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• The signal format of the digital input/output terminals

of this unit is as shown in the following table.

• The COAXIAL input terminal conforms to the digital

audio interface international standards IEC-958
consumer use format and the IEC-958 commercial use
format adopted by the PCM-2300, PCM-2700, and
PCM-2700A.

AES/EBU format

AES/EBU

AES/EBU format

COAXIAL

IEC-958
consumer use format

IEC-958
commercial use format

IEC-958
consumer use format

• The copy information recorded on tape during

recording differs according to the input terminal and
signal format used. Details are provided in the
following table.

• The AES/EBU and IEC-958 commercial use format

does not use copy information with digital signals.
The IEC-958 consumer use format uses three types of
copy information-“permitted”, “permitted only for one
generation”, and “prohibited” (serial copy management
system).

AES
EBU

AES/EBU

None

Possible

Permitted
(ID6 : 00)

None

Possible

Permitted
(ID6 : 00)

Permitted

Possible

Permitted
(ID6 : 00)

Permitted for
o n e   g e n e r a -
tion only

Prohibited
(ID6 : 10)

Possible

Prohibited

Possible

Prohibited
(ID6 : 10)

IEC-958
Consumer
use

COAXIAL

ANALOG
(LINE)

—

—

Possible

Permitted
(ID6 : 00)

• When “AUTO” is displayed during recording, the

recording position is automatically identified from the
input signal, and the start ID is recorded. The following
table shows the input terminal used and the
automatically recordable signal format.

• With the ICE-958 consumer use format, the method of

identifying the start ID recording position differs
according to the category code on the digital signal.

g : Automatically recordable
G : Automatically unrecordable

AES/
EBU

AES/EBU

G

G

g

c)

g

d)

g

g

IEC-958
commercial use

IEC-958
consumer
use

(DAT)

(CD)

(Others)

G

G

g

g

G

G

G

g

e)

G

COAXIAL

ANALOG
(LINE)

—

g

G

G

a) After an input level below approx. –50 dB (–45 dB for

ANALOG (LINE)) is continued for more than about 3
seconds on the meter, recording starts when an input above
this level is input.

b) Signals are automatically recorded in the same way for the

DAT skip ID.

c) L i m i t e d   o n l y   t o   w h e n   P C M - 2 6 0 0   a n d   P C M - 2 8 0 0   a r e

connected.

d) Limited only to when PCM-2300 and PCM-2700, PCM-

2700A are connected.

e) For some CD players, the music information is not output to

the digital signal.

• The lock range of the digital signal (receivable range)

is about ±0.1 % of the sampling frequencies 48 kHz,
44.1 kHz, and 32 kHz.Variably played back (variable
pitch) signals cannot be received.

• When digital signals in which the sampling frequency

information and actual sampling frequency do not
match on the digital signal, these can be recorded by
matching the REC MODE switch on the front of the
unit to the actual sampling frequency.

IEC-958
Commercial
use

— 26 —

 shows the general structure of the system. The system, as shown in the figure, is composed mainly of the 3rd

generation LSI CXD2605Q for its digital audio signal processing system and three microprocessors for controlling the
whole system. The microprocessors are equipped with the functions shown in 

 and control the respective

parts.

Main Microprocessor

IC501

IC502

IC701

Mechanism Microprocessor

(Servo Process)

Display Microprocessor

The 3rd generation digital signal processing LSI (CXD2605Q) is composed of most of the digital signal processing
circuits required for recording and playback, digital I/O signal processing circuit, semi-nontracking (semi NT)
demodulation processing circuit used for LP mode playback, etc.
A 1-bit 

G 64 oversampling A/D converter and SBM (super bit mapping) digital filter in the next level operate during

analog recording to carry out SBM processing of 24-bit quantized digital data to convert it to 16 bits for improved sound
quality. (The SBM function can be turned ON and OFF.) The main microprocessor (IC501) controls the whole system
and signal processing, and the mechanical microprocessor (IC502) controls the mechanism section. It is composed of
servo circuits controlling the drum, capstan, reel servo, etc. using software.
The display microprocessor (IC701) incorporated with a fluorescent display tube controller and driver circuit carries out
detection of key inputs and remote control signals. A 1-chip sensor amplifier (IC3) is used to perform wave-rectification
of the capstan FG and drum FG/PG.
The EEPROM (IC517) connected to the mechanical microprocessor stores data on the drum operation time and number
of cassette compartment operations. It also stores the adjustment data for DPG and FWD torque, FWD back tension, etc.
required during electrical adjustments. Each time the power is turned ON, the data is transmitted to the mechanical
microprocessor and adjustments are carried out by the servo circuits.

•

Control of the whole system

•

Control of the Fs system clock

•

Control of signal circuits such as DAT DSP (CXD2605Q)

•

Control of the mechanism section

•

Drum, capstan, reel servo control (Software servo)

•

Control of the display section

•

Display driver circuit

•

Key input, input control of the remote control signal

— 27 —

DAT DSP

CXD2605Q

IC503

SBM DIGITAL FILTER

IC308

A/D CONVERTER

IC307

DIGITAL FILTER

D/A CONVERTER

IC314

PEAK LEVEL

DETECTOR

IC702

DISPLAY

MICON

IC701

KEY

MAIN MICON

IC501

MECHA MICON

(SERVO PROCESS)

IC502

SI

SO

CK

S-RAM

IC504

D0 - D7

RX

ADDT

DADT

REAL TIME

CLOCK

IC518

DI

DO

CK

REQ

ACK

RF AMP

IC1

RFDT(PB)

REDT(REC)

RF SIGNAL

REC DATA

A

B

DRUM

MOTOR

M904

SWP

ATF AGC

M

SENSOR

AMP

IC3

DRUM/CAPSTAN

MOTOR

DRIVE

IC1

M

REEL

MOTOR

DRIVE

M

REEL

MOTOR

M903

CAPSTAN

MOTOR

M902

ATF PILOT/PBDT

DPWM/CPWM

DPG/DFG/CFG

TPWM/SPWM

TFG/SFG

FLUORESCENT

DISPLAY

FL701

T0 - T12

S0 - S23

REMOTE

CONTROL

RECEIVER

IC703

M

FWD/BRAKE  PM901

PLUNGER  PM902

LOADING MOTOR M901

CASSECON MOTOR M1

END

SENSOR

DETECT

SWITCH

PM KICK/ON

LM EJEFT/LOAD

CAS M OUT/IN

DIGITAL IN/OUT

IN

OUT

TX

ANALOG

EEP ROM

IC517

A0,A1

D0 - D3

A0 - A14