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level: Level 1

Questions and Answers List

level questions: Level 1

QuestionAnswer
distribution of quantised noiseuniformly distributed if D small = D^2/12
power of signal1/T x integral(f(t)^2))
abs function in an integral?split into -inf to 0 and 0 to inf
how to draw nyquist diagramgain = radius, phase = theta
impulse response of second order systeme^-at x sinWn as per mechanics databook
step input for 1st order systemgiven by
pole at 0 - bode diagraminitial slope of -20 and sub in value to find gain at a relevant frequency (ie close to where the second turning point is) convert to dB
dualitypage 1 databook
abs function in an integral?split into -inf to 0 and 0 to inf
negative transfer functionsame magnitude, opposite phase
differential form of transfer functiontimes denominator over to the over side and convert so you still have d2x/dx2 etc
definition of dB20log_10(thing) NOT -ve, but 10 if power
multiplication in time domain1/2pi convolution in frequency domain
DFT gives frequencies spaced by 1/T where T is whatTOTAL SAMPLES NOT SAMPLING TIME
AM vs DSB=
transmission rate of constellation in bits per second= log_2(M)/(T per pulse) where M is number of symbols
energy in frequency domain (approx mainlobe) equals what, therefore how to calculate energy of frequency signalequals energy in time domain, NOT with 2pi factor. If integrating the frequency domain to find energy, then divide by 2pi
how to demodulate DSSBtimes by carrier frequency cosine wave. Pass through low pass filter with gain = 2/a where a is attenuation of signal. Cut off = bandwidth of useful signal
signal to noise ratio uses what dB conversion10 not 20