Tim,
We recorded on DV using an XL2. If the tapes were messed up, wouldn't it show up prominently in the video? |
Depends what has contaminated the tapes, so to speak. It may not affect the video, don't know.
Since my last post I have done some more playing in the audio editor. If you filter out everything except 4K, then slow the track way down while maintaining the pitch, the sound starts to become familiar. It sounds like a modem communicating. Now at regular speed, it doesn't, it's much higher in speed and frequency. Sort of like what DSL high-speed sounds like. The office scene most likely would have had DSL present in the room ... did the bedroom? Remember, the DSL signal is present on the phone lines whether the computer is on or not. If you had microphone cables laying in proximity to telephone wires then they could have picked up the signal. Anyway, that's all the guesses I have. Been in the audio business a long time and we have a saying ... If it don't work ... it's a cable. After you have checked everything twice and it still don't work ... it's a cable. And when you are sure that every cable and every connection is perfect and it still don't work ... it's a cable. Best of Luck ... Tim |
We have cable at home, not DSL. I do not know which of the two the office had.
Yet your point brings me back to my cell phone hypothesis. That is a form of modem too. I just do not understand how it could affect the signal running through the XLR cables. |
"Pin 1 Error"
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I don't know if your problem is cell phone interference, but if it is, that's almost certainly how it is getting in. If you do a search on pin 1 error you'll find, as I recall, where the original discoverer of this condition uncovered it in some big name microphones. |
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Fascinating... so that means my Audio Technicas are poorly shielded? I will have to try taking a bunch of cell phones and putting them next to my mics some time, to confirm the hypothesis, unless somebody has already tried.
edit: You beat me to it. Great minds think alike! |
It may be cell phones and I'd certainly do the experiment but most of the time cell phone interference is intermittent. The phones 'call home' every few minutes to let the system know where they are but it's not continuous data traffic unless they're actively in use.
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Only a good experiment could determine whether your AT's are poorly shielded.
I once queried AT as to whether my AT3031's might be wired with pin 1 error. Their reply was that they never had a complaint about pin 1 error, but didn't answer my question directly. It would be good to use cell phones of different brands because of their differences. Here's a thread where cell phone interference was discussed, and where Sam Gates very politely enlighten me about pin 1 error: http://www.dvinfo.net/conf/showthrea...ight=pin+error |
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There are two mics running into the same camera.
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it is definately an electronic interference not mechanical sound.
there is a difference in the timing between the two channels too, I mean the two channels were affected with a phase delay but the sequence of the beep is not the same you can check the attachment where the pulse can be clearly seen. amplified by 18db and a low cut at ~200Hz showed this. it was the second clip originaly posted. |
You are right. There is slight phase difference in the sample but the pulses are distinct in each channel.
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That is a great tool Vasilis. What is that plug-in called? That bright line through the display is the horizontal sync from his monitor. But why different pulses in each channel. I am now thinking induction rather than RF. Crazy stuff.
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I'm really confused about the source :-$ |
Cell phone or monitor, right? I'm banking on cell phone; the frequency of the beeping displays a randomness than does not agree with monitors.
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