360 Systems Instant Replay DR-554 - Manual (Page 29)

Instant Replay Owner's Manual Page 29
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:
§ Put the device in Play and Pause before pressing Play on Instant Replay to start recording.
§ 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 to begin recording
immediately.
§ Start Instant Replay recording on the fly between two selections and use Head Trim to remove
any unwanted audio from the start of the recording. 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
When using Instant Replay as a digital audio source, RECEIVER ECHO should be DISABLED in
the FILE TRANSFER MENU. Also, it is not a good idea to use cuts with different sample rates
on the same project, as this may cause equipment connected to the digital outputs to click, pop, mute
or stop recording when the sample rate changes. The analog outputs are not affected by sample rate
changes.
AES/EBU Output
An XLR-3 male connector provides a digital audio output in the AES/EBU format. Use only special
AES cable having an impedance of 110 ohms. Limit the cable run to 100 feet. Do not use microphone
cable for runs over 6 feet.
Always set the DIGITAL AUDIO OUTPUT parameter in the CONFIGURATION Menu to
PROFESSIONAL when using the AES/EBU output. Although the output is still active with the
CONSUMER output formats selected, the signal is not AES/EBU compliant.
IEC 958 Type II Output
An RCA "phono" connector provides a digital audio output to consumer or semi-pro equipment. Most
equipment with input connectors marked "S/P DIF" can also be connected to this output.
Always set the DIGITAL AUDIO OUTPUT parameter in the CONFIGURATION Menu to
CONSUMER or COPY PROT. CONS. when using the IEC 958 Type II output with IEC 958 or S/P
DIF equipment. Recordings made from Instant Replay in COPY PROT. CONS. mode can not be
copied by other digital audio input devices equipped with the Serial Copy Management System
(SCMS).
When DIGITAL AUDIO OUTPUT is set to PROFESSIONAL, this output produces a signal that is
compatible with the AES/SMPTE digital audio standard. This signal is normally supplied on a BNC
connector. It is designed to allow digital audio to be routed and cabled using the same methods as
75
Ω
video signals.