see the help patch to get an idea: menu: Help -> Library -> Community -> tiar -> osc -> noisin.
This object generates a noisy sine wave, i.e. a band of noise.
The noise depth can be controlled by noise inlet and param
The module includes a DCA controlled by amp inlet and param
Technically, the effect is caused by random frequency modulation. The trick is that this modulation only occurs when the derivative of the sine wave is near zero, this way, the bandwidth can be controlled.