Questions tagged [sampling]
The sampling tag has no usage guidance.
0
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1answer
24 views
First-order hold interpolation in matlab
I have a sinusoidal signal x(t) sampled with period 1/fs. The result is the discrete signal x[n], where x[n]=x(t)|t=nT. Then I perform an upsampling of factor, let's say, 8 to increase the sampling ...
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2answers
75 views
increase the ADC resolution using oversampling [duplicate]
To increase the ADC resolution, oversampling technique can be used which must be followed by decimation (average) method.
Oversampling is just take several samples within time period. Unlike the ...
12
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6answers
2k views
Why does increasing the sampling rate make implementing an anti-aliasing filter easier?
From an answer to a question regarding sampling rate and anti-aliasing filter I read the following:
The closer you get to the theoretical minimum sample rate, the more
difficult the analog filter ...
0
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3answers
64 views
Fastest temperature sensor for a bimetallic strip
What is the best approach or sensor to analyze the temperature of a bimetallic strip?
From experimental data, the temperature swings due to a current flowing into the bimetal, are up to 80°C in a ...
0
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2answers
130 views
New Amazon music streaming service and Nyquist sampling theorem [closed]
I read this story on The Verge the other day,
“It’s a better bitrate, better than CD quality,” said one of MBW’s sources, indicating the new service will put Amazon in direct competition with Tidal’...
0
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1answer
22 views
Input voltage on differential ADC (MCP33131D-05-E/MS)
I am evaluating a 16bit ADC (MCP33131D-05-E/MS) for my project. I want to sample in fully differential mode, but I have doubts as to what voltages are allowed on the Ain+ and Ain-.
Signal ...
0
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1answer
65 views
Calculating sampling frequency off of estimated stop band attenuation
I'm trying to calculate what I will have to set my microcontroller's ADC sampling rate at in order to sample a band of 500kHz to 1.6065MHz without aliasing. Some constraints here are that I have to ...
3
votes
4answers
772 views
Is there an efficient way for synchronising audio events real-time with LEDs using an MCU?
I'm working on a project in which LED lights synchronise with audio events. I'm not referring to reactive LED projects that read the ADC from audio amplitude or spectrum, but about having some ...
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0answers
16 views
Data synchronization strategy for multiple sensors in BLE application
I am working on a battery sensitive BLE project which combines the MAX30003 ECG sensor and the LSM6DS3 accelerometer. Communication with both of these devices is made through SPI. The optimal sampling ...
1
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1answer
63 views
Possibility of effectively under sampling a band pass signal?
For a university project we have been tasked with implementing a digital signal processing system on an STM32 discovery board in which we must model the AM channel to measure and graphically display ...
-1
votes
2answers
99 views
Maximum information Rate? [closed]
It is said that we can transmit at the most twice as many bits information per second as the transmission channel has the bandwidth. For example, 1 kHz bandwidth allows max 2kbit/s, if that rule is ...
4
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4answers
110 views
Sampling Theorem and reconstruction
I do not understand a concept about the Nyquist - Shannon sampling theorem.
It says that it is possibile to perfectly get the original analog signal from the signal obtained by sampling if and only ...
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0answers
35 views
Wifi versus Zigbee versus Bluetooth for real-time data sampling
I am working on a project that I would like to send and receive data between a microcontroller (ESP32) and a PC. The microcontroller supports both Wifi and Bluetooth. If I send one single data point (...
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0answers
18 views
sampling rate and bit resolution for Scanning Probe Microscopy
I am trying to compare two products and see which one offers higher performance in terms of sampling rate and bit resolution.
Below are the specs I was able to gather from product1 and product 2. (...
2
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1answer
36 views
Sampled offset voltage data and its uncertainty
In a measurement process sometimes contant voltage output of a for example force transducer is logged as offset as a bias to be subtracted later from the dynamic measurement. When the sensor is at ...
0
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1answer
99 views
Logic Analysis of a 8 bit mcu [closed]
I would like to sample the logic on the pins out out of a toy robot's processor and the MCU is an 8 bit processor that operates a max clock speed of 5 Mhz.
Does anyone have any recommendations on how ...
