Signal Processing by Parametric Interactions in an Acoustic Surface Wave Device.
Research and development technical rept.,
ARMY ELECTRONICS COMMAND FORT MONMOUTH N J
Pagination or Media Count:
A tutorial study of the acoustic surface wave signal processor, also known as a convolver, is presented. Frequency conversion and time compression occur when an input signal is fed into one port of the device and a reference signal is fed into the other port of the device. The output from the third port is at the sum frequency, and is defined as the convolution or correlation function of the input signals. Several ways in which this device can be used for signal processing, particularly in performing correlation and Fourier transformation, are presented. Convolver theory is given, with best results shown for semiconductor devices. Experimental results given for the Fourier transformation processing, show a good relationship to theory, and prove that it is now possible to perform this function in real time with arbitrary waveshapes. The convolver can perform a large number of signal processing functions with one basic, three port, acoustic surface wave delay line configuration, a significant achievement in flexibility. Of greatest importance is the performance of these functions in real time.
- Line, Surface and Bulk Acoustic Wave Devices