Abstract: Methods, systems, and apparatus, for an analog-to-digital converter. One system includes an MSB DAC array configured to generate respective sample values for one or more most-significant bits of an output ADC value, a first LSB DAC array configured to generate respective sample values for one or more least-significant bits of the output ADC value, a second LSB DAC array configured to generate respective sample values for the one or more least-significant bits of the output ADC value, wherein each DAC array in the first LSB DAC array and the second LSB DAC array is configured to alternate between generating an output ADC bit value and a mismatch error value for the output ADC bit value.

Abstract: Methods, devices, and computer-readable media are provided. An example method includes, when an electronic device is in a screen-off state, an optical proximity sensor in the device detects that the device is currently in an uncovered state, and a quantity of times that a touch panel of the device receives a touch event within a specified duration reaches a specified quantity of times, obtaining a current pose and a current motion status of the device. The method includes, when the current motion status of the device is a non-stationary state and the current pose of the device is a target pose, determining not to turn on the touch panel of the device. The target pose represents that an included angle between a plane on which the device is located and a straight line perpendicular to a horizontal plane is less than or equal to a specified angle threshold.

Abstract: A display control method includes obtaining a current proximity light status of the electronic device when a target function of an application is enabled, where the proximity light status indicates that an object is close to or far away from the electronic device. In this case, whether the electronic device is blocked may be determined based on a proximity light status of the electronic device. Then, when a display of the electronic device is in a screen-on state, if the current proximity light status changes compared with a previous proximity light status, and the current proximity light status indicates that an object is close to the electronic device, it indicates that the electronic device is blocked. Therefore, it is determined to delay, for preset duration, turning off the display.

Abstract: A method for enabling power-off payment includes detecting, by an electronic device, a shutdown signal, enabling a power-off payment service, and executing a shutdown operation when execution of an initialization operation on the power-off payment service is not completed and initialization duration is greater than a first duration threshold.

Abstract: A method and system for detecting dirt on an electrode of an electromagnetic flowmeter are provided. The method includes: under three different conditions acquiring resistance values between the electrode and ground to form a first dataset, second datasets, and a sample set to be tested; extracting a positive definite feature matrix corresponding to each sample batch and calculating a Riemann center thereof; calculating a similarity index between the sample feature matrix and each of the first feature matrices and second feature matrices; extracting/feature matrices with a largest similarity index, and calculating a local Riemann center thereof; and calculating proximity between the local Riemann center and each of the second Riemann centers, and determining that a Riemann center with the greatest proximity corresponds to dirt on the electrode corresponding to the sample set to be tested. The method can achieve online rapid detection of dirt on the electrode.

Abstract: A method and system for detecting dirt on an electrode of an electromagnetic flowmeter are provided. The method includes: under three different conditions acquiring resistance values between the electrode and ground to form a first dataset, second datasets, and a sample set to be tested; extracting a positive definite feature matrix corresponding to each sample batch and calculating a Riemann center thereof; calculating a similarity index between the sample feature matrix and each of the first feature matrices and the second feature matrices; extracting l feature matrices with a largest similarity index, and calculating a local Riemann center thereof; and calculating proximity between the local Riemann center and each of the second Riemann centers, and determining that a Riemann center with the greatest proximity corresponds to dirt on the electrode corresponding to the sample set to be tested. The method can achieve a online rapid detection of dirt on the electrode.