AD/DA conversion

What is the sampling frequency of a music CD?

  1. A44.1 kHz
  2. B8 kHz
  3. C1 MHz
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Answer: A. 44.1 kHz

Music CDs record audio at a sampling frequency of 44.1 kHz with 16 bits. Because this is more than twice the roughly 20 kHz upper limit of human hearing, the sampling theorem allows audible sound to be reproduced. 8 kHz has been used for telephone speech.

  • A. Correct. CDs sample at 44.1 kHz.
  • B. 8 kHz is used for telephone speech and is too low for music.
  • C. 1 MHz is far higher than the CD standard.
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More AD/DA conversion questions

  1. Which correctly describes the integral nonlinearity (INL) of an AD converter?
  2. Which correctly describes the gain error of an AD converter?
  3. What does it mean for a DA converter to be monotonic?
  4. What is the drawback of a binary-weighted resistor DAC, which assigns a different resistor (R, 2R, 4R, ...) to each bit?
  5. How many comparators does a 3-bit flash AD converter need?