ScalerDBFract32

Overview

DB Fract32 multichannel scaler

Discussion

The Scaler DB module scales multichannel signals by a single gain value specified in dB, gainDB. gainDB is automatically converted to a linear value: gain. Internally gain is the gain actually applied to the signal. The module has 1 input pin and 1 output pin of the same dimension as the input.

The module is not smoothly varying, and the gain value is applied to both the real and imaginary parts. If you update the gain value, you may introduce an audible click. For clickless operation, use the ScalerDBSmoothedFract32 module instead, which does not work with complex data.

Module Pack

Standard

ClassID

classID = 185

Type Definition

typedef struct _ModuleScalerDBFract32
{
ModuleInstanceDescriptor instance;            // Common Audio Weaver module instance structure
FLOAT32 gainDB;                               // Gain in DB
fract32 gainFract32;                          // Gain in fract32 linear units
INT32 shift;                                  // Number of bits to shift
} ModuleScalerDBFract32Class;

Variables

Properties

Name	Type	Usage	isHidden	Default Value	Range	Units
gainDB	float	parameter	0	0	-40:0.1:20	dB
gainFract32	fract32	derived	1	0.5	Unrestricted	linear
shift	int	derived	1	1	Unrestricted

Pins

Input Pins


Name	in1
Description	Input signal
Data type	fract32
Channel range	Unrestricted
Block size range	Unrestricted
Sample rate range	Unrestricted
Complex support	Real and Complex

Output Pins


Name	out1
Description	Output signal
Data Type	fract32

Matlab Usage

File Name: scaler_db_fract32_module.m 
 M=scaler_db_fract32_module(NAME, NUMPINS) 
 Creates a DB scaler for use with the Audio Weaver.  The scaler 
 has a single multichannel input and scales all channels by the same 
 value.  Arguments: 
    NAME - name of the module. 
    NUMPINS - number of input pins (optional)