ViewSonic N2752w-1M, Service Manual

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D. Audio
MT8202 incorporates a on-chip audio processor decodes whole world standard audio signals
from tuner with lip sync control, delivering high quality post-processed sound effect to
customers. Audio interface accept analog audio signal from Tuner, e.g. SIF or AF. It also
includes preprocessing circuit to filter the noisy audio signals. Audio decoder will decode the
BTSC, and output best sound with enhanced 3D surround post-processing.
The AD12250 converts stereo single-ended analog input signals into 24-bit I2S digital audio
data through on-chip anti-aliasing filter, multi-bit
Σ
-
Δ
modulator, decimation filter and
high-pass filter which removes dc offsets. External analog audio signal , such as AV, S-video,
etc. is directly fed into AD12250 via a audio switch and converted to I2S digital audio data.
Digital audio, such as HDMI and DTV, have decoded by MT5351 and MT8293, is converted
to I2S digital audio already. The I2S digital audio data is decoded and processed by MT8202,
and then be delivered to AD8256 for audio amplifying.
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