| 摘要 |
<p>The firing circuit for an anti-tank mine includes an acoustic detector after which is mounted a pass-band filter and an amplifier, and a detector to identify the object. Mounted in parallel with the amplifier (7) there are a number of pass-band filters (9-14) each of which is adjusted to a particular range of frequencies. The amplitudes of the outputs of the pass-band filters are converted into digital form by a converter (22). They are then fed to a comparison circuit (23) for comparison with memorised values. When the majority of the signals coincide with the memorised values, the detector is free to release a detection signal. The frequencies covered by the device may range from several Hz to several kHz, the range being covered in octaves. The amplitudes provided by the filters may be explored by a multiplexer.</p> |
