The speech banana represents an audiogram (a graph that shows the results of hearing test) and shows the noise level and frequency of many familiar sounds. As we can see from the diagram, rock bands and jet aeroplanes are very loud, producing sounds at around the 120 decibel level, while a dripping tap and whispering is around the 10-20 decibel level. The shaded area is sometimes called the “Speech Banana”. Normally spoken speech sounds fall within the banana shaped area. Normal speech is spoken at around 30-50 decibel level, with individual sounds varying in frequency.
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