Studer D21m - Page 61

D21m System
D21m Modules 6-25Date printed: 25.09.07
6.3.7 Dolby
®
E/Digital Decoder Card ( and ) 1.949.443/.444
About Dolby
®
E Dolby
®
E allows encoding of up to 8 mono audio channels and some metadata
into a pair of two channels (e.g. AES/EBU) by using 20 audio bits thereof.
Both encoding and decoding processes create one video frame of delay.
Since the encoded data is packaged in sizes of one video frame it is possible
to “edit” the encoded stream, as long as the edits are synchronized with the
video frames and the stream is not modifi ed in any way (e.g. level changes
applied). For more details on Dolby
®
E please refer to www.dolby.com.
The Studer Decoder The D21m Dolby
®
E/Digital card hosts one (1.949.443) or two (1.949.444)
Dolby
®
E decoder modules. Each one is functionally very similar to one
Dolby
®
DP572 decoder. Both are operating independently, and the informa-
tion given below is valid independently for both decoders as well. The dual-
decoder card receives four AES/EBU pairs the front panel input, or eight
mono channels from the console-internal patch (showing up as patch desti-
nations). Each pair may contain a Dolby E or Dolby Digital encoded signal.
The card returns a total of max. 16 channels to the console patch (showing
up as patch sources).
The single-decoder card returns up to eight channels to the console patch
(eight sources) and shows eight inputs on the patch. Input channels 5...8 are
unused.
Notes: The single-decoder card only works correctly if the Dolby
®
E decoder module
is fi tted in position A1.
Both cards work at sampling frequencies of 44.1 or 48 kHz only.
Dolby
®
CAT552
Module
DB9 Port
256FS_SYS,
64FS_SYS,
FS_SYS
A_IN_0
1
0
Dolby
®
D/E
Detector
IN DET_OUT
STATUS[7:0]
1
2
3
0
Command
Field
Config Switches
SOURCE_SEL_MAN_nAUTO_0
SOURCE_SEL_00
PCM_LATENCY_MINIMAL_nONE_FRAME_0
PULLDOWN_MODE_0
DOWNLOAD_CONFIG_0
RESERVED_0
SOURCE_SEL_HW_nSW_0
ODD
96K/n48K
SOURCE_SEL_01
I8S to 4xI2S
Demux
ULOCK
Input Select
Logic
Audio Data
and Clk in
Audio Data
out
AES/EBU
Rx Master Mode
A out, Clk outIn
AES/EBU
Rx Master Mode
A out, Clk outIn
Main In 1
nLOCK
nLOCK
Dolby
®
D/E
Detector
IN DET_OUT
PCM Delay In 1
4xI2S to I8S
Mux
A_IN_4
Pinout and
selector
switches
RS422
Tx
RS232
Rx/Tx
RS422
Tx
RS232
Rx/Tx
Video
Sync
Separator
V in
METADATA OUT
Control Port
PCM Latency
Pulldown Mode
Download Config
SDO, SCLK,
nTXEN
Sync in
Dolby
®
CAT552
Module
A_IN_1
Dolby
®
D/E
Detector
IN DET_OUT
STATUS[7:0]
1
2
3
Config Switches
SOURCE_SEL_MAN_nAUTO_1
SOURCE_SEL_10
PCM_LATENCY_MINIMAL_nONE_FRAME_1
PULLDOWN_MODE_1
DOWNLOAD_CONFIG_1
RESERVED_1
SOURCE_SEL_HW_nSW_1
SOURCE_SEL_11
Input Select
Logic
Audio Data
and Clk in
Audio Data
out
AES/EBU
Rx Master Mode
A out, Clk outIn
AES/EBU
Rx Master Mode
A out, Clk outIn
Main In 2
nLOCK
nLOCK
Dolby
®
D/E
Detector
IN DET_OUT
PCM Delay In 2
4xI2S to I8S
Mux
A_IN_5
METADATA OUT
Control Port
PCM Latency
Pulldown Mode
Download Config
Sync in
A_OUT_0
A_OUT_4
n192K
Status
Field
SDI, SCLK,
nRXEN
Implemented in FPGA