Patents Assigned to KAPIK INC
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Patent number: 10790790Abstract: An audio amplifier system includes a delta-sigma modulator configured to receive an m-bit digital audio input signal and to generate a pulse density modulated signal based on the m-bit digital audio input signal. An analog power stage is coupled to the delta-sigma modulator to receive the pulse density modulated signal and amplify the pulse density modulated signal to generate an amplified pulse density modulated signal. A feedback circuit is coupled to the delta-sigma modulator and the analog power stage. The feedback circuit is configured to receive the amplified pulse density modulated signal and the pulse density modulated signal and to determine a digital error signal representative of a difference between the amplified pulse density modulated signal and the pulse density modulated signal. The feedback circuit is further configured to provide the digital error signal to the delta-sigma modulator for applying the digital error signal to a representation of the m-bit digital audio input signal.Type: GrantFiled: January 17, 2018Date of Patent: September 29, 2020Assignee: KAPIK INC.Inventors: Robert Neil McKenzie, William Martin Snelgrove, Wai Tung Ng
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Patent number: 9946418Abstract: A multi-touch sensing system and a method for estimating a location of at least one touch point are provided. The multi-touch sensing system includes a panel, a grid of conductor disposed on the panel, a driver array connected to the grid, a receiver array connected to the grid, a signal processing system, and a controller. The method involves transmitting drive signals to the grid, receiving signals from the grid, estimating a capacitance, and transforming the capacitance into touch coordinates.Type: GrantFiled: October 8, 2015Date of Patent: April 17, 2018Assignee: KAPIK INC.Inventor: William Martin Snelgrove
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Patent number: 9513651Abstract: A system and method to achieve low power and/or low supply operation of a delta-sigma modulator by taking advantage of the inherent virtual ground of the delta-sigma loop to make the input to a low power integrator small and largely independent of the input signal. This results in improved linearity of the integrator and relaxed constraints on the supply for the first stage integrator. The architecture also enables direct access to the quantization error of the feedback loop and thus can be used to either/or: 1. Calibrate the modulator, 2. Achieve reduced quantization noise, 3. Stabilize the loop by compensating for excess loop delay. Low voltage common-mode-feedback is also achieved using the techniques described.Type: GrantFiled: August 28, 2015Date of Patent: December 6, 2016Assignee: KAPIK INC.Inventors: Syed Imran Ahmed, James Andrew Cherry, William Martin Snelgrove
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Patent number: 9407236Abstract: A system and method for processing a signal with a filter employing FIR and/or IIR elements. The required controller function is decomposed into primary FIR and/or IIR elements and a compensation filter is provided to address the latency in the primary elements, which would result in undesired operation of the filter. Several configurations of suitable filters are discussed, including multi-rate filters and filters with reduced power requirements.Type: GrantFiled: February 18, 2014Date of Patent: August 2, 2016Assignee: KAPIK INC.Inventor: William Martin Snelgrove
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Patent number: 9112524Abstract: An analog to digital conversion system is disclosed which converts an analog signal to a digital representation thereof at a first sampling rate by distributing the analog signal to at least two signal paths, at least one signal path including a limiting mixer to mix the signal with a respective selected square wave and a smoothing (low pass) filter to filter the mixed signal before providing the mixed and filtered signal to a subconverter, the subconverter having a sampling rate less than the first sampling rate, and a digital matrix filter to combine the digital output of each subconverter to form a digital representation of the analog signal as sampled at the first rate.Type: GrantFiled: July 18, 2014Date of Patent: August 18, 2015Assignee: KAPIK INC.Inventor: William Martin Snelgrove
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Patent number: 8836550Abstract: A system and method of reducing the effects of nonidealities of ADCs in multipath converters is disclosed. The system and method employs a variety of measure and correction blocks to determine statistical properties of the output stream of the multipath converter and to apply corrections to the operation of the subconverters of the multipath converter based upon differences in the measured statistics and expected target values, either explicit or implicit, for those statistics. A variety of examples of possible measure and configuration blocks are disclosed, as is the cascading of the measure and correction blocks to correct multiple errors in the output of the multipath converter. Feedforward (purely digital) and feedback (analog and digital) solutions are both disclosed.Type: GrantFiled: February 1, 2011Date of Patent: September 16, 2014Assignee: Kapik Inc.Inventor: William Martin Snelgrove
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Patent number: 8803724Abstract: An analog to digital conversion system is disclosed which converts an analog signal to a digital representation thereof at a first sampling rate by distributing the analog signal to at least two signal paths, at least one signal path including a limiting mixer to mix the signal with a respective selected square wave and a smoothing (low pass) filter to filter the mixed signal before providing the mixed and filtered signal to a subconverter, the subconverter having a sampling rate less than the first sampling rate, and a digital matrix filter to combine the digital output of each subconverter to form a digital representation of the analog signal as sampled at the first rate.Type: GrantFiled: July 20, 2011Date of Patent: August 12, 2014Assignee: Kapik Inc.Inventor: William Martin Snelgrove
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Patent number: 8655936Abstract: A system and method for processing a signal with a filter employing FIR and/or IIR elements. The required controller function is decomposed into primary FIR and/or IIR elements and a compensation filter is provided to address the latency in the primary elements, which would result in undesired operation of the filter. Several configurations of suitable filters are discussed, including multi-rate filters and filters with reduced power requirements.Type: GrantFiled: June 23, 2009Date of Patent: February 18, 2014Assignee: Kapik Inc.Inventor: William Martin Snelgrove
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Publication number: 20130207822Abstract: An analog to digital conversion system is disclosed which converts an analog signal to a digital representation thereof at a first sampling rate by distributing the analog signal to at least two signal paths, at least one signal path including a limiting mixer to mix the signal with a respective selected square wave and a smoothing (low pass) filter to filter the mixed signal before providing the mixed and filtered signal to a subconverter, the subconverter having a sampling rate less than the first sampling rate, and a digital matrix filter to combine the digital output of each subconverter to form a digital representation of the analog signal as sampled at the first rate.Type: ApplicationFiled: July 20, 2011Publication date: August 15, 2013Applicant: KAPIK INC.Inventor: William Martin Snelgrove
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Publication number: 20120293348Abstract: A system and method of reducing the effects of nonidealities of ADCs in multipath converters is disclosed. The system and method employs a variety of measure and correction blocks to determine statistical properties of the output stream of the multipath converter and to apply corrections to the operation of the subconverters of the multipath converter based upon differences in the measured statistics and expected target values, either explicit or implicit, for those statistics. A variety of examples of possible measure and configuration blocks are disclosed, as is the cascading of the measure and correction blocks to correct multiple errors in the output of the multipath converter. Feedforward (purely digital) and feedback (analog and digital) solutions are both disclosed.Type: ApplicationFiled: February 1, 2011Publication date: November 22, 2012Applicant: KAPIK INCInventor: William Martin Snelgrove