Philips 900 Series - Medical Advice and Precautions

CIRCUIT DESCRIPTION
DCC951
DIGITAL COMPACT CASSETTE RECORDER
TECHNICAL SPECIFICATION
Digital Compact Cassette playback:
Frequency Ranges - 20 Hz - 20 kHz
(fs = 44.1 kHz}
Amplitude Linearity : £0,05dB
S/N ratio (A weighed): > 105 dB (1 kHz)
Dynamic range : 2 100 dB (1 kHz)
THD+N » 2 90 dB (10 kHz;
Channel separation © > 110 dB (1 kHz]
Wow and Flutter: Quartz Crystal Precision
Digital Compact Cassette recordigty(line in):
é ,
Frequency Range © 20 Hz - 20 kH
Sample frequency : 44,1 kHz
Amplitude Linearity : +0,1dB
S/N ratio (A weighed): > 100 dB (1 kHz}
Dynamic range £292 0B (1 kHz}
THD +N : 2 85 dB {1 kHz)
Channel separation : > 300 dB (t kHz)
Digital Compact Cassette recording
: Perfect Digital Recording.
Sample frequencies | 32 kHz (satellite Tuner e.g.)
- 44,tkH2 (CD)
» 48 kHe
Analogue Cassette : Playback only
Frequency Range —: 40 Hz - 16 kHz (CrO,)
S/N ratio (A weighed}: 55 dB (Cr0,)
Dalby B/C ‘Improvement B : 10 dB
Improvement C : 18 dB
Signal aiso supplied to digital outputs
tNPUTS -
Analogue impedance 50kOhm
Digital coaxial ace. to EC 958
Digital optical : TOSLINK
OUTPUTS as
Analogue 2 Vrms
Digital coaxial ‘ace. to IEC 958
HEADPHONE
Load impedance range: 32 - 600 Ohm
Output impedance. 170 Ohm
Output voltage Max. 5V Bms
{Land R)
Frequentie range © 20 Hz - 20 kHz
MICROPHONE
Microphone
impedance range —. 200 - 2000 Ohm
MISCELLANEOUS
Remate Control 20 key RC-5 infrared
RC socket - ESI bus, 2x cinch
Mechanism : 2 motor metal deck
Tape-speed : 4,76 cm/sec
Display : 14 characters FTD
CABINET GENERAL
Material/Finish : Metal and polystyrene
Dimensions + 435 x 90 x 300 mm {w x hx d)
Accesories : Remote control, cinch cables
(2x), digital connection cable
Subject to modification without notice _
3122 321 52492
_— eee
PCS 83 508
PHILIPS SOUND & VISION, BG AUDIO - Service Training
1 GENERAL
1.1 DCC recorders third generation.
In reference set DCC951 the third generation of
DCC technology has been applied. This set can
be split up in the electrical interface part and the
tape drive part.
In the interface part the front contro! module and
the power supply unit with in- and output modules
are located.
The front contro! module concentrates on the
tasks towards the user of the DCC-set, such as
keyboard and remote control.
The tape drive part is a stand-alone DCC Module,
which controls the DCC mechanism and the DCC
ICs. It implements the DCC standard in such a
way that the interactions of DCC and mechanical
contro! are hidden for the front control module.
This DCC module is called "DDU" (Dec Digital
Unit).
The OCC Digital Unit (DDU-2113) consists of
* Motorized landscape tray-loader
* DCC high speed mechanism (CMRD tape
deck).
* DCC electronics
* Standardized I/O's
DDU-2113 CONCEPT
CASSETTE
DDU-2113 §
DECKA.OADER
CONTROLLER
TAPE DRIVE
UNIT
* DECK COMMANDS
DATA REQUESTS
* STATUS
= CASSETTE INFt
“TINE INFO
OCC DIGITAL
UNIT
FRONT
USER
Fig. 1. Typical 3 part architecture of a DCC recorder
PHILIPS SOUND & VISION, BG AUDIO - Service Training
CIRCUIT DESCRIPTION
Because it is expected that this DU module
and/or derived versions of it, will be applied in
many different audio sets the various functions of
the tape drive part (= DDU module) will be
explained in detail in this publication.
The complete DCC set can be seen as existing
out of three main parts, shown on figure 1:
«The Front Module
* The DCC Digital Unit
* The Tape Drive Unit
The tasks of the Front Module are
* the dialogue with the user via keyboard or
remote control,
* the dialogue with other audio components,
* controlling the DCC Digital Unit,
+ — showing the status of the system on a display
and
+ the set specific procedures such as sequence
programming.
The Front Module communicates with the DCC
Digital Unit by means of an easy and well defined
interface. The Front Module controls the
communication to the DCC Digital Unit.
The DCC Digital Unit provides allt audio inputs
and outputs, it starts the PASC and Drive
processing and it controls the Tape Drive Unit
mechanics. It accepts its commands from a front
controller via an interface. This module acts as
the master for the Tape Drive Unit. The
microprocessor of the DCC Digital Unit takes care
of realization of the DCC system standard
regarding auxiliary and system information
generation (sub-code) and handling and control of
the IEC958 interface standard.
The Tape Drive Unit handles all aspects around
the cassette, deck and loader. It provides means
for recording of DCC cassettes and playback of
DCC and compact cassettes in such a way that
specific hardware and timing aspects of the
mechanics are hidden for the DCC Digital Unit,
which controls it.
The electrical and control interface of the Tape
Drive Unit gives the possibility to communicate
with the controlling DCC Digital Unit and passes
information on the loaded cassette to it.
The DCC Digital Unit remains the master of the
Tape Drive Unit interface.
PCS 83 509