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.

Note that the module is not smoothly varying. If you update the gain value, you may introduce an audible click. For clickless operation, use the ScalerDBSmoothedFract32 module instead.

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)