M
MRW
- Jan 1, 1970
- 0
Hello,
Can someone please para-phrase the following?
"To avoid aliasing, an analog low-pass filter is placed at the input
before the sampler. The low-pass filter determines the highest
frequency of the FFT analyzer. Because the rate at which signals can
be represented without error is one half the maximum sampling rate,
signals are often cut off at a lower frequency to provide sampling
rates greater than twice the maximum frequency components. Typically
the cutoff of the low-pass filter is 2.5 times less than the maximum
sampling rate of the analyzer. This determines the maximum frequency
component."
The part that I'm especially confused at is: "Because the rate at
which signals can be represented without error is one half the maximum
sampling rate, signals are often cut off at a lower frequency to
provide sampling rates greater than twice the maximum frequency
components"
I cannot picture this properly.
Thanks!
Can someone please para-phrase the following?
"To avoid aliasing, an analog low-pass filter is placed at the input
before the sampler. The low-pass filter determines the highest
frequency of the FFT analyzer. Because the rate at which signals can
be represented without error is one half the maximum sampling rate,
signals are often cut off at a lower frequency to provide sampling
rates greater than twice the maximum frequency components. Typically
the cutoff of the low-pass filter is 2.5 times less than the maximum
sampling rate of the analyzer. This determines the maximum frequency
component."
The part that I'm especially confused at is: "Because the rate at
which signals can be represented without error is one half the maximum
sampling rate, signals are often cut off at a lower frequency to
provide sampling rates greater than twice the maximum frequency
components"
I cannot picture this properly.
Thanks!