Efm Encoding; Strategy Control; Digital Audio Interface Modulation; Detailed Descriptions Of Output Terminal Control - Pioneer PDR-555RW Service Manual

PDR-555RW, PDR-V500, PDR-19RW, PDR-509

7.7.7 EFM Encoding

Subcode P and Q and the digital audio data from the D-RAM control
block are EFM-modulated.
At the same time, subcodes, sync and a merge bit are added. Then,
it is NRZI-converted and encoded to EFM signals of the CD format.

7.7.8 Strategy Control

Whereas the signal of 3T to 11T (T=231 nsec) is obtained in the
EFM encoder block, the LD power-on time is adjusted in recording
so that the pit length becomes ideal for playback.
Specifically, pulses 3T to 11T are processed for -1T and output as
2T to 10T.
However, the optimum pulse width in recording slightly differs
depending on the disc types. The PDK033A (strategy control IC)
of IC316 performs fine adjustment of this pulse width.
For PDR-509, Strategy control IC becomes IC431 PDK041A.
8. DETAILED DESCRIPTIONS OF OUTPUT TERMINAL
CONTROL
The terminals controlled by the microcomputer are set in each mode as follows:
8.1 DGAI (microcomputer,pin 48) and
D8CM (microcomputer, pin 53)
For PDR-509 :
DGAI (ATIP decoder,pin 56) and
D8CM (ATIP decoder, pin 57)
TERMINAL CONTROL
TEST mode
Normal mode
Not for spindle CLV
For spindle CLV
Playing the outer periphery from
18 minutes in absolute time
Recording on the outer periphery
from 18 minutes in absolute time
CD-R/RW whose program area
is less than thirty minutes
(regarded as an 8-cm disc)
Others
32
DGAI D8CM
L L
L L
−
H
−
H
−
H
L L

7.7.9 Digital Audio Interface Modulation

The digital audio interface modulation block receives signals from
the CD decoder (IC353, CXD2585Q), DIR block (through input),
and A/D converter (IC801, AK5340-VS).
The input signals are converted to the digital audio interface and
output from DITOUT (pin 48). The signals are output in the CP1201
(EIAJ) civilian format.
8.2 AGCON (ATIP decoder, pin 52)
For PDR-509 :
AGCON (ATIP decoder, pin 51)
TERMINAL CONTROL
Recording
Not recording with RF
Not recording without RF
AGCON
L
H
L