| 摘要 |
PURPOSE: A latch-testing circuit of ire electro mechanical converter is provided to extend or reduce the characteristic time constant of the sensor signal of the piezo element with the parallel circuit, and to demand the extension of the time constant to offer the signal to the comparator block without processing artificially. CONSTITUTION: The latch testing circuit(100) of the tire electro mechanical converter includes: a sensor signal input unit(106); a sensitivity adjusting unit(108); and an evaluation unit(110). In the sensor signal input unit, the electric sensor signal according to the time of the electro mechanical converter(102) is provided. The sensor signal can generate with the distortion of the electro mechanical converter while passing through the latch of the tire(104). The sensitivity adjusting unit is based on the intensity of the sensor signal and is installed so that the whole sensor signal can be evaluated by the method of sensitivity adjustment. The evaluation unit is based on the sensor signal which is offered in the input sensitivity adjustment and evaluates the sensor signal of the converter which is installed to generate the evaluation signal representing the latch of the tire. The sensitivity adjusting unit includes the variation amplifier. The sensor signal can be provided in the variation amplifier. The amplification factor of the variation amplifier can be changed by the control signal.
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