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以往国外的一些测量乐器音准的仪器大多是间接模拟式的,即首先用人工调节使仪器内部产生一个所需的频率,然后用这个频率去与乐器发出的音响频率比较,得出的误差或者用电表指示出来,或者用光栅或光码盘的移动来表示。使用这种仪器的最大缺点是每调一个音时必须扳动仪器的许多开关,特别是在测定未知音响频率时,往往要反复调节各种开关才能“对”出一个音来。
In the past, some foreign instruments measuring instrument sound level were mostly indirect analogue, that is, firstly, manual adjustment was used to generate a desired frequency inside the instrument, and then the frequency was used to compare with the sound frequency of the musical instrument to obtain the error The meter indicates it or it uses the movement of a raster or optical encoder. One of the biggest drawbacks of using this instrument is that it is necessary to move many switches of the instrument each time a tone is tuned. Especially when measuring the unknown audio frequency, it is often necessary to repeatedly adjust the various switches to make a “right” sound.