14 results about "Bandwidth extension" patented technology

Techniques for speech bandwidth extension and denoising. The techniques integrate data-driven artificial intelligence (AI) models specifically trained to be robust to myriad of distortions. The system is capable of producing high-fidelity wideband speech from real-life narrowband inputs. The output is consistently preferred by listeners over the narrowband input, as well as over denoising alone.

A method for extending a frequency band of an audio signal, which is performed by a decoding device and includes: receiving a bit stream sent by an encoding device, and obtaining a decoded audio frequency domain signal by decoding the bit stream; and in response to a highest frequency point with a bit allocation in the audio frequency domain signal being lower than a starting frequency point of a preset bandwidth extension frequency band, or a frequency band with a bit allocation in the audio frequency domain signal being smaller than a preset bandwidth extension starting frequency band, predicting a frequency spectrum signal between the highest frequency point with the bit allocation and a highest frequency point of the preset bandwidth extension frequency band based on a frequency spectrum signal within a predetermined frequency band range or a predetermined frequency point range in the audio frequency domain signal.

The technical scheme of the invention discloses a bandwidth expansion circuit applied to a high-speed interface equalizer. Aiming at the problem of insufficient compensation capability of the bandwidth expansion technology under the condition of relatively large input parasitic capacitance introduced by a load, an inductor is cascaded between a CTLE module and a VGA module, and the resonance effect of the series peaking inductor and the parasitic capacitance is utilized, so that the bandwidth expansion is realized; aiming at the bandwidth expansion requirement under the condition of high speed and large load, a series peaking inductor is combined with a parallel peaking inductor in the prior art, and the bandwidth of the CTLE module is pushed to higher frequency; in order to solve the problem that a passive inductor occupies a large area, an inverter composed of MOS tubes is designed to achieve an active inductor, the chip area is effectively reduced, and the system design requirement is met.

This application relates to the field of servo control technology, and in particular to a method, apparatus, and device for extending the bandwidth of a servo system. The method includes: acquiring speed data, current data, and panel gain data of the servo system; identifying speed loop parameters of the servo system based on the speed data, current data, and panel gain data; identifying low-frequency rigid body model parameters based on the speed data; identifying high-frequency flexible model parameters based on the speed data; constructing a speed loop controlled object model based on the low-frequency rigid body model parameters and the high-frequency flexible model parameters; and extending the bandwidth of the servo system based on the speed loop controlled object model and the speed loop parameters. This solves the problems of limited bandwidth extension and low control accuracy in related technologies for servo closed-loop systems.

The method for testing the frequency response parameters of a photodetector first involves constructing a testing device, which includes a dual-carrier light source module, a Mach-Zehnder modulator, the photodetector under test (DUT), a microwave signal source, a data acquisition module, and a control and data processing module. The dual-carrier light source module outputs a dual-carrier optical signal, which is fed into the Mach-Zehnder modulator biased at a specific operating point. The modulator is modulated by the output signal from the microwave signal source connected to the RF drive electrode. The optical signal output from the modulator then enters the DUT to generate a photocurrent signal. The control and data processing module keeps the microwave signal source in an on state. Under this condition, the spectrum analysis module obtains the amplitude information of a specific frequency signal in the output optical signal of the DUT. Analysis and calculation yield the frequency response of the DUT. To further extend the test frequency range, the control and data processing module controls the microwave signal source to be in both on and off states. The spectrum analysis module obtains the amplitude information of a specific frequency signal in the output optical signal of the DUT. Analysis and calculation yield the modulation coefficient of the Mach-Zehnder modulator. Subtracting the modulation response from the amplitude information of the specific frequency signal allows for bandwidth extension testing of the DUT's frequency response.

The present disclosure relates to an anti-aging bandwidth extension device. A circuit for inductive peaking can include a driver, an inverter, a resistor between an output node of the driver and an input node of the inverter, and a switch. For example, a first node of the resistor can be connected to the output node of the driver, and a second node of the resistor can be connected to the input node of the inverter. The switch can be connected between an output node of the inverter and the first node of the resistor. An input node of the driver can correspond to an input node of the circuit, and the output node of the driver can correspond to an output node of the circuit.

This invention relates to the field of front-end active circuit technology, specifically to a three-channel symmetrical broadband high-back-off Doherty power amplifier, comprising a first microstrip line, three equally divided power dividers, a phase compensation network, three input matching networks, a carrier power amplifier, a first peak power amplifier, a second peak power amplifier, a load modulation network, a post-matching network, a DC blocking capacitor, and a second microstrip line. The post-matching network of this invention generates a complex-valued load that varies with frequency at the junction point, compensating for the influence of the peak power amplifier at different offset frequencies, thereby maintaining a small change in the impedance value at the output of the carrier power amplifier and realizing its bandwidth extension function. This solves the problem of high difficulty in implementing broadband design in existing power amplifiers.

