| 摘要 |
An analog front end for communicating discrete multitone modulated signals on a subscriber line includes a hybrid network (620) for eliminating near-end echos. The hybrid network includes a hybrid input, a receive input, and a hybrid output. The receive input is capacitively coupled to a subscriber line (290) carrying upstream and downstream data signals. The hybrid input is capacitively coupled to receive the upstream data signal from a driver (610) that also provides the upstream data signal to the subscriber line. The hybrid output provides the extracted downstream data signal from the subscriber line. The analog front end includes a power spectral density filter (340) and a high pass filter (320) that enable the use of a first order hybrid network for extracting the downstream data. The analog front end may include an additional analog channel to enable voiceband (e.g., v.90) communication concurrent with non-voiceband (e.g., xDSL) operation.
|
