User Manual

44
capacitance 75Ω 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, INTERFACE MISMATCH, appears in the display. Possible
mismatches can include professional/consumer data 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 48K
Linear format requires 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 correctly output audio data or flags. Also, the data might be
flagged 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. Use the Playback Sample Rate Converter (
Page 21 ) to make all of your cuts conform to a single sample rate at the output. 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.