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Today C/C++: .h/.cpp; compiling and linking Fourier Transform (corrected) Nyquist Theorem Audio sampling rates
SE-2811Slide design: Dr. Mark L. Hornick
Content: Dr. HornickErrors: Dr. Yoder
1
SE3910Week 6, Class 1
Ex: C/C++ (Review)
Why do we have both .h and .cpp file extensions for C++? Why not just have .cpp (like .java for Java classes)?
Answer these questions:
1. What should you put into a class’s .h file?
2. What should you put into a class’s .cpp file?
[Note: On next lab, use .hpp and .cpp instead of .h and .cpp]
SE-2811Dr.Yoder 2
Compiling and Linking
Compiling Converting individual .c or .cpp file to object code
Linking Combining multiple object (.o) files into an
excecutable (usually without extension, or .exe on Windows)
SE-2811Dr.Yoder 3
Ex: C/C++
Circle the link-time errors. Box the compile-time syntax error warning: implicit declaration of function `...' point.m:40: error: ‘mypoint’ undeclared (first use in
this function) parse error before `...‘ collect2: ld returned 1 exit status undefined reference to `filterText' /usr/lib/crt1.o(.text+0x18): undefined reference to
`main 'SE-2811Dr.Yoder 4
Network Latency with resmon.exe
SE-2811Dr.Yoder 5
Signals as sums of sine-waves
SE-3910 - Dr. Josiah YoderSlide style: Dr. Hornick
Much Material: Dr. Schilling
6http://mathworld.wolfram.com/FourierSeriesSquareWave.html
http://ccn.ucla.edu/BMCweb/SharedCode/slides/SlideFiles.html
SE-3910 - Dr. Josiah YoderSlide style: Dr. Hornick
Much Material: Dr. Schilling7
Sampling Theorem (again Nyquist)
fs = 2B (B is bandwidth of signal)
SE-3910 - Dr. Josiah YoderSlide style: Dr. Hornick
Much Material: Dr. Schilling8
Ex: If this is 1 second,what is the output if we sample 3 times per second?
SE-3910 - Dr. Josiah YoderSlide style: Dr. Hornick
Much Material: Dr. Schilling9
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Units: dB
What is a decibel?
A tenth of a bel
What is a bel?
The log10 of some ratio.
X dB = 10 log10 (Y)
Ex: How to compute Y from X?
X – in units of dB
Y – simple ratio (unitless) e.g. signal power / noise power 10
In-class Activity: Analog to digital bandwidth
Suppose you would like to send video in a (relatively) low-frequency with a narrow bandwidth of 1 Mhz
The connection is fairly noisy and you can only get 20dB SNR
What bit-rate can you achieve?
SE-3910 - Dr. Josiah YoderSlide style: Dr. Hornick
Much Material: Dr. Schilling
11
Ex:
What are two ways we can avoid the stroboscopic effect in a video game simulation of a rotating wheel?
SE-3910 - Dr. Josiah YoderSlide style: Dr. Hornick
Much Material: Dr. Schilling12
Muddiest Point
Wait for the slides, or follow this link to answer both questions at once: http://bit.ly/1Mow5a3
SE-2811Dr.Yoder 13
Muddiest Point
Wait for the slides, or follow this link to answer both questions at once: http://bit.ly/1Mow5a3
SE-2811Dr.Yoder 14
SE-2811Dr. Josiah Yoder 15
http://bit.ly/1Mow5a3
SE-2811Dr. Josiah Yoder 16
http://bit.ly/1Mow5a3
References
EB: Derek Malloy, Exploring Beaglebone, Wiley, 2015
http://www.linuxtopia.org/online_books/an_introduction_to_gcc/gccintro_95.html
http://www.network-theory.co.uk/docs/gccintro/gccintro_95.html
http://stackoverflow.com/questions/5645387/gcc-compile-errors-in-an-basic-example-objc-program
http://www.linuxtopia.org/online_books/an_introduction_to_gcc/gccintro_94.html
SE-2811Slide design: Dr. Mark L. Hornick
Content: Dr. HornickErrors: Dr. Yoder
17