Electronic preamplifier system

Methods and circuits to reduce pop noise in an audio device

Programmably configured switchmode audio amplifier

Amplifier system

Audio system having an improved efficiency and extended operation time

Low-power conversion between analog and digital signals using adjustable feedback filter

Power supplies

Audio amplifier circuit having inputs for three audio channels

Music reproducing device with first and second D/A converters for converting audio signals prior to inversion

Attenuating an input signal

Music reproducing device with active control ground mode

Amplifier with feedback circuit

Driver circuit for a power stage of a class-D amplifier

Reduced crosstalk class D audio amplifier matching output power based on channel gain

Music reproducing device

Microphone assembly and method of manufacturing a microphone assembly

COMMON-MODE COMPENSATION TECHNIQUE FOR PROGRAMMABLE GAIN AMPLIFIERS

Reduced crosstalk and matched output power audio amplifier using a triangle wave generator

Method for delivering a duty cycle limited signal to a speaker using a class D amplifier

Reduced crosstalk and matched output power class D audio amplifier with oppositely polarized triangle waves

Class-D audio amplifier

Audio entertainment system for a vehicle

Systems and methods for dynamic range enhancement using an open-loop modulator in parallel with a closed-loop modulator

High linearity structure for amplifier

Digital-to-analog converter

Differential class-D amplifier

Class D amplifier chip with duty ratio limiting functions and the device thereof

Offset calibration in a multiple membrane microphone

Average current-mode feedback control of multi-channel class-D audio amplifier

Semiconductor integrated circuit

Power decrease based on packet type

Power decrease based on packet type

Power increase based on packet type

Power decrease and increase based on packet type

Audio apparatus, and current control method

Digital signal processor and audio device

Power amplifier

Power amplifier without a transformer

Amplification systems and methods with one or more channels

Integrated audio amplification circuit with multi-functional external terminals

High efficiency class D amplifier with reduced generation of EMI

Amplifiers

Audio signal amplification device

Power decrease based on packet type

Audio circuit for suppressing DC shock noise

Audio amplifier circuit, audio output device using the same, and electronic device using the same

Implementation method and device of multi-bit modulation-based digital speaker system

Apparatus and methods for paralleling amplifiers

Power supply rejection rate through noise cancellation in an audio amplifier loop

Class-D amplifier

Hybrid Power Supply Unit For Audio Amplifier

Power amplifying device

Signal envelope processing

Apparatus and methods for generating a precise resistor

Quaternary/ternary modulation selecting circuit and associated method

Amplifier current consumption control

Pop and click noise reduction

Loudspeaker having electrically conductive membrane transducers

Method for amplifying a signal and amplifying device

Preamplifier and method

Multiphase pulse width modulator for class D audio amplifiers

Preamplifier circuit for a microelectromechanical capacitive acoustic transducer

Current analog audio amplifier

DC impedance detection circuit and method for speaker

5 GHz wireless stereo sound system

Current limiter

Method of generating a pulse width modulation (PWM) signal for an analog amplifier, and a related pulse width modulator

Integrated circuit charge pump with failure protection

Apparatus and method in apparatus

Class-D amplifiers and methods

Gate drive circuit

Audio delivery system having an improved efficiency and extended operation time between recharges or battery replacements

Power amplifiers coupled in series

ROTARY FLUX ACOUSTIC TRANSDUCER

Intrinsically safe audio power current circuit and device using same

Protection device

Speaker protection circuit with improved accuracy

Reconfigurable bias and supply drivers for radio frequency power amplifiers

Methods and circuits to reduce pop noise in an audio device

AUDIO AMPLIFYING DEVICE

Systems and methods for detection of load impedance of a transducer device coupled to an audio device

Electric amplifier circuit for amplifying an output signal of a microphone

Impedance converter circuit for condenser microphone

Microelectromechanical systems (MEMS) microphone array with dedicated amplifiers

Protection case for mobile communication device

Preamplifier for a microphone

Signal Amplifier

Advanced current limit function for audio amplifier

POWER MOSFETS WITH IMPROVED EFFICIENCY FOR MULTI-CHANNEL CLASS D AUDIO AMPLIFIERS AND PACKAGING THEREFOR

PWM modulation device and sound signal output apparatus

Class D power driver peripheral

Microphone With Electronic Noise Filter

Power increase based on packet type

Power stage with switched mode amplifier and linear amplifier

Group aware current-limited amplifier and system

Amplifier with adjustable ramp up/down gain for minimizing or eliminating pop noise

Systems and methods for dynamic range enhancement using an open-loop modulator in parallel with a closed-loop modulator

