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

Claim 8:
9. The system of claim 6, wherein:
the at least one motion feature is associated with a time stamp in the time window and the at least one step segment (SSeg); and
the at least one motion feature comprises at least one of the following step-related features:
a motion speed, a motion acceleration being a derivative of motion speed,
a step length being an integration of motion speed over a SSeg around the time stamp, a step period being duration of the SSeg, a step frequency being inversely proportion to the step period, a stepwise mean speed being A-average of motion speed in the SSeg, wherein A-average comprises at least one of: an average, a weighted average and a trimmed mean,
a stepwise max speed being maximum motion speed in the SSeg, a stepwise min speed being minimum motion speed in the SSeg, a stepwise speed variance being variance of motion speed in the SSeg, a stepwise speed deviation being X-percentile of sample distribution of mean-subtracted speed in the SSeg, wherein the mean-subtracted speed is motion speed minus a stepwise mean speed and X is a number between 0 and 100,
a stepwise mean acceleration being A-average of motion acceleration in the SSeg, a stepwise max acceleration being maximum motion acceleration in the SSeg, a stepwise min acceleration being minimum motion acceleration in the SSeg, a stepwise acceleration variance being variance of motion acceleration in the SSeg, a stepwise acceleration deviation being X-percentile of sample distribution of mean-subtracted acceleration in the SSeg, wherein the mean-subtracted acceleration is motion acceleration minus a stepwise mean acceleration,
a step feature (SF) being at least one of: a step length, step period, step frequency, stepwise mean speed, stepwise max speed, stepwise min speed, stepwise speed variance, stepwise speed deviation, stepwise speed peak variance, stepwise speed valley variance, k-th stepwise speed-ACF-peak (k-SSAP), mean k-SSAP, k-SSAP variance, k-SSAP difference (k-SSAPD), mean k-SSAPD, k-SSAPD variance, stepwise speed-ACF-peak-count (SSAPC), mean SSAPC, SSAPC variance, SSAPC-pdf, SSAPC-difference (SSAPCD), mean SSAPCD, SSAPCD variance, stepwise speed recurrent plot (SSRP), SSRP feature, stepwise time-scaled speed ACF (STSSA) feature, stepwise speed harmonic ratio, stepwise speed harmonic feature, stepwise generalized speed harmonic feature, stepwise speed symmetry measure, stepwise mean acceleration, stepwise max acceleration, stepwise min acceleration, stepwise acceleration variance, stepwise acceleration deviation, stepwise speed peak variance, stepwise speed valley variance, k-th stepwise acceleration-ACF-peak (k-SAAP), mean k-SAAP, k-SAAP variance, k-SAAP difference (k-SAAPD), mean k-SAAPD, k-SAAPD variance, stepwise acceleration-ACF-peak-count (SAAPC), mean SAAPC, SAAPC variance, SAAPC-pdf, SAAPC-difference (SAAPCD), mean SAAPCD, SAAPCD variance, stepwise acceleration RP (SARP), SARP feature, stepwise time-scaled acceleration ACF (STSAA) feature, stepwise acceleration harmonic ratio, stepwise acceleration harmonic feature, stepwise generalized acceleration harmonic feature, stepwise 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 SSeg and another subwindow,
an odd mean SF being A-average of the SF of odd SSegs in the subwindow, an even mean SF being A-average of the SF of even SSegs 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 SSegs in the subwindow, an even max SF being maximum of the SF of even SSegs 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 SSegs in the subwindow, an even min SF being minimum of the SF of even SSegs in the subwindow, a SF variance being variance of SF in the subwindow, an odd SF variance being variance of SF of odd SSegs in the subwindow, an even SF variance being variance of SF of even SSegs 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 SSegs in the subwindow, an even SF deviation being X-percentile of sample distribution of mean-subtracted SF of even SSegs 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 the SF and odd statistics of the SF, a difference of even statistics of the SF and odd statistics of the SF, a similarity measure of even statistics of the SF and odd statistics of the 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 the SF and a function of odd statistics of the SF, a first function of a second function of even statistics of the SF and a third function of odd statistics of the SF,
and another statistics of the SF.