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Dual A/D converter circuit overview
For each input circuit, the M4 has two A/D converters with different input gains. This design enables
high-quality audio recording without the need to adjust gain settings, a step that normally had been
indispensable.
Providing amazing dynamic range
By combining two A/D converters, a wide dynamic range not possible with a single A/D converter has been
realized.
・Airplane
・Nearby thunder
・Train passing on tracks overhead
・Inside train
・Shouting
・Grand piano
・Noisy street
・Chimes
・Ordinary conversation
・Whispering
・Quiet library
・Late night in suburb
Conventional equipment
Input gain adjusted to
desired recording volume
6
Dual AD converters
Low-gain
AD converter
AD converter
switches in
response to
input level
High-gain
AD converter
Wide dynamic range covered
by two AD converters
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