In signal processing, sampling is the reduction of a continuous signal to a discrete signal. A common example is the conversion of a sound wave (a continuous signal) to a sequence of samples (a discrete-time signal).
A sample is a value or set of values at a point in time and/or space.
A sampler is a subsystem or operation that extracts samples from a continuous signal.
A theoretical ideal sampler produces samples equivalent to the instantaneous value of the continuous signal at the desired points.
Sampling can be done for functions varying in space, time, or any other dimension, and similar results are obtained in two or more dimensions.
For functions that vary with time, let s(t) be a continuous function (or "signal") to be sampled, and let sampling be performed by measuring the value of the continuous function every T seconds, which is called the sampling interval. Then the sampled function is given by the sequence:
The sampling frequency or sampling rate, fs, is the average number of samples obtained in one second (samples per second), thus fs = 1/T.
The first time was the best time
The language you use
You gotta be careful what you will choose
And the first high was the best high
You're made of flesh and blood
Yet it makes you feel like wood
Oh the first time was the best time
The first line was the best line
It's hard to learn to beware
Spending thousands of pounds in a year
And worthwhile, is it worthwhile?
Ever wondered why you need more and more
to reach that sky?
Oh the first time was the worst time
And the sky is a gypsy
Oh, will I die with her with me?
Oh the best time is the worst crime
Oh the first time, oh may be the worst time
Oh, worthwhile, is it really worthwhile?
When the sky is a gypsy
Oh, will I die with her with me?
And the sky is a gypsy
Will I die with her with me?
Oh no, no, no, no
The first time
Maybe the worst time
Oh no...