| 摘要 |
In a method in which the signal output of an acoustic wave device (22) is separated into desired and undesired components, an excitation signal to an input (12) of the acoustic wave device is periodically interrupted for durations based upon the time required for acoustic waves to travel from the input to the output (13) of the device. The duration of excitation is less than the time required for wave travel, allowing electro-magnetic interference (46) to complete its passage to the output before the arrival of acoustic wave energy. The non-simultaneous arrival of electromagnetic interference and acoustic wave-generated energy allows the electromagnetic interference to be gated from the output. Electrical switched (36 and 38) are employed, such as double-balanced mixers or PIN diode switches. The period of pulses for providing the interruptions of excitation is at least as great as the sum of the required time for acoustic wave travel and the time during which the device is excited. The switch for gating the output remains open during intervals in which the device is excited. <IMAGE> |
