| 摘要 |
<p>A method of improving the audibility of sound from a loudspeaker (1) located close to an ear (2) comprises detecting ambient sounds arriving from other sound sources using a transducer (3) which provides corresponding ambient sound signals, inverting the polarity of said signals, and passing the said ambient sound signals through a filter (4) having a transfer function which compensates for the spectral acoustic modification of sounds travelling from the loudspeaker to the ear caused by the proximity of the ear to the loudspeaker, and/or the proximity of the transducer to the head, and combining the filtered ambient sound signals with the signals being fed to the loudspeaker to reduce the audibility of said ambient sounds.</p> |
