77results about "Limiting amplitude" patented technology

Disclosed in the present invention are a power amplifier module for implementing average power protection, an electronic device, and a method. The power amplifier module comprises: a controller, configured to provide logic control and bias voltage for a radio frequency power amplifier; the radio frequency power amplifier, configured to amplify the power of a radio frequency signal and then output the amplified radio frequency signal to a filter; and a filter for frequency bands, configured to filter the amplified radio frequency signal to obtain a radio frequency signal of a required specific frequency band. When the detected power of the radio frequency power amplifier is greater than or equal to a first power threshold, and the time during which the detected power is greater than or equal to the first power threshold reaches a first time threshold, the power amplifier module enters an average power protection operating mode, and the controller adjusts the gain of a power amplification unit, so as to protect the filter in the power amplifier module from being burnt out.

The invention provides a segmented adaptive gain-based short-wave band amplitude and phase control device and method, and relates to the field of short-wave intelligent control. The method comprises the following steps: performing coupling detection processing on N paths of input short-wave signals to obtain coupled short-wave signals and power values of the coupled short-wave signals; based on the coupled short-wave signal and the power value of the coupled short-wave signal, calculating adjustment parameters through a preset adaptive segmented multi-target differential evolution algorithm, wherein the adjustment parameters comprise a frequency correction parameter, a phase adjustment parameter and an amplitude control voltage; adjusting the coupled short-wave signal based on the adjustment parameter to obtain a target short-wave signal; and detecting whether the target short wave signal meets a preset output condition, and if the target short wave signal meets the preset output condition, coupling the target short wave signal to output a radio frequency output signal. Through the scheme, the communication quality is improved.

The invention discloses a final-stage voltage tracking anti-clipping circuit for an audio power amplifier, and relates to the technical field of power amplifiers, and the circuit comprises a voltage division circuit which is used for receiving final-stage voltage from target power amplifier equipment and generating a combined voltage signal; the audio attenuation module is used for receiving an audio input signal and a final-stage voltage, and judging whether amplitude limiting modulation is carried out on the audio input signal or not to complete power amplifier output by judging whether a starting signal is received or not; and the starting judgment module is used for receiving the combined voltage signal and the first output signal, and comparing the combined voltage signal with the first output signal to generate a starting signal. According to the invention, the collected final-stage voltage of the target power amplifier is set as the dynamic amplitude limiting threshold, so that an over-high signal can be effectively suppressed to a safe range quickly when the power supply drops instantaneously, and the effects of avoiding hearing deterioration caused by power amplifier signal waveform truncation and avoiding potential safety hazards caused by amplitude limiting and topping to the loudspeaker are achieved.

The invention belongs to the technical field of integrated circuit signal processing, and discloses a temperature compensation circuit for a logarithmic detector and the logarithmic detector thereof, and the temperature compensation circuit for the logarithmic detector comprises a first temperature compensation module, a second temperature compensation module and a third temperature compensation module. The first temperature compensation module is used for performing temperature compensation on the current summation module, the second temperature compensation module is used for performing temperature compensation on bias voltage and current of the limiting amplifier module, and the third temperature compensation module is used for performing temperature compensation on bias voltage and current of the rectifier module. The logarithmic detector temperature compensation circuit is suitable for performing temperature compensation on the current summation module, the limiting amplifier module and the rectifier module of the logarithmic detector, and the output precision and consistency of the logarithmic detector are improved.

The signal amplitude limiting circuit comprises a first voltage division circuit, a signal amplification circuit and a second voltage division circuit, the second voltage division circuit comprises a first resistor R1 and a third triode PQ3, the base electrode of the third triode PQ3 is electrically connected with the output end of the signal amplification circuit, the emitter electrode of the third triode PQ3 is grounded, and the first resistor R1 is electrically connected with the output end of the signal amplification circuit. The collector electrode of the third triode PQ3 is electrically connected with the second end of the first resistor R1, and the first end of the first resistor R1 is electrically connected with the signal output end. By arranging a first voltage division circuit, a signal amplification circuit and a second voltage division circuit, when an input signal exceeds a normal range, the input signal can drive a third triode PQ3 of the second voltage division circuit to enter an amplification state after passing through the first voltage division circuit and being amplified, and at the moment, an output signal is influenced by voltage division of a first resistor R1 and the third triode PQ3; and the output signal is not increased along with the increase of the input signal, so that distortion or overhigh power is avoided.

A headset communication system with improved functionality. The headset communication system may include hear-through limiter functionality. The headset communication system may include failsafe functionality. The headset communication system may include multichannel, mixing, passive push-to-talk functionality. The headset communication system may include near field magnetic induction functionality.

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.

