CN201199449Y

CN201199449Y - Vehicle-mounted Chinese display numeral acoustics player

Info

Publication number: CN201199449Y
Application number: CNU2008200291562U
Authority: CN
Inventors: 何根洪
Original assignee: Individual
Current assignee: Individual
Priority date: 2008-05-21
Filing date: 2008-05-21
Publication date: 2009-02-25
Anticipated expiration: 2018-05-21

Abstract

The utility model relates to a vehicle-bone digital sound player which can show Chinese characters; a panel of a player host is provided with a dot-matrix liquid crystal display, a functional key group, a USB interface, a power switch and an audio-frequency input interface; a host acoustic circuit arranged in the host shell consists of a main control circuit, a double-memory circuit, an audio-frequency A/D converter, an audio-frequency power amplifier, a liquid crystal driving circuit, a dot-matrix liquid crystal display and the like. When in use, music signals output by the main control circuit is converted into analog signals by an audio-frequency D/A converter, amplified by the audio-frequency power amplifier to drive a sound box to produce sound; and simultaneously, the information of the name of the song output by the main control circuit is displayed by the liquid crystal screen. The vehicle-bone digital sound player adopts all-electronic design without mechanical wear, has high vibration resistance, can play the music of MP3, I pod and the like stored in a U-disk and display the name of the song in Chinese or other languages, is convenient for selecting songs, makes full use of the internet, freely obtains music resource and provides an ideal selection for a new generation automobile sound for wide automobile owners.

Description

Vehicle-mounted Chinese display digital acoustics player

Technical field

The utility model belongs to the digital acoustics equipment technical field, relates to a kind of vehicle-mounted Chinese display digital acoustics player that can be used for playing the music such as MP3, Ipod of storage in " U " dish.

Background technology

Vehicle-mounted tone playing equipment well known in the art mainly contains tape recorder and reproducer, CD cassette player, DVD cassette player or the composite set of above-mentioned several functions at present, and it exists subject matter to be in actual use: 1. anti-seismic performance is not good, easily blocks the dish cassette tape; 2. need constantly to buy tape, CD, with the update playing content; 3. in can not showing, foreign language song (song) name, be not easy to choosing song (song); 4. the dish belt body is long-pending big, and it is many to take up room, and memory space is little.Up to now, but the steam supply car install can play-over digital form music such as MP3, Ipod and show in, the vehicle-mounted Chinese display digital acoustics player of foreign language title of the song is not seen in report as yet in this area.

The utility model content

The purpose of this utility model is the problem that this area aforementioned background art exists is solved, adopt current popular MP3, Ipod technology and use embedded system, and then design a kind of can be used for playing digital form music such as MP3, Ipod and can directly demonstrate in, the vehicle-mounted Chinese display digital acoustics player of foreign language song (song) name, the user can be made full use of internet, obtain free music source.

The technical solution that adopts is so for achieving the above object: the vehicle-mounted Chinese display digital acoustics player that is provided is made up of the main frame acoustics circuit that is installed in the host shell in vehicle cab or the compartment and is located at host shell inside, wherein, host panel is provided with matrix liquid-crystal display screen, function key group, USB interface, power switch and audio input interface; In addition, be located at the interior main frame acoustics circuit of host shell by main control circuit, the dual-memory circuit, audio A/D transducer, audio-frequency power amplifier, liquid crystal display drive circuit, matrix liquid-crystal display screen and power circuit are formed, the power amplifier control output end of main control circuit is connected to the input end of audio-frequency power amplifier through audio A/D transducer, the I/O end of dual-memory circuit connects with the storer output/input end of main control circuit, and the input end of liquid crystal display drive circuit and output terminal connect with the liquid crystal display output terminal of main control circuit and the input end of matrix liquid-crystal display screen respectively.In the work, the music signal of being exported by main control circuit converts simulating signal to through audio frequency D/A transducer, amplifies by audio-frequency power amplifier, drives the speaker sounding; Simultaneously,, behind liquid crystal display drive circuit, show by LCDs again by China and foreign countries' title of the song information (title of the song) of main control circuit output.

Compared with prior art, vehicle-mounted Chinese display digital acoustics player described in the utility model has the following advantages: have music, song source widely 1., compare existing equipment products such as videocorder, CD cassette player and DVD cassette player, the utility model can make full use of internet, freely obtain music sources, the form of obtaining is convenient, extensive; 2. show domestic and abroad title of the song by liquid crystal display, the choosing song is convenient; 3. product all electronic design does not have any mechanical wear and has good seismic resistance, and the life-span is long, and is reliable and stable; 4. data message is by semiconductor storage, and volume is little, capacity is big, easily preservation, has vast market prospect in the automobile audio application, selects for numerous car owners provide the ideal of young mobile sound equipment.

Description of drawings

Fig. 1 is a schematic appearance of the present utility model.

Fig. 2 is the main frame acoustics circuit theory diagram of this vehicle-mounted Chinese display digital acoustics player.