Crossover and amplifier based canalphone system

Electronic signal processor

Electronic device for generation of an audible alarm or music

Audio equipment

Headset amplification circuit with error voltage suppression

Amplifier

SWITCHING AMPLIFIER AND CONTROL METHOD THEREFOR

System and method for adjusting the sensitivity of a capacitive signal source

Power amplifying apparatus and power amplifying method

Amplifier apparatus with controlled negative output impedance

Frequency band compression with dynamic thresholds

Pulse-width modulation generator

System and method for low distortion capacitive signal source amplifier

AUDIO AMPLIFIER WITH RF INTERFERENCE SUPPRESSION FUNCTION

Circuit for reducing pop noise

Asymmetric H-bridge in a class D power amplifier

Cascode power amplifier with voltage limiter

ENERGY-EFFICIENT PERSONAL AUDIO DEVICE OUTPUT STAGE WITH SIGNAL POLARITY-DEPENDENT POWER SUPPLY UPDATE RATE

Switching circuit

Class D switching amplifier and method of controlling a loudspeaker

Reference amplifier coupled to a voltage divider circuit to provide feedback for an amplifier

Power amplifier

Method and apparatus for Class AB audio amplifier output stage voltage protection

Digital amplifier, three-value signal output method and speaker

Power amplifier

Audio switching amplifier

Class-D amplifier and electronic apparatus

Input current limited power supply and audio power amplifier for high power reproduction of nondeterministic signals

Differential output stage of an amplification device, for driving a load

Sigma-delta analog-to-digital converter

Miniature low profile speaker and case assembly

Audio amplifier, audio output circuit, integrated circuit for audio, electronic device, and method for amplifying audio signal

Switched mode amplifier with single-ended buck mode

Switched mode converter with low-voltage turn-around mode

System with multiple signal loops and switched mode converter

Switched mode converter with low-voltage linear mode

Low noise amplifier for MEMS capacitive transducers

System and method for capacitive signal source amplifier

Class-D amplifier having mixed signal feedback control

Output Coupling Capacitor Free Audio Power Amplifier Dynamically Configured for Speakers and Headphones with Excellent Click and Pop Performance

Class D audio amplifier with adjustable loop filter characteristics

PORTABLE SOUND DEVICE FOR SOUND AMPLIFICATION OF STRING INSTRUMENTS AND SIMILAR MUSICAL INSTRUMENTS

Transducer amplification circuit

Audio output circuit for driving an electroacoustic conversion element

Programmable Vacuum Tube Bias Control

Multi-stage switched-capacitor DC blocking circuit for audio frontend

Amplification systems and methods with output regulation

Current feedback output circuit

Audio power amplifier

Amplifier capable of controlling cut-off frequency in real time and amplification method for controlling cut-off frequency in real time

Current re-using wideband low-noise active balun

Integrator for class D audio amplifier

Parametric transducer with adaptive carrier amplitude

Formant amplifier

Adaptive rail voltage regulation on power supplies

Switched amplifier for a variable supply voltage

Amplifier with offset compensation

Amplifier apparatus

Amplifier with reduced idle power loss using single-ended loops

Buck-boost converter for an audio amplifier with multiple operations modes

Controlling the common mode voltage of a non-isolated buck-boost converter

Differential output mode for a multi-mode power converter

Audio amplifier with an enhanced current limiter using a proxy signal

Device and method for reducing clipping in an amplifier

Amplifier arrangement comprising a low-pass filter device

Amplifier arrangement comprising a master amplifier and at least one slave amplifier

MEANS FOR DYNAMIC ELECTRONIC OR DIGITAL PROGRAMMABLE CONTROL OF ANALOG HIGH OR LOW VOLTAGE AUDIO SIGNALS IN MUSIC INSTRUMENT AMPLIFIERS

Amplification systems and methods with one or more channels

Switching amplifier, sound output device, and audio apparatus using the same

Amplification systems and methods with distortion reductions

Differential amplifying circuit and microphone/amplifier system

Amplifier circuit and method of amplifying a signal in an amplifier circuit

Reduced crosstalk and matched output power audio amplifier

Input clamping structure for sound quality improvement in car-radio class-AB power amplifier design

Method of reducing power dissipation in a switching amplifier and circuit implementing such method

High voltage wide bandwidth amplifier

Audio demonstration kit

Audio demonstration kit

Audio demonstration kit

Audio demonstration kit

Audio demonstration kit

Amplification circuit

Systems and methods for detection of load impedance of a transducer device coupled to an audio device

Systems and methods for detection of load impedance of a transducer device coupled to an audio device

Read-out for MEMS capacitive transducers

Suspend mode in charge pump

Amplification systems and methods with one or more channels

Amplification systems and methods with one or more channels

Power amplifier providing high efficiency

Versatile audio power amplifier

Audio amplifier and power supply voltage switching method

Adaptive boost supply with slope control

Circuit for use with a loudspeaker for portable equipments

Signal envelope processing

Power supplies

Amplifier with improved noise reduction

Amplifier device and method for activating an amplifier device or the amplifier unit

Electronic lock, locking system, method of operating an electronic lock, computer program product

