RESPITE: The CASA Toolkit Page: Documentation: Block Library Index:ImpulseWave


ImpulseWave

ImpulseWave is a periodic signal generator block that generates a signal composed of regularly spaced impulses. There are 5 controlling parameters: SAMPLE_RATE, DURATION, FREQ, AMP and PHASE.

SAMPLE_RATE is in units of samples per second, DURATION is measured in seconds, FREQ in cycles per second and PHASE in radians. The impulses have an amplitude of +AMP, elsewhere the signal rests at 0. The initial PHASE is specified in radians where one complete cycle of the signal (i.e. the distance between the impulses) is 2 Pi radians (see diagram below).

Inputs Meaning Sample 1-D frame $\ge$2-D frame
No inputs

Outputs Meaning
out1 generated signal

Parameters Type Default Meaning
SAMPLE_RATE Float - Number of samples per second
DURATION Float - Duration in seconds of signal to generate
FREQ Float - The frequency of the impulses
AMP Float 1.0 The size of the impulse
PHASE Float 0.0 The initial phase in radians - The first impulse occurs at 2Pi Radians

Figure:
\begin{figure}
\begin{center}
\psfig {figure=graphics/impulsewave.eps,width=0.9\columnwidth}\end{center}\vspace{-4mm}
\end{figure}



Documentation for CTKv1.1.4 - Last modified: Thu Jun 28 14:39:34 BST 2001