| 摘要 |
<p>The invention provides an interface device for automatically interfacing a natural telephone input device to a telephone host system having an at least 4 wire input/output configured for a specific type of telephone input device comprising an input/output for connection to the telephone host system (14), an input/output for connection to the telephone input device (12), diagnostic circuitry (15) for interrogating the telephone host system (12) to indentify the specific type of telephone input device including testing for DC voltage and detecting current and signal shaping circuitry (b, c and d), responsive to the diagnostic circuitry (15), for shaping the output of the microphone of the actual device so that it appears as if it is a microphone of the specific type.</p> |
