High-fidelity (Hi-Fi) audio adapter

Abstract

The invention discloses a high-fidelity (Hi-Fi) audio adapter. The Hi-Fi audio adapter comprises a housing, a coaxial terminal which is arranged on the housing, a universal serial bus (USB) terminal, an audio output terminal, an earphone socket and an electronic control board which is arranged inside the housing. The electronic control board is provided with audio digital-to-analogue conversion circuits and an earphone amplifying circuit. The audio digital-to-analogue conversion circuit is used for digital-to-analogue conversion to coaxial digital audio signals or USB digital audio signals. One audio digital-to-analogue conversion circuit is output to the audio output terminal to supply signal input for an external power amplification device, another audio digital-to-analogue conversion circuit is transmitted to the earphone amplifying circuit for the power amplification and then is output to the earphone socket to promote the earphone output. The Hi-Fi audio adapter can be inserted to existing audio equipment which can not meet the requirements of Hi-Fi output such as a computer, a set top box, and a compact disc (CD) player. The Hi-Fi audio adapter is used for switching and outputting the Hi-Fi audio signals of the audio equipment and promotes a back end sound reproduction device or a high resistance headphone to perfectly present the high-fidelity voice.

Description

technical field [0001] The invention belongs to the technical field of audio processing, and in particular relates to an audio switching device for converting and processing Hi-Fi audio signals. Background technique [0002] Hi-Fi is the abbreviation of English High-Fidelity, which means "high fidelity". The so-called "high fidelity" refers to the playback sound that is highly similar to the original sound, which belongs to a high-end audio technology. In the field of Hi-Fi, high-end audio technology generally uses audio equipment such as desktop CDs and turntables to perform digital-to-analog conversion on Hi-Fi audio signals, and then plays them through audio equipment such as power amplifiers to achieve high-quality sound output. [0003] In view of the current development situation, electronic products such as PCs, notebook computers, and tablet computers are becoming more and more popular. The sound output of existing computer products is basically based on integrated...

AI Technical Summary

Problems solved by technology

[0005] 1. This independent sound card can only be used on desktop computers, but the recently popular laptops and tablet computers cannot enjoy the Hi-Fi audio brought by the upgraded sound card, which seriously restricts the application range of this independent sound card

[0006] 2. The current sound cards are all based on PCI slots, using PCI bus for transmission, and their power supply voltage is only 5V; while the audio amplifier circuit used for power amplifier processing of Hi-Fi signals often needs a power supply voltage of plus or minus 9V or more , so under the power supply voltage of the sound card, it cannot meet the Hi-Fi requirements

[0007] 3. There are also many small USB sound cards on the market, which take power directly from the USB interface. There is also the problem that the power supply of the sound card cannot meet the power supply requirements of the Hi-Fi audio amplifier circuit, and it will also appear powerless when driving high-impedance headphones.

In such an application scenario, if there is no integrated excellent headphone amplifier circuit, the Hi-Fi effect will be out of the question.

However, sound cards under low-voltage power supply conditions cannot meet the driving requirements for high-impedance headphones.

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