.~ Delay lines including elastic surface wave propagation means {5}
152
.~.~ Variable delay
DEFINITION
Classification: 333/152
Variable delay:
(under subclass 150) Subject matter including means for varying the delay.
(1) Note. Delay variation may be achieved by mechanical translation of the input and output transducers used for electromechanical conversion or by including surface wave propagation substrates whose delay properties are altered by incident radiation, electron bombardment, or by the application of external field, forces, or control voltages.
(2) Note. The substrate material may include materials or coatings which are both semiconductive and piezoelectric, are both photosensitive and piezoelectric, or undergo significant dimensional changes or deformation as a function of externally applied heat or mechanical stress.