A clipping detector circuit (12) is configured to detect clipping of a pulse-width modulated signal (PWMout ) and comprises a timer circuit (120) configured to monitor edges of the pulse-width modulated signal (PWMout ) and to monitor a time period elapsing since a last occurrence of an edge in the pulse-width modulated signal (PWMout ), assert a first signal (ClipDet) when said time period elapses, and de-assert the first signal (ClipDet) and reset said time period as a result of an edge occurring in the pulse-width modulated signal (PWMout ); and a counter circuit (122) configured to monitor the pulse-width modulated signal (PWMout ) and the first signal (ClipDet), determine the number of pulses in said pulse-width modulated signal (PWMout ) since the last de-assertion of the first signal (ClipDet), and assert a second signal (ClipOut) when the number of pulses in said pulse-width modulated signal (PWMout ) since the last de-assertion of the first signal (ClipDet) reaches a certain number m of pulses. The clipping detector circuit (12) is configured (124) for generating at output a clipping detection signal ( ClipDet' ) indicative of whether the pulse-width modulated signal ( PWMout ) is clipped or not as a function of the first signal ( ClipDet ) and the second signal ( ClipOut ).

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 utility model provides an absorption type amplitude limiter, which relates to the technical field of absorption type amplitude limiters and comprises a mounting mechanism, an amplitude limiter main body is mounted at the top end of the mounting mechanism, the mounting mechanism comprises a base, a bottom plate is arranged at the top end of the base, an insertion groove is formed in the front surface of the base, an insertion rod is slidably connected in the insertion groove, and the insertion rod is fixedly connected with the base. The top end of the inserting rod is fixed to the front face of the bottom plate, built-in grooves are formed in the positions, close to the front face and the right side, of the interior of the base, fixing assemblies are installed in the built-in grooves, a rotary knob is rotated to be disengaged from a sliding rod, the sliding rod is pushed out of a circular groove through a spring, and fixing of the inserting rod is relieved; and finally, the amplitude limiter main body is pushed forwards, and the amplitude limiter main body, the bottom plate and the insertion rod are taken out together for maintenance, so that compared with a traditional fixing mode, the operation convenience is greatly improved, and the maintenance efficiency is effectively improved.

The present invention is applicable to the field of microwave communication technology, and provides a microwave limiter and a transceiver based on feedback. The limiter comprises: a bidirectional coupler, a first forward detection module, a second forward detection module, a first choke inductor, a second choke inductor, a PIN diode, a first capacitor, an antenna end and a power transmitting end; the bidirectional coupler, the first main branch end is connected to the antenna end, the second main branch end is respectively connected to the first end of the first choke inductor, the positive electrode of the PIN diode and the power transmitting end, the first coupling end is connected to the input end of the first forward detection module, and the second coupling end is connected to the input end of the second forward detection module; the output end of the first forward detection module is connected to the second end of the first choke inductor; based on the characteristics of the bidirectional coupler, when a high-power signal is injected, the two detection modules are superimposed on the two ends of the PIN diode to perform unidirectional limiting, thereby realizing unidirectional protection of the high-power signal.

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 invention discloses a broadband amplitude limiting module with low reflection after overvoltage. The broadband amplitude limiting module comprises an impedance matching circuit, a high-input impedance amplifying circuit and a low-frequency gain control circuit, wherein the impedance matching circuit is used for performing 50 omega termination matching between an input signal and the high input impedance amplification circuit, and in the high input impedance amplification circuit, a low and medium frequency signal fed back by the low frequency gain control circuit and a high frequency signal coupled by the high frequency coupling capacitor are synthesized and then input to the differential operation amplification circuit; therefore, the problem of reflection caused by overvoltage in the circuit is solved, and the waveform quality of a signal path is ensured.

A driver apparatus 100c for driving a load (Fig.1, 102) with an output signal has a switching driver 101 with a switch network (Fig.1, 105) and a modulator 106 configured to control the switch network

Novel tools and techniques are provided for implementing a novel integrated programmable gain amplifier "PGA" and protection circuit. In various embodiments, a circuit is provided that includes a PGA, an analog-to-digital converter "ADC", and a protection circuit, all disposed on the same semiconductor chip. The PGA is configured to receive a wireless signal received from an antenna as input, and to output an amplified wireless signal at its output based on amplifying the wireless signal by a programmable gain amount. The protection circuit is configured to, in response to detecting a spike in gain at the output of the PGA that exceeds a threshold magnitude, control a reduction in the programmable gain amount to bring the resulting signal at the output of the PGA below the threshold magnitude. A normally open switch can also be added at the differential output of the PGA to further clamp the PGA output.

The present invention provides a power adaptive link allocation front-end receiving component, which mainly includes a front-end radio frequency circuit module, a detection signal operation circuit module, a radio frequency signal amplification circuit module, and an output power adjustment circuit module. A large-dynamic detector is used to detect the signal of the radio frequency receiving front-end to obtain a power-related level signal, and then the level signal is amplified by an operational amplifier. Then, according to the reference level set for radio frequency signals with different powers, the control level of the single-pole triple-throw switch in the subsequent circuit is automatically converted, and then different back-end signal processing links are selected to complete the signal processing function of the front-end receiving component, and finally the adaptive allocation feature of the receiving front-end is realized. The present invention can realize adaptive link allocation according to the magnitude of the radio frequency input power, and has the advantages of adaptive implementation, large dynamic range, high detection sensitivity, etc.

