9.1. Conventional Shockproofing Technique
(LCD Display:
)
Input information read out of the CD at double speed is demodulated, stored in the memory, and
while sound-marking signal is supplied at normal speed from the memory to the D/A converter,
the residual data is accumulated in the memory.
If reaccess to the break point is accomplished before the memory becomes empty, apparent
playback sound is entirely kept free from breaking even when information pauses due to
vibration, etc. It was necessary to use the 16M bit memory for securingthe accumulation time of
about 10 seconds.
9.2. Compression-shockproofing [Outline]
(LCD Display:
)
Fig.5
is a block diagram showing the compression-shockproofing mechanism, the difference of
which from the conventional mechanism is as follows: Input information read out at double
speed undergoes datacompression (16 bits -- 4 bits) by the encoder in the ADPCM (Adaptive
Difference PCM) and stored in the external memory; the stored memory information undergoes
data elongation (4 bits -- 16 bits) by the decoder in the ADPCM and supplied at normalspeed to
the D/A converter.
The data compression technique has conduced to reduction of required memory capacity from
16M bits to 4M bits for securing the accumulation time equivalent to the conventional.
Fig.5
10. Schematic Diagram Note
10.1. Type Illustration of IC's, Transistors and Diodes
10.2. Schematic Diagram Notes
Notes:
- S201: Laser ON/OFF switch in “OFF” position.
(It turns “ON” with disc holder closed.)
- S202: Rest detector in “OFF” position.
(It turns “ON” when optical pickup comes to innermost
periphery.)
- S309: Play mode selector (MODE) in “NORMAL” position.
(RESUME
RANDOM
NORMAL)
- S310: Hold (HOLD) switch in “OFF” position.
- S801: Play/pause (
) switch.
18
Summary of Contents for SLCT570 - PORT. CD PLAYER
Page 7: ...5 Operation Checks and Component Replacement Procedures 7 ...
Page 8: ...8 ...
Page 9: ...9 ...
Page 10: ...10 ...
Page 11: ...11 ...
Page 37: ...P1 RPK1332 PACKING CASE S 1 S GH 37 ...
Page 41: ...17 Packaging 41 ...