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Misure spettrali

Potenza del canale, larghezza di banda, frequenza media, frequenza mediana, distorsione armonica

Utilizza obw e powerbw per trovare il 90% occupato e le larghezze di banda di 3 dB di un segnale. Calcola la frequenza media o mediana di uno spettro di potenza. Stima la potenza su una data banda di frequenza. Misura la distorsione armonica. Stima la larghezza di banda istantanea, la frequenza istantanea, l'entropia spettrale e la curtosi spettrale.

Funzioni

espandi tutto

Potenza e larghezza di banda

`bandpower`	Band power
`enbw`	Equivalent noise bandwidth
`instbw`	Estimate instantaneous bandwidth (Da R2021a)
`instfreq`	Estimate instantaneous frequency
`meanfreq`	Mean frequency
`medfreq`	Median frequency
`obw`	Occupied bandwidth
`powerbw`	Power bandwidth
`spectralCrest`	Spectral crest for signals and spectrograms
`spectralEntropy`	Spectral entropy for signals and spectrograms
`spectralFlatness`	Spectral flatness for signals and spectrograms
`spectralKurtosis`	Spectral kurtosis for signals and spectrograms
`spectralSkewness`	Spectral skewness for signals and spectrograms
`signalFrequencyFeatureExtractor`	Streamline signal frequency feature extraction (Da R2021b)
`signalTimeFrequencyFeatureExtractor`	Streamline signal time-frequency feature extraction (Da R2024a)

Misure armoniche

`sfdr`	Spurious free dynamic range
`signalTimeFeatureExtractor`	Streamline signal time feature extraction (Da R2021a)
`sinad`	Signal to noise and distortion ratio
`snr`	Signal-to-noise ratio
`thd`	Total harmonic distortion
`toi`	Third-order intercept point

Argomenti

Measure the Power of a Signal
Estimate the width of the frequency band that contains most of the power of a signal. For distorted signals, determine the power stored in the fundamental and the harmonics.
Measure Total Harmonic Distortion
Measure the total harmonic distortion of a sinusoidal signal.

Esempi in primo piano

Analyze Harmonic Distortion

Analyze the harmonic distortion of a weakly nonlinear system in the presence of noise.

Apri live script

Spurious-Free Dynamic Range (SFDR) Measurement

Measure the SFDR of a numerically controlled oscillator and explore the effects of adding phase dither.

Apri script

Measure Signal Similarities

Compare signals with different sample rates or frequency content, measure delays, and determine if there is a signal in a measurement.

Apri live script

Audio Device Test Stimuli

Exercise a nonlinear system with common audio device stimuli and compare the advantages and disadvantages of the different stimuli.

(Audio Toolbox)