Same spectral profile appears at intervals of 10-100ms. Many random peaks spread both time and freqency axes. Sound of whistle or electronic sound continuous oscillation of narrow band peak. We developed a prototype system that recognize ten types of impluse sounds as onomatopoeia. Spectrum with 256 points FFT is calculated by DSP at intervals of 4ms.
Sound event is detected by extracting period of high power.
The maximum peak is searched in the smoothened spectrogram. Then, classification rules obtained by cognitive experiments classicies into onomatopoeia. Total recognition time is about 500ms. See the following page to get minute information about recording conditions, list of sounds, and distribution. We measured 80 types of sound sources using a standard microphone as a dry source data in unechoic room.