In order to improve subjects' discrimination of sound attributes, an ear training course is designed. The training includes: discrimination of a pure tone's frequency, the frequency changes, the sound level changes, the timbre of different musical instruments and the irregularity of frequency response etc. All the items were carried on in an interlaced order to avoid listening fatigue. Meanwhile some explanations of the psychoacoustic principles and many tests were also conducted. Totally 57 subjects divided into two groups took part in the training course for about 15 weeks. After the special ear training, most subjects made great progress with nearly 85% average correctness rates for all the items.
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