D19M C4Ad Ns/24 - Quad 24 Bit A/D With Noise Shaping - Studer D19m Service Instructions Manual

2.1.2 D19m C4AD NS/24 – Quad 24 bit A/D with Noise Shaping
Dithering and
Noise Shaping:
CH 4
OVERL.
EXT. INT.
CH 3
CONTROL
EXT
16NS+D
CH 2
SYNC
CH 1
SUPPLY
Date printed: 30.06.20
The A/D card uses high-end 24 bit Delta-Sigma converters and can be used
for standalone applications as well as for the D19m rack. On one card, four
analog inputs (mono) are converted to two AES/EBU outputs; if a MADO
card is used in the system, these signals can be converted to a MADI link.
The converted signal is also available as 16 bit word by using dithering or
dithering and noise shaping algorithms.
If the external sync signal fails or if used in standalone applications, the
sampling frequency will be generated on-board. For such cases the sampling
frequency can be selected at the front panel (44.1 or 48 kHz).
The channel status information contains the sampling frequency as well as
source channel information depending on the card address.
The card is equipped with 24-bit converters. If there is a need for 16 bit
resolution, dithering and noise shaping or dithering only can be activated.
Dithering helps to improve the low level signals whereas noise shaping al-
lows to have almost the dynamic range of a 24 bit converter in the mid fre-
quency range.
Jumper diagram of the earlier version 1.940.561 at the end of this chapter.
LINE IN 1
LINE IN 2
LINE IN 3
LINE IN 4
TRANSF. BALANCED
SYNC IN
AES DARS
CH 4
MASTER
CH 3
CH 2
CH 1
fine adj. 0...26 dBu
15 dBu
21 dBu
variable
D19m Technical Description
DSP
REC
AES
Sync
TTL
1.940.563
C-BYTE
OVER IND
TABLE
SHIFT
REG
CONTROLLER
INT REF
CH 1/2
CH 3/4
D19m E19
TDM BUS
CLOCKS
AES OUT 1
AES OUT 2