmos do create RF, of course, and these are not > safe. A battery-operated flourescent bulb lantern creates its own RF as this > is how fleurescsents operate. I turned on on in a room with a radio on once > and the radio just screamed. I had never heard such a noise from a radio! > > I use a solar-charged LED lantern with no problems at all. I love it. > It is bright enough to read by. > A battery-operated electric shaver or toothbrush will avoid the RF that > one would be exposed to if using a plugged-in unit. There will be a strong > magnetic field, though. I used to use a battery-operated rotary tooth brush, > but quit because it had a strong m field indeed and I just didn't know what > effect that might have on my living body. > At any rate, a battery-operated recorder will prevent the RF exposure > you'd get with a plugged-in recorder. Also, the magnetic field drops off > shasrply just inches away from the recorder. So setting it down rather than > holding it or having it around your neck should deal with the magnetic field > exposure. Just test the unit before you buy it to be sure you get good sound when > the person speaking is the distance away at which you would use the recorder. > Regards, > Shivani > > [Non-text portions of this message have been removed] > > > > Yahoo! Groups Links > > > > > |
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