DSP Blockset

Example: Exporting a Frame-Based Signal.   In the model below, the To Workspace block exports a three-channel frame-based signal with the following data:

• Channel 1: 1, 2, 3, 4, 5,..., 100, 0, 0, 0,...
• Channel 2: -1, -2, -3, -4, -5,..., -100, 0, 0, 0,...
• Channel 3: 5, 5, 5, 5, 5,..., 0, 0, 0,...

To create the model, define the following variables at the MATLAB command line.

A = [1:100;-1:-1:-100]';          % 100-by-2 matrix
B = 5*ones(100,1);                % 100-by-1 column vector

Matrix A represents a two-channel signal with 100 samples, and matrix B represents a one-channel signal with 100 samples.

Specify the following parameter values in the Signal From Workspace block:

• Signal = [A B]
• Sample time = 1
• Samples per frame = 4
• Form output after final data value = Setting to zero

The Sample time setting of 1 and Samples per frame setting of 4 yield a frame-based output with sample period of 1 second and frame period of 4 seconds.

Specify the following parameter values in the To Workspace block:

• Variable name = yout
• Limit data points to last = inf
• Decimation = 1
• Sample time = -1
• Save format = Array

Run the model, and look at output yout. The first 10 samples (rows) are shown.

yout =
     1    -1     5
     2    -2     5
     3    -3     5
     4    -4     5
     5    -5     5
     6    -6     5
     7    -7     5
     8    -8     5
     9    -9     5
    10   -10     5

The following two sections may also be of interest:

• Creating Signals Using the Signal From Workspace Block
• Constructing Multichannel Sample-Based Signals

Exporting a Frame-Based Signal Using the To Workspace Block

Exporting and Playing WAV Files