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(8.D.2.7) ClipIndicatorFract32

Overview

Detects clipping by measuring when a signal level exceeds a specified threshold

Type Definition

typedef struct _ModuleClipIndicatorFract32 { ModuleInstanceDescriptor instance; // Common Audio Weaver module instance structure FLOAT32 threshold; // Threshold in dB above which clipping occurs FLOAT32 attackTime; // Attack time of the clipping detector. Specifies how quickly the value is allowed to rise FLOAT32 releaseTime; // Release time of the clipping detector. Specifies how quickly the value is allowed to decay fract32 thresholdCoeff; // Internal derived parameter which equals undb20(threshold) fract32 attackCoeff; // Internal coefficient that realizes the attack time fract32 releaseCoeff; // Internal coefficient that realizes the release time fract32* value; // Internal array of envelope follower state variables, one per channel INT32* isClipping; // Boolean array of clipping values, one per channel } ModuleClipIndicatorFract32Class;

Variables

Properties

Name

Type

Usage

isHidden

Default value

Range

Units

threshold

float

parameter

0

-3

-100:0

dB

attackTime

float

parameter

0

5

0:1000

msec

releaseTime

float

parameter

0

100

0:10000

msec

thresholdCoeff

fract32

derived

1

0.7079

Unrestricted

linear

attackCoeff

fract32

derived

1

0.1248

Unrestricted

 

releaseCoeff

fract32

derived

1

0.006644

Unrestricted

 

value

fract32*

state

1

[1 x 1]

0:1000

 

isClipping

int*

state

0

[1 x 1]

0:1:1

 

Pins

Input Pins

Name: in

Description: audio input

Data type: fract32

Channel range: Unrestricted

Block size range: Unrestricted

Sample rate range: Unrestricted

Complex support: Real

Scratch Pins

Channel count: 1

Block size: 32

Sample rate: 48000

MATLAB Usage

File Name: clip_indicator_fract32_module.m

M=clip_indicator_fract32_module(NAME) Creates a module that tests for clipping of an audio signal. The clipping threshold is programmable. Arguments: NAME - name of the module.

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