Data processing: measuring – calibrating – or testing – Measurement system – Time duration or rate
Patent
1997-10-02
2000-01-25
Hoff, Marc S.
Data processing: measuring, calibrating, or testing
Measurement system
Time duration or rate
702141, 702160, 702142, 368 10, 235105, G01C 2200, G04F 1000
Patent
active
060187050
ABSTRACT:
The time period that a foot is in contact with the ground during a stride taken by a user, and the period that the foot is not in contact with the ground between strides taken by the user are determined by processing and analyzing the output signal of an accelerometer. The accelerometer is mounted on the user such that its acceleration sensing axis senses acceleration in a direction substantially parallel to the bottom of the user's foot. The output of the accelerometer is high-pass filtered, amplified, and fed to the input of a micro-controller, which monitors the signal for positive and negative signal spikes that are indicative, respectively, of the moment that the foot of the user leaves the ground and the moment that the foot impacts with the ground. By measuring time intervals between these positive and negative spikes, average "foot contact times" and "foot loft times" of the user may be calculated. To derive the pace of the user, the average foot contact time is multiplied by a first constant if it is less than 400 milli-seconds (ms) and is multiplied by a second constant if it is greater than 400 ms. This pace value may, in turn, be used to calculate the distance traveled by the user.
REFERENCES:
patent: 3972038 (1976-07-01), Fletcher et al.
patent: 3974491 (1976-08-01), Sipe
patent: 4408183 (1983-10-01), Wills
patent: 4409992 (1983-10-01), Sidorenko et al.
patent: 4499394 (1985-02-01), Koal
patent: 4578769 (1986-03-01), Frederick
patent: 4649552 (1987-03-01), Yukawa
patent: 4651446 (1987-03-01), Yukawa et al.
patent: 4745564 (1988-05-01), Tennes et al.
patent: 4763287 (1988-08-01), Gerhaeuser et al.
patent: 4771394 (1988-09-01), Cavanagh
patent: 4774679 (1988-09-01), Carlin
patent: 4814661 (1989-03-01), Ratzlaff et al.
patent: 4830021 (1989-05-01), Thornton
patent: 4855942 (1989-08-01), Bianco
patent: 4956628 (1990-09-01), Furlong
patent: 5033013 (1991-07-01), Kato et al.
patent: 5186062 (1993-02-01), Roost
patent: 5269081 (1993-12-01), Gray
patent: 5285586 (1994-02-01), Goldston et al.
patent: 5323650 (1994-06-01), Fullen et al.
patent: 5343445 (1994-08-01), Cherdak
patent: 5357696 (1994-10-01), Gray et al.
patent: 5361778 (1994-11-01), Seitz
patent: 5422628 (1995-06-01), Rodgers
patent: 5437289 (1995-08-01), Liverance et al.
patent: 5452269 (1995-09-01), Cherdak
patent: 5485402 (1996-01-01), Smith et al.
patent: 5526290 (1996-06-01), Kanzaki
patent: 5541860 (1996-07-01), Takei et al.
patent: 5583776 (1996-12-01), Levi et al.
patent: 5623944 (1997-04-01), Nashner
patent: 5636146 (1997-06-01), Flentovet al.
patent: 5720200 (1998-02-01), Anderson et al.
patent: 5724265 (1998-03-01), Hutchings
Blackadar Thomas P.
Gaudet Paul J.
Oliver Steven R.
Hoff Marc S.
Personal Electronic Devices, Inc.
Vo Hien
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