Documentation

This is machine translation

Translated by Microsoft
Mouse over text to see original. Click the button below to return to the English verison of the page.

Measurements and Statistics

Bistate waveform measurements, variance, histogram, autocorrelation

You can use DSP System Toolbox™ blocks and System objects to measure the moving statistics and stationary statistics of signals in MATLAB® and Simulink®. Moving statistics refer to the statistics of streaming signals that change with time. In the sliding window method for computing moving statistics, a window of specified length moves over the data sample by sample as the new data comes in. The objects and blocks compute the statistics of the data within this window. The exponential weighting method applies a set of weights to the data samples and processes the weighted data. These weights are computed recursively based on the age of the data. For stationary statistics, the blocks and objects compute the statistics of all the data that is available in a batch.

In addition to measuring statistics, you can also measure the histogram, pulse metrics, and transition metrics of signals by using the dsp.Histogram, dsp.PulseMetrics, and dsp.TransitionMetrics System objects.

System Objects

dsp.MedianFilter Median filter
dsp.MovingAverage Moving average
dsp.MovingMaximum Moving maximum
dsp.MovingMinimum Moving minimum
dsp.MovingRMS Moving Root Mean Square
dsp.MovingStandardDeviation Moving standard deviation
dsp.MovingVariance Moving variance
dsp.Autocorrelator Autocorrelation sequence
dsp.Crosscorrelator Cross-correlation of two inputs
dsp.Maximum Find maximum value of input or sequence of inputs
dsp.Mean Find mean value of input or sequence of inputs
dsp.Median Median value of input
dsp.Minimum Find minimum values of input or sequence of inputs
dsp.RMS Root mean square of vector elements
dsp.StandardDeviation Standard deviation of input or sequence of inputs
dsp.Variance Variance of input or sequence of inputs
dsp.Histogram Histogram of input or sequence of inputs
dsp.PeakToPeak Peak-to-peak value
dsp.PeakToRMS Peak-to-root-mean-square value of vector
dsp.PulseMetrics Pulse metrics of bilevel waveforms
dsp.StateLevels State-level estimation for bilevel rectangular waveform
dsp.TransitionMetrics Transition metrics of bilevel waveforms

Blocks

Median Filter Median filter
Moving Average Moving average
Moving Maximum Moving maximum
Moving Minimum Moving minimum
Moving RMS Moving RMS
Moving Standard Deviation Moving standard deviation
Moving Variance Moving variance
Autocorrelation Autocorrelation of vector or matrix input
Correlation Cross-correlation of two inputs
Maximum Find maximum values in input or sequence of inputs
Mean Find mean value of input or sequence of inputs
Median Find median value of input
Minimum Find minimum values in input or sequence of inputs
RMS Compute root-mean-square value of input or sequence of inputs
Sort Sort input elements by value
Standard Deviation Find standard deviation of input or sequence of inputs
Variance Compute variance of input or sequence of inputs
Histogram Generate histogram of input or sequence of inputs

Topics

What Are Moving Statistics?

Learn how moving statistics are calculated.

Sliding Window Method and Exponential Weighting Method

Learn the differences between the sliding window method and exponential weighting method.

How Is a Moving Average Filter Different from an FIR Filter?

Moving average filter is a special case of the FIR filter.

Signal Statistics

This example shows how to perform statistical measurements on an input data stream using DSP System Toolbox™ functionality available at the MATLAB® command line.

Measure Statistics of Streaming Signals

Compute the moving average of streaming signals using MATLAB functions and System objects.

Remove High-Frequency Noise from Gyroscope Data

Remove high-frequency noise using a median filter.

Energy Detection in the Time Domain

Detect the event when the signal energy crosses a particular threshold value.

Measure Pulse and Transition Characteristics of Streaming Signals

Learn how to compute the basic pulse and transition metrics of streaming signals.

Variable-Size Signal Support DSP System Objects

List of System objects which support variable-sized signals in DSP System Toolbox.

Featured Examples

Was this topic helpful?