The Telos 100 Delta is our premiere POTS telephone interface, designed for mission-critical applications where quality audio and 24-hour reliability are paramount. Using advanced digital signal processing techniques, the 100 Delta produces the most natural sounding, two-way conversation even on the most difficult telephone lines. (See the "Q&A - Analog Systems" discussion in our Tech Talk section for more about this.)

Consistent output level, improved tonal quality and superior trans-hybrid loss for full-duplex audio are hallmarks of the Telos 100 Delta. Smart digital gain control and Digital Dynamic Equalization (DDEQ ) offer the highest level of caller intelligibility. In addition, callers can be monitored through open speakers without feedback.

In short: the 100 Delta, with its wide range of user-adjustable settings, allows you to tailor the sound of your calls and get better caller-to-caller audio than ever before—in situations where it counts the most. Check out these features:

• Advanced auto-nulling digital hybrid has excellent send audio rejection and produces very pure caller audio. Trans-hybrid loss typically exceeds 50dB. The Telos 100 Delta automatically adapts to each new call.

• DDEQ Digital Dynamic Equalization improves the tonal quality of caller audio by automatically correcting spectral degradation. This revolutionary technology, pioneered by Telos, results in more accurate and intelligible caller audio.

• Digital Logarithmic Automatic Gain Control (dB linear AGC) for consistent operation over a greater dynamic range. This is a significant improvement over linear gain control schemes, as call levels presented to the hybrid may vary as much as 30dB.

• Extremely smart and fast context-sensitive output AGC. Processing is only as dense as required for consistent caller levels. 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.

• Two duplex-depth settings can be established and remotely selected. Duplex-depth is adjustable on both controls from full-duplex (no ducking) to half-duplex (switching). This allows remote switching from a "live" setup to one where calls will be recorded prior to airing.

• Digital Echo Elimination, Telos' proprietary two-stage feedback suppression system. The 100 Delta allows significant gain-before-feedback when monitoring callers through open monitor speakers.

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

Premiere Radio Networks relies on Telos 1A2 and 100 Delta to produce their nationally syndicated talk shows. Click here to read more.