CN202394539U

CN202394539U - Moving picture experts group audio layer III (MP3) player with replaceable earphone amplification line card

Info

Publication number: CN202394539U
Application number: CN2011205410517U
Authority: CN
Inventors: 边仿
Original assignee: Individual
Current assignee: Individual
Priority date: 2011-12-21
Filing date: 2011-12-21
Publication date: 2012-08-22
Anticipated expiration: 2021-12-21

Abstract

The utility model discloses a moving picture experts group audio layer III (MP3) player with a replaceable earphone amplification line card. The MP3 player comprises an MP3 player body, an earphone plughole and a circuit board, wherein an earphone amplification line card placing cavity is arranged on the back of the MP3 player body; an earphone amplification line card socket for plugging the earphone amplification line card is arranged in the earphone amplification line card placing cavity; an MP3 digital decoding circuit is arranged on the circuit board and comprises a microprocessor on which a digital signal processing (DSP) decoding chip is arranged, and a power supply battery special for an amplification line; the microprocessor is connected with a synchronous dynamic random access memory (SDRAM), a liquid crystal display (LCD) driver module and a memory flash chip respectively, and is also connected with the earphone amplification line card socket and a line output socket through low-pass filters on left and right analog output sound track lines of the microprocessor; the earphone amplification line card socket is connected with the power supply battery special for the amplification line, and is also connected with the earphone plughole through the earphone amplification line card. According to the MP3 player, earphone amplification line cards with different output impedances are plugged on the earphone amplification line card socket, and an earphone matched with the earphone amplification line cards is connected, so that auditory impression effects with different acoustic qualities can be achieved.

Description

A kind ofly can change the MP3 player that ear is put card

Technical field

The utility model belongs to the electronic digital product technical field, relates to the carry-on player of a kind of MP3, is specifically related to a kind ofly can change the MP3 player that ear is put card.

Background technology

Carry-on MP3 player amplifying circuit all is to design on the wiring board of player the inside at present, and their output impedance mostly is 32 Ω, therefore the user is wanted that the sense of hearing of using different earphones to obtain different tonequality audios but can't realize.Especially wait some high-fidelities (Hi-Fi) earphone for picture " Sen Haisaier ", " visiing inferior power ", " AKG ", " iron triangle ", their impedance phase to all than higher, generally between 100～300 Ω, some in addition up to 600 Ω.Satisfying under the condition of identical volume, wanting to realize that with 32 common Ω impedances of MP3 player the required higher promotion voltage of high-fidelity (Hi-Fi) earphone is impossible especially.

The utility model content

The purpose of the utility model provides a kind of MP3 player that can change earphone amplifying circuit card (the abbreviation ear is put card); The MP3 digital decoding circuit that it is provided with through the MP3 player; Can put card at the ear that ear is put on the card socket the different output impedance of pegging graft; Insert the earphone that is complementary in earphone jack again, just can obtain the sense of hearing of different tonequality audios, solved the not abundant problem of acoustical quality that existing MP3 player exists.

The technical scheme that the utility model adopted is; A kind ofly can change the MP3 player that ear is put card; Comprise MP3 player, earphone jack and wiring board, the described MP3 player back side is provided with ear and puts the card placed cavity, and ear is put the card placed cavity and is provided with the grafting ear and puts the ear of card and put the card socket; Described wiring board is provided with a MP3 digital decoding circuit; MP3 digital decoding circuit is by being provided with the microprocessor that the DSP decoding chip is housed; Microprocessor connects SDRAM random access memory, LCD display driver module, memory flash chip respectively; And amplifying circuit power source special battery; Microprocessor is put card socket and circuit accessory power outlet through the low-pass filter engaging lug on its simulation output left and right acoustic channels circuit road, and described ear is put the card socket and is connected with amplifying circuit power source special battery, and puts card through ear and be connected with earphone jack;

Described ear is put being defined as of pin that card and ear are put the card socket:

1～3：L_IN；4～6：GND；7～9：R_IN；10～18：GND；19～21：-5V?MAX?100mA；22～23：GND；24～26：+5V?MAX?100mA；27～28：+7.4V?MAX?100mA；29～30：-7.4V?MAX?100mA；34～35：L_OUT；36～37：GND；38～39：R_OUT；41～47：GND。

The utility model is described can change the MP3 player that ear is put card, and its characteristic also is,

Described ear is put card for a plurality of, and each ear is put and is provided with the amplifying circuit that is fit to different tonequality earphones in the card.

Described power source special battery is 7.4 volts of lithium batteries.

The utility model can be changed the MP3 player of ear amplifying circuit card; Through the amplifying circuit that is provided with very wide range of linearity; Thereby also possessed the ear-phone function that can drive different impedances; The ear of putting on the card jack interface the different output impedance of coupling of pegging graft at ear is put card, again earphone jack insert be complementary earphone, just can obtain the sense of hearing of different tonequality audios through the tuning effect that ear is put card; Satisfied the special demands of different crowd fully, made different high-fidelity headphone acoustics profits manifest incisively and vividly MP3 player sound tonequality.

Description of drawings

Fig. 1 is the MP3 player structural representation that the utility model can be changed ear amplifying circuit card;

Fig. 2 is the MP3 player fundamental diagram that the utility model can be changed ear amplifying circuit card;

Fig. 3 a is that the utility model MP3 player ear is put card socket deployed configuration and pin definition synoptic diagram;

Fig. 3 b and Fig. 3 c are that the utility model MP3 player ear is put card pin definition synoptic diagram.

