Video And Audio Processing - Sony DVP S530D Training Manual

Video and Audio Processing

After the servos have begun, RF data will come from the optical assembly
within the base unit. The "eye pattern" RF data is split into two paths to
provide:
1. Feedback signal to lock the servos; and
2. Video and audio information.
In the A/V processing chain, the RF data is processed by the following
ICs:
9
Audio / Video Processing ICs
Audio
Name IC
or
Video
RF Amp IC001 A/V Matrix the optical outputs to produce
(both) signals for servo and A/V circuits
ARP2 IC303 A/V
(both)
Decoder IC401 A/V
(both)
DSP IC501 A
DAC IC902 A Digital to analog converter for the front
left and right channels
DACs IC905- A 3 Digital to analog converters for the
IC907 six AC-3 channels
Purpose
16 to 8 bit Demodulation
Descrambles the main data using
external memory IC304
Generates bit clock
Video
MPEG decompression using the
external IC402 and IC403
memories
Crops the 16x9 image for a 4x3 TV
picture
Controls spindle motor speed
Sends disc's control and menu
data to IC202
On screen display graphics
D/A Converter (analog video
output)
Audio
MPEG audio decompression
Dolby Digital AC-3 decompression
using external SRAM IC402 /
IC403
Sound enhancements when there
is no AC-3 received (Rear channel
delay)
Downmixing of 6 channel AC-3
into 2 (L/R) channels
Dolby Prologic decoding
Digital coax and optical output
Rear channel delay
Front/rear level balancing
Test tone generation