Amplifier circuit and amplification method

Dual bridge amplifier configuration

Differential output inductor for class D amplifier

Integrated audio amplification circuit with multi-functional external terminals

Audio amplifier power supply with inherent power factor correction

Power MOSFETs with improved efficiency for multi-channel class D audio amplifiers and packaging therefor

Programmably configured switchmode audio amplifier

Audio amplifier performance while maintaining USB compliance and power down protection

Current feedback output circuit

Amplifier circuit

Sound volume adjusting apparatus

System and method for capacitive signal source amplifier

DC offset compensation

Pop/click noise reduction circuitry for power-up and power-down of audio output circuitry

Amplification circuit and method therefor

POP noise suppression circuit and system

System and method for adjusting the sensitivity of a capacitive signal source

Control of a switched mode power supply and linear power supply for an audio device

External programmable DFE strength

Preamplifier circuit for a microelectromechanical capacitive acoustic transducer

Multi-standard, automatic impedance controlled driver with supply regulation

Amplifier circuit for a two-wire interface

Grounding switch method and apparatus

Fully differential amplifier topology to drive dynamic speakers in class AB mode

Crossover based canalphone system

Echo cancellation

Earphone power amplifier, working method, and mobile terminal equipment

Method and apparatus for efficient and distortion compensated digital class-D amplifier ternary modulation scheme

Integrated amplifier for driving acoustic transducers

Power amplifying apparatus and audio system

Electronically Orbited Speaker System

Power management controller for drivers

Output Power Limiter in an Audio Amplifier

Low-Power Modulation in an Amplifier

PWM re-clocking scheme to reject accumulated asynchronous jitter

Attenuating noise and cross-talk in an audio system by offsetting outputs in phase

Attenuating non-linear noise in an amplifier with alternating DC-offset correction

Multi-mode audio amplifiers

Current-voltage converter having a current reflector, input stage of an amplifier and corresponding amplifier

Amplification systems and methods with distortion reductions

System and method for low distortion capacitive signal source amplifier

Power supply method and apparatus

Audio amplifier power supply with inherent power factor correction

Pop and click noise reduction

Sound output device using vacuum tube, audio apparatus and method for sound output thereof

Triple mode charge-pump

Low-noise microphone pre-amplifier with active load element

Control of a loudspeaker output

Voltage controlling circuit

CONDENSER MICROPHONE

Apparatus and method for a smooth powerup of a reference signal

Efficiency optimizer of an audio power amplifier for car radio

Switched-capacitor DC blocking amplifier

Multi-tier power supply for audio amplifiers

Power supply with rectifier protection

Method of powering down an audio amplifier with timing circuit to power down bias control and amplifying circuits in sequence

ACOUSTIC APPARATUS, ACOUSTIC SYSTEM, AND AUDIO SIGNAL CONTROL METHOD

Amplifying device

Pulse width modulation for switching amplifier

Amplifier circuit and method of amplifying a signal in an amplifier circuit

Amplifier activation

Sensor with movable part and biasing

Electronic signal processor

Switching supply circuits and methods

Amplification circuit and hearing aid

Noise control circuit and audio receiving system using the same

Power supply voltage from class D amplifier

Microphone amplifier

Amplifier current consumption control

DC offset compensation

Fast power up comparator

Circuit for an amplifier

Offset cancellation for audio amplifier

Differential output inductor for class D amplifier

Distortion suppression in high-level capable audio amplification circuit

Circuit, system and method for isolating a transducer from an amplifier in an electronic device

Circuit for thermal protection in audio power amplifier and method thereof

Anti-glitch system for audio amplifier

Signal amplifier, bridge connection signal amplifier signal output device, latch-up prevention method, and program storage medium

Apparatus and method for a smooth powerup of a reference signal

Apparatus with directivity pattern

Mute control circuit and electronic device using same

OVERCURRENT PROTECTION CIRCUIT AND SEMICONDUCTOR DEVICE

Distortion compensation

Grounding switch method and apparatus

Push-pull linear hybrid class H amplifier

DYNAMIC CONSTANT POWER AMPLIFIER

Method for amplifying a signal by a power amplifier, power amplifier system, device, computer program product, and digital storage medium thereof

Method for adjusting the maximum output power of a valve power amplifier stage for an audio amplifier, and corresponding valve power amplifier stage

Multi-Channel Noise Reduction System with Direct Instrument Tracking

Bi-directional and adjustable current source

High efficiency audio amplifier system

Method and system for controlling amplifiers

Audio amplifier performance while maintaining USB compliance and power down protection

Output circuits with class D amplifier

Output circuits with class D amplifier

Circuit and method for reducing noise in class D amplifiers

Amplifier circuitry, integrated circuit and communication unit

Versatile audio power amplifier

Power supply circuit including voltage regulator and headphone driving circuit employing the same

Amplifier circuit and method of amplifying a signal in an amplifier circuit

Reducing pulse error distortion

Power amplifier and bridge circuit in power amplifier

Amplifier with reduced output transients and method therefor

Method and apparatus for power converter for class D audio power amplifiers