2
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0answers
35 views
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 ...
1
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2answers
86 views
How do we compute power from current and voltage samples? Can we quantify its accuracy?
I have a datalogger that periodically samples current values by measuring the voltage across a power resistor connected in series with a battery and sensor (the load). The datalogger also samples the ...
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0answers
19 views
Flat top sampling around t=0
I have a signal that need to be sampled using flat top. The sampling begins at t=0 and a sample is taken at every 0.01s. The length of a sample is 0.005s. Now, if i want to find the value at 0.001, ...
0
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1answer
50 views
Is it possible to use one DAC to process signals from different channels that are delayed at different times?=
So I have a small project where I need to delay multiple signals that come out from a microcontroller. The signals are around 40kHz, have the same attributes, except that they are delayed by a few ...
0
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0answers
18 views
DTFT of sampled function vs FT of impulse sampling
Given the function
$$x(t)=2\cos{2\pi4t}$$
and a sampling rate of 6Hz I'm asked to find the Fourier Transform of the sampled signal. I tried doing this in 2 ways which give me two slightly ...
1
vote
3answers
119 views
Do I need to filter before sending signal to an ADC?
I have an ADC that is capable of a 25kHz sample rate and I have a sensor whose bandwidth is 200kHz that I'd like to hook up to. This is a current sensor. Nyquist tells me that I need to limit the ...
-1
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1answer
68 views
why gyroscope sample rate can be changed by frequency, while accelerometer sample rate cannot?
This is from the mpu6050 datasheet.
In the datasheet, gyroscope sample rate can be changed by frequency, but accelerometer cannot.
Why this happens?
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1answer
77 views
Sample time of PI controller
I have designed a closed loop current control (PI controller) of a DC-DC converter in continuous time domain and it is working fine. The next task is discreetization of the controller and implement it ...
1
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3answers
121 views
How to obtain Input voltage from ADC value
I am using atmega328p for my project. I have to read my battery voltage and display it in my cloud. For that, i am using ADC. Now I am getting the ADC value for input voltage applied. But i need to ...
0
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3answers
98 views
Understanding the effect of bit depth and sampling rate on SNR
I know the meaning of a 16 bit ADC sampling at 1kHz, but I cannot relate it to SNR contribution to the signal. I also know the concept of aliasing. But even though no aliasing the resolution and the ...
0
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1answer
43 views
regarding the sampling frequence
In my project I am using PIC32MX250F128B controller and 23LC1024 SRAM. I have written a code to sample the analog signal from the vibration sensor. For this I am triggering my ADC with the help of ...
1
vote
3answers
59 views
Inherent DC Bias in ADC sampling
I was just simulating the quantization behavior of ADCs of different bits, on data sampled by a 24-bit ADC. What I noticed that as we go towards ADCs with less bits a DC bias in the signal becomes ...
0
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4answers
56 views
When reading the digital wave from a DAQ, should I be getting the same wave I'm generating to it?
I am using a DAQ device, which is said to be capable of 400kS/s maximum, and therefore 50kS/s per channel when using all 8 channels. This is listed in the manual of the 1608fs plus DAQ
So I connected ...
0
votes
1answer
201 views
Stm32F4 Discovery Board ADC
I am trying to do a partial integration on a 550 KHz waveform using STM32F4 Discovery board using the Waijung toolset in Simulink. The sampling time that I am using is 0.018 us, i.e 3 cycles, if the ...
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0answers
91 views
Confusion with Nyquist theorem when sampling cosines versus sines
I'm having different results when sampling a cosine wave versus sine wave at different scenarios. I used MATLAB to plot waveforms.
I will try to give some examples to make clear where I'm stuck at.
...
0
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1answer
43 views
Are these two ways of doing equivalent?
I have two signals sampled at, say, 256 Hz. I want to make the difference between these two signals and downsample them, say until 32 Hz.
Is it rigourously the same (in term of final result) to make ...
12
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3answers
2k views
What is the “Nyquist” rate for sampling the derivative of a signal?
Background: I'm sampling the current through a capacitor. The signal of interest is the voltage across the capacitor. I will digitally integrate the current measurement to obtain the voltage.
