22results about "Limiting amplitude" patented technology

The invention discloses a P-band high-power filtering and amplitude limiting assembly, which belongs to the technical field of microwaves and comprises a filter, an amplitude limiter, a polarizer, a coupler and a metal cavity. The amplitude limiter is installed on the bottom layer of the metal cavity, the filter and the polarizer are installed on the top layer of the metal cavity, the coupler is installed on the side wall of the metal cavity, the filter, the low-pass filter and the polarizer are connected in a wall-penetrating welding mode through a 50-ohm metal connecting rod, and the polarizer is fixed to the metal cavity through a medium supporting column. The whole assembly belongs to an upper-lower layer structure. According to the assembly, the transmission path between devices is shortened, the emission loss of the assembly is reduced, the size of the filtering and amplitude limiting assembly is greatly reduced under the condition that composite multiple functions are met, and the purposes of high power and high integration are achieved.

A data slicer may include an input transistor configured to generate an internal output voltage based on an input voltage at an input node. An output node may be configured to output an output voltage based on the internal output voltage, and a feedback transistor may be configured to adjust the internal output voltage based on a correction voltage corresponding to output of the output node in a previous cycle.

The invention provides a special amplitude limiting circuit for a PLC (Programmable Logic Controller), relates to the technical field of power line carrier communication, and aims to solve the technical problems that an AGC (Automatic Gain Control) circuit in an existing PLC communication system is limited in adjusting range, signal identification fails and the circuit burning risk is high. The system comprises a micro-control unit MCU, a current-limiting resistor, an optocoupler, a PLC signal coupling circuit and a PLC chip, and compared with a conventional PLC communication PLC chip signal path and process, a PLC amplitude limiting circuit is additionally arranged in front of the receiving ends RX + and RX-of the PLC chip; through the function that receiving ends RX + and RX-of a PLC chip identify the signal to noise ratio, the PLC chip communicates with a micro-control unit MCU through serial ports TX and RX, and through two modes of controlling and accessing different resistance values of series resistors to limit current and controlling and accessing different resistance values of divider resistors, the amplitude of a PLC signal is limited, so that the size of the PLC signal is changed, and the signal to noise ratio of the PLC signal is adjusted.

The invention relates to the technical field of anti-interference receiving, and discloses a tunable high-temperature superconducting amplitude limiter based on voltage regulation. Comprising a radio-frequency signal input end P1, a first impedance conversion node assembly, a superconducting amplitude limiting node L4, a direct-current bias regulation and control circuit for introducing bias current to the superconducting amplitude limiting node L4, a second impedance conversion node assembly and a radio-frequency signal output end P2 which are electrically connected in sequence, the first impedance conversion node assembly and the second impedance conversion node assembly are the same in structure, and each of the first impedance conversion node assembly and the second impedance conversion node assembly comprises a superconducting microstrip transmission line, a blocking capacitor and an impedance conversion node, on the premise that geometric structure parameters of the high-temperature superconducting amplitude limiting section are not changed, the working current density of the high-temperature superconducting amplitude limiting section can be changed within the range close to or away from the critical current density of the superconducting material by adjusting the magnitude of the bias current, and therefore tuning of the amplitude limiting threshold value and the power bearing capacity of the amplitude limiter is achieved.

The present invention provides a digital audio processing device that can generate harmonic signals ideal for improving sound quality, even when the digital audio signal contains waveforms with multiple consecutive samples of the same value as a maximum or minimum sample. [Solution] The maximum / minimum sample detection unit 11 detects the maximum and minimum samples in a series of samples that constitute a digital audio signal. The maximum / minimum sample correction unit 12, when there are consecutive samples with the same value as the maximum or minimum sample, assigns a maximum sample tag or a minimum sample tag to samples that are different from the maximum or minimum sample among the consecutive samples. If no consecutive samples exist, the maximum / minimum sample correction unit 12 assigns a maximum sample tag to the maximum sample and a minimum sample tag to the minimum sample.

This application relates to methods and apparatus for clipping prevention. A driver apparatus for driving a load with an output signal has a switching driver with a switch network and a modulator configured to control the switch network to switch output nodes between different switching voltages with a controlled duty-cycle. A quantizer controller receives a quantizer input signal based on an input signal and a feedback signal and controls the duty-cycle of the switch network. A clipping prevention controller is configured to control a gain applied to the input signal so as to provide limiting of the input signal to avoid clipping, wherein the clipping prevention controller is configured to dynamically control at least one limiting threshold used to determine when to apply limiting of the input signal based on an indication of said quantizer input signal.

