Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1975-02-21
1976-07-20
Krawczewicz, Stanley T.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
G01R 2700
Patent
active
039709264
ABSTRACT:
A method and an apparatus for measuring group delay characteristics of a transmission path is disclosed wherein a test signal is fed to the input of the transmission path and the test signal is amplitude modulated by a split frequency. The carrier frequency of the test signal is interchanged periodically between a measuring frequency and a standard reference frequency. The output measuring and reference signals of the transmission path are sensed by noting the positions in time of specified points of the envelope waveform that occur during the periods of the reference type signal and the measurement type signal. A digital pulse counter is provided for measuring a first time interval between a specified point during a period of a first type signal and a specified point during the subsequent period of the second type of signal, and for measuring a second time interval between the latter specified point and a specified point during the subsequent period of the first type of signal. The pulse counter is bidirectional and is reversed at the end of the first time interval. The counter state at the termination of counting represents the difference between the first and the second time intervals and thus the group delay to be measured.
REFERENCES:
patent: 3414809 (1968-12-01), Hoffmann et al.
patent: 3573611 (1969-01-01), Bergemann
patent: 3913011 (1975-10-01), Hughes et al.
Guest David Hubert
Hodgson Ralph
Rigby Peter Anthony
Griffin Roland I.
Hewlett-Packard Limited
Jones Allston L.
Krawczewicz Stanley T.
LandOfFree
Method and apparatus for measuring the group delay characteristi does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method and apparatus for measuring the group delay characteristi, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus for measuring the group delay characteristi will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-559438