Abstract:

The effects of the noise source and its direction of Chinese speech average frequency spectrum on the in-telligibility of Chinese speech were discussed in different room acoustical characteristics and signal-to-noise ratio(SNR)conditions.The test signals were mixed with the noise signals in accordance with a given SNR and the in.telligibility was then rated by listeners.Th e results show that,in noise condition,the room acoustical characteris.tics in listening positions,the SNR and the direction of noise source all have significant effects on the intelligibilityof Chinese speech,and the efect of SNR is the most significant.Th e results also show that the intelligibility increa.ses with the improvement of the room acoustical characteristics in listening positions,the increase in SNR ,and the increase in the separate angle between the signal an d the noise.

Key words: Chinese speech, average~equency spectrum , noise, acoustical characteristic, signal-to-noise ratio, speech intelligibility