Pioneer PDR-509 Manuale di servizio - Pagina 32

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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

DGAI

D8CM

−

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