Specifications

Recording
To record a true 20 bit signal onto an ADAT recorder (which is a 16-bit recorder) the following steps must be
taken:
1. Connect optical cable from AD-1000 optical output to the optical input of the destination ADAT. Set ADAT
to “digital input.” Note: the optical cables cannot be “looped thru” ie, multiple input to output connections
made as in “digital track- bouncing” mode. Only connect between AD-1000 and the machine to be recorded
on to.
2. Select any analog input (+4, –10 or mic pre) or the oscillator.
3. Select the appropriate sync source (crystal, WC, video, etc.).
4. The 16 / UV16 / 20 switch should be set to 20 (20-bit output).
5. Select the sample rate of choice. Please note that ADAT will only accept either 44.1 kHz or 48 kHz, so if you
select any variation of 44.1 kHz (44.056 or 44.144) you will still only get 44.1. Likewise with 48 kHz – selecting
any of 47.952, 48, or 48.048 will get you only 48 kHz! Also note that when using an external sync source (WC,
video, AES, etc.) the gear box function (x1.001 or ÷1.001) does not operate. Further note that when referenced
to NTSC video, both sample rates will be pulled down to either 44.056kHz or 47.952kHz.
6. Lastly, the power switch must be switched to the ADAT position – to the right, opposite of NORM.
7. Eight channels of information will be transmitted (two stereo pairs): you will need to select four adjacent
tracks, either 1 thru 4 or 5 thru 8, to be able to properly decode this information for playback.
Playback
To play back this special signal format, it must first be recombined into a “normal” 20-bit signal (AES or S/PDIF).
It can then be UV22’d to a CD recorder or converted to analog by one of our DA-1000E-20 digital to analog
converters.
1. Connect an optical cable from the ADAT output to the AD-1000 optical input. Please see above note about
“looping.”
2. Select “DIG” (digital input) on the Input Selector Switch.
3. Select “OPT” (optical) on the Sync Source Switch.
4. The 16 / UV16 / 20 switch will select the level of resolution at either the AES or S/PDIF (optical) outputs. Note
that in this mode the optical output is in the S/PDIF format, not ADAT.
5. The power switch should be selected to ADAT.
6. The Sample Rate switch now determines which of the eight tracks are received and in what form. The fol-
lowing chart shows the various possible combinations.
Sample Rate Switch Position Track Format Channel
1 o’clock (47.952) 1 16 bit A
2 4 bit B
2 o’clock (48) 3 16 bit A
4 4 bit B
3 o’clock (48.048) 5 16 bit A
6 4 bit B
4 o’clock (x1.001) 7 16 bit A
8 4 bit B
5 o’clock (unmarked) 1&2 20 bit A
3&4 20 bit B
6 o’clock (unmarked) 5&6 20 bit A
7&8 20 bit B
In positions 1 o’clock to 4 o’clock, the output of the AD-1000 (AES or S/PDIF) will be a 16-bit signal on channel
A (left) and the 4-bit plus tone signal on channel B (right) from each of the selected track pairs. In positions 5
and six o’clock, the output (AES or S/PDIF) will be a “normal” (recombined) 20-bit two-channel signal from the
selected group of four tracks.
AD-1000 Operating Manual
Page 40