Tarv, I listened to/watched the video, and have a couple of ideas.
The first is the DCS camera microphone is high gain and/or quite sensitive. I can hear a very slight electrical noise in the background when I look at my cameras (on a b/g router) if I crank up the volume on the computer. Frankly I just attributed what I hear to a hollow kind of sound in a large area. Whatever it is, it sounds somewhat the same as what I hear on your video. The noise could just be generated within the camera from a high-gain amplifier circuit with insufficient filtering or shielding. (If you remember super-regenerative receivers, they would break into oscillation if the gain was turned up.) You might run an experiment in muffling the microphone with, say, cotton and ensuring the room is totally quiet (I have not tried this).
The second idea is that you may have multiple devices on the same wireless network channel or range of frequencies. It could be almost anything else in your house or a neighbor's house (depending upon how close they are). Something continuously generating noise could be (a) cordless telephone(s) syncing with a base, a switching power supply in something instant-on (TV?), a computer monitor or power supply, a dimmer switch, a touch lamp, or electronic control circuitry such as I had a problem with in an older heat pump since replaced.
If you have a UPS or two, or a laptop, you might trying turning off the main breaker in the house. (We occasionally have power disruptions or outages and I use a UPS to keep the router, telephone and cameras running for up to three hours.) If the noise goes away, then you'll know its source is internal to your abode. Then you can investigate each circuit, one at a time, and narrow down the source.
The third idea is more of a question. I have cable TV, and I notice that when I carry an portable AM radio near any of the DVR/HD boxes, there is interference whether or not the cable boxes are turned on or off. On my VHF/UHF amateur radio transceivers, I find many spurious cable signals throughout the 144 and 440 MHz bands, and there are annoying harmonics through the 800 and 900 MHz police and utility frequencies. Reception improves immediately if I unplug the cable boxes from the electrical outlets. Theoretically one could get the FCC and or the state's board of public utilities to make the cable company clean up its network leakage, but in this budgetary and political environment that it less likely than me winning a national or state lottery.
Hope this helps.
Tom
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Topic: Sound distortion on DCS-1130 when using wireless (Read 11341 times)