| 摘要 |
The telephone set includes, in addition to a handset 12, 14 connected to the terminals of the telephone line L1, L2 by a transmission path and a reception path, a circuit for amplified listening having a loudspeaker 32 connected to the terminals of the line by switchover means 48, 50 and amplifying means 20, 34, 39 provided with Larsen effect suppression means. The suppression means comprise a loop for progressive control of the gain Gr of at least one of the amplifying means as a decreasing function of the level applied to the loudspeaker 32 and of the level applied to the line by the transmission path. <IMAGE>
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