An ear-wearable electronic device is operable to apply a low-pass filter to the digitized voice signal to remove a high-frequency component and obtain a low-frequency component. Speech enhancement is applied to the low-frequency component. Blind bandwidth extension is applied to the enhanced low-frequency component to recover or synthesize an estimate of at least part of the high frequency component. An enhanced speech signal is output that is a combination of the enhanced low-frequency component and the bandwidth-extended high frequency component.

A coding scheme includes determining a modulation scheme, where the modulation scheme is related to a threshold of a first parameter, and the first parameter includes at least one of: a modulation order, bandwidth extension, scheduled bandwidth, spectral efficiency, a modulation and coding scheme (MCS) index, and a code rate; and sending first indication information to a terminal device, where the first indication information indicates the modulation scheme.

The application discloses a bandwidth-extended micro-mechanical gyroscope open-loop detection method and an open-loop detection system, and the method comprises the following steps: calculating the Coriolis force of a micro-mechanical gyroscope detection mode and a detection mode output signal according to an input angular velocity, and inputting the detection mode output signal to a low-pass filter after modulation; output signals of the low-pass filter are sequentially transmitted to a notch filter for offsetting a mode frequency difference resonance peak and a second-order oscillation link for suppressing high-frequency noise, and the bandwidth-extended open-loop detection is completed; the notch filter and the second-order oscillation link are connected in series and then connected to the low-pass filter, so that the bandwidth extension of the micro-mechanical gyroscope open-loop detection is realized, the angular velocity open-loop detection bandwidth is no longer limited by the working mode frequency difference of the micro-mechanical gyroscope, the angular velocity open-loop detection bandwidth is improved, and meanwhile, the phase characteristic of the angular velocity open-loop detection is ensured.

This invention provides an antenna radiating element and an antenna device. The antenna radiating element includes: a half-wave dipole, comprising a balun and a dipole arm electrically connected to the balun; and a bandwidth extension section, comprising a frequency selection circuit and an extension radiating arm, wherein the frequency selection circuit connects the dipole arm and the extension radiating arm. The half-wave dipole has a starting frequency of a first frequency and a stopping frequency of a second frequency. The frequency selection circuit is configured to operate in a stopband above the first frequency and in a passband below the first frequency. The antenna radiating element and antenna device provided by this invention optimize the operating bandwidth of the half-wave dipole through the frequency selection circuit, thereby increasing the relative bandwidth of the ultra-wideband radiating element at different frequencies and optimizing its performance indicators.

The present application relates to the technical field of communications, and provides a signal generation method and an apparatus. In the method, a communication apparatus (such as an access network node or a terminal) acquires a first sequence and a second sequence, performs Fourier transform on the first sequence to obtain a first frequency domain signal, and determines a second frequency domain signal on the basis of the first frequency domain signal and the second sequence. The length of the first sequence and the second sequence is N, N being an integer greater than 1. The second sequence is obtained on the basis of a Zadoff-Chu sequence, and the second frequency domain signal is used for generating a signal to be sent. The method can implement Chirp modulation of the first sequence, and implement bandwidth extension, i.e., a broadband frequency domain signal can be obtained using a small Fourier transform size, thereby improving resource utilization efficiency.

This invention belongs to the field of microwave vacuum electronic devices, specifically providing a trapezoidal subwavelength aperture high-frequency structure for an extended interaction klystron, used to improve the power and gain of the extended interaction klystron and expand its bandwidth. This invention creatively proposes an isosceles trapezoidal subwavelength aperture with a base length proportional to the width of the resonant cavity, thereby designing the input cavity, intermediate cavity, and output cavity. This increases the beam-wave interaction area and characteristic impedance of the intermediate cavity, improving the interaction efficiency while maintaining a low quality factor and avoiding parasitic oscillations. It also increases the characteristic impedance of the input and output cavities, enhancing beam-wave interaction and reducing the input reflection coefficient S. 11 With a relatively large value and a -5dB bandwidth greater than 1GHz, the power feed and bandwidth extension capabilities are further enhanced. Compared with the traditional trapezoidal structure, the extended interaction klystron of this invention has significant advantages in terms of high power, high gain, and wide bandwidth.

A multi-channel Doherty power amplifier and its bandwidth extension method are disclosed. The power amplifier includes a power divider, an input multiplexer, a main amplification branch, an auxiliary amplification branch, a power combiner, and an impedance matching unit. By constructing multiple frequency complementary branches and introducing an impedance compression network, the power amplifier can continuously cover a wider frequency band, thereby extending the bandwidth. This solves the problem of the requirement for broadband operating mode or multi-frequency reconfiguration mode of energy transmission array in microwave energy transmission systems. The main branch covers the required entire operating bandwidth, and (n-1) auxiliary branches form a frequency complementary relationship to jointly cover the entire operating bandwidth. Each branch uses the impedance compression network to extend its own bandwidth. The main branch and each auxiliary branch completely and continuously cover the operating bandwidth, thereby significantly extending the bandwidth of the Doherty power amplifier.