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Perform the spectral analysis

The code in Listing 12 creates array objects to receive the results and calls the static transform method of the forwardRealToComplex01 class five times in succession to perform the spectral analysis on each of the five sinusoids.

(I will explain the transform method that performs the spectral analysis shortly.)

Only the magnitude data is displayed by this program. Therefore, the arrays that receive the other spectral analysis results from the transform method arediscarded each time a new spectral analysis is performed.

Listing 12. Perform the spectral analysis.
magnitude1 = new double[len];real = new double[len];imag = new double[len];angle = new double[len];ForwardRealToComplex01.transform(data1,real, imag,angle,magnitude1,zeroTime,lowF,highF);magnitude2 = new double[len];real = new double[len];imag = new double[len];angle = new double[len];ForwardRealToComplex01.transform(data2,real, imag,angle,magnitude2,zeroTime,lowF,highF);magnitude3 = new double[len];real = new double[len];imag = new double[len];angle = new double[len];ForwardRealToComplex01.transform(data3,real, imag,angle,magnitude3,zeroTime,lowF,highF);magnitude4 = new double[len];real = new double[len];imag = new double[len];angle = new double[len];ForwardRealToComplex01.transform(data4,real, imag,angle,magnitude4,zeroTime,lowF,highF);magnitude5 = new double[len];real = new double[len];imag = new double[len];angle = new double[len];ForwardRealToComplex01.transform(data5,real, imag,angle,magnitude5,zeroTime,lowF,highF);}//end constructor

The spectral magnitude results

Note that the magnitude results are saved in the array objects referred to by magnitude1 , magnitude2 , etc. This will be important later when I discuss the interface methods defined by Dsp028 .

The end of the constructor

Listing 12 also signals the end of the constructor. When the constructor terminates, the object has been instantiated and populated with spectralanalysis results for five sinusoids using the parameters specified by the file named Dsp028.tx t.

The getparameters method

The getParameters method used in this program is the same as that used in Dsp029 , so I won't discuss it further.

The interface methods

The Dsp028 class must define the same six interface methods as the Dsp029 class, which I discussed earlier. The only difference in the interface methods is the identification of the array objectsfrom which the methods return data when the methods are called.

The code in Listing 13 is typical of the code for methods f1 through f5 . As you can see, these methods return the data stored in the magnitude arrays. These are the spectral analysis results that areplotted in Figure 9 , Figure 11 , and later in Figure 14 .

Listing 13. The method named f1.
public double f1(double x){ int index = (int)Math.round(x);if(index<0 || index>magnitude1.length-1){ return 0;}else{ return magnitude1[index]; }//end else}//end function

The program named Graph03

The plots in Figure 9 and Figure 11 were produced by entering the following at the command line prompt:

Questions & Answers

what is Nano technology ?
Bob Reply
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Is there any normative that regulates the use of silver nanoparticles?
Damian Reply
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Stoney Reply
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Adin Reply
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Damian Reply
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Praveena Reply
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Damian Reply
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s. Reply
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Devang Reply
are you nano engineer ?
fullerene is a bucky ball aka Carbon 60 molecule. It was name by the architect Fuller. He design the geodesic dome. it resembles a soccer ball.
what is the actual application of fullerenes nowadays?
That is a great question Damian. best way to answer that question is to Google it. there are hundreds of applications for buck minister fullerenes, from medical to aerospace. you can also find plenty of research papers that will give you great detail on the potential applications of fullerenes.
what is the Synthesis, properties,and applications of carbon nano chemistry
Abhijith Reply
Mostly, they use nano carbon for electronics and for materials to be strengthened.
is Bucky paper clear?
carbon nanotubes has various application in fuel cells membrane, current research on cancer drug,and in electronics MEMS and NEMS etc
so some one know about replacing silicon atom with phosphorous in semiconductors device?
s. Reply
Yeah, it is a pain to say the least. You basically have to heat the substarte up to around 1000 degrees celcius then pass phosphene gas over top of it, which is explosive and toxic by the way, under very low pressure.
Do you know which machine is used to that process?
how to fabricate graphene ink ?
for screen printed electrodes ?
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s. Reply
of graphene you mean?
or in general
in general
Graphene has a hexagonal structure
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