| 摘要 |
A communication system 100 comprises a first set 204, 206 of transducers and a second set 210, 212 of transducers. The system further comprises a first signal processing device (106, fig 1) configured to produce a signal for transmission by at least some of the transducers in the first set to at least some of the transducers in the second set, and a second signal processing device (110, fig 1) configured to process signals received from at least some of the transducers in the second set in order to select a best said signal that is used for further processing. The first set of transducers comprises a first subset 204 comprising at least one said transducer, and a second subset 206 comprising at least one said transducer. Transducers in the first subset transmit on a first channel and transducers in the second subset transmit on a second channel having a different frequency. |
