Displaying walking signals variously rotated, estimating variance, vertical, lateral direction
First Claim
1. A process responsive to an accelerometer and a device-heading sensor unit, the process comprising:
- generating signals representing components of acceleration acquired from said accelerometer;
electronically processing at least some part of the signals to produce walking step signals and an estimation of attitude of a user motion with respect to the accelerometer, and further to combine the attitude estimation with a device heading estimation responsive to said device-heading sensor unit, to produce a user heading estimation;
electronically rotating through various rotations said at least part of the signals, estimating a parameter of the signals related to variance, and estimating a vertical direction and a lateral user direction where the parameter is substantially maximum and where it is substantially minimum respectively; and
portably displaying a visual path of walking jointly based on said walking step signals, attitude estimation and device heading estimation.
0 Assignments
0 Petitions
Accused Products
Abstract
A user-heading determining system (10) for pedestrian use includes a multiple-axis accelerometer (110) having acceleration sensors; a device-heading sensor circuit (115) physically situated in a fixed relationship to the accelerometer (110); an electronic circuit (100) operable to generate signals representing components of acceleration sensed by the accelerometer (110) sensors, and to electronically process at least some part of the signals to produce an estimation of attitude of a user motion with respect to the accelerometer, and further to combine the attitude estimation (750, α) with a device heading estimation (770, ψ) responsive to the device-heading sensor circuit, to produce a user heading estimation (780); and an electronic display (190) responsive to the electronic circuit (100) to display information at least in part based on the user heading estimation. Other systems, circuits and processes are also disclosed.
-
Citations
11 Claims
-
1. A process responsive to an accelerometer and a device-heading sensor unit, the process comprising:
-
generating signals representing components of acceleration acquired from said accelerometer; electronically processing at least some part of the signals to produce walking step signals and an estimation of attitude of a user motion with respect to the accelerometer, and further to combine the attitude estimation with a device heading estimation responsive to said device-heading sensor unit, to produce a user heading estimation; electronically rotating through various rotations said at least part of the signals, estimating a parameter of the signals related to variance, and estimating a vertical direction and a lateral user direction where the parameter is substantially maximum and where it is substantially minimum respectively; and portably displaying a visual path of walking jointly based on said walking step signals, attitude estimation and device heading estimation. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
-
Specification