The stereo portable digital recorder, “TASCAM DR-05", as shown in Fig. 3 was used to record gunshot sounds. It has 96 kHz/24-bit high-resolution and provided left and right channels of data.
Figure 3. The digital recorder
III. FEATURE EXTRACTION In our experiments, the database consists of 80 audio files of gunshot sounds fired from 8 guns. Each gun was fired 10 times under the same conditions described in the preceding section. The amplitude waveforms of the audio files obtained from the 8 guns were shown in Fig. 4.