360 Systems Instant Replay DR-552 - Manual (Page 22)

Instant Replay Owner’s Manual page 17
DIGITAL AUDIO CONNECTIONS
AES/EBU Input
An XLR-3 female connector is provided for digital input in the AES/EBU format. There is a
selectable Sample Rate Converter built in to Instant Replay. When SAMPLE RATE
CONVERTER is ENABLED, the input will accept any sample rate from 24k samples/second to
50k samples/second. Use only special AES cable having an impedance of 110 ohms. Limit the
cable run to 100 feet. Do not use microphone cables for runs of over 6 feet.
IEC 958 Type II Input
An RCA "phono" connector provides a digital input from consumer or semi-pro equipment. Most
equipment with connectors marked "S/P DIF" can be connected to this input.
As described in the previous section, when SAMPLE RATE CONVERTER is ENABLED the
input will accept any sample rate from 24k samples/second to 50k samples/second. Use only low-
capacitance 75
Ω
coaxial cable, such as those made for video connection between VCRs and
television video inputs. Do not use audio cables with RCA connectors.
Digital Audio Interfacing
Should Instant Replay detect a mismatch at its digital audio ports when preparing to record, the
P
LAY button is disabled and an error message appears in the display. Possible mismatches can
include format conflicts, non-audio data and data flagged as invalid. Copyright Protected data
(“SCMS”) will cause a similar error message. Correct the mismatch as necessary.
If the SAMPLE RATE CONVERTER is DISABLED, another mismatch condition can arise
between the selected RECORDING FORMAT and the sample rate of the incoming digital audio.
The AC-2 and 48K Linear formats require the digital audio to be input from a 48K source. The
44.1K Linear format requires digital audio to be input from a 44.1K source.
Some digital audio equipment does not output audio data or flags the data as invalid when not in
play mode. This is most common in consumer CD players with digital outputs. The following
techniques may help:
1. Put the device in Play and Pause before pressing Play on Instant Replay to start recording.
2. Put the device in play and “cue” or “scan” backwards until the previous audio selection is
heard, or in the case of CDs the “preroll” seconds are displayed (usually shown as P :02 or
-:02). Let go of the button on the device and press Play on Instant Replay either immediately,
or as soon as the previous selection ends.
3. Start Instant Replay recording on the fly between two selections. This can be useful with
DAT machines that are unstable until they have played for a few seconds.
In cases where Instant Replay records for only a few milliseconds or seconds and then stops,
check for proper connections and cabling. Try another cable, or different device equipped with a
digital output.
If all else fails, use the analog inputs. The conversion to digital is of high quality and will result
in minimal loss of fidelity.
Digital Audio Output