Early stenographers seem to take notes with handwritten symbols. After the popularization of computers, speed recorders are widely used. At present, there are Yahweh, E-Xun, Suoheng and other speed recorders. There are also keyboard shorthand, such as five pairs, flying glory, ultrasound and so on. However, the keyboard is not as efficient as quick recording, and the keyboard combination is mainly used. If you are interested, you can try free Pinyin, Little Fairy Alliance and Qin Code. The working principle of shorthand of speed recorder is two-handed tapping. Simply put, the left and right hands can type a syllable code at the same time. Usually you can type one word at a time, plus multiple words and simplified codes. In theory, if you press the key four times a second, you can type more than 200 words per minute. Ordinary typing requires about 8 to 12 keystrokes per second. The low, middle and high standards of stenographers are 140 words/minute, 180 words/minute and 220 words/minute. But this is just the basic skill. A really mature senior stenographer should not only press the key on his hand fast enough to impress himself sentence by sentence, but also have the ability to listen to the last sentence and put it down. Adapt to the unbalanced speed of variable-speed listening and playing, and input endurance 1 hour or more. In addition to the accuracy rate of more than 98%, you must also take a written test.