Basic file organization technique"
before the computer, most information wis stored in paper form
when we needed information, we used to search through the papers
if we knew a date or category of the information we were
searching for, we would go to that section in the papers.
when we wanted to update or delete some data we searched
for it and modified them or struck them off. if the
data is limited, then all these tasks are easy. but imagine
libaray information, information about a student in a school, or
banking system data. how do we search for specific
required data in papers? it can be a never-ending task !
computers solve this problem, besearch the evolution
of file system data processing
discuss the evolution of file septem data processing and how it
is to understanding of the data access limitations that
databases atempt to overcome. also include your understanding
of data and information

Now you’re on your own. include a short summary of this section with plots in your lab report. write a matlab script file to do steps (a) through (d) below. include a listing of the script file with your report. 1 the soundsc(xx,fs) function requires two arguments: the first one (xx) contains the vector of data to be played, the second argument (fs) is the sampling rate for playing the samples. in addition, soundsc(xx,fs) does automatic scaling and then calls sound(xx,fs) to actually play the signal. mcclellan, schafer, and yoder, dsp first, 2e, isbn 0-13-065562-7. prentice hall, upper saddle river, nj 07458. c 2015 pearson education, inc. 4 mcclellan, schafer and yoder, signal processing first. prentice hall, upper saddle river, new jersey, 2003. c 2003 prentice hall. (a) generate a time vector (tt) to cover a range of t that will exhibit approximately two cycles of the 4000 hz sinusoids defined in the next part, part (b). use a definition for tt similar to part 2.2(d). if we use t to denote the period of the sinusoids, define the starting time of the vector tt to be equal to t , and the ending time as ct . then the two cycles will include t d 0. finally, make sure that you have at least 25 samples per period of the sinusoidal wave. in other words, when you use the colon operator to define the time vector, make the increment small enough to generate 25 samples per period. (b) generate two 4000 hz sinusoids with arbitrary amplitude and time-shift. x1.t / d a1 cos.2