| 摘要 |
<p>The interface according to the invention comprises three main electronic switches (1, 2, 3) for connecting to the line terminals (5, 7) the main circuits of the telephone set (38-39) and a call-signal energy recovery converter (40). The first electronic switch (1) is connected at the output of a first rectifier bridge (30) itself connected between the line terminals (5, 7), in order to supply the circuits (38-39) during the off-hook phases. During these same phases, the second electronic switch (2) is closed. During the call phases, the electronic circuit (38-39) is supplied by the voltage (36) provided by the energy converter (40), itself supplied by a second rectifier bridge (31) itself connected to the line terminals (5, 7) by way of a capacitor (8). In this phase, the switch (3) is closed, and the switches (1) and (2) are open. The circuit makes it possible to replace the mechanical switching unit of telephone sets with integral bell. <IMAGE></p> |
