.~ With electromechanical transducer (e.g., piezoelectric crystal)
DEFINITION
Classification: 330/174
(under subclass 157) Subject matter wherein the coupling circuit between the two cascaded amplifier devices includes means to convert the electric signal to mechanical vibrations and means further to convert the mechanical vibrations back to electric signals, such means, generally, serving as either time or phase delay means or means to determine the transmission frequency of the coupling network.
(1) Note. The electromechanical transducer means in this subclass is distinguished from subject matter of subclass 60 above, wherein the amplifying device itself includes a magnetostrictive means electromechanical transducer. In this subclass, the electrical signal energy is not used to control another source of electrical energy applied to the transducer, but herein the electric signal, in being transmitted, is converted to mechanical energy and back to electrical energy.
SEE OR SEARCH THIS CLASS, SUBCLASS:
60, for amplifiers having magnetostrictive means.
185+, for amplifier input circuits including any having an electromechanical transducer. See (1) Note under subclass 157.
192, for amplifier output circuits including any having an electromechanical transducer. See (1) Note under subclass 157.
SEE OR SEARCH CLASS 333, Wave Transmission Lines and Networks,
148+, 186, and 187+ for delay lines using electromechanical transducers, and for wave filters using electromechanical transducers and piezo-electric types of such transducers, respectively. See the search notes under these subclasses.
