DSP Blockset

Creating an Acoustic Environment

In this topic, you learn how to create an acoustic environment that simulates both white noise and colored noise added to an input signal. You later use this environment to build a model capable of adaptive noise cancellation:

1. At the MATLAB command line, type dspanc.

1. The DSP Blockset Acoustic Noise Cancellation demo opens.

2. Copy and paste the subsystem called Acoustic Environment into a new model file.
3. Double-click the Acoustic Environment subsystem.

1. Gaussian noise is used to create the signal sent to the Exterior Mic output port. If the input to the Filter port changes from 0 to 1, the Digital Filter block changes from a lowpass filter to a bandpass filter. The filtered noise output from the Digital Filter block is added to signal coming from a .wav file to produce the signal sent to the Pilot's Mic output port.

You have now created an acoustic environment. In the following topics, you use this acoustic environment to produce a model capable of adaptive noise cancellation. Your next task is to create an adaptive filter. See Creating an Adaptive Filter.

Adaptive Filters

Creating an Adaptive Filter