Bit Recording Option - Apogee AD-1000 Operating Manual

Recording with the BRC as the master (AD-1000 as the slave)
Terminate w/75
ADAT
"Digital In"
ADAT w/BRC – BRC as Master
1. Connect the output from your console or microphone to the AD-1000 XLR input connectors. (When viewing
the AD-1000 from the rear, the Left XLR is on the left side)
2. Select any analog input (+4, –10 or MIC) on input select switch.
3. Set the front power switch of the AD-1000 to the ADAT postition.
4. Set the SYNC SOURCE to WC.
5. Set the SAMPLE RATE selector to the unmarked position (6 o'clock - straight down).
6. Connect the word clock cable (75
nector. Terminate the unused BNC with a 75
7. Set the BRC to internal sync.
8. Connect the optical cable from your AD-1000 optical output to the optical ADAT input of the destination
ADAT . (When viewing the AD-1000 from the rear, the optical output is on is on the right side).
9. Set the ADAT unit to DIGITAL IN.
10. Arm the desired tracks of the ADAT (left channels are odd numbers and right channels are even numbers ).
Resolving ADAT to Video with the AD-1000
Using good quality (Apogee) 75 cable, connect a good quality video sync (blackburst) generator to one of the
sync inputs (BNC connectors on the rear panel) of the AD-1000. Using the other BNC on the AD-1000, which is
connected as a loop through, connect a cable to the VIDEO IN connector (BNC) on the BRC. The BRC is nec-
essary to reference the ADAT to video sync.
Set the BRC to EXTERNAL VIDEO (EDIT, EXT SYNC, VIDEO).
On the AD-1000, select NTSC SYNC on the SYNC SOURCE switch.
The power switch should be set to ADAT.
Set the SAMPLE RATE switch to either 44.1kHz or 48kHz.
The ADAT should be set to DIGITAL IN.
20-bit Recording Using the ADAT
With the addition of the 20-bit bit-splitting option (AD1K-PRT), the Apogee AD-1000 has the ability to record a
true 20-bit signal on to tape. Since current modular digital multitracks (MDMs) can record a maximum of 16-bits
per track, the 20-bit signal is split onto two tracks, with the 16 MSBs (most significant bits) being recorded onto
track one and the 4 remaining LSBs (least significant bits), plus a low level 1 kHz square wave, being recorded
on to track two – the tone indicating that the signal on this track is not designed to be used alone.This infor-
mation makes up the 20-bit signal of the "A" channel (left). The process is repeated for the "B" channel (right)
information, with the MSBs recorded onto track three and the LSBs (and low level 1 kHz tone) recorded onto
track four. Alternately (or additionally) this can be done on tracks five through eight. Thus we have a two chan-
nel 20-bit recording on four tracks. The information given here applies to ADAT format recorders: DA-88-com-
patible machines can be used with the addition of the Apogee FC-8 Format Converter.
AD-1000 Operating Manual
75 Coax
Optical
Out
Fiber-Optic
Cable
Digital In
Sync 9-pin D
coax) from the 48 kHz output of the BRC to the AD-1000 top BNC con-
terminator (supplied in the ship kit).
48 kHz Out
BRC
Sync 9-pin D
Page 38
AD-1000
Sync Source:
WC
Sample rate:
6 o'clock
BRC:
Internal Sync