Phase compensation for multi-stimulus controller
AssigneeApple Inc.
InventorChristoph H. Krah
Life of this patent
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Abstract
Determining a compensated phase matrix for a multi-stimulus demodulation process is provided. A first drive line of a multi-stimulus sensing system is selected, and a stimulation signal is transmitted on the selected drive line. A channel gain resulting from the stimulation signal is measured from a received sense signal resulting from the stimulation signal. The measured channel gain is compared with a known channel gain to obtain an individual phase compensation for the selected drive line. A compensated phase matrix is formed of the individual phase compensation values for multiple drive lines.
Claims6
A method of determining a compensated phase matrix for a multi-stimulus demodulation process, the method comprising:
- measuring individual phase delays of each drive line and sense line combination of a multi-stimulus sensing system;
- and
- forming the compensated phase matrix based on the individual phase delays.
A method of determining a phase adjusted decode matrix for a multi-stimulus demodulation and decode process, the method comprising:
- selecting a first drive line and first channel;
- transmitting a stimulation signal on the selected drive line;
- adjusting the first channel phase until the demodulated signal becomes maximum, and recording the adjusted phase at the maximum;
- repeating the selecting, transmitting, and adjusting for other combinations of drive lines and sense lines to determine corresponding other phases;
- determining phase adjustments for all channels based on the determined phases;
- and
- forming the phase adjusted decode matrix based on the phase adjustments.
Dependencies are inferred from the claim text.