Philips VE8 Service Manual page 127

EN 128 9. Q529.1A LA
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.
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.).
Demodulation & Decoding DSP is used for demodulation and
decoding of all analogue terrestrial TV sound standards that
the TV520 platform covers.
The Audio Post-Processing DSP supports DPLII together with
volume and tone control, spatializers, and equalizers for 6
channels (max.)
Circuit Descriptions, Abbreviation List, and IC Data Sheets
xx
Figure 9-7 PNX85xx audio flow diagram
9.5.3
2
S
H_16770_125.eps
Digital Audio Decoder DSP is used to decode digital
compressed streams such as MPEG and AC-3. This runs as
SW Codecs on the AV-DSP.
Control and Compute Subsystem
Refer to figure "Control and compute subsystem" for a
clarification of the blocks that are used in this device.
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