...
0
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2answers
188 views
Searching for a suitable method to detect peak heights of nanosecond pulses
My goal is to digitize an analog signal and measure the maximum pulse peaks via an ADC device. The signal has the frequency (pulse-repetition-rate) of f = 100 kHz. Furthermore, the analog signal ...
2
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0answers
329 views
STM32L0 ADC Interrupt Low Sampling Rate
My observed sampling rate is much lower than expected and I cannot understand why.
I have the discovery STM32L053C6 Discovery board and I want to use ADCs sampling. I started from the example ...
2
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4answers
144 views
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 ...
1
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1answer
108 views
Can phase noise be averaged out?
I have an ADC sampling a downconverted RF signal at fs. I obtain N=2^15 samples of the RF input signal "fcarrier + fs/10".
The more I average, the more the entire noise floor shifts down (as expected,...
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3answers
1k views
Sampling rate understanding for ADC requirement
So I have this voltage plot. These are voltages corresponding to a current changes on a wire.
I am trying to understand the rate of transmission for choosing a ADC to read these analog values.
The ...
0
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1answer
100 views
reverse engineering the Nord Lead 4 control board
I am reverse engineering a synthesizer named nord lead 4. I want to tap in between the control board and mainboard which has the microprocessor.
i didn’t started with the powered on analysis but i am ...
0
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1answer
49 views
minimum readable rise/fall times in an oscilloscope
How can I calculate minimum readable rise/fall times of a signal in an oscilloscope (from practical point of view)? Does it depend just to bandwidth and sampling rate of oscilloscope? regards
0
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0answers
66 views
Constructing a reactive lighting system?
I've recently written a Matlab script to develop/simulate PWM output for RGB lights based on sampled audio input. I made this script with plans to actually construct a device that can run the ...
2
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0answers
50 views
Audio Sampling for Reactive Lighting
I'm trying to work on a reactive lighting project and I'm confused about a couple topics when it comes to sampling audio.
I want to be able to have RGB reactive lighting controlled by a ...
3
votes
3answers
161 views
How does playback rate of an arbitrary waveform generator determine frequency content of that signal?
I'm trying to clear up some conceptual confusion I have about digital signal processing.
Say I have a 1000 point digital signal (stored in the memory of my arbitrary waveform generator "AWG"), and I ...
0
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1answer
40 views
In this wind sensor, how can I increase the sampling rate (takes up to a minute to update)?
I am using this LaCross TX23U wind sensor. Although not critical for this question, here is the communication protocol. The manual indicates a wind speed sampling rate of 4.5 seconds.
When the rotary ...
2
votes
2answers
273 views
Biasing an AC signal for sampling - detect minor changes via Arduino
I am trying to bias an AC signal and to the best of my knowledge I've come up with this circuit. please be easy on me am just getting used to the concept/terms of sampling and biasing.
I am trying to ...
0
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1answer
39 views
Source synchronous interfacing. How to sample serial data
I'm stuck with a sampling issue. I'm trying to sample a serial data line coming from a sensor.
Basically, I send clk (max. 5Mhz) from the FPGA to the sensor, and then I receive the data bits from the ...
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5answers
4k views
Why sample at a certain frequency just to immediately downsample it?
I apologize if this question is not well-posed. I'm reading a paper that claims the following:
The magnetometer vectors are sampled at 100 Hz. The detector filters and down samples the vectors down ...
4
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3answers
936 views
Sample sine wave [duplicate]
I need to sample a sine wave in order to create a lookup table. I know the Shannon theorem but I still don't understand how to apply it. I want to have 256 discrete samples of the sine wave that will ...
0
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2answers
109 views
A question about aliasing and sampling
Imagine an ADC unit with a sampling rate fs is not used with an anti-aliasing filter and the sampled data is logged. If in FFT of this logged file one sees a suspicious frequency component call it fx, ...
7
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4answers
3k views
Can the Nyquist sampling rate also apply for the human eye the same as in electronics? [closed]
In electronics the Nyquist sampling rate shows you the maximum frequency that could be sampled without aliasing. So if the human eye is able to see 24fps does it mean that you can see all the ...
