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  • All processing is performed completely in the digital domain.

  • An advanced digital auto-nulling hybrid with excellent send audio rejection. Trans-hybrid loss is typically greater than 40dB, so very pure caller audio appears at the output. The Telos ONE automatically adapts to each new call.

  • An input gain processor with a smart, floating freeze-gain gate.

  • A sophisticated output gain processor that provides level control and smart downward expansion. This section is cross-coupled to the input section so that telephone line noise and residual hybrid leakage are carefully and cleanly attenuated without low-level callers being gated off.

  • A selectable override function to reduce the caller level about 8dB when input audio is present. This allows the talent's voice to have more presence when speaking at the same time as the caller.

  • Digital Echo Elimination to allow significant gain-before-feedback when used with open monitor speakers.

  • High- and low-pass filtering to clean up phone line noise and hum.

System True digital. Second generation Texas Instruments. TMS320C25 processor. 8kHz sampling rate. Internal digital input and output gain processing, filtering.

Trans-hybrid Loss >40dB with pink noise or voice as test input. Test set-up as specified in our Telephone Q &A. All dynamic enhancement processing is switched off. With the override and output expander functions switched in, trans-hybrid loss is enhanced to >50dB.

Send Level to Phone Line -lOdBm average level. Maintained by internal digital AGC.

Frequency Response (caller to output) 200— 3400Hz, ±1dB.

Noise and Distortion (caller to output) Distortion: Typical 0.4% THD+N, measured ~ 1kHz at any level from -48dBni to -8dBm. Signal-to-Noise: >72dB referenced to OdBm phone level.

Send Audio Input XLR female connector. Active balanced. Accommodates -24dBm to + l2dBm levels in LINE mode; -68dBm to -35dBm in MIC mode. Front panel screwdriver level adjustment.

Caller Audio Output XLR male connector. Active differential. Output levels to +l4dBm depending upon caller telephone line level and adjustment of front panel level adjust. Drives 600 ohms.

Aux/Mix Output XLR male connector. Active differential. In AUX mode, this output is an isolated second output. In MIX mode, this is a combined send and caller output. Input to Mix output: Unity gain. <0.04 % THD; + l2dBm clip point.