Measuring and testing – Speed – velocity – or acceleration – Centrifugal weight type
Patent
1976-03-01
1977-08-16
Queisser, Richard C.
Measuring and testing
Speed, velocity, or acceleration
Centrifugal weight type
73 672, 84454, G01H 1300, G10G 702
Patent
active
040417832
ABSTRACT:
A system for measuring the vibration frequency of a vibrating object useful for the adjustment of the vibration frequency of a piano string or like vibrating objects. In this system, the vibration of the vibrating object is converted to an electric signal, based on which signal is sought the difference between the vibration frequencies of any two adjacent harmonics of the vibrating object, i.e. the fundamental vibration frequency of the vibrating object is sought. The electric signal is led to a counter via a voltage-controlled variable band-pass filter. The middle frequency of the pass-band of this filter is controlled by a sweeper and varies continuously. For each agreement of this middle frequency of the pass-band with any one of the harmonics, the output of the filter presents a peak. The frequency corresponding to each peak is detected by a counter. The fundamental frequency is calculated from the difference between the frequencies corresponding to any adjacent peaks of the outputs of the filter.
In another aspect of the system, the electric signal of vibration discussed above is inputted respectively, to a pair of band-pass filters whose respective middle frequencies are selected so as to agree with the frequencies of any adjacent two harmonics, and the outputs are multiplied by a multiplier. From the multiplied signal is derived, through a low-pass filter, a lower frequency component which now has the aimed fundamental vibration frequency.
REFERENCES:
patent: 2393225 (1946-01-01), Andalikiewicz
patent: 2522924 (1950-09-01), Branson
patent: 3896697 (1975-07-01), Iannone
Onoda Takashi
Shimauchi Minoru
Beauchamp John P.
Nippon Gakki Seizo Kabushiki Kaisha
Queisser Richard C.
LandOfFree
System for measuring vibration frequency of vibrating object does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with System for measuring vibration frequency of vibrating object, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and System for measuring vibration frequency of vibrating object will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-353474