Digital signal and image processing
Speedrun
Digital signal processing in 30 seconds
Digital signal processing in 30 seconds. Go.
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Lesson notes
Key points
- Sampling: Sampling measures a continuous signal at regular time intervals.
- Nyquist rate: Sample faster than twice the highest frequency to avoid aliasing.
- Quantisation: Each sample is rounded to one of two-to-the-n levels.
- Convolution: An LTI system's output is input convolved with impulse response.
- FIR vs IIR: FIR uses no feedback; IIR feeds outputs back in.
- Fourier transform: Fourier splits any signal into its frequency components.
Takeaway: Sample, quantise, filter, transform: that is the DSP chain.
Quick check: Which filter type uses feedback from past outputs?
- FIR filter
- Median filter
- IIR filter
IIR filters feed previous outputs back, giving an infinite impulse response.
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