Schmid K, Böhmer G
Electroencephalogr Clin Neurophysiol. 1985 Jan;60(1):90-2. doi: 10.1016/0013-4694(85)90955-1.
The instantaneous frequency meter described uses an inexpensive hybrid module for on-line interval to frequency conversion and also has a digital low pass filter function. The device is not only a frequency to voltage converter but also is well suited to serve as an interface to a digital computer.
所描述的瞬时频率计采用一个廉价的混合模块进行在线间隔到频率的转换，并且还具有数字低通滤波器功能。该设备不仅是一个频率到电压的转换器，而且非常适合用作与数字计算机的接口。