The application discloses an output limiting device applied to a switching power supply, comprising an error amplifier, an output resistor, an amplifier and a current biasing module; the input end of the error amplifier is connected with the switching power supply, a reference voltage and the current biasing module, and the reference voltage is used for limiting the output voltage of the switching power supply within a preset range; the output end of the error amplifier is connected with the first end of the output resistor; the input end of the amplifier is connected with the reference voltage and the current biasing module; the output end of the amplifier is connected with the second end of the output resistor and the input end of the amplifier; and the current biasing module is connected with the reference voltage. The output limiting voltage of the application is related to the reference voltage and the output resistor. Since the resistors have good matching on the same chip and the accuracy of the reference voltage is high, the limiting voltage is less affected by process fluctuation, more accurate limiting control can be realized, and the influence of the size deviation of the traditional MOS tube on the limiting voltage is avoided.

A maximum / minimum sample detection unit (11) detects a maximum sample and a minimum sample in a series of samples constituting a digital audio signal. When there are consecutive samples in which samples having the same value as the maximum sample or the minimum sample are consecutive, a maximum / minimum sample correction unit (12) assigns a maximum sample tag or a minimum sample tag to samples differing from the maximum sample or the minimum sample rather than to the consecutive samples. If there are no consecutive samples, the maximum / minimum sample correction unit (12) assigns a maximum sample tag to the maximum sample and assigns a minimum sample tag to the minimum sample.

The utility model relates to the technical field of microwave frequency, in particular to an X-waveband amplitude-limiting low-noise amplifier device. Comprising a high-frequency input port, an amplitude limiter, a first switch and a second switch which are connected in sequence, and the first switch is used for dividing signals into a first path and a second path; the first path comprises a step attenuator and an amplifier I which are connected in sequence; the second path comprises an amplifier II; and the switch II is used for selecting an output signal of the first path or the second path and transmitting the output signal to the output port through the filter, the final amplifier and the power divider. The problems of high isolation, low noise coefficient and low cost compatibility in the single-channel topology are solved.

The present application relates to a kind of wideband log detector.It includes the limiting amplifier link for the limiting amplification of signal to be detected, the limiting amplification gain includes first limiting amplification gain or second limiting amplification gain, the value of first limiting amplification gain is greater than the value of second limiting amplification gain, wherein, when the limiting amplification gain of limiting amplifier link is first limiting amplification gain, access the limiting amplifier of first stage number, and each limiting amplifier provides single-stage first amplification gain;When the limiting amplification gain of limiting amplifier link is second limiting amplification gain, access the limiting amplifier of second stage number, and each limiting amplifier provides single-stage second amplification gain;First stage number is less than second stage number, and single-stage first amplification gain is greater than single-stage second amplification gain.The present application can effectively stabilize the translation of the RSSI output characteristic curve of log detector, improve the output characteristic and process robustness of log detector.

A method for performing loudness normalization, the method being performed by an audio signal processing device, includes the steps of receiving an audio signal; receiving information about an integrated loudness of the audio signal; receiving information about a target loudness of the audio signal; correcting the integrated loudness based on one or more processing steps to obtain a corrected integrated loudness; and normalizing the audio signal based on the corrected integrated loudness and the target loudness to obtain a normalized audio signal.

A controller regulates the voltage delivered to the load and current drawn from the battery in an audio system depending on ripple in the battery voltage which is input to the controller to allocate power for audio playback. Regulation maximizes available headroom while avoiding audio clipping. The effect of internal battery and external parasitic resistance (ESR) on ripple is compensated by an iterative process. ESR is rapidly increased whenever the minimum of the battery voltage input to the controller falls below a clipping threshold and slowly decreased whenever such voltage exceeds such threshold and the audio is under compression. A limiter allocates power to utilize more of the available audio headroom. A de-emphasis filter in each audio signal path compensates for capacitive ripple in the battery voltage input to the controller. As the frequency of the audio input changes, the filter(s) allow frequency-dependent power / current regulation to fill the full audio range without distortion.

The application discloses a kind of end-stage voltage tracking anti-clipping circuits for audio power amplifier, it is related to power amplifier technical field, the circuit includes: voltage dividing circuit: for receiving from target power amplifier device and end-stage voltage and generating combination voltage signal;Audio attenuation module: for receiving audio input signal and end-stage voltage, whether to receive start signal discrimination whether to perform amplitude modulation to audio input signal after completing power output;Start discrimination module: for receiving combination voltage signal and first output signal, combination voltage signal is compared with first output signal to generate start signal.The application sets the end-stage voltage of the collected target power amplifier as a dynamic amplitude limiting threshold, which can quickly suppress excessively high signals to a safe range when the power supply momentarily drops, thereby avoiding the degradation of listening experience caused by waveform truncation of the power amplifier signal and avoiding the safety hazards caused by amplitude clipping.

The embodiment of the utility model provides a broadband gain-controllable limiting amplifier circuit and an optical module. The broadband gain-controllable limiting amplifier circuit comprises a plurality of differential amplification modules which are connected in series and used for amplifying input signals step by step; the differential amplification module comprises a differential amplification circuit, a proportional current source and a current adjusting circuit, and the proportional current source is used for outputting a second current at an output end of the proportional current source according to a preset proportion and a first current input at an input end of the proportional current source to serve as a tail current of the differential amplification circuit; the current adjusting circuit comprises a plurality of parallel current sources for inputting current to the input end of the proportional current source, at least one of the parallel current sources is provided with a corresponding switch component, and the switch component is used for switching on or switching off the current input to the input end of the proportional current source by the corresponding current source so as to adjust the first current.

