Adaptive stylus receiver to adaptively determine presence of narrowband interference and its suppression
a receiver and adaptive technology, applied in the field of stylus, can solve the problems of low amplitude signals, low signal decoding efficiency, and interference signals in serial information received by the stylus, and achieve the effect of improving the signal-to-noise ratio and increasing the length of the pn sequen
Active Publication Date: 2022-05-12
CIREL SYST
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AI Technical Summary
Benefits of technology
The patent describes a receiver that can filter out a narrow band interference signal in the communication between a touch panel and a stylus. The method also improves the Signal to Noise Ratio by increasing the length of the PN sequence without affecting the performance of the stylus. This allows for better signal quality during touch panel communication.
Problems solved by technology
Often, the serial information received by the stylus can include interference signals.
The receiver circuit in the stylus may fail to decode the signal received from the touchscreen panel.
In presence of a narrowband interference, signals that are low in amplitude are difficult to decode.
However, this increases the power consumption of the touchscreen panel.
However, this would increase the power consumption as well as the silicon area of the correlation receiver.
Method used
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[0020]For the purpose of promoting an understanding of the principles of the disclosure, reference will now be made to the embodiment illustrated in the figures and specific language will be used to describe them. It will nevertheless be understood that no limitation of the scope of the disclosure is thereby intended. Such alterations and further modifications to the disclosure, and such further applications of the principles of the disclosure as described herein being contemplated as would normally occur to one skilled in the art to which the disclosure relates are deemed to be a part of this disclosure.
[0021]It will be understood by those skilled in the art that the foregoing general description and the following detailed description are exemplary and explanatory of the disclosure and are not intended to be restrictive thereof.
[0022]In the present disclosure, relational terms such as first and second, and the like, may be used to distinguish one entity from the other, without nece...
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Disclosed is an adaptive stylus receiver to adaptively determine presence of narrowband interference. The receiver comprises an analog-to-digital converter to digitize an incoming digitally modulated (DM) signal at a predetermined sampling frequency, a digital band pass filter configured to receive digitized DM signal and to generate a first set of frequencies from the digitized DM signal, and a frequency detection logic to adaptively determine presence of narrowband interference in a first set of frequencies, the frequency detection logic configured to estimate frequency components from the first set of frequencies, provide a first set of coefficients to a narrowband notch filter, binning of coefficients for frequencies below a threshold value, adaptively estimate narrowband notch filter coefficients by binning and provide estimated narrowband notch filter coefficients to the narrowband notch filter to suppress the narrow band interference from the first set of frequencies.
Description
FIELD OF THE INVENTION[0001]The present disclosure generally relates to a stylus, and more particularly relates to an adaptive stylus receiver to adaptively determine presence of narrowband interference and its suppression.BACKGROUND OF THE INVENTION[0002]In computing, stylus is a pen shaped input device that can be used to write, draw pictures or to select objects on a touchscreen panel. Some of the latest stylus communication protocols support two way communications with the touchscreen panel. The stylus has a receiver circuit which decodes the serial information sent by the touchscreen panel. Often, the serial information received by the stylus can include interference signals. This is because the electrical ground of the stylus and that of the touchscreen panel are not electrically shorted. Thus, the stylus can pick up the receive signal along with any interfering signal from the touchscreen due to the different electrical grounds of the touchscreen and the stylus. The receiver ...
Claims
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IPC IPC(8): G06F3/038G06F3/0354
CPCG06F3/0383G06F3/03545H04B1/1036G06F3/04162
Inventor DAS, AKASHDIPLAKKIMSETTI, LEELA MADHAV
Owner CIREL SYST