Class: 9/1/2010

The following were discussed in class today.

• Homework assignment 1 and Lab assignment 1 will be due next week, not this Friday.
• Discussed the differences between sin/cosine/complex exponential functions in continuous time and discrete time.
• DT frequencies are limited to the fundamental range -1/2 <= f < 1/2.
• Sinusoids are periodic when the frequencies are rational.
• The "envelope" of a sinusoidal signal appears periodic for any frequency.
• The period of a discrete time sinusoid is not necessarily the reciprocal of the frequency.
• The period is the denominator in f=K/N when the fraction is reduced.
• Aliasing of frequencies outside the fundamental range.
• Sampling of sinusoidal signals.
• Discrete time convolution.  Shift register (delay line) versus circular buffer.
• Designing simple low pass filters.