| 摘要 |
<p>The audio signal transmission system is used in a radio studio where audio signals are fed to and from a telecommunications line via a conventional 'fork' circuit (3). The microphone (8) in the studio and a loudspeaker (7) are connected (4, 5) to the fork circuit (3) via circuits (A,B) which suppress parts of the signals which are due to sonic feedback between the speaker (7) and the microphone (8).$ The circuits (A, B), which are identical, consist of a digital signal processor (15) which controls the characteristics of a filter (16) between one line and a subtraction circuit (17, 12) in the other line. @(12pp Dwg.No.3/3)@.</p> |
