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AES
AES/EBU
GAIN
SAMPLE
BLOCK
RATE
CONVERTER
INPUTS
ANALOG
EQ
BLOCK
ANALOG TO
DIGITAL
CONVERTER
AGC
AES/EBU
BLOCK
INPUT
SELECT
ANALOG
STUDIO IN
INPUT/
SEND
METER
SELECT
HYBRID SEND
Simplified Block diagram of the 2101 Studio Interface's integral Telos TWO dual hybrid. For
the sake of simplicity only one audio channel is shown.
The leftmost meter can display either the Studio Input levels (Send - to caller 1 & 2) from
your console or the Hybrid Send levels (Line 1 and Line 2) to the phone line. The Hybrid
Send levels are active even if a line is not connected. Pressing the small button on the meter
selects between Studio In and Hybrid Send. This level is controlled by the Input Gain and
Hybrid Send Level selections in the Audio menu. See section 2.4 for step-by-step instructions
and section 3.3.1 for more information on setting this level.
So what's the difference between Studio In level and Hybrid send level? Well, we're glad you
asked. The Studio In level represents the raw digital level after the analog to digital converter
(or the AES/EBU level after sample rate conversion) and gain adjust stage, while the Hybrid
Send level represents the signal after the AGC/Limiter and EQ stages. The Hybrid send meter
can be used to see how much limiting is occurring and fine tune your level. Once the Studio
In level is set using the Input Gain adjustment (from the Audio menu) you can then view the
Hybrid Send meter to see the levels after the AGC. This setting will allow you to see
remaining headroom when the system is in operation. See the diagram above for details.
The right meter displays either the Studio Out levels (Left and Right) from the Studio
Interface to your console or the Hybrid Receive levels (Line 1 and Line 2) from the telephone
network. Pressing the small button on the meter selects between Studio Out and Hybrid
Receive.
Once again, an explanation is in order. Hybrid Receive level represents the level of the caller
before any receive AGC action. The Studio Out levels show the caller audio signal which is
headed to your console, after the equalization, AGC, and gain adjustments have been made.
See diagram above for details.
THE STUDIO INTERFACE & ADDITIONAL HYBRIDS
SECTION 3 – STUDIO INTERFACE: DETAILED CONFIGURATION & REFERENCE
TELOS 2101 USER'S MANUAL
T-LINK
INTERFACE
BLOCK
DSP BLOCK
DUCKING
DECISION
BLOCK
HYBRID
BLOCK
OUPUT/
RECEIVE
STUDIO OUT
METER
SELECT
TELOS TWO - Signal Flow
PART IV
AES/EBU SYNC CLOCK
ISDN MASTER CLOCK
GAIN
BLOCK
DDEQ
BLOCK
AGC
BLOCK
HYBRID RECEIVE
AES
AES/EBU
SAMPLE
RATE
CONVERTER
OUTPUTS
DIGITAL
TO ANALOG
CONVERTER
ANALOG
ISDN AUDIO
CLOCK
CONTROL
AUDIO
IV-55
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