Data receiver including means for forming line samples and method of operating such a data receiver.

摘要

In a multipoint data communication system a master modem and a plurality of tributary modems are interconnected via respective transmission channels. Adaptive equalizer circuitry (55,56) in the master modem equalizes the channel from a particular tributary by multiplying samples of signals received from the tributary by an appropriate ensemble of tap coefficients stored in a memory (91). Timing-acquisition circuitry (29) adjusts the phase of the master's sampling circuitry (23, 27) at the start of transmission from a given tributary so that the received signals are sampled at the correct time points. In order to do this, a timing acquisition signal having spectral components only within the non-rolloff region of the equalized baseband-equivalent transfer function is transmitted by the tributary. The master samples and equalizes the received timing acquisition signal to form a succession of timing acquisition equalizer outputs.