A surface wave convolver has been fabricated and tested with an interdigital structure which serves both as the output transducer for the convolution signal and as the biasing electrodes for bidirectional surface wave amplification of the two countertraveling input signals. The structure consists of a CdSe film on aY ZLiNbO3substrate with a delay path of 5 &mgr;sec. A convolution efficiency of −16 dB m has been obtained. Time reversal has been performed with the device.