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14 | Section 2
if they could, the profanity delay would be a problem, since the talent needs to hear the callers
pre-delay.
All perceptual codecs (such as the Telos Zephyr) have too much delay for talent at remote
locations to hear themselves via a round-trip loop. erefore, another mix-minus is required to
feed a codec.
e talent hears callers via the codec return path. As before, you feed this return with mix-
minus: a mix of everything on the program bus minus the remote audio.
As for the second half of the equation, the callers hear the talent because the remote feed is
added to the telephone mix-minus bus. is is no problem if you have a set-up that permits
selective assignment to the hybrid mix-minus.
A problem could result from a hybrid with too much leakage and the codec delay. If the hybrid
isn’t doing a good job of preventing the send audio from leaking to its output, the remote mix-
minus is corrupted. Remember, if any of the announcer audio from the remote site is returned, it
will be delayed by the digital link, causing an echo effect in the announcer’s headphones.
e Telos Nx12 really shows its stuff in this situation. Because it has such good trans-hybrid
loss, leakage is not at all likely to be a problem. And should there ever be a problem, you can
solve it increasing the amount of ducking. See Sections 5.4 and 5.11.
Input (To Caller )
e Nx12’s can be ordered with either analog or AES3 audio connections. A label near the XLR
connectors will tell you with which your unit is equipped. In the case of analog there are two
inputs. In the AES case there are two physical inputs, corresponding to four signal inputs.
Analog Inputs
e analog inputs have the following characteristics:
Active balanced
♦
Line level: -10dBv to +8dBu nominal level ♦
Maximum input level (clip point): +24dBu ♦