6 results about "Distortion ratio" patented technology

A transmission apparatus repeatedly inserts reference signal sequences into a transmission signal sequence at different timings, and converts the transmission signal sequence, into which the reference signal sequences are inserted, into an optical signal. The reception apparatus includes a detection unit, a waveform equalization unit, and a signal quality measurement unit. The detection unit receives the optical signal transmitted through an optical transmission line, and converts the received optical signal into a reception signal of an electrical signal. The waveform equalization unit performs waveform equalization on the reception signal converted into the electrical signal. The signal quality calculation unit extracts a reception signal sequence set in each section corresponding to the reference signal sequence from the received signal on which waveform equalization performed. For each combination of different sections, the signal quality calculation unit calculates a mean square error between the mean of the reception signal sequences set in the sections included in a combination and the reference signal sequence, and calculates a signal-to-noise ratio and a signal-to-distortion ratio of the reception signal using the mean square error calculated for each combination.

This invention relates to the field of cross-section borehole positioning technology, specifically disclosing a cross-section borehole positioning method based on central projection. By acquiring the 3D point cloud reconstruction mesh model of the cross-section and its projection pose parameters, the ray intersections and topological constraints are simultaneously calculated within a preset projection domain. An initial intersection set with occlusion determination and distortion ratio form a complete spatial mapping chain. An adaptive correction loop is constructed to relax the mesh protrusion occlusion and borehole spacing distortion in a linked manner, deriving the individualized optimal 3D borehole position distribution in reverse. This method breaks through the rigid limitations of traditional 2D templates, achieving accurate projection based on the true geometric shape of the cross-section, and providing a new high-fidelity pre-distortion guidance path for complex curved surface blasting operations.

This invention provides an analog joint coding modulation method, apparatus, and device based on amplitude probability shaping. By deeply coupling S-K mapping coding with multi-ring constellation modulation based on amplitude probability shaping, a modulation architecture combining geometric shaping and probability shaping is constructed. The radius of each ring in the constellation diagram is jointly determined by the amplitude scaling factor and the cumulative probability. A uniform phase offset is introduced between adjacent rings to optimize the geometric layout. Then, through joint iterative optimization of S-K mapping coding parameters and constellation amplitude and phase parameters, the signal distortion ratio is maximized. Thus, without increasing system complexity, a single modulation architecture can achieve collaborative adaptive optimization of coding and modulation, significantly improving the end-to-end transmission performance of the system.

This application provides a method for improving headphone audio experience and device battery life, comprising: acquiring high-frequency energy loss data from the headphone amplifier circuit, comparing it with a preset threshold, and determining whether material parameters need to be optimized; performing performance simulation on core circuit components based on the comparison result to determine the optimized material parameter configuration; acquiring circuit dynamic response data based on the material parameter configuration, analyzing fluctuation characteristics, and determining a response speed improvement scheme; adjusting high-frequency performance test signals based on the circuit stability enhancement model to determine a structural design correction path; acquiring audio purity sampling data through the structural design correction path, determining the distortion ratio, and obtaining sound quality improvement verification results; processing battery life simulation input based on the sound quality improvement verification results to determine a power consumption reduction configuration; and acquiring overall audio experience feedback through the power consumption reduction configuration, determining a balance index, and determining the final circuit deployment scheme.

To reduce the distortion rate of the input current. [Solution] The power conversion device includes a control unit. The control unit includes a feedforward unit 60 that derives the duty cycles of the upper arm switching element and the lower arm switching element by feedforward control of the input voltage and output voltage command value, a comparator 75 that outputs a PWM signal based on the duty cycle derived by the feedforward unit 60, a determination unit 58 that outputs a high-level or low-level output signal depending on whether the input voltage is positive or negative, and a logic circuit 80 that outputs control signals to control the upper arm switching element and the lower arm switching element based on the PWM signal and the output signal.

The application discloses a music rhythm-somatic rhythm synchronous control method and system based on mechanical resonance avoidance, and the method comprises the following steps: obtaining the inherent resonance frequency, quality factor and resonance bandwidth of an electromagnetic actuator-seat coupling system; collecting an audio signal and extracting a beat frequency, which is converted into a target driving frequency; calculating the frequency distance ratio between the target driving frequency and the inherent resonance frequency; when the frequency distance ratio is less than a resonance danger threshold, performing frequency offset on the target driving frequency and compensating the amplitude-frequency response attenuation at the offset frequency through an amplitude compensation formula. Through the cooperative strategy of frequency offset and amplitude compensation, the application can maintain the perceptual consistency of the rhythm intensity while avoiding mechanical resonance, reduce the resonance zone amplitude amplification multiple, and reduce the rhythm distortion rate.