Electrical Engineering Stack Exchange
Electrical Engineering Stack Exchange

Questions tagged [oversampling]

Anything related to oversampling, i.e. the process of sampling a signal at a much higher rate than the minimum required for its reconstruction (a.k.a. the Nyquist rate).

Anything related to oversampling, i.e. the process of sampling a signal at a much higher rate than the minimum required for its reconstruction (a.k.a. the Nyquist rate).

See also Wikipedia on oversampling.

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Fast Fourier Transformation of incomplete signals

I would like to perform a FFT on a signal with equally sampled values of which some are missing. (Actually, they are not even missing, but simply erroneous, so I can't use them, but I can detect when I have a wrong samplepoint.) Is there a way to…
DonQuiKong
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About the meaning of "oversampling"

Recently, I heard one of my colleague said "the 16-bits ADC is enough for us, we can use 'oversampling' tech...". Finally I figured out his "oversampling tech" means to sample many many cycles (AC sampling). But I wonder if we don't improve the…
diverger
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ADC driver design for oversampling

I'm interested to sample an AC signal in the range of 5kHz - 20KHz with the STM32L432KC microcontroller. This microcontroller has a hardware oversampling feature, i.e it can take the average of several ADC samples without CPU overhead, increasing…
sled
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Calculating FFT for only part of full frequency range?

Earlier I asked a question here about performing FFT at lower frequencies but still at high sample frequencies. I was under the impression that the FFT was inherently calculated at every frequency 0->(Sampling Frequency)/2 distributed in bins of…
Scorch
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How to extract ENOB from LTSpice simulation and see the effects of oversampling?

I have a fully differential instrumentation amplifier circuit with a gain of 536 to map a 3mVpp signal (centred around 1.65V) to +/-1.6V, as shown here. My signal bandwidth is 250Hz, and I would like to use a 12bit differential ADC (stm32g491) with…
davidanderle
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Is it possible to increase the ENOB by oversampling and averaging the readings of an external ADC IC?

I want to connect a 4-wire PT100 sensor to a MAX31865 RTD-to-digital converter. The MAX31865 has a resolution of 15 bit, however I need a resolution of 17 bit. Will I be able to use the oversampling and averaging principle (AN118) to gain 2…
Velvel
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UART oversampling

I've read that for UART is over sampling used to recover some kind of “clock signal”. How is that exactly done and why is that needed? I already searched on the internet, but I didn't find any helpful information.
bilaljo
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May I write to a DAC chip slower than data is "sampled" at?

Will a DAC chip like MCP4921/4922 UDA1334ATS output at a higher rate than the samples are written to it? Like 16 kHz sampled data out (to the headset) but the processor just delivering new values at 8 or 4 or even any frequency? I don't think that…
Øyvind Teig
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Calculating bits/sample from a digital MEMS microphone

I'm thinking of using a digital MEMS microphone in a project - looks like it would save on some parts: no need for an amplifier and ADC. The output from the microphone is PDM and I'd need to convert it PCM for any useful processing. Say I'd like to…
jmw
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Using strategic sampling noise to increase sampling resolution

Dithering is used to add virtual resolution to an oversampling ADC, and for instance this discussion involves some of the math involved, and the criteria. Take for instance an Arduino with 10 bit sampling. The unit has is the ability to set a…
J Collins
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Increasing SNR through sampling and coherent integration

Let's say I have simple BPSK scheme and a receiver RF stage such that I have an ideal analogue bandpass filter with bandwidth \$ f_{bw} \$ and then a down converter and finally a sampler. I am trying to use oversampling so that I can integrate the…
Tunç Arslan
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Does SNR improve at higher sampling rates for a low pass filtered signal?

Let's say we want to extract 1Hz signal from a noisy signal by using a LPF. And assume we have sampled it with 100Hz sampling rate. If we would have sampled it with 1kHz sampling rate and use the same LPF would the SNR be better? Why?
floppy380
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RF over sampling to increase SNR

Using a 32MHz pic processor, and over sampling the demodulated analog output of an RF receiver (instead of the data slicer output) is it possible to use averaging to reduce increase the SNR of the system? The data is NRZ OOK at 4.5kHz. Update I…
Lance Beasley
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Am I getting DC bandwidth correctly?

I am computing Johnson and shot noise in a DC circuit, where I have an Arduino Due sampling with "delay(100);", i.e. at 10Hz. Sampling rate and bandwidth follow Nyquist sampling theorem. According to this theorem, the sampling rate should be at…
Dave
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Any tricks to generate triangle wave to add to analog signal for oversampling?

I want to increase the effective resolution of the ADC by oversampling and decimation. Unfortunately the signal I'm realing is too clean, so I would like to add a bit of artificial noise (1LSB peak to peak) to a signal. I would like to use MCU timer…
miceuz
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