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Sine, Cosine - Implement sine and/or cosine wave in fixed point using lookup table approach that exploits quarter wave symmetry

Library

Lookup Tables (Sine block or Cosine block)

Description

The Sine and Cosine block implements a sine and/or cosine wave in fixed point using a lookup table method that exploits quarter wave symmetry.

The Sine and Cosine block can output the following functions of the input signal, depending upon what you select for the Output formula parameter:

You define the number of lookup table points in the Number of data points for lookup table parameter. The block implementation is most efficient when you specify the lookup table data points to be (2^n)+1, where n is an integer.

Use the Output word length parameter to specify the word length of the fixed-point output data type. The fraction length of the output is the output word length minus 2.

Data Type Support

The Sine and Cosine block accepts signals of any numeric data type supported by Simulink software, including fixed-point data types. The output of the block is a fixed-point data type.

Parameters and Dialog Box

Output formula: Select the signal(s) to output.
Number of data points for lookup table: Specify the number of data points to retrieve from the lookup table. The implementation is most efficient when you specify the lookup table data points to be (2^n)+1, where n is an integer.
Output word length: Specify the word length for the fixed-point data type of the output signal. The fraction length of the output is the output word length minus 2.

Characteristics

Direct Feedthrough	Yes
Scalar Expansion	N/A