| 摘要 |
<p>A personal listening device includes an amplifier with an automatic gain control circuit for automatically limiting at the amplified output the amplitude of electrical signals supplied to the signal input. A directional microphone is connected to the signal input of the amplifier, the directional microphone produces electrical signals representative of sounds prevalent at a position at which the microphone is directed. The amplifier and directional microphone are mounted in an ergonomically designed housing for easy direction of the microphone. Earphones or a hearing aid are connected to receive the amplified electrical signals from the amplifier and convert the electrical signals to sound.</p> |
