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Marantz
Technical Service Manual
12-1 HDMI Block Diagram
- Audio, video and auxiliary data is transmitted across the three TMDS data channels.
The video pixel clock is transmitted on the TMDS clock channel and is used by the
receiver
as a frequency reference for data recovery on the three TMDS data channels.
- Video data is carried as a series of 24-bit pixels on the three TMDS data channels.
TMDS encoding converts the 8 bits per channel into the 10 bit DC-balanced, transition
minimized
sequence which is then transmitted serially across the pair at a rate of 10 bits per pixel
clock period.
- Video pixel rates can range from 25MHz to 165MHz. Video formats with rates below
25MHz
can be transmitted using a pixel-repetition scheme. The video pixels can be encoded in
either RGB,
YC
B
C
R
4:4:4 or YC
B
C
R
4:2:2 formats. In all three cases, up to 24 bits per pixel can be
transferred.
- Basic audio functionality consists of a single IEC 60958 audio stream at sample rates of
32kHz, 44.1kHz
or 48kHz. This can accommodate any normal stereo stream. Optionally, HDMI can carry a
single such
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