Emphasis Identification Bits - Sony PCM-1630 Operation And Maintenance Manual

A0-23 board
@mil: EMP (emphasis) switch
This switch activates (ON) or deactivates
(OFF) the emphasis circuitry during
recording.
When this switch is set to ON, the
high-frequency response is boosted
automatically during recording
(pre-emphasis, with a time constant of 50
psec./15 psec.) to reduce the amount of
noise and improve the signal-to-noise ratio
(the boosted amount is detected and the
response is lowered during playback).
When this switch is set to OFF, a recording
is made with the flat frequency response.
The EMP switch is factory preset to OFF.
(] &W2: Dither switch
This switch activates (ON) or deactivates
(OFF) the dither generator circuit.
When this switch is set to ON, the dither
is mixed with a low level input signal in
order to suppress audible noise. Although
the dither level is set at less than 1 LSB
the noise level will be raised somewhat
when the switch is set to ON.
This switch is factory preset to OFF.
Emphasis identification bits
The setting of the EMP switch does not
affect the emphasis identification bits in
the output signal data when the ENC IN
selector on the front panel is set to a
particular position, as shown in the
following table. The relationships between
the setting of the ENC IN selector and the
emphasis identification bits are as
follows.
~Output
I\
signal
ENC IN\
sel ec-
tor
ANALOG
DIGIT-
AL
DUB-
BING
AD OUT
connec-
tor
ON/OFF
of the
EMP
switch
on the
AD board
ON/OFF
of the
EMP
SWitch
on the
AD board
ON/OFF
of the
EMP
switch
on the
AD board
COMPOS-
ITE DIG-
ITAL
OUTPUT
connec-
tor
ON/OFF
of the
EMP
switch
on the
AD board
ON/OFF
of the
emphasis
bits in
the dig-
ital
signal
data
input to
the ENC
IN con-
nector
ON/OFF
of the
emphasis
bits in
the sig-
na-l data
input to
the COM-
POSITE
DIGITAL
INPUT
connec-
tor
DEC OUT
connec-
tor
Ir rele-
vant*
I r rele-
vant*
ON/OFF
of the
emphasis
bits in
the sig-
nal data
input to
the COM-
POSITE
DIGITAL
INPUT
connec-
tor
* In the E-to-E or playback mode, the
emphasis depends upon the ON/OFF status
of the emphasis identification bits in
the signal data input to the COMPOSITE
DIGITAL INPUT connector(s).
1-13 (E)