| 摘要 |
A digital tire pressure gauge with visual and voice response system is disclosed. The digital tire pressure gauge includes a pressure transducer, a pair of switching units, an integrator for generating a triangular waveform signal with an increasing ramp section and a decreasing ramp section, a comparator used to compare the triangular waveform signal of the integrator with a reference signal and then generate an output signal with a wave width corresponding to the increasing ramp section of the output signal of the integrator, a register for temporally storing the output signal of the comparator, a peak value detector, a holding circuit, a counting pulse generating circuit, a counting circuit, and a pressure value output buffer. A display is used to display the pressure value stored in the output buffer. A speech processing circuit is used to generate a speech signal accompanying with the display of the visual pressure value signal displayed on the display. A timer circuit is further coupled to the speech processing circuit for generating an actuating signal at preset regular intervals for triggering the speech processing circuit to play a predetermined reminding speech.
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