Overview
DSP Concepts proprietary Quiescent Sound detector. Version 1.
Discussion
DSP Concepts proprietary Quiescent Sound Detector module. This module analyzes the incoming audio stream and determines if there is "interesting" sound which should trigger the rest of the system to wake up. The module is typically used to deactivate processing when there is no sound present.
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The module has three tunable parameters. If the RMS level of the input signal is above snrThreshold, then the system wakes up. Otherwise, if the signal is below snrThreshold, if the instantaneous level is snrThreshold above the average level, then it will wake up. Both noiseFloorThreshold and snrThreshold are in units of dB.
Type Definition
| Code Block |
|---|
typedef struct _ModuleQSDv1
{
ModuleInstanceDescriptor instance; // Common Audio Weaver module instance structure
FLOAT32 noiseFloorThreshold; // Any signals above this level trigger detector.
FLOAT32 snrThreshold; // dB above background noise floor to trigger.
void * QSDptr; // Pointer to dspc_qsd structure
} ModuleQSDv1Class; |
Variables
Properties
Name | Type | Usage | isHidden | Default value | Range | Units |
noiseFloorThreshold | float | parameter | 0 | -60 | -80:1:0 | dB |
snrThreshold | float | parameter | 0 | 6 | 0:1:20 | dB |
QSDptr | void * | state | 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: int
MATLAB Usage
File Name: qsd_v1_module.m
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