Pioneer PD-6050 Instrukcja serwisowa - Strona 25

Przeglądaj online lub pobierz pdf Instrukcja serwisowa dla Odtwarzacz CD Pioneer PD-6050. Pioneer PD-6050 31 stron.

Fig.4-17

The DC-replayed Envelope signal J is obtained from

the differentia! amplitude of these Peak and Bottom

Hold signals, H and I.

The Mirror output is

obtained by comparing this signal J with the signal

K which has been held at peak level, using a time

constant of a a level that is two-thirds that of the

peak value.

In other words, the Mirror output is

"L" upon a disc track or " H " between disc tracks

(the Mirror section). Moreover, the Mirror output is

also "W

when a defect has been detected.

EFM COMPARATOR

Fig. 4-18

The EFM Comparator functions to convert the RF

the reference voltage of the EFM comparator is

signals into binary signals.

The asymmetry caused

controlled by exploiting the respective 50% proba-

by variance during disc manufacture

cannot be

bility of a 1 or 0 occurring as the value of a

eliminated merely by AC coupling.

Consequently,

binary-coded EFM signal.

2 5