User:KSUSHABABY
From MariachiWiki
Xenia Rudenko
Hi! I'm a freshman at Stony Brook University and am having a great year! I am currently undecided as to what I want to be, but I will most likely end up in a science or math major. This semester I am taking bio and bio lab, chem, english and this WISE course. I'm in the radio signal section right now and am learning all about cosmic rays and radio signals.
I grew up in Cooperstown, NY and graduated with the class of 2007 from Cooperstown High School. My favorite part about Cooperstown is the lake, in which I pretty much spend my entire summer! I love sailing and swimming and just laying in the sun. During the school year I ran cross country and was captain my senior year. I also was on the quiz team my junior and senior year, and science olympiad freshman through junior year (I was captain as a junior.) I've played the piano since I was 3 and the violin since i was 4 and have always been very involved in music. Throughout high school I was able to accompany the concert choir and prepared many Guild Audition pieces and NYSSMA solos. I also looovve newer music! I listen to almost anything and love finding new bands! My favorite TV shows are LOST!!, Planet Earth, Gossip Girl, Desperate Housewives, and Sex in the City. My favorite movie is Stardust!
I worked for 4 years in a clothing store through high school which was by far one of the best jobs ever! The store was called Metro Fashion and was a local boutique with wonderful girls and an amazing boss. I love travelling around, and have been all around the US, and then to Russia, Paris, Egypt, Israel, Mexico, and most recently Puerto Rico!
i am a facebook-addict so check out my page!
Mariachi Lab
Day 1-- Today we got a basic intro to the mariachi lab. Cosmic Rays: a high energy particle which comes from outside the atmosphere
signal processing tasks: 1-detection, 2-estimation, 3-classification
UHECR= Ultra-High Energy Cosmic Rays
antenna:device that transmits/recieves electromagnetic waves, converts into electromagnetic waves
Day 2--
I. omni-directional: radiates equally in all directions
II. directional: radiates more in one direction (horizontally or vertically) than another
reciever: electronic circuit that reieves a radio signal from an antenna and converts the signal into sound, picture, GPS, etc.
Day 3-- Today we started working with the computers in the back. We used a program called speclab to try to catch radio signals that Stony Brook was recieving. After testin out the different buttons to see how they affected the frequency and amplitude, we went into WinRadio and found an actual station. The best we could get were only stations that were playing very staticky music, but we were able to record a 10 second clip which we saved under our names in the lab. I don't know what we'll be doing with these yet.
Day 4-- We started using the program Matlab today. I've used the program once in a summer program I did two summers back, and really hated the program back then. Today it wasn't too bad...we did a lot of basic stuff, such as learning how to define variables and entering arrays to create a vector. Then we learned how to graph the data onto an xy plot. The graphs showed us a visual interpretation of the radio waves, and depending on how we changed the variable, the graph shown was altered.
Day 5 -- We started generating signals in matlab today. We started off by doing what we did last peio with creating an array from 0 to 1 with a step of 0.01 ( 0:0.01:1). Then we plotted the sinosoid signal y(t)=sin(2pi*ft) where f was equal to 2. As we altered the frequency and step size we were able to see how the numbers affected the graphs created. When we made the frequency very high and step size very small there were so many periods that the graph just looked black and we could not distinguish teh serperate sinosoids. Next we were able to listen to the sounds through a headset. Again we altered the frequency to see how the pitch and signal length was affected. WHile I was very interested in matlab today, I felt confused by a lot of the things we were doing.
Day 6-- Today in Mariachi lab we worked with the GUI in matlab. We were able to use it to study the time and frequency representations of sound signals.
time domain--> analysis of math functions or of physical signals with respect to time
function domain--> analysis of math functions or of physical signals with respect to frequency
fourier transfor--transforms one function into another, used to go between time and frequency functions
The GUI let us use buttons, sliders, text fields and menus to verify signals generated from the radio signal we previously recorded. We could load and play signals with our designated parameters such as time and tone. Then we looked at the plots which the signals created. Our final plot looked like :
Final Project
For the first part of the the project we looked at the difference between a signal power in decibel and the signal power not in decibel. The non-dB graph had many more peaks and showed a smaller amplitude variation. The dB graph had far less peaks but showed a much larger amplitude variation. We then went to task 2 which was detection. We changed the threshold so it was 10^6 times bigger than the noise was. We used matlab to mark every signal power/threshold pair with either a 1 (if sp>th) or a 0 (if th>sp). These numbers were plotted. It took us several attempts to make get the entry to work as originally we were only getting just zeros or just ones. In the 5 minutes we recorded 40 events. The graphs we created were:
The next day we were in mariachi lab our task was to take every lone 0 in the sequence and change it into a 1. Basically we were converting the 101 segments into 111. Again we graphed the indicators against teh time and got:
