A/V Processing Block - Sony DVP S530D Training Manual

Audio/Video Processing Block
The RF / eye pattern signal is processed by several blocks to recover the
audio and video signal that is output the rear panel.
Optical Device
The optical device contains an active amplifier and matrix to produce a
low noise RF or eye pattern signal from the A-H detector's signals. The
RF and A-H detector signals are all input to the RF amplifier IC001.
RF Amplifier IC001
The RF signal is amplified when small, and limited when large, to equalize
the eye pattern signal that is applied to the next A/V stage. The A-H
detector signals are matrixed in the RF amplifier to produce servo signals
like focus error (FE), tracking error (TE), track zero crossing (TZC) and PI
and Mirror signals for disc identification. These signals go to the servo IC.
ARP2 IC303
The Advanced RF Processor (ARP2) IC303 receives the analog eye pat-
tern data and first converts it into a digital waveform by "slicing" it across
the middle. A voltage above the middle becomes a HIGH output and a
voltage below becomes a LOW voltage. The HIGH and LOW voltage
begin their digital journey within IC303. To support the digital signal a
clock is made from the input signal.
How successful the data locks to the internal PLL to make this clock can
be monitored at the JITTER pin 57 of IC303. A low voltage proves a lock.
This means the servos are OK and the signal processing is OK to this
point. A high voltage means the input eye pattern should be examined
again. A clear (no noise) signal means the servos are OK and the disc
signal is incorrect or IC303 is not able to lock onto the input signal (IC303
or its support parts are defective).
Additional signal processing within IC303 unscrambles the digital data
and channels the CD and DVD data into separate output ports. Both
outputs are fed to separate A/V Decoder IC401 inputs.
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A/V Decoder IC401
The CD and DVD input signals undergo separate processing. The CD
audio is virtually untouched and leaves the IC in the audio processing
path to IC501.
The DVD video signal is MPEG decompressed using two external SDRAM
ICs (not shown) for momentary storage during the processing. The
subpicture (subtitle and DVD disc menu) pieces of data are loaded into
memory and when called for, added into the main picture. The digital
information is returned to analog form by the internal D/A converter. The
DVD player's menu is added as an on screen display (OSD) just before
the analog video leaves IC401.
The DVD audio signal is also MPEG decompressed and the PCM is ex-
tracted to take the route out of IC401 through IC501 and IC902 for the
analog audio processing. Dolby digital AC-3 decompression takes place
in this IC401 using the two external SDRAMs (not shown) that are also
used for video decompression. IC401 first recognizes the 5.1 channel
AC-3 or DTS data and informs Syscon IC202.
Audio DSP IC501
IC501 Audio Processing
CD
Rear channel delay Rear channel delay
(Digital Cinema (Digital Cinema
Sound / VES) Sound / VES)
Dolby Prologic Dolby Prologic
Decoding Decoding
Dolby Surround Adds DTS flag to the
digital output
The outputs are digital signals to the rear panel coax and optical ports and
digital signals to the D/A converters IC902, IC905-7.
D/A Converters
IC902 receives the digital signals for the analog L/R channels. The re-
mainder of the converters, IC905-7, is used for the 5.1 channel digital
conversion to analog signals.
DVD DVD with AC-3
Pass through of the
5.1 channel AC-3
signal
Downmixing of 5.1
channel AC-3 to 2
channels.
Signal balancing
Test tone generation