| 摘要 |
Headphones have a small cavity between the diaphragm and the ear canal with a microphone in the cavity closely adjacent to the diaphragm slightly off the axis of the ear canal and headphone diaphragm with the microphone membrane perpendicular to the headphone diaphragm. The microphone provides a feedback signal that is combined with the input electrical signal to be reproduced by the headphones to provide a combined signal that is power amplified for driving the diaphragm. The headphone transducer has a small 23 mm diameter diaphragm with a maximum excursion of 0.6 mm peak-to-peak and a low frequency resonance of 200 Hz. A disk of intracavity damping material inside the cavity isolates the microphone from the ear canal. |
