Hot answers tagged

3

Alhtough this answer should be awarded to Pete, because he has spotted it first. The accelerometer has a sensitivity of 5%, which corresponds to 100[mV/g]. what you are measuring is 0.1[m/s^2], which is about 0.01g. So the actual signal you should be receiving from the piezoelectric accelerometer is about 1[mV], which is quite low. Now, if you see the ...


1

The stereotypical tinfoil hat (or the equivalent) would allow you to create a faraday cage, preventing the signals being sent/received. Of course, it would have to have been done prior to turning it on, or in this case, plugging it in. Why Does Aluminum Foil Block Cell Phone Signals?


1

There's a "rule of thumb" for any phase-sensitive control loop that the processing phase lag has to be less than $\frac{\pi}{4}$ at the frequencies of interest to be stable. For decent noise-cancelling, you'll want to do considerably better than that. I suspect you can find the actual time lag (not phase) for a given product by looking at the ...


1

You can use the following formula to produce the white noise for one cell. = 0.5*NORM.S.INV(RAND()) Where: 0.5 : can change to any non-zero number. It will control the range of the data. NORM.S.INV(RAND()) : produces a random number from -inf to inf, with mean zero and standard deviation 1 you can create a column for noise with this equation, and then just ...


1

Unless the room noise is loud enough to cause physical vibrations in the playback head, leading to misalignment of the head vs. tape track (which could cause crosstalk or amplitude dropoff), there's no way that an acoustic signal can affect the flow of electrons in a wire. BTW, it is true that some LPs show "print-thru," a situation where the ...


1

You are using a piezo electric accelerometer. There are always always always offsets and low frequency noise on a piezoelectric accel. Depending on the charge amp, anything below about 3 hz is meaningless. Just high pass filter the signal to get rid of it. If you need to read below 3 hz then you shouldn't use a piezoelectric. Use mems or piezo resistive in ...


Only top voted, non community-wiki answers of a minimum length are eligible