Fig. 3～Fig. 7 is the circuit theory diagrams of an embodiment of vehicle-mounted Chinese display digital acoustics player main frame acoustics circuit, wherein Fig. 3 is the circuit theory diagrams of main control circuit, Fig. 4 and Fig. 5 respectively are the circuit theory diagrams of a memory circuitry, Fig. 6 is the circuit theory diagrams of audio A/D transducer and audio-frequency power amplifier, Fig. 7 be power circuit circuit theory diagrams.

Embodiment

Referring to accompanying drawing, vehicle-mounted Chinese display digital acoustics player described in the utility model mainly comprises housing 1, panel 2 and the main frame acoustics circuit that is arranged in the housing 1.Host shell panel 2 is provided with matrix liquid-crystal display screen 3, function key group 4, USB interface 5, power switch 6 and audio input interface 7, as shown in Figure 1.This outside drawing only for signal, can be made into multiple style with housing according to design concept during production.Foreign language song (song) name, radio reception frequency and menu etc. during matrix liquid-crystal display screen 3 can show.Function key group 4 is used for function selecting, as: volume, select song, F.F., high bass etc.USB interface is used for connecting " U " dish or connects various storage cards by " U " dish interface, the music that broadcast is wherein deposited, and USB interface is generally wired connection, when needing, also can be used for the data-interface as other agreement, but also wireless link.Power switch 6 is used for start or shutdown.Audio input interface 7 is wired connection or wireless connections, is used to external source of sound that power amplifier and audio amplifier are provided, and all can insert vehicle-mounted Chinese display digital acoustics as walkman, MP3, Ipod, CD etc.

The structure of main frame acoustics circuit and principle of work are as shown in Figure 2 in the utility model, it is by main control circuit 8, dual-memory circuit 9, audio A/D transducer 10, audio-frequency power amplifier 11, liquid crystal display drive circuit 12, matrix liquid-crystal display screen 3 and power circuit 13 are formed, the power amplifier control output end of main control circuit 8 is connected to the input end of audio-frequency power amplifier 11 through audio A/D transducer 10, the I/O end of dual-memory circuit 9 connects with the storage output/input end of main control circuit 8, and the input end of liquid crystal display drive circuit 12 and output terminal connect with the liquid crystal display output terminal of main control circuit 8 and the input end of matrix liquid-crystal display screen 3 respectively.During work, the main frame internal circuit reads the music signal of storage in " U " dish under the control of main control circuit 8, after decoding, become simulating signal through audio D/A converter 10 again, is amplified by audio-frequency power amplifier 11, drives loudspeaker (audio amplifier) pronunciation.

Respectively the embodiment of the each several part functional circuit structure of forming the utility model main frame acoustics circuit is described below in conjunction with Fig. 3～Fig. 7.

One, main control circuit part

As shown in Figure 3, the main control circuit 8 in the main frame acoustics circuit adopts the AT89C51SND1C chip of American ATMEL, and it is a chip at the new production of MP3 solution, should increase MP3 decoding module, I on the basis of 89C51 ²C/PCM audio frequency output module, serial-parallel interface module (USB, I ²C, SPI IDE) and other external memory interface module, is applicable to the MP3 player, automobile audio, embedded systems such as home theater.In Fig. 3 structure, the clock circuit of being made up of capacitor C 1, C2 and crystal X1 is connected with X1, the X2 of AT89C51SND1C respectively, for system provides work clock; Capacitor C 5, C6, C7, C8 are power filtering capacitor; Capacitor C 9 and AT89C51SND1C internal circuit are then formed electrify restoration circuit.USB1 is the external USB socket; its D+ is connected with D+, the D-of AT89C51SND1C respectively with D-; USBVDD connects the special-purpose feed circuit of USB; R39, R40, R51 are the holding circuits of USB mouth; by the USB circuit; AT89C51SND1C can read the mp3 file of outside " U " dish, realizes the broadcast to MP3 audio frequency in " U " dish.File system is supported the FAT16/FAT32 subregion, discerns the FAT16/FAT32 subregion automatically.Button K0-K6 and AT89C51SND1C connect to form keyboard circuit, realize various feature operations.VOL+ and VOL-carry out 31 grades of volumes to be regulated.MODE and VOL, VOL-cooperate can carry out the switch of left and right acoustic channels balance adjustment, bass, middle pitch and high pitch gain-adjusted, bass audio enhancement function, the operations such as selection, document copying and file movement of interior external storage.STOP, FFW, REW and PLAY/PAUSE button carry out play operation, can play, suspend, stop, F.F., fall soon, feature operations such as a last song and next song.Display screen adopts 12232F Chinese character dot matrix Liquid Crystal Module, one screen can show 2 * 7.5 Chinese characters, with ST7920 is master controller, inner integrated 8192 Chinese character dot matrix type matrixes, be used for showing the filename of work at present state, broadcast, the supplementary of folder information reproduction time, file and button operation prompting etc.JP4LCDPORT is the LCD modular jack, and LVR is a semifixed resistor, the contrast that can regulate LCD.

