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ClipIndicatorFract32

Overview

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

Type Definition

CODE
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

CODE
 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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