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ScalerNDBSmoothedFract32

Overview

Smoothly varying linear Fract32 scaler with independent gains in dB units

Discussion

Multichannel scaler, where each input channel has its own individual smoothly varying gain value. The gain parameter consists of an array of gains, one per input/output channel with units of dB. All gain parameters are exponentially smoothed (first order IIR) at the sample rate, with the smoothingTime parameter determining the smoothing rate for all of the gain values.

Type Definition

CODE
typedef struct _ModuleScalerNDBSmoothedFract32
{
    ModuleInstanceDescriptor instance;            // Common Audio Weaver module instance structure
    FLOAT32 smoothingTime;                        // Time constant of the smoothing process
    fract32 smoothingCoeff;                       // Smoothing coefficient
    INT32 postShift;                              // Number of bits to shift after the fractional multiply. This is based on gain.range.
    FLOAT32 twoPowMinusPostShift;                 // 2^(-postShift). Used by to streamline the operation of the set function
    FLOAT32* gainDB;                              // Array of gains, one per channel
    fract32* targetGain;                          // Array of gains, one per channel
    fract32* currentGain;                         // Array of instantaneous gains, one per channel
} ModuleScalerNDBSmoothedFract32Class;

Variables

Properties

Name

Type

Usage

isHidden

Default value

Range

Units

smoothingTime

float

parameter

0

10

0:1000

msec

smoothingCoeff

fract32

derived

1

0.002081

Unrestricted

postShift

int

derived

1

4

Unrestricted

twoPowMinusPostShift

float

derived

1

0.0625

Unrestricted

gainDB

float*

parameter

0

[1 x 1]

-40:0.1:20

dB

targetGain

fract32*

derived

0

[1 x 1]

Unrestricted

currentGain

fract32*

state

0

[1 x 1]

Unrestricted

Pins

Input Pins

Name: in

Description: Input signal

Data type: fract32

Channel range: Unrestricted

Block size range: Unrestricted

Sample rate range: Unrestricted

Complex support: Real

Output Pins

Name: out

Description: Output signal

Data type: fract32

MATLAB Usage

File Name: scalern_db_smoothed_fract32_module.m

CODE
 M=scalern_db_smoothed_fract32_module(NAME)
 Multichannel scaler module with individual control of gains in each
 channel.  The gain controls are in dB units.  Arguments:
    NAME - name of the module.

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