听力曲线 [
tīng lì qū xiàn]
audiogram
audiometric curve
- 这大致是说,耳机频响曲线在低频40-500赫兹间有个小的隆起是正常的,因为耳机不能象喇叭那样给人真实的低频冲击力,所以在这个低频段加强一些,声音反而自然逼真些.另外,为避免太刺激耳朵,耳机在1000赫兹起到耳朵听力的极限20000赫兹间应该有衰减,到2万赫兹处比平均输出低8-10分贝是正常现象.
A natural sounding headphone should have a gentle hump in the bass (about 3 or 4 dB) between 40Hz and 500Hz. (This compensates for the fact that headphones don't give you the physical punch that the sound from a speaker has; so a slight compensation of increased bass is needed for natural sound.) Headphones also need to be rolled off in the highs to compensate for the drivers being so close to the ear; a gently sloping flat line from 1kHz to about 8-10dB down at 20kHz is about right.