255 results about "Calibration instructions" patented technology

The invention relates to the technical field of a mobile terminal, and discloses a method and system for calibrating a proximity sensor of a mobile phone. The method comprises the steps of fixing the mobile phone with the proximity sensor on a test fixture, arranging a panel for simulating a barrier on the test fixture, and adjusting the distance between the panel and the tested mobile phone to a specified distance; connecting the mobile phone with a PC (Personal Computer); after the reception of a calibration instruction transmitted by a PC end through the mobile phone, starting the proximity sensor to induct the panel for simulating the barrier, and inducting to read out a corresponding ADC (Airborne Digital Computer) reading at the moment; and comparing the ADC reading with a preset value, judging whether the ADC reading exceeds the preset value, and if not, storing the ADC reading. According to the invention, the problem of differences between mobile phone sensors is solved, the consistency of threshold values of the mobile phone sensors is ensured, and the calibrating precision of the proximity sensor of the mobile phone is increased. Simultaneously, the test efficiency is improved, and the production cost is reduced.

The invention provides a universal calibration method for transmission path delay errors of a parallel ADC sampling system, and aims to provide a universal method capable of adapting to sampling frequency changes and correcting multichannel data input delay. According to the technical scheme, a clock and a signal are configured into multi-channel output through an AD chip integrated with M channels, and an AD is connected with an FPGA through a serial peripheral interface to form a high-speed variable sampling rate system. The AD performs multi-channel parallel sampling on high-speed signals to realize first-stage speed reduction, and the FPGA performs serial-parallel conversion by adopting serial-parallel conversion primitives or serial-parallel conversion IP cores to realize second-stagespeed reduction. After the FPGA configures an AD to send a test sequence, a calibration instruction and a state machine are started, a time delay parameter calibration algorithm is operated, time delay parameters are dynamically placed into an FPGA input time delay control primitive, all data lines in channels and among the channels are aligned, the AD exits from the test sequence to output actual signals, and system input time delay calibration is completed.

The invention discloses a projection picture automatic calibration method. The projection picture automatic calibration method comprises the steps of projecting a prestored calibration picture to a preset projection object so as to form a projection picture when a calibration instruction is detected; capturing the projection picture on the preset projection object in a preset capture region; calculating to acquire coordinate information of the projection picture in the preset capture region; comparing the capture region with the prestored calibration picture, and acquiring proportion information of the capture region and the prestored calibration picture; calculating to acquire the angle of each vertex of the projection picture according to the proportion information and the coordinate information; and adjusting projection parameters of the projection picture according to the angle of each vertex of the projection picture. The invention further discloses a projection picture automatic calibration device. According to the invention, calibration for deformation of the projection picture is realized automatically, and the efficiency of calibration for the projection picture is improved.

The embodiment of the invention discloses a method and device for adjusting broadcasting amount, an unmanned aerial vehicle and a storage medium, which are applied to the unmanned aerial vehicle for broadcasting by driving a material taking wheel through a motor; the method comprises the following steps: receiving calibration instructions including a calibration rotation speed and calibration duration; controlling a motor to operate at the calibration rotation speed within the calibration duration so as to discharge materials to be broadcast; acquiring flight parameters and the actual discharge amount of materials to be broadcast discharged by a material taking wheel in the calibration duration; determining an adjustment coefficient of the flight speed and the rotation speed of the motor according to the flight parameters and the actual discharge quantity; adjusting the rotation speed of the motor according to the adjustment coefficient so as to adjust the broadcasting amount. In the calibration stage, different materials to be broadcast are controlled to be discharged by controlling the motor to operate the calibration duration at the calibration rotation speed, so that the flightspeed and the motor rotation speed adjustment coefficient can be obtained, the rotation speed of the motor driving the material taking wheel under different flight speeds of different broadcast materials is achieved, and accurate variable broadcast is achieved.

The invention relates to a rocking bar calibration method and device. The method comprises the following steps that: when a rocking bar calibration instruction is received, collecting a current first electric signal; judging whether the first electric signal is matched with a preset reference electric signal on a preset position of the rocking bar or not; and when the first electric signal is matched with the preset reference electric signal, determining a current position corresponding to the first electric signal as a preset position, wherein the preset position comprises at least one of the original point position of the rocking bar and the extreme position of the rocking bar. By use of the technical scheme, when a rocking bar calibration instruction is received and the collected current first electric signal is matched with the preset reference electric signal, the current position corresponding to the first electric signal can be determined as a true preset position under a current situation, so that the current preset position of the rocking bar can be accurately confirmed through the current first electric signal, and a situation that a control signal generated by the rocking bar is inaccurate due to the change of the preset position since environment factors and use duration are changed is avoided.