46 results about "Headphone amplifier" patented technology

A method of powering an audio output device of a computer system, by determining whether a passive or active audio output device is connected to an audio output jack of the computer system and, based on this determination, providing an appropriate power level to the audio output jack. For example, if the determination is made that a passive audio output device is connected to the audio output jack, then a 3-watt power signal is applied to the audio output jack, but if the determination is made that an active audio output device is connected to the audio output jack, then a ¼-watt power signal is applied to the audio output jack. The type of audio output device present may be determined by sensing an impedance at the audio output jack. This sensing may be performed by comparing a load voltage associated with the impedance to a reference voltage. The output of a switch device (multiplexer) having a first input from an AC97 audio codec and headphone amplifier and a second input from a passive speaker amplifier is selectively controlled by the sensing circuit.

A method of powering an audio output device of a computer system, by determining whether a passive or active audio output device is connected to an audio output jack of the computer system and, based on this determination, providing an appropriate power level to the audio output jack. For example, if the determination is made that a passive audio output device is connected to the audio output jack, then a 3-watt power signal is applied to the audio output jack, but if the determination is made that an active audio output device is connected to the audio output jack, then a ¼-watt power signal is applied to the audio output jack. The type of audio output device present may be determined by sensing an impedance at the audio output jack. This sensing may be performed by comparing a load voltage associated with the impedance to a reference voltage. The output of a switch device (multiplexer) having a first input from an AC97 audio codec and headphone amplifier and a second input from a passive speaker amplifier is selectively controlled by the sensing circuit.

The multimodal headset may include: a first earpiece including a first earphone speaker and external speaker; a second earpiece including a second earphone speaker and external speaker; a controller for operating the multimodal headset in at least three modes, the controller may include: a power switch; a speaker switch; an earphone amplifier circuit; a speaker amplifier circuit; and a power source, wherein the power source is positioned within the first or second earpiece; wherein the input signal is routed to the earphone speakers, bypassing the earphone amplifier circuit, when the power switch is in an off position, wherein the input signal is routed through the earphone amplifier circuit to the earphone speakers when the power switch is in an on position and the speaker switch is in an internal earpiece position, and wherein the input signal is routed through the speaker amplifier circuit to the external speakers when the power switch is in the on position and the speaker switch is in an external speaker position.

This invention allows a plurality of users to listen to different sounds at high sound quality. This invention provides a selector 16 for selecting audio signals corresponding to requests from a plurality of users, headphone amplifiers 17A and 17B for individually outputting the selected audio signals to the corresponding users, and the speaker amplifier 20 for outputting a mixed bass signal created by extracting and mixing only the bass components of the selected audio signals, to all the users. As a result, each of the users can listen to different desired sound in a situation where the bass components of the users' desired sounds are mixed and output to all the users.

A class G headphone amplifier circuit with improved power efficiency and low EMI. It may use an automatic signal level detector to detect the signal level of incoming signals and determine positive and negative power supplies for headphone amplifiers accordingly. A voltage generator may generate pairs of differential output voltages at a plurality of amplitude steps, and supply to headphone amplifiers the pair with the amplitude determined by the automatic signal level detector. As a result, headphone amplifiers are biased according to the input signal level, and the multiple voltage rails may improve power efficiency and avoid clipping.

The invention discloses a multi-earphone volume control circuit and a control method. The multi-earphone volume control circuit comprises a coder-decoder for performing digital-to-analogue conversion on audio signals, and a single chip; the audio output end of the coder-decoder is simultaneously connected with the audio input ends of a plurality of earphone amplifiers, respectively; the audio output end of each earphone amplifier is correspondingly connected with an earphone; the single chip comprises a plurality of volume regulating command output ends which are correspondingly connected with the volume regulating command input ends of the earphone amplifiers one to one; one volume regulating command output end of the single chip is connected with the control signal input end of the coder-decoder. The multi-earphone volume control circuit and the control method have the advantages that the plurality of earphone amplifier are correspondingly connected with the corresponding earphones, respectively, and used for processing the audio signals of the earphone connected with the earphone amplifiers, and therefore, the volume of each earphone is controlled separately, individual difference can be eliminated and the design is more practical.

Systems for a loss of power detection for headset amplifiers are disclosed. The system generally includes a headset and headset amplifier. The headset amplifier includes a switch for electrically connecting the headset and a telephone apparatus. The switch is closed when the headset amplifier is in a powered status and the switch is open when the headset amplifier is in a powerless status.