Two, memory circuitry part

The storer of this main frame acoustics circuit has two, one is the FLASH flash chip K9F5608 (Fig. 4) of Samsung, the storage space that 32M * 8Bit is arranged, this chip outage back canned data can not lost, be used for accumulator system configuration information, state plays and tens first audio files, can delete the audio file of storage through keyboard operation, also can be from outside " U " dish copied files, file system FAT16 subregion.Another is the CMOS sram chip HY62WT08081E (Fig. 5) of Hynix company, as the data-carrier store of AT89C51SND1C, and the ephemeral data of store M P3 decoding and system operation.U5A and U5B can be respectively two chips and produce chip selection signal among the figure.

Three, audio A/D transducer and audio-frequency power amplifier part

The circuit structure of audio A/D transducer 10 and audio-frequency power amplifier 11 as shown in Figure 6.Its sound intermediate frequency D/A transducer 10 adopts the CS4330 chip of Cirrus Logic company, it is a serial line interface stereo audio D/A transducer, its dynamic range reaches 94dB, employing+3.3V single power supply, DOUT, DCLK, DSEL and SCLK are connected with the corresponding pin of AT89C51SND1C respectively among the figure, the MP3 audio file that is different rates is through decoded serial data output terminal, and output terminals A OL is connected the input end of audio-frequency power amplifier 11 with the sound signal of AOR output.Audio-frequency power amplifier 11 adopts the TDA7386 chip of company of STMicw Electronics (ST), and it has the fan-out capability of maximum 4 * 45W, powers with single supply 14.4V.C3, C4, C5 and C6 are the input partiting dc capacitor among the figure, C8 and C10 are power filtering capacitor, the internal circuit of C1, C2 and TDA7386 is formed the output delay circuit that powers on, and loudspeaker produces impact sound when preventing power-on, and C7 and C9 then are the internal circuit filter capacitor of TDA7386.Audio-frequency power amplifier 11 is quadraphonic output, 45 watts of every sound channels, and internal system is installed two loudspeakers, uses two sound channels (SPK1 and SPK3), and two sound channels (SPK2 and SPK4) are connected to the external speakers accessory power outlet in addition, for connecting two external voice boxes.

Four, power circuit part

Circuit construction of electric power as shown in Figure 7.The power supply of employing alternating current 220V, the 220V power supply is connected to power transformer B through power switch K8 and protective tube FUSE, power transformer output 12V AC power is formed the current rectifying and wave filtering circuit circuit by D1, C21 and C20, and output 12V direct supply gives audio-frequency power amplifier 11 power supplies.Because automobile provides the 12V direct supply, the 220V power supply can omit. W1, C22 and C23 composition+5V mu balanced circuit among the figure, output+the 5V power supply connects USBVDD, is that the USB device of outside is powered; W2, C24 and C25 composition+3V mu balanced circuit, output+the 3V power supply connects the power end of chips such as AT89C51SND1C, K9F5608, HY62WT08081E and CS4330, is these chip power supplies; R21 and L1 power indicating circuit, L1 lighted when system power-up was opened.

Need to prove that total system of the present utility model is to work under the software control in embedded system, the software of identical function, implementation method has difference, but this does not influence the operate as normal of system.

Claims

1. a vehicle-mounted Chinese display digital acoustics player is characterized in that by host shell (1) and is located at the inner main frame acoustics circuit of host shell (1) forming, wherein

1.1, host shell panel (2) is provided with matrix liquid-crystal display screen (3), function key group (4), USB interface (5), power switch (6) and audio input interface (7);

1.2, be located at the interior main frame acoustics circuit of host shell (1) by main control circuit (8), dual-memory circuit (9), audio A/D transducer (10), audio-frequency power amplifier (11), liquid crystal display drive circuit (12), matrix liquid-crystal display screen (3) and power circuit (13) are formed, the power amplifier control output end of main control circuit (8) is connected to the input end of audio-frequency power amplifier (11) through audio A/D transducer (10), the I/O end of dual-memory circuit (9) connects with the dual-memory output/input end of main control circuit (8), and the input end of liquid crystal display drive circuit (12) and output terminal connect with the liquid crystal display output terminal of main control circuit (8) and the input end of matrix liquid-crystal display screen (3) respectively.

2. vehicle-mounted Chinese display digital acoustics player according to claim 1 is characterized in that USB interface (5) is wired connection or wireless connections, and can be as the interface of other agreement.

3. vehicle-mounted Chinese display digital acoustics player according to claim 1 is characterized in that audio input interface (7) is wired connection or wireless connections.

4. vehicle-mounted Chinese display digital acoustics player according to claim 1, it is characterized in that the main frame acoustics circuit connects " U " dish or storage card work by USB interface (5), and by matrix liquid-crystal display screen (3) in the USB flash disk, foreign language song title shown.