Overview
Detects when a signal crosses zero and changes sign
Discussion
Multichannel zero-crossing detector, running at the sampling rate. The module outputs a 1.0 whenever a zero crossing is detected and 0.0 otherwise. The detectorType parameter controls the behavior of the detector.
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If detectorType < 0, then only negative transitions (positive->negative) are detected.
Type Definition
| Code Block |
|---|
typedef struct _ModuleZeroCrossingDetector
{
ModuleInstanceDescriptor instance; // Common Audio Weaver module instance structure
INT32 detectorType; // Determines which zero crossings are detected: 0=all, >0 negative->positive, <0 positive->negative.
INT32* lastSign; // Holds the sign of the last input value. This is an array so that multiple channels can be supported.
} ModuleZeroCrossingDetectorClass; |
Variables
Properties
Name | Type | Usage | isHidden | Default value | Range | Units |
detectorType | int | parameter | 0 | 0 | -1:1 | |
lastSign | int* | state | 1 | [1 x 1] | Unrestricted |
Pins
Input Pins
Name: in
Description: audio input
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Sample rate range: Unrestricted
Complex support: Real
Output Pins
Name: out
Description: audio output
Data type: float
MATLAB Usage
File Name: zero_cross_detector_module.m
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