Horology: time measuring systems or devices – Time interval – Electrical or electromechanical
Patent
1987-12-23
1989-08-08
Roskoski, Bernard
Horology: time measuring systems or devices
Time interval
Electrical or electromechanical
307106, G04F 8700
Patent
active
048559709
ABSTRACT:
An object of the present invention is to provide a time interval measurement circuit having especially high time measurement precision and resolution in time interval measurement between two signals and requiring short measurement time. In order to achieve the above described object, a time interval measurement circuit according to the present invention comprises two parallel transmission lines, differential output drivers connected to both ends of said transmission lines, a plurality of potential difference sensing means so disposed between said transmission lines at predetermined intervals as to generate an output signal upon an excess of potential difference between said two transmission lines over a predetermined level, and means for detecting, on the basis of output signals supplied from said potential difference sensing means, which potential difference sensing means has generated an output signal. Owing to this configuration, the time resolution depends upon the disposition intervals of said potential difference sensing means, resulting in high resolution. The measurement time can also be shortened because it depends upon the time taken for the signal to propagate between both ends of the transmission line.
REFERENCES:
patent: 4165459 (1979-08-01), Curtice
patent: 4362394 (1982-12-01), Menlove
patent: 4613951 (1986-09-01), Chu
patent: 4719608 (1988-01-01), Genat et al.
patent: 4720822 (1988-01-01), Hansen
Hewlett Packard 5370A Universal Time Interval Counter Operating & Service Manual, (1979), pp. 8-29-8-31.
Hayashi Yoshihiko
Orihashi Ritsuro
Hitachi , Ltd.
Roskoski Bernard
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