| 摘要 |
<p>SPEECH AID FOR LARYNGECTOMY PATIENTS A speech aid for laryngectomy patients is described and comprises an electromechanical transformer with a power output stage connected upstream, a pulse generator for the production of a basic frequency, manually operated switches and electrical filters designed to vary the pulse frequency as a function of time. The power output stage in this respect comprises an electronic switch which is controlled by the basic frequency and a controlling pulse generator which switches the electronic switch off at least with temporal priority over the basic frequency.</p> |
