Audio Subsystem; Pnx8535 Audio Flow Diagram - Philips Q528.1E Service Manual

Circuit Descriptions, Abbreviation List, and IC Data Sheets
The Video Composition Pipe TV (CPIPE_L2TV) is used to
perform picture improvements on video and merge the video
layer and 2 graphics layers into a single stream.
The Flat Panel DIsplay-LVDS (FPD-LVDS) provides a serial
interface for 10-bit RGB output data towards the LCD panel
with a data rate of 90 Mpixels/s max.
The Memory Based Video Processor VO (MBVP_2LVO) is
used on the main video channel for scaling of images for
monitor out.
The Analogue Audio Front-End Input (AAFE) block is used to
capture Baseband Audio Inputs.
The Sony/Philips Digital Interface (SPDIF) input is used to get
compressed data into the system memory. The multiplexer in
front of the block allows two possible sources of SPDIF signals.
The SPDIF Output is used to generate either PCM data or a
compliant IEC-61937 compressed stream containing MPEG/
Dolby Digital format.
9.6.2
Figure 9-11 PNX8535 audio flow diagram
Q528.1E LA
The Video Composition Pipe VO (CPIPE_VO) is used to merge
a video and a graphics layer into a single stream together with
insertion of VBI and CGMS data.
The Digital Encoder (DENC) supports encoding of a digital
video stream from the CPIPE_VO into Analogue CVBS or Y/C.

Audio Subsystem

Refer to figure "Audio flow diagram" for a clarification of the
blocks that are used in this device.
The Audio Input (AI) block is used to transfer stereo audio (I
channel) from the Audio DSP into the system memory for "lip-
sync" delay.
The Audio Output (AO) block supports output of up to four
2
stereo I S channels. The AO is used to transfer data from the
system memory to the Audio DSP, for post processing of the
signal at a sampling frequency of 48 kHz (max.).
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