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Overlap Add Method
Transcript
Overlap Add Method
Maryam Mahmoudi
DFT:
- Covolution two of signals (x(t),h(t)) is y(n)
- L = length(x(n))
- M = length(h(n))
- L+M-1 = length(y(n))
DFT:
- Covolution two of signals (x(t),h(t)) is y...
In speech signal
In speech signal
- Length of signal is infinitive so NDFT is taking too much time and calculation
- Take too much time for collect all of samples and filtering
Block Convolution
When the length of x[n] is long
by knowing that:
Block Convolution
Dividing signal to L sample blocks
Dividing signal to L sample blocks
Overlap add method
- Break the input signal x(n) into non-overlapping blocks xm(n) of length L(when length of x is more than length h)
- zero pading xm[n] to be of length N = L+M-1
- M is number of samples of h[n]
- L is number of samples of block x[n]
- Make h[n] like xm[n] by zero pading
x(n) & h(n)
x(n) & h(n)
y(n)
Overlook:
Overlook:
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