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

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

Outputs Meaning

out1 generated signal

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

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