GraphicEQFract32

Overview

10 band graphic equalizer in which each section has order 8.

Discussion

Note

THIS MODULE IS DEPRECATED AND NOT RECOMMENDED FOR NEW DESIGNS. 
PLEASE USE THE GraphicEqV2Fract32 MODULE INSTEAD.

This subsystem implements a complete multiband graphic equalizer. The number of bands and filter order is specified at instantiation time. The subsystem consists of a cascade of individual band pass filters.

The subsystem supports floating-point and fract32 data. The data type to use is specified at instantiation time. For floating-point data, the subsystem using the graphic_eq_band_module.m module. For fract32 data, the subsystem using the graphic_eq_band_fract32_module.m module. See these modules for additional details.

The upper and lower band edges of the bandpass filter modules are set to logarithmic spacing between 20 Hz and 20 kHz. These default values can be overridden after the subsystem has been created.

Module Pack

Standard

ClassID

classID =

Type Definition

typedef struct _ModuleGraphicEQFract32
{
ModuleInstanceDescriptor instance;            // Common Audio Weaver module instance structure
} ModuleGraphicEQFract32Class;

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

Output Pins


Name	out
Description	Audio output
Data Type	fract32

Scratch Pins


Channel Count	1
Block size	32
Sample rate	48000


Channel Count	1
Block size	32
Sample rate	48000

Matlab Usage

File Name: graphic_eq_fract32_subsystem.m 
 SYS=graphic_eq_fract32_subsystem(NAME, NBANDS, ORDER) 
 Creates a multi-band graphic EQ subsystem constructed as a cascade 
 of individual sections.  Each section is realized as a 
 graphic_eq_band_module.m.  Arguments: 
    NAME - name of the module. 
    NBANDS - number of bands.  By default, NBANDS=10. 
    ORDER - order of each filter section.  This must equal 4, 8, or 12. 
            By default, ORDER=8. 

 As a rule of thumb, you can use 4th order filters for NBANDS=1 to 5; 
 8th order filters for NBANDS=6 to 15; and 12th order filter for 
 NBANDS=16 and above. 

 Internally, the system uses a cascade of graphic_eq_band_module.m 
 modules.  The initial upper and lower band edges are set to provide a 
 roughly logarithmic spacing for the filters.  The band edge frequencies 
 may be changed after instantiation.