The invention discloses an audio playing device and method as well as a mobile terminal. The audio playing device comprises an audio processing chip, an audio amplifier, a loudspeaker and a receiver, wherein a first port of the audio processing chip is connected with an input end of the audio amplifier and the receiver respectively and connected to a speech current amplifier inside the audio processing chip; an output end of the audio amplifier is connected with the loudspeaker. When audio information is transmitted to the audio processing chip, the speech current amplifier inside the audio processing chip transmits the audio information to the audio amplifier through the first port and then transmits the audio information to the loudspeaker for playing after amplifying the audio information, so that the problem that the user experience is affected due to the fact that the volume of earphones increases suddenly is solved. According to the device, all that is required is to connect the audio amplifier and the loudspeaker to a circuit between the first port and the receiver instead of additionally configuring an analog switch and an earphone amplifier, so that the cost is saved.

The present invention provides a headphone amplifier circuit capable of canceling the influence of a parasitic resistance developed thereinside thereby to improve channel separation and increase output amplitude thereof. When audio signals respectively inputted to minus input terminals via resistors are amplified by inverting amplifiers each having a negative feedback circuit including a resistor and thereafter applied to input ends of left and right headphones, and the voltage of a preset potential is applied to each of output terminals of the headphones by an amplifier, a center output terminal of the amplifier and plus input terminals of the inverting amplifiers are connected to one another via resistors, and the plus input terminals of the inverting amplifiers are grounded via resistors respectively.

Provided herein are a headphone amplifier circuit for a headphone driver, an operation method thereof, and a universal serial bus (USB) interfaced headphone device using the same. The output stage of the headphone amplifier circuit is improved to have a differential output structure so as to effectively solve the crosstalk issue and increase the isolation between the left and the right channels such that the audio content presents a spatial perception and a distance perception more specifically.

A compact portable stereo headphone amplifier system for use with a conventional stereo audio source, such as a cassette or compact disc player, in which components are located on both sides of a circuit board and in which left channel components and right channel components are located on opposite sides of the circuit board thereby providing a compact unit.

An audio output circuit includes a DAC module, a line out circuit, and a headphone amplifier circuit. The digital to analog conversion (DAC) module is coupled to convert an audio component of digitized multimedia data into an analog audio signal. The line out circuit is coupled to amplify the analog audio signal based on a line out volume setting. The headphone amplifier is coupled to amplify the analog audio signal based on a volume setting to produce an amplified analog audio signal.

A compact portable stereo headphone amplifier system for use with a conventional stereo audio source, such as a cassette or compact disc player, in which components are located on both sides of a circuit board and in which left channel components and right channel components are located on opposite sides of the circuit board thereby providing a compact unit.

The invention discloses an earphone amplifier with a switch-off function and without output capacitor. A bandgap reference circuit is used for supplying a reference voltage to an oscillator circuit and supplying a reference bias current to an earphone operational amplifier. The oscillator circuit is used for supplying a switching frequency to a charge pump circuit. The charge pump circuit is used for supplying a negative voltage source to the earphone operational amplifier. The earphone operational amplifier is used for enabling output bias of an earphone to be lowest. A switch-off control circuit is used for switching off a charge pump, thereby enabling a whole circuit to be in low power consumption. According to the earphone amplifier, the negative voltage source is generated through adoption of the charge pump circuit, so the output bias of the earphone is enabled to be lowest. Compared with a traditional single-power earphone driver, the earphone amplifier has the advantages that an output dynamic range is almost doubled, a big size direct current blocking capacitor is unnecessary, a circuit board space is reduced, and the cost is reduced.

A headset is provided including a first earpiece having a first earphone speaker and external speaker; a second earpiece having a second earphone speaker and external speaker; a controller with at least three operational modes, the controller including a power switch; a speaker switch; an earphone amplifier circuit; a speaker amplifier circuit; and a power source; the power source being positioned within the first or second earpiece; the input signal routed directly to the earphone speakers when the power switch is in an off position, the input signal routed through the earphone amplifier circuit to the earphone speakers when the power switch is in an on position and the speaker switch is in an internal earpiece position, and the input signal routed through the speaker amplifier circuit to the external speakers when the power switch is in the on position and the speaker switch is in an external speaker position.

The invention relates to an earphone loudspeaker with USB sound card and collecting tray, used in computer, wherein it is formed by voice power amplifier, USB collecting tray, USB sound card circuit, USB plug line, USB plug, power output earphone plug, and frame; USB plug is connected to the USB plug of computer; when the USB plug is connected, the computer USB plug can transmit data and power, to connect the anode and ground line of amplifier to computer, to be powered, to confirm normal operation; and the data line can feed digit signal from USB plug to the sound card to be decoded to obtain high-quality voice, to be amplified by earphone amplifier.

