EE 105 Lecture 9-24-13 SG11

Burst after which each of the harmonics decay at a

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Unformatted text preview: n 1 hour essentially represents an infinite limit Quasiperiodic signals • Example: Random noise • Example: Single pulse • Speech => Fundamental oscillations that are fairly periodic • • • • • Guitar chord => Instantaneous initial burst, after which each of the harmonics decay at a different rate dynamic timbre o Terms o Periodic comes from temporal period (T) Increment of time for each repeating fundamental shape (equivalent points on waveform) o Frequency (f, F) Cycles (period) per second, for instance => fundamental frequency (in Hz 1 Hz = 1 cycle per sec) f = 1/T Oscilloscope o Electronic device that displays electrical signals as a function of time o Can input two electrical signals, and play one against the other o Can graph a time varying signal o Display a waveform and determine (quantitatively) the amplitude, frequency period, and phase Pendulum o Oscillates back and forth Every sinusoidal signal derives from some form of an oscillator o Attach graph paper and advance it with time If we know the rate of motion of the graph paper, we know the time Resulting graph of pendulum oscillation looks like a sine function expressed as a function of time Friction => dampens signal • Can see rate of decay – damping properties Sine function review o Derived from unit circle o Think of any point on the graph as an...
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