| 摘要 |
<p>A universal receiver/sender is achieved by providing circuitry having parameters setable by binary data words from the data processing unit of a switching facility. A clock signal generator provides output signals corresponding to respective binary instruction words whereas the parameters of an analogue signals receiving circuit are controlled by binary control words. A plurality of commutating filter circuits receive pass band limited analogue signals from the receiving circuit and under control of signals from the clock generator provide binary output signals indicative that a signal within a predetermined pass band has been received. Also provided is a data store for storing the required instruction and control words as well as the output signals form the filter circuits. In addition, a signal generating circuit is responsive to predetermined clock signals to generate substantially sinusoidal signals each having a frequency directly proportional to the pulse repetition frequency of the respective clock signal.</p> |
