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New answers tagged noise

How to convert digital value from MEMS microphone to Pa

If nothing @hilmar mentioned in his answer mattered, then, theoretically, You’d need to get your hands on: The microphone’s specs (in particular, the sensitivity). The ADC specs. Then the steps ...
• 6,555

How to convert digital value from MEMS microphone to Pa

You can't. At least not without a phone-specific calibration procedure. Android has too many variables: pre-amps, microphone transfer function & packaging, low lever driver, "enhancements&...
• 46.5k
1 vote

Received signal SNR measurement

The approach I use for these situations is what I refer to as an "all-sample EVM" where I compute the SNR by scaling and delay matching the waveform at a test point in the system with a ...
• 53.1k

Unable to remove audio noise using weak signal power calculated from FFT as threshold

I still do not completely understand the exact mechanism, but using a threshold and zero-out in the frequency domain was a wrong way as explained in Why is it a bad idea to filter by zeroing out FFT ...
• 161
1 vote

Intensity uncertainties in 2D image

There is a concept called ergodicity. If a signal were ergodic you could use one realization of signal to estimate some of its statistical properties otherwise you have to obtain multiple realization ...
• 1,392

How does a quantized signal represent all magnitudes?

An Analog to Digital Converter (ADC) quantizes the input relative to its "full scale voltage". Typically you will need to scale the input signal so it fits reasonably well into range of the ...
• 46.5k
Accepted

How does a quantized signal represent all magnitudes?

You can’t recover, that’s what quantization error is. Because the quantized values $q_1$ and $q_2$ are identical, recovering the exact original amplitude difference between $s_1$ and $s_2$ is ...
• 6,555
1 vote
Accepted

Phase Slope Distance Calcuation

The section from which this figure is taken describes a one-way communication scenario where it was clearly stated that "The Tx sends a CW at each of these 80 subchannels while the Rx ...
• 809

1/ f noise of PSD behavior in Amplitude Spectrum Density

No it would still be 10 dB/decade. When it is a magnitude quantity (as it would be after taking the square root), we use $20\log_{10}(V)$ to compute dB, where $V$ here represents a ratio of voltages. ...
• 53.1k
Accepted

Track data using a digital elevation model (DEM) shows bridges and tunnels as "outliers"

Sounds like a job for a median filter-based anomaly detector followed by linear interpolation: essentially, you slide a "window" of some defined length (widest bridge) over your signal, ...
• 31.8k
1 vote
Accepted

how to identify flicker and RTN noise in a frquency spectrum

Flicker noise has a power spectral density that goes down proportional to frequency offset (so is "1/f noise"), while RTN noise goes down as the square of frequency offset (and is a "...
• 53.1k

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