Event-Count Comparator

Detect threshold crossing of accumulated nonzero inputs

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Libraries:
DSP System Toolbox / Signal Management / Switches and Counters

Description

The Event-Count Comparator block detects the number of nonzero inputs at the Data port during the period that the block is enabled by a high signal (of value 1) at the Int port. Both inputs must be scalars.

When the number of accumulated nonzero inputs first equals the value in the Event threshold parameter, the block waits one additional sample interval, and then sets the Out port to 1. The block holds the Out port at 1 until the signal at the Int port transitions from a low value (0) to a high value (1).

Examples

Detect Threshold Crossings Using Event Count Comparator Block

Open the ex_eventcountcomp_ref model. The Event-Count Comparator block (Event threshold = 3) detects two threshold crossings in the input to the Data port, one at sample 4 and one at sample 12.

• Open Model

Ports

Input

Data — Data input

scalar

Specify the data input as a discrete-time scalar.

The Event-Count Comparator block accepts real and complex floating-point and fixed-point inputs. However, because the block has a discrete state, it does not support constant or continuous sample times. Therefore, you must connect at least one of the input ports or the output port of the Event-Count Comparator block to a block whose Sample time parameter is discrete. The Event-Count Comparator block inherits this noninfinite discrete sample time.

Data Types: single | double | int8 | int16 | int32 | uint8 | uint16 | uint32 | Boolean | fixed point | enumerated
Complex Number Support: Yes

Int — Interval enable signal

scalar

Specify the interval enable signal as a scalar. A nonzero input at this port enables the block to begin counting and resets the output.

Data Types: single | double | int8 | int16 | int32 | uint8 | uint16 | uint32 | Boolean | fixed point | enumerated

Output

Out — Detect required number of nonzero inputs

true or 1 | false or 0

The block returns a logical 1 if the number of nonzero inputs over time equals or exceeds the value you specify in the Event threshold parameter.

Data Types: Boolean

Parameters

Event threshold — Event threshold

10 (default) | nonnegative integer

Specify the event threshold as a nonnegative integer. The block compares the number of nonzero inputs to this value. If the number of nonzero inputs over time equals or exceeds the value you specify in this parameter, the block returns a logical 1.

Tunable: Yes

Block Characteristics

Data Types	Boolean | double | enumerated | fixed point | integer | single
Direct Feedthrough	no
Multidimensional Signals	no
Variable-Size Signals	no
Zero-Crossing Detection	no

Extended Capabilities

C/C++ Code Generation

Generate C and C++ code using Simulink® Coder™.

Generated code relies on the memcpy or memset function (string.h) under certain conditions.

Version History

Introduced before R2006a