Browse Prior Art Database

HIGH ACCURACY FAST FREQUENCY COUNTER

IP.com Disclosure Number: IPCOM000006577D
Original Publication Date: 1992-Aug-01
Included in the Prior Art Database: 2002-Jan-16

Publishing Venue

Motorola

Related People

Authors:
Kazimierz (Kai) Siwiak

Abstract

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.