So, now, what came probably before this paragraph was a paragraph about the phonautograph, which is a type of machine that was invented a long time ago to record sound.
所以，现在，可能出现在这一段之前的是一段关于 phonautograph 的段落，这是一种很久以前发明的用于记录声音的机器。
phonautograph
/fo'nɔtəɡræf/
英汉-汉英词典
n. 声波记振仪;声波振动记录[图表]
词组 | 习惯用语
您要查找的是不是：
- photograph n. 相片 vi. 拍照，摄影；被照相 vt. 给 ... 照相
- photographer n. 摄影师
- phonograph n. 留声机
- pantograph n. 缩放仪,伸缩绘图器
phonautograph n. 语音描记器；声波记振仪
网络短语:
phonautograph system 语音记录系统
原声例句
Engvid-Adam-课程合辑
英语百科
Phonautograph
The phonautograph is the earliest known device for recording sound. Previously, tracings had been obtained of the sound-producing vibratory motions of tuning forks and other objects by physical contact with them, but not of actual sound waves as they propagated through air or other media. Invented by Frenchman Édouard-Léon Scott de Martinville, it was patented on March 25, 1857. It transcribed sound waves as undulations or other deviations in a line traced on smoke-blackened paper or glass. Intended solely as a laboratory instrument for the study of acoustics, it could be used to visually study and measure the amplitude envelopes and waveforms of speech and other sounds, or to determine the frequency of a given musical pitch by comparison with a simultaneously recorded reference frequency.
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