The invention provides an analog signal amplitude modulation circuit, a quartz tuning fork gyroscope circuit and a quartz tuning fork gyroscope, the amplitude modulation circuit comprises an operational amplifier U1, resistors R1, R2, R3 and R4 and a JFET, the JFET is represented by Q1, the number of the resistors R1 is two, an input signal of the amplitude modulation circuit is a high-frequency input signal ui, and an output signal of the amplitude modulation circuit is a high-frequency output signal uo; current generated by a high-frequency input signal ui enters the two branches at the same time, for the first branch, the high-frequency input signal ui flows to the ground after passing through one resistor R1 and parallel connection of R3 and Q1, and input voltage of the in-phase end of the operational amplifier is partial voltage of parallel connection of R3 and Q1; for the second branch, the current generated by the high-frequency input signal ui flows to the ground after passing through another resistor R1 and another resistor R2, and the current generated by the high-frequency input signal ui also flows into the inverting input end of the operational amplifier; in addition, the current generated when the high-frequency output signal uo passes through the R4 flows out of the inverting input end of the operational amplifier to form a negative feedback circuit. According to the invention, the higher harmonic interference of the gyro signal is reduced.

Provided in the present application are a level conversion circuit, an LIN bus control chip, and a micro-processing chip. The level conversion circuit comprises a signal input module, a signal output module, an amplitude limitation module, an inversion module and a delay module, wherein the signal input module is used for receiving an input signal of a communication bus; the signal output module is used for converting the input signal into a digital signal; the amplitude limitation module is connected to the signal input module, and is used for performing pull-down amplitude limitation on the input signal, so as to reduce the amplitude of the input signal; the inversion module is connected to the signal input module, and is used for controlling potential jump points of the input signal; and the delay module is connected to the signal input module, and is used for controlling widths between the potential jump points of the input signal, so as to realize a hysteresis effect. Therefore, attenuation and noise reduction are performed on the input signal by means of the amplitude limitation module, the inversion module and the delay module, so as to provide a stable voltage for an internal circuit of a chip.

A coaxial speaker protection method, a coaxial speaker protection system, a coaxial speaker protection device, and a coaxial speaker protector are provided. The coaxial speaker protection method includes modeling a temperature of a tweeter to obtain a tweeter voltage-temperature transfer function, modeling a temperature and an amplitude of a woofer to obtain a woofer voltage-amplitude-temperature transfer function, modeling a coaxial device having the tweeter and the woofer to obtain a thermal conduction function of the coaxial device, predicting a temperature at a next moment of the tweeter according to temperature information fed back by a current at a previous moment of the tweeter, etc. The tweeter and the woofer are protected through a feedforward manner, so that sound quality of a coaxial speaker is improved.

A driver apparatus 100a for driving a transducer (Fig.1, 102) has a switching driver 101 configured to switch at least one output node (Fig.1, 103a, 103b) between different switching voltages with a c

An audio system includes an amplifier, regulating circuitry, and a filter. The regulating circuitry generates an audio voltage threshold signal based on an estimated value of the supply voltage source of the system, the estimated ESR between the system voltage supply and amplifier voltage supply pin, and the measured output resistance of the system. From these measurements / estimates, an anti-clipping voltage limit signal is generated. Power-budget-based and current-budget-based voltage limit signals are also determined based on first and second functions of the estimated value of the voltage source, respectively. The minimum of these three voltage limit signals is selected as the audio voltage threshold signal. The measurements, estimates and calculations are performed on a periodic basis to continually update the audio voltage threshold signal and thus adaptively regulate the audio system. A de-emphasis filter in the audio signal path compensates for capacitive ripple of the voltage at the amplifier's voltage supply pin.

The embodiment of the invention provides a capacitive load overcurrent protection method and device, an intelligent power amplification device, electronic equipment and a storage medium, and the device comprises an amplitude limiting module which is used for carrying out the amplitude limiting of a first digital signal corresponding to a source signal, so as to obtain a second digital signal, the current applied to the D-type power amplifier by the first digital signal does not exceed a current peak value which can be supported by the D-type power amplifier; the anti-resonance filtering module is used for suppressing a part of frequency components in the second digital signal according to a preset center frequency to obtain a third digital signal, the center frequency is determined according to the frequency of a formant, and the formant is generated by mutual influence between the capacitive load and a preceding-stage element of the capacitive load; and the low-pass filtering module is used for filtering the third digital signal to obtain a fourth digital signal, and the fourth digital signal is provided for the capacitive load after being processed by the D-type power amplifier.

The present application provides a root mean square detector and an electronic device, wherein the root mean square detector comprises a squaring module, which outputs a first signal and a second signal; a plurality of current mirror units, each of which outputs a third signal and a fourth signal based on the first signal and the second signal; different third signals belong to different power ranges, and different fourth signals belong to different power ranges; a plurality of limiting amplifiers, each of which receives and performs subtraction and limiting processing on the third signal and the fourth signal, and outputs a fifth signal; a plurality of logarithmic amplifiers, each of which receives and performs logarithmic conversion on the fifth signal to generate a sixth signal, the output ends of all the logarithmic amplifiers are connected together, and all the sixth signals are superimposed to generate a target output signal, so that the design difficulty of the logarithmic amplifier can be reduced through segmented output, and the correctness of the result of the root mean square detector can be improved.