System Block Diagram; Audio Output - Hitachi DV-P345E Service Manual

2.1 SYSTEM BLOCK DIAGRAM

A sample system block diagram for the MT1379 DVD player board design is shown in the
following figure:
3. A O
UDIO UTPUT
The ZR36768 supports two-channel to eight-channel analog audio output. This version has two-
channel output.
The ZR36768 also provides digital output in S/PDIF format. The board supports both optical and
coaxial SPDIF outputs.
4. A DAC
UDIO S
The ZR36768 supports several variations of an I
lines and three clock lines. The I
audio DAC to generate analog audio output.
The two-channel DAC is a Cirrus Logic CS4392. The DACs support up to 192kHz sampling rate.
The outputs of the DACs are differential, not single ended so a buffering circuit is required. The
buffer circuit use a National LM833 op-amp to perform the low-pass filtering and the buffering.
5 .VPU - V P
IDEO ROCESSING
The VPU is responsible for all video output processing and timing. It outputs 8 bit (CCIR 656
type) digital interlaced video and separate syncs. It can also output interlaced composite, S- or
component analog video, or progressive components analog video.
The VPU units have two operating modes: Interlaced when the output is interlaced and
Progressive when the output is progressive. A two fields Deinterlacer can be used (as needed)
for the decoded image.
The VPU has a sync generator and output unit. The sync signals are used by the sync receiver
unit to generate all video timing for all other VPU units and timing signals for the CPU and PDU.
2
S type bus. The I
2
S data and clock lines can be connected directly to one or more
U
NIT
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2
S format uses four stereo data