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# pulseperiod() - Signal Processing

### Syntax

### Example

### Output / Return Value

### Limitations

### Alternatives / See Also

### Reference

P = pulseperiod(X) returns a vector, P, containing the difference between the mid-reference level instants of the initial transition of each positive-polarity pulse and the next positive-going transition in the bilevel waveform, X. If pulseperiod does not find two positive-polarity transitions, P is empty. To determine the transitions for each pulse, pulseperiod estimates the state levels of the input waveform by a histogram method and identifies all regions which cross the upper-state boundary of the low state and the lower-state boundary of the high state. The low-state and high-state boundaries are expressed as the state level plus or minus a multiple of the difference between the state levels. See State-Level Tolerances. Because pulseperiod uses interpolation to determine the mid-reference level instants, P may contain values that do not correspond to sampling instants of the bilevel waveform, X.P = pulseperiod(X,FS) specifies the sampling rate in hertz as a positive scalar. The first sample instant in X corresponds to t=0. Because pulseperiod uses interpolation to determine the mid-reference level instants, P may contain values that do not correspond to sampling instants of the bilevel waveform, X.P = pulseperiod(X,T) specifies the sampling instants in a vector equal in length to X. Because pulseperiod uses interpolation to determine the mid-reference level instants, P may contain values that do not correspond to sampling instants of the bilevel waveform, X.[P,INITCROSS] = pulseperiod(...) returns the mid-reference level instants of the first transition of each pulse.[P,INITCROSS,FINALCROSS] = pulseperiod(...) returns the mid-reference level instants of the final transition of each pulse.[P,INITCROSS,FINALCROSS,NEXTCROSS] = pulseperiod(...) returns the mid-reference level instants of next detected transition after each pulse.[P,INITCROSS,FINALCROSS,NEXTCROSS,MIDLEV] = pulseperiod(...) returns the mid-reference level,MIDLEV. [P,INITCROSS,FINALCROSS,NEXTCROSS,MIDLEV] = pulseperiod(...,Name,Value) returns the pulse periods with additional options specified by one or more Name,Value pair arguments.pulseperiod(...) plots the signal and darkens every other identified pulse. It marks the location of the mid crossings, and their associated reference level. The state levels and their associated lower and upper boundaries (adjustable by the Name,Value pair with name 'Tolerance') are also plotted.

P = pulseperiod(X)P = pulseperiod(X,FS)P = pulseperiod(X,T)[P,INITCROSS] = pulseperiod(...)[P,INITCROSS,FINALCROSS] = pulseperiod(...)[P,INITCROSS,FINALCROSS,NEXTCROSS] = pulseperiod(...)[P,INITCROSS,FINALCROSS,NEXTCROSS,MIDLEV] = pulseperiod(...)[P,INITCROSS,FINALCROSS,NEXTCROSS,MIDLEV] = pulseperiod(...,Name,Value)pulseperiod(...)

Pulse Period of Bilevel WaveformOpen This Example Compute the pulse period of a bilevel waveform with two positive-polarity transitions. The sample rate is 4 MHz. load('pulseex.mat','x','t') p = pulseperiod(x,t) p = 5.0030e-06 Annotate the pulse period on a plot of the waveform.pulseperiod(x,t); Mid-Reference Level Instants of Pulse PeriodOpen This Example Determine the mid-reference level instants that define the pulse period for a bilevel waveform. load('pulseex.mat','x','t'); [~,initcross,~,nextcross] = pulseperiod(x,t) initcross = 3.1240e-06 nextcross = 8.1270e-06 Output the pulse period. Mark the mid-reference level instants on a plot of the data.pulseperiod(x,t) ans = 5.0030e-06