EdgeDetect Block

Detects rising, falling, or any change in the input signal. Outputs 1 on detected edge, 0 otherwise.

# EdgeDetect Block

Description

Detects changes in the input signal. Can detect rising edges (input increases), falling edges (input decreases), or any change.

Mathematical Model

rising:  y[n] = 1  if u[n] > u[n-1], else 0
falling: y[n] = 1  if u[n] < u[n-1], else 0
either:  y[n] = 1  if u[n] ≠ u[n-1], else 0

First sample: y[0] = 0 for all modes.

Parameters

mode

Detection mode:

• rising: Detect when input increases (replaces DetectIncrease)
• falling: Detect when input decreases
• either: Detect any change in either direction

Remarks

• Pulse width: Output is high for exactly one simulation timestep per detected edge
• First sample: Always outputs 0 on the first sample (no prior state available)
• Noise sensitivity: EdgeDetect triggers on any change; pre-filter noisy signals before edge detection
• Rising vs falling: Use rising for positive-going thresholds, falling for negative-going
• Either mode: Detects any change in either direction; useful for change-of-state triggers

See Also

• Comparator: Threshold-based comparison
• IntervalTest: Range-based detection