Contact sensitive device
AssigneeNew Transducers Limited
InventorDarius Sullivan
Life of this patent
Estimating the term…
Abstract
A contact sensitive device includes a member capable of supporting bending waves, a first sensor mounted on the member for measuring bending wave vibration in the member, the sensor determining a first measured bending wave signal, a second sensor to determine a second measured bending wave signal and a processor that optimises a product of a set of corrected impulse response measurements from each sensor to determine information related to a contact.
Claims14
A method for determining information relating to a touch on a touch member capable of supporting bending waves, the touch member including a plurality of points with known locations, the method comprising:
- touching the points to create bending waves in the touch member;
- measuring the bending waves using sensors coupled to the touch member;
- determining a phase correction associated with each of the points from the bending waves created by touching the points;
- and
- using the phase corrections in determining information related to a subsequent touch on the touch member.
A method for determining information relating to a contact on a member capable of supporting bending waves comprising applying an empirically determined phase correction to a dispersion corrected correlation function used in processing measurements of bending waves in the member caused by the contact and measured by sensors coupled to the member.
A method for determining information relating to a contact on a member capable of supporting bending waves comprising:
- empirically determining phase corrections according to measured bending waves resulting from contacts made on points arranged in known locations on the member;
- and
- utilizing the phase corrections for dispersion corrected correlation calculations used in processing measurements of bending waves in the member caused by a subsequent contact of the member to determine the information related to the contact.
A contact sensitive device comprising:
- a member capable of supporting bending waves including a plurality of points with known locations;
- at least a first and second sensor mounted on the member for measuring bending wave vibration in the member;
- and
- a processor configured to determine a phase correction associated with each of the points from the bending waves created by touching the points.
The contact sensitive device as recited 13 wherein the empirical phase correction is calculated according to:
- ϕ
- 12
- *
-
- (
- ω
- )
- =
-
- ∑
- j
-
- W
- ^
- 1
- ,
- j
-
- (
- ω
- )
-
- W
- ^
- 2
- ,
- j
- *
-
- (
- ω
- )
-
- exp
-
- [
- -
- ⅈ
-
-
- k
-
- (
- ω
- )
-
- Δ
-
-
- x
- j
- ]
-
- ,
- where Δxj is the difference between the path lengths, x1,j & x2,j from the first and second sensors to the contact, Ŵ1,j(ω) and Ŵ*2,j(ω) are the Fourier transformation and complex conjugate Fourier transformation of the two measured bending wave signals W1(t) and W2(t);
- t represents time ω is 2πf where f is frequency;
- and k is a predetermined panel dispersion relation.
Dependencies are inferred from the claim text.