CX-893
2) Signal processing part3) Shock proof controlling part
Figure 11 shows the block diagram of signalThe data from the signal processing part is temporarily
processing, shock proof controlling and ATRAC parts.stored in DRAM (IC202). Later, the data will be sent out
The signal processing part consists of the two blocks,sequentially by the data requests from the subsequent
one of which demodulates the music data on the discATRAC part or instructions from the microprocessor.
and corrects errors, and the other of which controls
addresses used for searches and time calculation.This mechanical module contains the 4MB DRAM and
can store the data of approximately 10 seconds.
2.1) Music data
The signal input from EFMI (3 pin) is equalized with the4) ATRAC part
digital filter after analog-digital conversion. This signalThe data from DRAM (IC202) will be extended for
can be monitored with EFMO (1 pin). The signal will beATRAC at this block and then converted into the audio
sliced at an appropriate level and modulated to 0 and 1data.
signal and then transmitted to the subsequent shockThe data formats to be used at the subsequent DAC
proof part after EFM demodulation and error correction(IC501) are as follows:
are completed.BCLK (71 pin): 64 Fs
DADATA (74 pin): 20 bits from the last
2.2) Address controlDFCK (72 pin): 256 Fs
Reads the address data on the disc and specifies targetsLRCK (70 pin): Fs, L/R
for time control during play and searches. The*Fs=44.1 kHz
methods of reading the address data depends on the
disc types.
When you use a Premaster DISC
Extracts the address data from the music data after
error correction is completed.
When you use a Recordable DISC
Modulates frequency of the signal input from WBI (11
pin) and reads the addresses from the data.
Fig.11
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ACEC
PIONEER
