Aes/Ebu - Telos Zephyr User Manual

path and phones taken at the studio. Note that this is the same as
required for satellite links.
Another issue worth considering is the round trip delay. The apparent on- air response
time of the talent to callers' comments will be the sum of studio- to- remote delay +
remote- to- studio delay + talent's thinking time. For this reason the studio- to- remote
path will generally use the G.722 mode which sacrifices fidelity for delay (after all, the
callers need not be in high fidelity). This round trip delay issue will also effect your
choice of remote- to- studio coding. If the show will be 90% talk with just a small
amount of music then 200 msec of delay can be saved by using L3 DUAL Xmt/ L3
MONO Rcv for this path rather than using the slower L3 STEREO mode. Another trick is
to use a POTS call (either by Zephyr or using a phone coupler) for the studio- to- remote
link which will make the delay in that direction very small. Other intermediate tradeoffs
are possible and will be dependent on your format. Talent's thinking time can be
significantly reduced by drinking a strong cup of coffee!
For information on the tradeoff between audio quality and delay refer to manual
section 7 (Audio Coding Principles).

AES/EBU

This is offered as an option, so it may not be present in your unit. The Zephyr's
AES/EBU capability was designed for flexibility. Sample rate conversion is possible on
both input and output. An input is provided for an external sync signal.
Two LCD menu items are used to specify operational modes.
The choices for input mode are:
Output mode options are:
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Section 4
NO (ANALOG)
Use analog input.
S/R CONVERT
Use AES/EBU input and sample rate convert to selected sampling rate (32 or
48kHz, 16 kHz in case of G.722).
SYNC TO NET
Use AES/EBU input but do not sample rate convert. Input signal must be
synchronous to the clock on the AES/EBU- OUT ( which is locked to the ISDN
network clock).
NO CONVERT
Do not sample rate convert. Uses sampling rate of received signal.
32 kHz/44.1 kHz/48 kHz
Sample rate convert to the specified frequency.
EXTERNAL
INSTALLATION & BASIC OPERATION