The invention discloses an MP3 player a headphone amplifier card capable of being replaced, which comprises an MP3 player body, a headphone jack and a circuit board. A headphone amplifier card placing cavity is arranged at the back of the MP3 player body and provided with a headphone amplifier card socket for inserting the headphone amplifier card. The circuit board is provided with an MP3 digital decoding circuit, the MP3 digital decoding circuit is provided with a microprocessor provided with a digital signal processor (PSP) decoding chip, the microprocessor is respectively connected with a synchronous dynamic random access memory (SDRAM), a liquid-crystal display (LCD) display driving module, a memory flash memory chip and a power supply battery special for an amplifier circuit, the microprocessor is connected with the headphone amplifier card socket and a circuit output socket through low-pass filters on a left analog-output sound track wire and a right analog-output sound track wire, the headphone amplifier card socket is connected with the power supply battery special for the amplifier circuit and connected with the headphone jack through the headphone amplifier card. The MP3 player with the headphone amplifier card capable of being replaced inserts headphone amplifier cards with different output impedances into the headphone amplifier card socket and connects headphones matched with the headphone amplifier cards so as to be capable of obtaining audio effects with different tone quality.

The embodiments of the invention provide a headphone amplifier circuit for a headphone unit and an operation method thereof, and an earphone device using the same with a USB interface. The output stage of the headphone amplifier circuit is improved to a differential output structure to effectively solve the problem of crosstalk interference between left and right channels and then increase the separation of the left and right channels, so that the senses of space and distance contained in the audio content can be presented more specifically.

The invention discloses a portable headphone amplifier casing for improving bandage stability. The portable headphone amplifier casing includes a casing body, first fixing grooves which are mutually symmetrically distributed are formed in the upper and lower ends of one side of the bottom of the casing, clamping plates are disposed in the first fixing grooves, the inner side of each first fixing groove is provided with a second fixing groove communicated with the first fixing groove, a first rotating wheel and a second rotating wheel which are symmetrically distributed are disposed in each second fixing groove, the first rotating wheel is connected with the second rotating wheel through a fixing belt, one side of the fixing belt is connected with the inner side of the clamping plate, the second rotating wheels are connected with a rotating shaft in the form of gear meshing, the upper end of the bottom of the casing is provided with a first adjusting groove, and an adjusting gear is arranged in the first adjusting groove. The other side of the bottom of the casing is provided with a first clamping groove clamped with the clamping plate, and the joint of the fixing belt and the clamping plate is provided with an elastic belt. The inner side of the fixing belt is provided with anti-sliding rubber, the anti-sliding rubber is distributed in a segmented mode, and the length of the anti-sliding rubber is equal to the width of the casing. The design is simple to operate, and the portable headphone amplifier casing is high in comprehensive practicality and easy to popularize and use.

The invention discloses a portable headphone amplifier housing capable of flexibly adjusting degree of tightness, including a shell, wherein the upper and lower ends on one side of the bottom of the shell are provided with first fixing slots symmetrically distributed with each other, the first fixing slots are provided with clamping plates therein, second fixing slots communicating with the firstfixing slots are disposed on the inner sides of the first fixing slots respectively, a first rotating wheel and a second rotating wheel that are symmetrically distributed are disposed in the second fixing slots, the first rotating wheel and the second rotating wheel are connected through a fixing belt, one side of the fixing belt is connected to the inner sides of the clamping plates, the second rotating wheels are connected with a rotating shaft by gear engagement, the upper end of the bottom of the shell is provided with a first adjusting groove that is provided with an adjusting gear inside, the other side of the bottom of the shell is provided with a first clamping slot engaged with the clamping plates, and the bottom of the adjusting groove is provided with fixing blocks symmetricallydistributed and engaged with the adjusting gear. The invention is simple in design and operation, strong in comprehensive practicability, and easy to promote and use.

The invention discloses an audio playing device and method as well as a mobile terminal. The audio playing device comprises an audio processing chip, an audio amplifier, a loudspeaker and a receiver, wherein a first port of the audio processing chip is connected with an input end of the audio amplifier and the receiver respectively and connected to a speech current amplifier inside the audio processing chip; an output end of the audio amplifier is connected with the loudspeaker. When audio information is transmitted to the audio processing chip, the speech current amplifier inside the audio processing chip transmits the audio information to the audio amplifier through the first port and then transmits the audio information to the loudspeaker for playing after amplifying the audio information, so that the problem that the user experience is affected due to the fact that the volume of earphones increases suddenly is solved. According to the device, all that is required is to connect the audio amplifier and the loudspeaker to a circuit between the first port and the receiver instead of additionally configuring an analog switch and an earphone amplifier, so that the cost is saved.

An earphone comprises a main control chip, a stereo digital earphone amplifier powered by a single power supply, and a loudspeaker, wherein the main control chip obtains an audio signal to be processed, decodes the audio signal to be processed to obtain a first audio signal, carries out mirroring processing on the first audio signal to obtain a second audio signal, and transmits the first audio signal and the second audio signal to the stereo digital earphone amplifier; and the stereo digital earphone amplifier performs digital-to-analog conversion and amplification on the first audio signal and the second audio signal to respectively obtain a third audio signal and a fourth audio signal, and transmits the third audio signal and the fourth audio signal to the loudspeaker to drive the loudspeaker. According to the earphone, the driving voltage and the output power of the loudspeaker can be improved under the condition that power is supplied by a single power supply, the complex matching of an earphone circuit structure is avoided, and the cost is also prevented from being increased.

