HIGH ACCURACY FAST FREQUENCY COUNTER
Original Publication Date: 1992-Aug-01
Included in the Prior Art Database: 2002-Jan-16
The frequency of a periodic signal may be deter- mined by counting zero crossings of the signal in a spe- chic interval, or by measuring the time period between two zero crossings of the signal. The first method is preferred for high frequency signals, while the second method is preferred for very low frequencies. In practi- cal cases, the best accuracy can be obtained by using a hybrid of the two counting methods, especially for sig- nals in the presence. of noise.