Overview

Table lookup where the input serves as an index into a lookup table

Discussion

Performs table lookup where the input pin is treated as an integer index. The length of the lookup table L is specified at instantiation time. The data on the input pin is clipped to the range [0 L-1] and then used as an index into the lookup table. The lookup table contains floating-point values and these are output.

When bypassed the module is still active and continues to perform the look up function.

Type Definition

typedef struct _ModuleTableLookupIntFloat
{
    ModuleInstanceDescriptor instance;            // Common Audio Weaver module instance structure
    INT32 L;                                      // Number of entries in the table
    FLOAT32* table;                               // Table of lookup values
} ModuleTableLookupIntFloatClass;

Variables

Properties

Pins

Input Pins

Name: in

Description: index

Data type: int

Channel range: Unrestricted

Block size range: Unrestricted

Sample rate range: Unrestricted

Complex support: Real

Output Pins

Name: out

Description: lookup value

Data type: float

MATLAB Usage

File Name: table_lookup_int_float_module.m

 M = table_lookup_int_float_module(NAME, L)
 Creates a table lookup module for use in the Audio Weaver environment.
 The module has an integer input pin and uses this as an index to lookup
 values in a table.  The output data and the data in the table are
 floating-point values.   Arguments:
    NAME - name of the module.
    L - size of the table.