| 摘要 |
The transducer with an amplifier is in combination with an active electronic circuit which receives electric signals from it and which can emit corresponding electrical signals itself. The electronic circuit has at least two accessible terminals, between which is an electrical connection which forms part of the circuit. - The electrical connection can be a short circuit of a passive impedance, which forms part of the circuit, or a series connection to a passive impedance, which is disconnected from the circuit.
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