The application discloses a suspended strip line triplexer and limiter integrated device, and relates to the microwave and radio frequency technical field.The device comprises a suspended strip line triplexer composed of a metal cavity and a suspended dielectric substrate, is provided with one input port and three output ports corresponding to different frequency bands, and is provided with a step impedance resonator group between each port, is connected through parallel plate capacitance, and is further connected through a high impedance thin line equivalent series inductance.The step impedance resonator is used for generating a transmission zero point outside the frequency band.The device is provided with PIN diode limiters at the three output ports, the metal cavity is composed of upper and lower metal cover plates, metal patches on the suspended strip line are connected with the upper and lower metal cover plates through vias, radio frequency grounding is realized, and a limiter PIN diode grounding position is reserved.The application has the advantages of compact structure, multi-frequency band signal separation, interference suppression, interference signal amplitude limitation, improved system reliability and stability, and function expansion.

To provide an amplifier system that uses digital-analog converters to provide a regulated output over a large dynamic range.SOLUTION: A method of feedback control of an amplifier system includes: driving multiple amplifier circuits using at least one digital-analog converter (DAC) circuit to set a system output of the amplifier system; operating the at least one DAC circuit using a first set of DAC codes to set the system output to a steady state target output; detecting a high glitch transition of the first set of DAC codes that is greater than a specified threshold transition; and changing to operating the at least one DAC circuit using a second set of DAC codes to set the system output to substantially the same steady state target output. Operating the at least one DAC circuit using the second set of DAC codes reduces glitch energy at the output of the at least one DAC circuit.SELECTED DRAWING: Figure 4

An electrostatic discharge trap device for protecting a water-resistant microphone from electrostatic discharge may include a conductive material positioned between a microphone port and a microphone venting stack-up to prevent liquid entry into the microphone, wherein the electrostatic discharge trap device is configured to receive an electric spark from the microphone port and conduct the electric spark away from the microphone venting stack-up to a conductive layer.

The invention belongs to the technical field of electromagnetic protection, and relates to a surface acoustic wave filtering amplitude limiting device, which comprises a piezoelectric crystal and more than one group of filtering amplitude limiting units, the filtering amplitude limiting unit comprises an interdigital transducer, an energy self-adaptive conversion region and an energy absorption region; the interdigital transducer is arranged at the middle position of the filtering amplitude limiting unit so as to convert the electromagnetic wave signal into a surface acoustic wave and transmit the surface acoustic wave into the energy self-adaptive conversion area; the energy adaptive transformation regions are arranged on two sides of the interdigital transducer, comprise columnar chambers distributed in an array and non-Newtonian fluids arranged in the columnar chambers, and are used for performing nonlinear response on the amplitude of the surface acoustic wave, so that frequency selective filtering is realized in a low-power signal input state, and surface acoustic wave transmission is realized in a high-power signal input state; and the energy absorption regions are arranged on the two sides of the energy self-adaptive transformation region to absorb the transmitted surface acoustic waves so as to realize amplitude limiting protection. According to the invention, filtering and amplitude limiting can be realized simultaneously.

Circuit, method for audio signal processing with excursion estimation compensation, and non-transitory storage medium are provided. The circuit comprises a delay circuit, compensation filter, excursion estimator, peak detector, gain determination circuit, and gain adjustment circuit. The delay circuit is for delaying a digital audio signal to output a delayed digital audio signal. The compensation filter is for generating a compensated digital audio signal according to the digital audio signal for excursion estimation compensation for a speaker type. The excursion estimator is for determining an estimated excursion signal for the speaker type according to the compensated digital audio signal. The gain determination circuit is for generating a gain setting signal according to the estimated excursion signal and a threshold value. The gain adjustment circuit is for generating an adjusted digital audio signal according to the gain setting signal and delayed digital audio signal.

This utility model discloses a 1-40GHz downconverter component, comprising a 1-6GHz input channel, a 6-18GHz input channel, and a 33-40GHz input channel; a 3-18GHz output channel and a 1.75-1.85GHz output channel; the 1-6GHz input channel is composed of a 1-6GHz filter, a first limiter, a first amplifier, and a first power divider connected in series; the 33-40GHz input channel is composed of a 33-40GHz filter, a second limiter, a fourth amplifier, and a second power divider connected in series; the 6-18GHz input channel is composed of a 6-18GHz filter, a third limiter, a seventh amplifier, and a third power divider connected in series. This utility model has the advantages of wide bandwidth, high adaptability, high precision, and strong anti-interference, and also has dual-band coverage capability of 1-18GHz and 33-40GHz, which can seamlessly adapt to complex signals in multiple fields such as communication and radar, greatly improving the overall performance of electronic systems.