The invention discloses a portable headphone amplifier housing for improving the recovery efficiency of fixing bands. The portable headphone amplifier housing comprises a shell, symmetrically distributed first fixing grooves are formed in upper and lower ends of one side of the bottom of the shell, clamping plates are arranged in the first fixing grooves, second fixing grooves communicating with the first fixing grooves are formed in the inner sides of the first fixing grooves, first rotating wheels and second rotating wheels, which are symmetrically distributed, are arranged in the second fixing grooves, the first rotating wheels and the second rotating wheels are connected through the fixing band, one side of each fixing band is connected with the inner sides of the clamping plates, thesecond rotating wheels are connected with rotating shafts in a gear engagement manner, a first adjustment groove is formed in the upper end of the bottom of the shell, an adjustment gear is arrangedin the first adjustment groove, first necks clamped with the clamping plates are formed in the other side of the bottom of the shell, the second rotating wheels are connected with one ends of the fixing bands through ruler springs, and the design is simple in operation, high in comprehensive practicality, and is easy to popularize and use.

A digitally controlled microphone with audio compressor includes a capsule; a compressor circuitry having a compressor engine, a digitally controlled root mean square (RMS) detector and a digitally controlled analog processor; a bypass switch to the compressor circuitry; an analog to digital converter (ADC); a digital processor that sends digital audio to a host and receives a second digital audio signal; a digital to analog converter (DAC) and a summing circuit that combine the audio with the audio from the host and send it to a digitally-controlled headphone amplifier and a headphone jack; a microphone body; a serial host interface connector; and hardware controls on the microphone body.

The invention relates to one audio earphone amplifier in electron sound technique field, which comprises front appendix buffer circuit, core power drive circuit, source direct current servo circuit, wherein, the audio input signals pass through level part, first integration computation amplifier, resistance RR2, first integration amplifier LM4766, resistance RoR1 and earphone socket; the resistance RR5 are over resistance RoR1 and LM4766 reverse phase end; LM4766 reverse phase input end is connected to earth resistance RR3; the resistance RR7 are over connection point and second integration amplifier NE5532 input end.

The utility model discloses a multi-channel Bluetooth earphone with an earphone amplifier. The earphone comprises an earphone support and earmuffs. The earphone support comprises a main support and two auxiliary supports arranged at the two ends of the main support. A chip bin and a guide rail are arranged on the main support; and the chip bin is arranged in the middle of the earphone support. A Bluetooth module and an amplifier module are arranged in the chip bin, the Bluetooth module is used for receiving a digital signal of audio from sound source equipment, and the amplifier module is usedfor converting the digital signal acquired by the Bluetooth module into an analog signal and modulating the analog signal into an electric signal for driving the Bluetooth headset; sound production units are symmetrically arranged in the two earmuffs, and the number of the sound production units arranged in each earmuff is larger than one. The plurality of sound production units form a multi-channel surround sound system.

A single integrated circuit (9) may comprise: a signal path configured to generate an output signal (VOUT) from an input signal (VIN), where the signal path comprises an amplifier (16) configured to drive the output signal (VOUT); a direct current-direct current (DC-DC) power converter (10) having a power inductor integrated in a single integrated circuit (9) and configured to generate a supply voltage (VSUPPLY) from the source voltage to the DC-DC power converter (10) to the amplifier; and a control circuit for controlling operation of a converter switch of the DC-DC power converter (10) such that the supply voltage (VSUPPLY) tracks at least one of the input signal (VIN) and the output signal (VOUT).

The invention discloses a mobile audio power supply system and an audio output and charging method. The system includes a mobile terminal, a headphone and a mobile audio power supply, wherein the mobile audio power supply includes a connection circuit, a data transmission circuit, a power supply circuit, a control circuit, an audio decoding circuit and a headphone amplifier. The method includes the following steps: the mobile terminal is connected through a data line of the mobile audio power supply; the mobile audio power supply sends a control instruction to the mobile terminal to ensure that the mobile terminal enables a working mode of simultaneously charging and outputting an audio; the power supply circuit stores electric energy and charges the mobile terminal; and the headphone is connected to the mobile audio power supply through high and low resistance audio interfaces to obtain audio output. According to the scheme of the invention, the defects that some mobile terminal interfaces cannot simultaneously perform charging and audio output acquisition can be overcome, especially when a user needs to use the mobile audio power supply disclosed by the invention to charge the mobile terminal and acquire the audio output at the time of going out, the user experience can be greatly improved.