Flashcards on Analog-Digital Conversion and DSP Basics
Analog-Digital Conversion and DSP Basics: A Student's Guide
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Data Conversion
54 cards
Card 1
Question: What is a single-bit ADC/DAC and where are they commonly used?
Answer: A converter using one bit per sample, used in telecommunications and music reproduction; often implemented with multirate techniques.
Card 2
Question: What tradeoff is fundamental to single-bit (delta) data conversion?
Answer: A higher sampling rate is traded for a lower number of bits (single-bit quantization).
Card 3
Question: What basic circuit is most single-bit ADC/DAC implementations based on?
Answer: They are mostly based on the use of a delta modulation circuit (delta modulator).
Card 4
Question: In a delta modulator, what does the comparator decide?
Answer: The comparator decides whether the incoming analog signal or the capacitor (feedback) voltage has greater voltage, producing a 1 or 0.
Card 5
Question: What is the role of the latch in a delta modulation circuit?
Answer: The latch synchronizes the digital output with the clock, thereby defining the sampling rate.
Card 6
Question: How does the feedback loop in a delta modulator operate?
Answer: The digital output is fed back to drive an electronic switch that connects the capacitor to a positive or negative charge injector depending on the bi
Card 7
Question: What happens to the capacitor when the output bit is 1 versus 0 in delta modulation?
Answer: Output = 1 connects the capacitor to a positive charge injector (increasing capacitor voltage); output = 0 connects it to a negative injector (decreas
Card 8
Question: How does the delta modulator output reflect the slope of the analog input?
Answer: If the input is increasing, the output has more 1s; if decreasing, more 0s; if constant, the output alternates equally. The relative number of 1s vs 0
Card 9
Question: What limitation arises from delta modulation relating to slew rate, quantization size, and data rate?
Answer: There is an unavoidable tradeoff: maximum slew rate, quantization size, and data rate. Adjusting slew rate and quantization for voice leads to very hi
Card 10
Question: What is a key advantage of delta modulation for transmission/storage?
Answer: All bits have the same meaning (no start/stop/LSB/MSB framing), and the receiver circuit can be identical to the transmitter feedback to reconstruct t