Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1984-01-17
1987-03-17
Tokar, Michael J.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
328133, G01R 2314
Patent
active
046510893
ABSTRACT:
A method and apparatus for determining the frequency of an input signal. The input signal and a sampling signal having a sampling frequency f.sub.s to a sampling mixer to produce a first intermediate frequency signal. The first intermediate frequency signal is applied to a detector having a response frequency bandwidth of at least f.sub.s /2 to determine whether the frequency value of the input exceeds a threshold value. The frequency value of the sampling signal is changed from among a plurality of frequency values and applied to the mixer until one of such frequency values results in a second intermediate frequency signal in a predetermined frequency range which is smaller than and lying within the detector bandwidth. The second intermediate frequency signal is applied to a frequency counter which produces a count corresponding to the second intermediate frequency. The frequency of the input signal is calculated by utilizing the count of the second intermediate frequency, the value of the sampling frequency f.sub.s and the harmonic number of the sampling mixer which produced the count of the second intermediate frequency.
REFERENCES:
patent: 3913029 (1975-10-01), Iida
patent: 3991382 (1976-11-01), Caspari
patent: 4135243 (1979-01-01), Peregrino
patent: 4310891 (1982-01-01), Niki
Heinz Friedberg, an article from the German Periodical Nachrichten elektronik [Electronic Communications] entitled "Heterodyne-Umsetzer" ["Heterodyne Converter"], Dec., 1977, p. 345.
Ali Bologlu and Vernon A. Barber, an article in the Hewlett-Packard Journal entitled: "Microprocessor-Controlled Harmonic Heterodyne Microwave Counter also Measures Amplitudes", May, 1978, pp. 2 to 16.
Marconi Instruments Limited
Tokar Michael J.
LandOfFree
Frequency counting arrangement does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Frequency counting arrangement, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Frequency counting arrangement will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1790523