ECE 4760: Homework 2

The DTMF frequencies vary between 697 and 1477 Hz. According the the DTMF spec:

  1. Given these specifications,
    -- what DDS sample frequency is required? A matlab program which computes spectrum versus number of samples/cycle.
    -- Should you add a low pass filter to the DAC output? If so, what cutoff frequency?
    -- How accurate is the internal PIC32 oscillator? Does it meet the frequency accuracy spec?
    -- What kind of amplitude modulation will you use and why. Linear ramp? Cosine? Exponential?

Copyright Cornell University September 17, 2015