Data Sheet

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352. ADC Converter
Replace the switch (62) with the reed switch (83) in project #347. Hold
the magnet (7) near the reed switch (83) for a while and you will hear
the siren in soft volume. This is because the 100W resistor (41) limits
the current through the speaker (93). Move the magnet (7) away from
the reed switch (83) and wait for a while. You will eventually hear the
siren start breaking up and fading out.
An Analog to Digital Converter (ADC) is a system that performs the
processes of sampling, quantization and encoding to convert and analog
signal to a digital bit stream.
353. DAC Converter
Connect points C and D with the 1kW resistor (42) in project #352.
Hold the magnet (7) near the reed switch (83) for a while and you will
hear gun shots in soft volume. This is because the 100W resistor (41)
limits the current through the speaker (93). Move the magnet (7) away
from the reed switch (83) and wait for a while. You will eventually hear
the gun shots start breaking up and fading out.
A Digital to Analog Converter (DAC) is a system that performs the
process of interpolating and ltering of the digital samples to recreate
the analog signal.
354. Quantization Error
Connect points A and B with the 4-wire (4) in project #352. Hold the
magnet (7) near the reed switch (83) for a while and you will hear the
re siren in soft volume. This is because the 100W resistor (41) limits
the current through the speaker (93). Move the magnet (7) away from
the reed switch (83) and wait for a while. You will eventually hear the re
siren start breaking up and fading out.
Looking back at the gure in project #350, it can be seen that the
samples don’t always line up exactly with a level and thus the closest
level for each sample is chosen to represent the quantized version of
that sample. The difference between the actual sample value and its
quantized approximation is the quantization error.
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