Accurate interactive acoustic plate
First Claim
1. A device for acquiring the position coordinates of a source of mechanical waves optionally generated by an impact on the surface of a plate (PLQ) of finite dimensions comprising a set of acoustic sensors (PZT00 to PZT11) each formed of a pair of piezoelectric transducers (PZTa, PZTb) situated facing one another on either side of the plate, the device comprising processing means for determining the coordinates of the source by analyzing the difference in propagation times of the acoustic waves generated by the source to the various sensors, a device characterized in that, the processing means comprise in association with each sensor (PZT00 to PZT11) a respective electronic circuit comprising in cascade, means for digitizing the amplified signal around a predetermined frequency, and associated with means for limiting the digitization to a time window starting before the acoustic waves reach a sensor and ending after the acoustic waves have reached said sensor.
1 Assignment
0 Petitions
Accused Products
Abstract
The invention concerns a device for acquiring the position co-ordinates of a source of mechanical waves optionally generated by impacting the surface of a plate (PLQ) of finite dimensions comprising a set of acoustic sensors (PZT00 to PZT11) each formed by a pair of piezoelectric transducers (PZTa, PZTb) facing each other on either side of the plate, the device including processing means for determining the co-ordinates of the source by analysing the difference in propagation time of the acoustic waves generated by the source to the different sensors. Said device is characterised in that the processing means comprise combined with each sensor (PZT00 to PZT11) a respective electronic circuit including means mounted in cascade for digitizing the amplified signal around a predetermined frequency, associated with means for limiting the digitization to a time window starting before the acoustic waves reach a sensor and ending when the acoustic waves have reached said sensor.
75 Citations
25 Claims
- 1. A device for acquiring the position coordinates of a source of mechanical waves optionally generated by an impact on the surface of a plate (PLQ) of finite dimensions comprising a set of acoustic sensors (PZT00 to PZT11) each formed of a pair of piezoelectric transducers (PZTa, PZTb) situated facing one another on either side of the plate, the device comprising processing means for determining the coordinates of the source by analyzing the difference in propagation times of the acoustic waves generated by the source to the various sensors, a device characterized in that, the processing means comprise in association with each sensor (PZT00 to PZT11) a respective electronic circuit comprising in cascade, means for digitizing the amplified signal around a predetermined frequency, and associated with means for limiting the digitization to a time window starting before the acoustic waves reach a sensor and ending after the acoustic waves have reached said sensor.
Specification