| 摘要 |
<p>In order to improve the use of a telephone handset (1), there is provided a method of attenuating the noise generated in the environment by deriving an anti-noise signal (15) from a reference microphone (5) and combining this signal with instrument sidetone (35) for supply to the earpiece (37) of the handset (1). The anti-noise signal (15) may be mixed with the handset microphone signal or voice signal (7) before onward transmission of this signal to the telephone network. As a result the improvements in intelligibility are available not only to the handset user but also the receiving party.</p> |
