CN201191511Y - Desk type Chinese display digital acoustic - Google Patents

Abstract

The utility model relates to a table type Chinese character display digital sounder, which is composed of a host machine and a sound box, wherein a dot-matrix liquid crystal display, a functional key group, a USB port, a power supply switch and an audio input port are arranged on a panel of the host machine, and the host machine sound circuit arranged in the casing of the host machine is composed of a main control circuit, a double-storage circuit, an audio A/D converter, an audio power amplifier, a liquid crystal driving circuit, a dot-matrix liquid crystal display and a power supply. In operation, music signal output by the main control circuit is converted into analog signals via the audio A/D converter, and then is amplified by the audio power amplifier to drive the sound box to sound, simultaneously, and songs title information output by the main control circuit is displayed by the liquid crystal display after passing through the liquid crystal driving circuit. The utility model utilizes an integral design, can play all the music stored in a USB stick, such as music of MP3, Ipod and the like and display song titles with Chinese or foreign languages simultaneously, can make sufficient use of the internet to obtain music freely, and meets requirements of domestics and medium or small sized establishments.

Description

Desk-top Chinese display digital acoustics

Technical field

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

Background technology

Desk-top tone playing equipment well known in the art mainly contains tape recorder and reproducer, CD cassette player and DVD cassette player etc. at present, and it exists subject matter to be: 1. actual listening with user's needs in the process constantly bought tape or CD, with the update playing content; 2. product structure non-integral design needs own combined system in the use, this just requires the user will have certain professional knowledge; 3. existing CD cassette player and the DVD cassette player that can play MP3 music in " U " dish in all can not showing, the foreign language title of the song, is not easy to the user and selects song; 4. the anti-seismic performance of equipment is not good.Up to now, can play-over music such as MP3, Ipod and show in, the desk-top Chinese display digital acoustics of foreign language title of the song also is not seen in report as yet in this area.

The utility model content

The purpose of this utility model is the problem at the existence of this area aforementioned background art, adopt current popular MP3, Ipod technology and use embedded system, and then design a kind of can be used for playing music such as MP3, Ipod and can directly demonstrate in, the desk-top Chinese display digital acoustics of foreign language title of the song, 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 desk-top Chinese display digital acoustics that is provided is made up of host shell, audio amplifier and the main frame acoustics circuit that 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, the main frame acoustics circuit that is located in the host shell is made up of governor circuit, two memory circuit, audio A/D transducer, audio-frequency power amplifier, liquid crystal display drive circuit, matrix liquid-crystal display screen and power circuit, the power amplifier control output end of governor circuit is connected to the input end of audio-frequency power amplifier through audio A/D transducer, the I/O end of two memory circuits connects with the storage 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 governor circuit and the input end of matrix liquid-crystal display screen respectively.In the work, the music signal of being exported by governor 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 governor circuit output.

Compared with prior art, desk-top Chinese display digital acoustics described in the utility model has the following advantages: have music, song source widely 1., compare existing equipment products such as tape recorder and reproducer, 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. can show China and foreign countries' title of the song by LCDs, 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. product has structurally been done integrated design, need not oneself and does combining and configuring again; 5. data message is by semiconductor storage, and volume is little, capacity is big, easily preservation, can satisfy family and medium and small management place needs, has vast market prospect in the sound applications field.

Description of drawings

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

Fig. 2 is the theory diagram of the main frame acoustics circuit of this desk-top Chinese display digital acoustics.

Fig. 3～Fig. 7 is the circuit theory diagrams of an embodiment of this desk-top Chinese display digital acoustics main frame acoustics circuit, wherein Fig. 3 is the circuit theory diagrams of governor 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, desk-top Chinese display digital acoustics described in the utility model mainly is made up of main frame and audio amplifier 2 two parts, and main frame comprises housing 1 and the main frame acoustics circuit that is arranged in the housing 1.The host shell panel 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 housing multiple styles such as " cartoon type ", " Greco-Roman Style ", " fashion formula " according to design concept during production.Foreign language title of the song, radio reception frequency and menu 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, but also wireless link of USB interface.Power switch 6 is used for switching on and shutting down.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 desk-top digital acoustics as walkman, MP3, Ipod, radio 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 governor circuit 8, two memory circuits 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 governor 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 two memory circuits 9 connects with the storage output/input end of governor circuit 8, the input end of liquid crystal display drive circuit 12 and output terminal connect with the liquid crystal display output terminal of governor circuit 8 and the input end of matrix liquid-crystal display screen 3 respectively, and power circuit 13 provides power supply for each circuit.During work, the main frame internal circuit reads the music signal of storage in " U " dish under the control of governor 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.When making audio amplifier, its power and impedance will be mated with power amplifier, and optional finished product audio amplifier substitutes.

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 governor 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.JP4 LCDPORT is the LCD modular jack, and LVR is a semifixed resistor, the contrast that can regulate LCD.

Two, memory circuitry part

The memory circuitry of this main frame acoustics circuit has two, wherein memory circuitry I 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; Memory circuitry II 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.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.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 (4)

1, a kind of desk-top Chinese display digital acoustics is characterized in that by host shell (1), audio amplifier (2) and is located at the inner main frame acoustics circuit of host shell (1) forming, wherein

1.1 the host shell panel 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 governor circuit (8), two memory circuits (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 governor 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 two memory circuits (9) connects with two storage output/input ends of governor 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 governor circuit (8) and the input end of matrix liquid-crystal display screen (3) respectively.

2, desk-top Chinese display digital acoustics according to claim 1 is characterized in that USB interface (5) is wired connection or wireless connections.

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

4, desk-top Chinese display digital acoustics according to claim 1 is characterized in that the main frame acoustics circuit connects the work of " U " dish by USB interface (5), and by matrix liquid-crystal display screen (3) song title in the USB flash disk is shown.

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