Hal Philipp, CEO of Quantum Research Group, the
charge-transfer (QT) capacitive touch company, has been granted both
US and European patents for a technology that eliminates ambiguity
between adjacent keys in touch keypads and keyboards. The technique,
known as adjacent key suppression (trademarked AKS(TM)), uses an
iterative technique that repeatedly measures a detected signal
strength associated with each key, compares all the measured signal
strengths to find a maximum signal change, then determines that the
maximum signal change comes from the user-selected key. AKS then
suppresses or ignores signals from all other keys as long as the
signal from the selected key signal change remains above a nominal
threshold value.
The technique was developed for keyboards using Quantum's patented charge-transfer sensing technology but is applicable to other kinds of non-bi-stable touch sensors including ones based on piezoelectric sensors. It is particularly important for smaller keyboards and keypads, such as those found on mobile phones and remote controls, where the user's fingertip may be large enough to cover more than one key at a time. AKS ensures that the key which is covered most by the fingertip is determined to be the required one and that there is no false triggering of nearby keys.
The technique was developed for keyboards using Quantum's patented charge-transfer sensing technology but is applicable to other kinds of non-bi-stable touch sensors including ones based on piezoelectric sensors. It is particularly important for smaller keyboards and keypads, such as those found on mobile phones and remote controls, where the user's fingertip may be large enough to cover more than one key at a time. AKS ensures that the key which is covered most by the fingertip is determined to be the required one and that there is no false triggering of nearby keys.
© 2005 Business Wire
