时差N小时 蓝鲸是天生的歌唱家(上)（在线收听）

Did you know that blue whales sing their songs exactly on pitch, with unbelievable accuracy? Scientists at San Francisco State University analyzed over 4,000 blue whale songs off the coast of California. They found that all the whales produced a certain call type at exactly the same pitch — 16.02 Hertz. That’s about four octaves below middle C. Even more remarkable than the fact that all the whales sing certain notes at the same pitch, is how perfectly on pitch they always are. From note to note the whales only vary in pitch by half a percent difference. By comparison, the difference between C and C-sharp is six percent.

你知道吗？蓝鲸唱歌时音高十分准确。旧金山大学的科学家们分析了加利福尼亚海岸线附近的4000个蓝鲸的发声音频。他们发现蓝鲸能以相同的音高(16.02赫兹)发出某种特定声音。那正是C调下的八度音阶。更值得注意的事实是所有的蓝鲸都能用相同的音高唱歌，它们的音高总是完全相同。蓝鲸通过改变百分之一的音高来改变音符。对比显示，C调和C升调相差百分之六。