ptolemy.math
Class SignalProcessing.SinusoidSampleGenerator

java.lang.Object
  ptolemy.math.SignalProcessing.SinusoidSampleGenerator

All Implemented Interfaces:

DoubleUnaryOperation

Enclosing class:

SignalProcessing

public static class SignalProcessing.SinusoidSampleGenerator
extends java.lang.Object
implements DoubleUnaryOperation

This class generates samples of a sinusoidal wave. The function computed is :

  h(t) = cos(frequency * t + phase)
  

where the argument is taken to be in radians.

To use this class to generate a sine wave, simply set the phase to -Math.PI*0.5 from the phase, since sin(t) = cos(t - PI/2).

Field Summary

private double	_frequency
private double	_phase

Constructor Summary

SignalProcessing.SinusoidSampleGenerator(double frequency, double phase)
Construct a SinusoidSampleGenerator.

Method Summary

double

operate(double time) Operate on the operand, returning a value of the same type.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

_frequency

private final double _frequency

_phase

private final double _phase

Constructor Detail

SignalProcessing.SinusoidSampleGenerator

public SignalProcessing.SinusoidSampleGenerator(double frequency,
                                                double phase)

Construct a SinusoidSampleGenerator.

Parameters:

frequency - The frequency of the cosine wave, in radians per unit time.

phase - The phase shift, in radians.

Method Detail

operate

public final double operate(double time)

Description copied from interface: DoubleUnaryOperation

Operate on the operand, returning a value of the same type.

Specified by:

operate in interface DoubleUnaryOperation

Parameters:

time - The operand.

Returns:

The results of the operation.