Patent ID: 11928894
Assignee: ORIGIN WIRELESS, INC.
Field: Computer technology (Electrical engineering)
Classification: CPC G  H | IPC G  H

Claim 9:
10. The system of claim 6, wherein:
the at least one motion feature is associated with at least one of: a time stamp in the time window and at least one motion cycle; and
the at least one motion feature comprises at least one of the following stride-related features:
a motion speed, a motion acceleration being a derivative of motion speed, a stride length being an integration of motion speed over a motion cycle around the time stamp, a stride period being duration of the motion cycle, a stride frequency being inversely proportion to the stride period, a stride-wise mean speed being A-average of motion speed in the motion cycle, wherein A-average comprises at least one of: an average, a weighted average and a trimmed mean,
a stride-wise max speed being maximum motion speed in the motion cycle, a stride-wise min speed being minimum motion speed in the motion cycle, a stride-wise speed variance being variance of motion speed in the motion cycle, a stride-wise speed deviation being X-percentile of sample distribution of mean-subtracted speed in the motion cycle, wherein the mean-subtracted speed is motion speed minus a stride-wise mean speed and X is a number between 0 and 100,
a stride-wise mean acceleration being A-average of motion acceleration in the motion cycle, a stride-wise max acceleration being maximum motion acceleration in the motion cycle, a stride-wise min acceleration being minimum motion acceleration in the motion cycle, a stride-wise acceleration variance being variance of motion acceleration in the motion cycle, a stride-wise acceleration deviation being X-percentile of sample distribution of mean-subtracted acceleration in the motion cycle, wherein the mean-subtracted acceleration is motion acceleration minus a stride-wise mean acceleration,
a stride feature (SF) being at least one of: a stride length, stride period, stride frequency, stride-wise mean speed, stride-wise max speed, stride-wise min speed, stride-wise speed variance, stride-wise speed deviation, stride-wise speed peak variance, stride-wise speed valley variance, k-th stride-wise speed-ACF-peak (k-SSAP), mean k-SSAP, k-SSAP variance, k-SSAP difference (k-SSAPD), mean k-SSAPD, k-SSAPD variance, stride-wise speed-ACF-peak-count (SSAPC), mean SSAPC, SSAPC variance, SSAPC-pdf, SSAPC-difference (SSAPCD), mean SSAPCD, SSAPCD variance, stride-wise speed recurrent plot (SSRP), SSRP feature, stride-wise time-scaled speed ACF (STSSA) feature, stride-wise speed harmonic ratio, stride-wise speed harmonic feature, stride-wise generalized speed harmonic feature, stride-wise speed symmetry measure, stride-wise mean acceleration, stride-wise max acceleration, stride-wise min acceleration, stride-wise acceleration variance, stride-wise acceleration deviation, stride-wise speed peak variance, stride-wise speed valley variance, k-th stride-wise acceleration-ACF-peak (k-SAAP), mean k-SAAP, k-SAAP variance, k-SAAP difference (k-SAAPD), mean k-SAAPD, k-SAAPD variance, stride-wise acceleration-ACF-peak-count (SAAPC), mean SAAPC, SAAPC variance, SAAPC-pdf, SAAPC-difference (SAAPCD), mean SAAPCD, SAAPCD variance, stride-wise acceleration RP (SARP), SARP feature, stride-wise time-scaled acceleration ACF (STSAA) feature, stride-wise acceleration harmonic ratio, stride-wise acceleration harmonic feature, stride-wise generalized acceleration harmonic feature, stride-wise symmetry measure, a function of at least one of the above statistics, a function of another statistics, and a function of another SF,
a mean SF being A-average of the SF in a subwindow of the time window around the time stamp, wherein the subwindow is at least one of: the whole time window, a sliding window, at least one motion cycle, at least one step segments and another subwindow,
an odd mean SF being A-average of the SF of odd motion cycles in the subwindow, an even mean SF being A-average of the SF of even motion cycles in the subwindow, a max SF being maximum of the SF in the subwindow, an odd max SF being maximum of the SF of odd motion cycles in the subwindow, an even max SF being maximum of the SF of even motion cycles in the subwindow, a min SF being minimum of the SF in the subwindow, an odd min SF being minimum of the SF of odd motion cycles in the subwindow, an even min SF being minimum of the SF of even motion cycles in the subwindow, a SF variance being variance of SF in the subwindow, an odd SF variance being variance of SF of odd motion cycles in the subwindow, an even SF variance being variance of SF of even motion cycles in the subwindow, a SF deviation being X-percentile of sample distribution of mean-subtracted SF in the subwindow, wherein the mean-subtracted SF is SF minus mean SF, an odd SF deviation being X-percentile of sample distribution of mean-subtracted SF of odd motion cycles in the subwindow, an even SF deviation being X-percentile of sample distribution of mean-subtracted SF of even motion cycles in the subwindow,
statistics of SF being at least one of: mean SF, max SF, min SF, SF variance, SF deviation, and another statistics of SF,
odd statistics of SF being at least one of: odd mean SF, odd max SF, odd min SF, odd SF variance, odd SF deviation, and another odd statistics of SF,
even statistics of SF being at least one of: even mean SF, even max SF, even min SF, even SF variance, even SF deviation, and another even statistics of SF,
a left SF, right SF, front left SF, front right SF, back left SF, back right SF, wavefront SF, odd wavefront SF, even wavefront SF, a ratio of even statistics of SF and odd statistics of SF, a difference of even statistics of SF and odd statistics of SF, a similarity measure of even statistics of SF and odd statistics of SF, a function of at least one of: statistics of SF, odd statistics of SF, and even statistics of SF, a ratio of a function of even statistics of SF and a function of odd statistics of SF, a first function of: a second function of even statistics of SF and a third function of odd statistics of the SF,
and another statistics of the SF.