6 results about "Internal feedback" patented technology

A Delta-sigma (delta-sigma) device comprises a transducer (2) and a delta-sigma modulator (3), where the transducer (2) comprises: a sensing stage (100) for detecting a property of an environment (106) and an interface stage (101), where the sensing stage (100) is configured to detect the property of the environment (106); and the delta-sigma modulator (3) comprises: an input stage, a feed-forward low-pass filtering stage (102), an analog-to-digital encoder (104), an unfiltered in-modulator feedback path and a low-pass filtered in-modulator feedback path; wherein the input stage is connected to the interface stage (101) and comprises two subtraction stages (113, 114) of the input stage for receiving an unfiltered in-modulator feedback signal (109) and a low-pass filtered in-modulator feedback signal (110) and subtracting the unfiltered in-modulator feedback signal (109) and the low-pass filtered in-modulator feedback signal (110) from the sum of the one or more input converted signals (108), to obtain a delta error signal (111); the analog-to-digital encoder (104) converts the filtered delta error signal into a digital output signal dout (t) (112); the feedback path in the unfiltered modulator converts the dout (t) (112) into a feedback signal (109) in the unfiltered modulator; the low-pass filtering modulator internal feedback path converts the dout (t) (112) into a low-pass filtering modulator internal feedback signal (110).

Example embodiments relate to machine learning based power amplifier digital predistortion. A device can utilize a power amplifier to amplify and transmit a signal. The signal can be received by an internal feedback receiver of the device. The device can further include a first machine learning model configured to emulate an external feedback receiver and generate an emulated feedback signal based on the internal feedback signal. The device can further include a second machine learning model configured to determine a digital predistortion parameter for the power amplifier based on the emulated feedback signal. Apparatuses, methods, and computer programs are disclosed.

This application relates to a real-time active sound synthesis method for electric vehicles based on vehicle dynamics parameters. The method involves real-time acquisition of motor speed, vehicle speed, throttle position, and torque; dynamic mapping and calculation of carrier frequency, modulation frequency, and modulation index; real-time generation of audio waveforms using a frequency modulation synthesis algorithm; and outputting external warning signals and internal feedback signals after spatial rendering. This method enables real-time changes in timbre based on driving operations, enhancing realism and safety, while reducing hardware costs.

This invention discloses a two-dimensional electrostatic scanning micromirror, comprising an outer frame, an inner frame, and a mirror surface. The outer frame is machined with an outer frame isolation groove, dividing it into an outer frame measurement section, an outer frame driving section, and two outer frame connecting sections. An external feedback comb group is located between the outer frame measurement section and the inner frame, and an external driving comb group is located between the outer frame driving section and the inner frame. The mirror surface is machined with a mirror surface isolation groove, dividing it into a mirror surface feedback section, a mirror surface driving section, and a central section. An internal feedback comb group and an internal driving comb group are machined between the mirror surface feedback section and the inner frame, respectively. By setting isolation grooves with different structures on the outer frame and the mirror surface, the outer frame and the mirror surface are separated into different functional parts. The inner and outer comb groups are respectively set as driving comb groups and feedback comb groups, enabling the measurement of the mirror surface deflection angle in two directions. Real-time feedback of the mirror surface deflection angle in different directions can be achieved, improving the accuracy of mirror surface deflection angle control.

The invention discloses an internal feedback hydrostatic bearing static performance calculation method considering internal backflow, which comprises the following steps of: determining and inputting various basic parameters of a bearing, including a structure parameter, a hydraulic oil parameter and an oil supply pressure parameter, and dividing grid nodes at the same time; and determining node positions corresponding to the working oil cavity, the feedback oil cavity and the oil return groove according to the structural parameters of the bearing and the node number of the corresponding grids. Calculating the oil film thickness of the corresponding position of each node by using the bearing structure parameters; working oil cavity pressure and feedback oil cavity pressure are calculated based on the flow conservation principle; working oil cavity pressure serves as initial oil film pressure of the oil sealing edge, and oil film pressure distribution of the oil sealing edge is calculated through a finite difference method discrete Reynolds equation. Static performance including bearing capacity and stiffness is calculated based on the pressure distribution of the entire oil film. According to the method, the calculation precision of the oil cavity pressure, the oil sealing edge pressure, the bearing capacity of the bearing and the oil film rigidity is improved, and the theoretical calculation and experimental performance deviation is reduced.

This invention discloses a pilot-operated internal feedback proportional cone valve and a hydraulic system. The pilot-operated internal feedback proportional cone valve includes a pilot valve, a main valve, and a mechanical feedback device. The pilot valve has a first valve chamber and includes a first valve stem movably disposed on the pilot valve along its axial direction. The main valve has a second valve chamber and a third valve chamber connected together, with the first valve chamber and the third valve chamber connected. The main valve also includes a second valve stem and a third valve stem. The second valve stem is movably disposed on the main valve along its axial direction, with a portion of the second valve stem located within the second valve chamber. The third valve stem is movably disposed on the main valve along its axial direction, with a portion of the third valve stem located within the third valve chamber. The first valve stem, the second valve stem, and the third valve stem are all drively connected to the mechanical feedback device. The pilot-operated internal feedback proportional cone valve of this invention has the advantages of high control accuracy.