| 摘要 |
本发明揭露了一种数位用户回路之讯号收发电路，用来发送一输出讯号至一电信回路，或自该电信回路接收一输入讯号，包含：一变压器，耦接该电信回路；一讯号发送模组，耦接该变压器，用来产生该输出讯号；一讯号接收模组，耦接该变压器，用来处理该输入讯号；一回音消除电路，由被动元件所组成并具有两端点，一端耦接该讯号发送模组及该变压器，另一端耦接该讯号接收模组及该变压器；其中，该输出讯号透过该变压器之电磁耦合传送至该电信回路，以及该输入讯号透过该变压器之电磁耦合传送至该讯号接收模组。; a signal transmitting module, which is coupled to the transformer, for generating the output signal; a signal receiving module, which is coupled to the transformer, for processing the input signal; an echo cancelling circuit, comprising passive elements and having two ends, one of which is coupled to the signal transmitting module and the transformer, the other is coupled to the signal receiving module and the transformer. The output signal is transmitted to the telecommunication loop via the electromagnetic coupling of the transformer, and the input signal is received by the signal receiving module by the electromagnetic coupling of the transformer. |
