# Tag Info

Accepted

### Why sample at a certain frequency just to immediately downsample it?

if they wanted the sampling frequency to be 10Hz, why did they not just sample at 10Hz initially? In order to avoid aliasing, the signal has to be lowpass-filtered before sampling. No frequencies ...
• 63.2k

### When is it required or permitted to sample below Nyquist rate

First of all, let's get rid of the Nyquist rate misconception. People are usually taught that the minimum sampling frequency needs to be twice the frequency of the highest frequency in the signal. ...
• 22.9k
Accepted

### Word or phrase to describe how frequently a value is measured

The name for the frequency the samples are taken is Sampling Rate (not specific to audio only). It is measured in samples-per-second or in Hz (which is ...
• 9,771

### How is 10G Ethernet physically possible?

Chasing this answer down took a few different links, but it appears to boil down to this: 1. 4 differential pairs (8 wires total, but only 4 lanes). 2. 800 Mega Symbols a second. 3. Using PAM16, 16 ...
• 12.5k
Accepted

### Why does increasing the sampling rate make implementing an anti-aliasing filter easier?

As you decrease the sampling frequency there is less separation between the images in the frequency domain. source Remember that the repetition of the spectrum occurs at the sampling frequency. When ...
• 5,954
Accepted

### Can sampling rate be a floating point number?

Forget sampling rate for a few seconds... Think about sampling period for a second, which is the time interval between two consecutive samples. This time can be an integer or any real number (as long ...
• 2,167

### Word or phrase to describe how frequently a value is measured

I would call it the sampling period or measurement period. For short periods like 1 ms, specifying the sampling frequency is another option (1 kHz).
• 5,846
Accepted

### Lossless compression technique for digital signals in an embedded system

Compression is all about finding the redundancies in the data and removing them. Since you don't seem to be able to tell us much about your actual data sets, this answer will have to be very generic. ...
• 165k
Accepted

### Can the Nyquist sampling rate also apply for the human eye the same as in electronics?

The firing of neurons in the eye is completely asynchronous, so for all intents and purposes, the process we call "seeing" must be considered continuous-time, not sampled. Nyquist does not apply. If ...
• 165k
Accepted

### What is the "Nyquist" rate for sampling the derivative of a signal?

Taking a derivative (or an integral) is a linear operation — it doesn't create any frequencies that weren't in the original signal (or remove any), it just changes their relative levels. So the ...
• 165k