Technical data

ASTi ACE Studio Components Reference Guide Rev. M DOC-01-TELAS-CRG-4

2.21. PulseStream

Summary: The Pulse Stream signal source is a sophisticated signal source which

generates a stream of pulses. Like the Pulse signal, the pulses have an amplitude

between 0 and 1.

Description: The pulse stream is typically used to frequency or amplitude

modulate other signals, to provide time varying tones. In the Pulse Stream Signal

figure shown below the pulse width and PRI (Pulse Repetition Interval) are shown.

The PRI is usually the Main PRI modulated by some other signal or function. There

are several ways to modulate the timing between pulses. These different

modulation methods are called Pulse types, and are specified in the Pulse Type

field. Each Pulse type has a number from 1 to 255 and a name. For each pulse type,

some of the parameters are ignored. See the PulseType table to see which pulse

types use which parameters.

Figure 7: Pulse Stream Signal

The Signal Modulated figure below shows how the first few Pulse Types work. The

graph shows the PRI (Pulse Repetition Interval) as a function of time. The specific

example is a triangle modulated pulse stream (Pulse type 3, Triangle.) Built into the

object are sine, triangle, sawtooth and square wave modulations. You can also use

an arbitrary signal to modulate the PRI by selecting Pulse Type 9 (external) and

entering a signal in the PRI Modulation field. For the built-in modulation signals,

you need to specify a modulation frequency and modulation depth. For the external

pulse type, the modulation frequency is ignored and the modulation depth becomes

a scale factor for the external modulation signal.

Figure 8: Signal Modulated