| 摘要 |
<p>The invention relates to an acoustic pulse response system for determining the shape of the nasopharyngeal cavity in a subject by introducing an acoustic impulse from an acoustic wave source transducer (20) through a wave tube (22) into the respective nasal cavities of the subject. Microphone (24) detects the propagation of both the original acoustic waves and reflections thereof in tube (22). For processing, the apparatus includes electronic amplifier (26) for amplifying the electrical signals and low pass filter (28) for filtering the electrical signals. Computer (30) processes the electrical signals and computes the length of the nasal septum.</p> |
