Sony S530D manual Video and Audio Processing, ARP2

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

Name	IC	Audio		Purpose
		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	∙	16 to 8 bit Demodulation
		(both)	∙	Descrambles the main data using
				external memory IC304
			∙	Generates bit clock
Decoder	IC401	A/V		Video
		(both)	∙	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
DSP	IC501	A	∙	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
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