MP3 player with headphone amplifier card capable of being replaced

A technology of amp card and player, which is applied in the direction of information storage, static memory, digital memory information, etc., and can solve the problem that the sense of hearing cannot be realized.

Inactive Publication Date: 2012-07-04
边仿
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, the amplification circuits of portable MP3 players are all designed on the circuit board inside the player, and their output impedance is mostly 32Ω, so it is impossible for users to use different headphones to obtain different sound quality and sound effects.

Method used

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  • MP3 player with headphone amplifier card capable of being replaced
  • MP3 player with headphone amplifier card capable of being replaced
  • MP3 player with headphone amplifier card capable of being replaced

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Embodiment Construction

[0017] The present invention will be described in detail in conjunction with the accompanying drawings and specific embodiments.

[0018] An MP3 player that can replace the amp card, such as figure 1 and figure 2 Shown includes MP3 player 1, earphone jack 2 and circuit board, and described MP3 player 1 back is provided with amp card placement cavity 4, and amp card placement cavity 4 is provided with the amp of inserting amp card 5 Card socket 6; Described circuit board is provided with a MP3 digital decoding circuit 3, and MP3 digital decoding circuit is provided with the microprocessor 7 that DSP decoding chip is housed, and microprocessor 7 connects SDRAM random access memory 8, LCD display drive respectively Module 9, memory flash memory chip 10, and amplifying line dedicated power supply battery 11, microprocessor 7 connects amp card socket 6 and line output socket 12 through its analog output low-pass filter 13 on the left and right sound channel lines, described The ...

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PUM

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Abstract

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.

Description

technical field [0001] The invention belongs to the technical field of electronic digital products, relates to a portable MP3 player, in particular to an MP3 player capable of replacing an earphone card. Background technique [0002] At present, the amplification circuits of portable MP3 players are all designed on the circuit board inside the player, and their output impedance is mostly 32Ω, so it is impossible for users to use different earphones to obtain different sound quality and sound effects. Especially for some high-fidelity (Hi-Fi) headphones like "Sennheiser", "Beyerdynamic", "AKG", "Audio-Technica", their impedance is relatively high, generally between 100-300Ω Between, some even as high as 600Ω. Under the condition of satisfying the same volume, it is even more impossible to use the common 32Ω impedance of MP3 players to realize the higher driving voltage required by high-fidelity (Hi-Fi) headphones. Utility model content [0003] The purpose of the present ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G11C7/16
Inventor 边仿
Owner 边仿
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