Elaborazione del segnale multi-rate
Ricampiona i dati uniformi o non uniformi a una nuova velocità fissa. Esegui la decimazione e l'interpolazione lineare o di ordine superiore senza introdurre aliasing.
App
| Signal Analyzer | Visualize and compare multiple signals and spectra |
Funzioni
decimate | Decimation — decrease sample rate by integer factor |
downsample | Decrease sample rate by integer factor |
fillgaps | Fill gaps using autoregressive modeling |
interp | Interpolation — increase sample rate by integer factor |
interp1 | Interpolazione di dati monodimensionali (ricerca in tabella) |
intfilt | Interpolation FIR filter design |
pchip | Piecewise Cubic Hermite Interpolating Polynomial (PCHIP) |
resample | Resample uniform or nonuniform data to new fixed rate |
spline | Cubic spline data interpolation |
upfirdn | Upsample, apply FIR filter, and downsample |
upsample | Increase sample rate by integer factor |
Argomenti
- Avoid Aliasing in Signal Downsampling
Aliasing is the distortion that occurs when copies of a signal's spectrum overlap. Downsampling can introduce aliasing.
- Signal Filtering Before Downsampling
Filter before downsampling to mitigate the distortion caused by aliasing.
- Signal Upsampling and Imaging Artifacts
Upsample a signal and see how upsampling can result in images.
- Signal Upsampling and Interpolation Filtering
Upsample a signal and apply a lowpass interpolation filter to remove imaging artifacts.
- Simulate a Sample-and-Hold System
Simulate the output of a sample-and-hold system by upsampling and filtering a signal.
- Signal Resampling
Decimate, interpolate, or change the sample rate of signals, with or without intermediate filtering.
- Change Signal Sample Rate
Change the sample rates of a sinusoid and a recorded speech sample.
- Multirate Filter Bank Implementation
Implement filter banks using the
upfirdnfunction.
Esempi in primo piano
Reconstruct Missing Data
Reconstruct missing data using interpolation, antialiasing filtering, and autoregressive modeling.
Resample Uniformly Sampled Signals
Resample a uniformly sampled signal to a new uniform rate; reduce the impact of large transients and remove unwanted high-frequency content.
Resample Nonuniformly Sampled Signals
Resample a nonuniformly sampled signal to a new uniform rate; apply custom filters to reduce aliasing; remove edge transients.
Obtain Signal Phases Using Downsampling
Use downsampling to obtain the polyphase components of a signal.
