46 results about "Headphone amplifier" patented technology

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.

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.

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.

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.

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.