| 摘要 |
A leak-noise-detecting data logger (101) includes: a case (102), an acoustic transducer (103), a communications antenna (104), an analogue to digital converter (105), a microprocessor (106), a clock (107), a memory (108) and a communications module (109), a radio signal reception antenna (121) separate from the communication antenna; a radio receiver (122) connected to the antenna and arranged to be switched on and off immediately before and after logging by the microprocessor, a demodulation circuit (123) in the receiver and arranged to output an audio signal from the receiver, an electronic switch (124) again switched by the microprocessor for switching the modulation from the radio receiver to the A-to-D converter (105) or the transducer output to the A-to-D converter. |