Among the figure, 1.MP3 player, 2. earphone jack, 3. amplifying circuit; 4. ear is put the card placed cavity, and 5. ear is put card, and 6. ear is put card socket, 7. microprocessor; 8.SDRAM random access memory, 9.LCD display driver module, 10. memory flash chip; 11. the power source special battery, 12. circuit accessory power outlets, 13. low-pass filters.

27-52 is that ear is put card A face pin pin position; 1-26 is that ear is put card B face pin pin position.

Embodiment

In conjunction with accompanying drawing and embodiment the utility model is elaborated.

A kind ofly can change the MP3 player that ear is put card, MP3 player 1, earphone jack 2 and the wiring board of comprising as depicted in figs. 1 and 2, described MP3 player 1 back side is provided with ear and puts card placed cavity 4, and ear is put card placed cavity 4 and is provided with the grafting ear and puts the ear of card 5 and put card socket 6; Described wiring board is provided with a MP3 digital decoding circuit 3; MP3 digital decoding circuit is by being provided with the microprocessor 7 that the DSP decoding chip is housed; Microprocessor 7 connects SDRAM random access memory 8, LCD display driver module 9, memory flash chip 10 respectively; And amplifying circuit power source special battery 11; Microprocessor 7 is put card socket 6 and circuit accessory power outlet 12 through low-pass filter 13 engaging lugs on its simulation output left and right acoustic channels circuit road, and described ear is put card socket 6 and is connected with amplifying circuit power source special battery 11, and puts card 5 through ear and be connected with earphone jack 2;

The ear of the utility model is put being defined as of pin that card 5 and ear are put card socket 6:

The described ear of the utility model is put card 5 for a plurality of, and each ear is put and is provided with the amplifying circuit that is fit to different tonequality earphones in the card 5, and described power source special battery 11 is 7.4 volts of lithium batteries.

The utility model can be changed the MP3 player of ear amplifying circuit card; The start back begins to supply power to complete machine through amplifying circuit power source special battery 11; The microprocessor 7 that the DSP decoding chip is housed is carried out boot program through SDRAM random access memory 8, lights display screen to LCD display driver module 9 write orders.The display the play various duties of machine of the display screen of MP3 player of this moment; When the user carries out when selecting in the memory flash chip 10 music or song; Microprocessor 7 programs are carried out play command and are begun playing back music or song, and the DSP decoding chip in the microprocessor 7 divides left and right acoustic channels output after beginning digital signal decoding become simulating signal, through low-pass filter 13; One the road is connected to circuit accessory power outlet 12, supplies the independent power amplifier of peripheral hardware to make input signal source usefulness; Another road output is connected to ear and puts card socket 6; The ear that ear is put the amplifying circuit of the different designs of can pegging graft on the card socket 6 is put card 5; In order to mate the earphone of different impedances; Each pin of putting card socket 6 through ear will be exported the ear that signal and electric current and voltage be transported to grafting and put on the card 5, put signal after the amplifying circuit processing and amplifying of card 5 through ear and put card socket 6 through the ear that connects again and output to earphone jack 2, and the confession user inserts different earphone music appreciating or song.

The ear that the utility model can be changed the MP3 player peripheral hardware of ear amplifying circuit card is put card and can be changed; And putting card socket 6 and ear to the ear of MP3 player setting puts the interface circuit of card 5 and carries out standard; Make can the peg graft independent ear of multiple different designs amplifying circuit of a MP3 player put card; Insert the earphone of different output impedance in earphone jack 2 again, just can put the different tonequality audio of amplifying circuit acquisition of card 5, satisfy individual's best sense of hearing through ear.

Above-mentioned embodiment is an instance of the utility model; Not enforcement and the interest field that is used for limiting the utility model; All equivalences of making according to the described content of the utility model patent protection scope change and modify, and all should be included in the utility model claim.

Claims

1. can change the MP3 player that ear is put card for one kind; Comprise MP3 player (1), earphone jack (2) and wiring board; It is characterized in that described MP3 player (1) back side is provided with ear and puts card placed cavity (4), ear is put card placed cavity (4) and is provided with the grafting ear and puts the ear of card (5) and put card socket (6); Described wiring board is provided with a MP3 digital decoding circuit (3); MP3 digital decoding circuit (3) is by being provided with the microprocessor (7) that the DSP decoding chip is housed; Microprocessor (7) connects SDRAM random access memory (8), LCD display driver module (9), memory flash chip (10) respectively; And amplifying circuit power source special battery (11); Microprocessor (7) is put card socket (6) and circuit accessory power outlet (12) through low-pass filter (13) engaging lug on its simulation output left and right acoustic channels circuit road, and described ear is put card socket (6) and is connected with amplifying circuit power source special battery (11), and puts card (5) through ear and be connected with earphone jack (2);

Described ear is put being defined as of pin that card (5) and ear are put card socket (6):

1～3：L_IN；4～6：GND；7～9：R_IN；10～18：GND；19～21：-5VMAX?100mA；22～23：GND；24～26：+5V?MAX?100mA；27～28：+7.4V?MAX?100mA；29～30：-7.4V?MAX?100mA；34～35：L_OUT；36～37：GND；38～39：R_OUT；41～47：GND。

2. according to claim 1ly can change the MP3 player that ear is put card, it is characterized in that, described ear is put card (5) for a plurality of, and each ear is put the amplifying circuit that is provided with suitable different tonequality earphones in the card (5).

3. according to claim 1ly can change the MP3 player that ear is put card, it is characterized in that described power source special battery (11) is 7.4 volts of lithium batteries.