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The Scientist and Engineer's
Guide to Digital Signal Processing
by Steven W. Smith
California Technical Publishing
ISBN 0-9660176-3-3 (1997)
Chapter 3. ADC and DAC
- Quantization
- The Sampling Theorem
- Digital-to-Analog Conversion
- Analog Filters for Data Conversion
- Selecting the Antialias Filter
- Multirate Data Conversion
- Single Bit Data Conversion
Most of the signals directly encountered in science and engineering are continuous: light
intensity that changes with distance; voltage that varies over time; a chemical reaction
rate that depends on temperature, etc. Analog-to-Digital Conversion (ADC) and
Digital-to-Analog Conversion (DAC) are the processes that allow digital computers to
interact with these everyday signals. Digital information is different from its continuous
counterpart in two important respects: it is sampled, and it is quantized. Both of these
restrict how much information a digital signal can contain. This chapter is about
information management: understanding what information you need to retain, and what
information you can afford to lose. In turn, this dictates the selection of the sampling
frequency, number of bits, and type of analog filtering needed for converting between the
analog and digital realms.
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