CN2752857Y

CN2752857Y - Vehicular MP3 player

Info

Publication number: CN2752857Y
Application number: CN 200420086375
Authority: CN
Inventors: 何根洪
Original assignee: Individual
Current assignee: Individual
Priority date: 2004-12-15
Filing date: 2004-12-15
Publication date: 2006-01-18
Anticipated expiration: 2014-12-15

Abstract

The utility model relates to a vehicle MP3 player, which is provided with a casing and a storage card programmer with a plug-in type storage card, wherein the casing can be arranged inside a driver's cab of a vehicle and a playing mainframe circuit is arranged inside the casing; a mainframe board is provided with a liquid display screen, a storage card slot, a UBS interface, function selecting keys, etc.; the playing mainframe circuit arranged inside the casing is composed of a mainframe control circuit, an AM radio circuit, a memory, a D/A conversion circuit and a power amplification circuit; the storage card slot is arranged on a casing of the storage card programmer. The utility model not only can play songs and music stored in the storage card and a U-disk, but also is convenient for downloading the songs and music from internet, so that music resources on internet are effectively utilized and the need of most users to listen to the high-grade music is satisfied to the full extent.

Description

The vehicle mounted MP 3 player

Technical field

The utility model belongs to the tone playing equipment technical field, relates to a kind of automobile-used tone playing equipment of the MP3 of adding data layout music system.

Background technology

Vehicle-mounted tone playing equipment well known in the art mainly contains radio, cassette tape formula radio cassette player, CD player and VCD machine at present, or the composite set of these several functions, they in actual use the problem of corresponding existence comprise: play that tonequality is not high, the storage medium volume big, Heavy Weight, up-to-date song (music) band or CD is difficult for buying and can't utilize the internet to obtain a large amount of songs and music etc., in today of network information technology high-speed development, existing vehicle-mounted tone playing equipment obviously has been difficult to satisfy the higher demand of people to the playback aspect.In recent years, MP3 (MPEG Audio Layer 3) technology is equal to the high tone quality of CD and all can conveniently downloads outstanding advantages such as audio files from network and CD disc record with it, be widely used on information such as mobile phone, walkman and the amusing products, but but also do not had the steam supply car that the MP3 player that is provided with is installed at present.

The utility model content

The purpose of this utility model is the problem that exists at this area aforementioned background art, adopt current popular MP3 technology that existing MP3 player is transformed, so provide a kind of novel structure, easy to use, can effectively utilize the online music resource and greatly degree satisfy the vehicle mounted MP 3 player that demand is listened in the high-quality broadcast of user.

Be used for realizing that the technical solution of foregoing invention purpose is such: the vehicle mounted MP 3 player that is provided have one can be installed in automobile cab in be provided with the housing of playing host circuit and the storage card keymake of a band plug-in storage card, on case panel, be provided with LCDs (LCD), the storage card slot, the UBS interface, switch key and function selecting key group, be located at the interior broadcast host circuit of housing by the host computer control circuit, FMAM radio reception circuit, storer, D/A switch circuit and power amplification circuit are formed, wherein the I/O end of FMAM radio reception circuit and storer export accordingly with the host computer control circuit respectively/input end connects, the power amplifier control output end of host computer control circuit is connected to the input end of power amplification circuit through the D/A switch circuit, and storage card keymake housing is provided with the storage card slot.

Design solution of the present utility model is obtained by prior art rationally transforms, it has increased power amplification circuit, amplitude modulation radio reception circuit, storage card keymake etc. on the circuit base of miniature MP3 player, storage card slot and UBS interface are set on case panel, change the storage card in the former MP3 player into the plug type structure by stationary structure, made things convenient for the user to write storage card and utilize existing USB flash disk better; In addition, enlarge former MP3 player liquid crystal display screen dimensions, and, make MP3 broadcast and radio station frequency show shared same LCDs, reach suitable automobile-used purpose by changing the software programming on the central processing unit on the circuit board.

1., have widely music, song source compared with prior art, the advantage that vehicle mounted MP 3 player described in the utility model has is:, compare cassette recorder, CD player and VCD machine, obtaining of MP3 music file be the most convenient, extensively; 2., product all electronic design, do not have any mechanical wear and have good seismic resistance, durable, be particularly suitable for vehicle-mountedly, and audio tape and CD be because its inevitable mechanical wear, serviceable life is all shorter; 3., can adopt multiple play mode, as selecting played in order, single circulation, many Qu Xunhuan, whole broadcast forms such as circulations, also can select play sound effect, and can be presented at the sequence of broadcasting song and time etc. by display screen; 4., can record fast; 5., solved the contradiction that existing miniature MP3 player volume is little, volume is little, power supply does not match, memory is fixedlyed connected with main frame, realized that can both carry out music song to memory in any place of surfing the Net downloads, and makes automobile become a reality from illusion with MP3 player practicability.

Description of drawings

Fig. 1 is an appearance structure synoptic diagram of the present utility model.

Fig. 2 is the theory diagram of this player host circuit.

Fig. 3～Fig. 5 is the on line figure of an embodiment of this player host computer control circuit, and wherein Fig. 3 is the on line figure of host computer control circuit and memory circuitry, and Fig. 4 is the on line figure of D/A switch circuit and power amplification circuit, and Fig. 5 is the on line figure of power-supply circuit.

Embodiment

Referring to accompanying drawing, vehicle mounted MP 3 player described in the utility model is mainly formed by playing main frame and storage card keymake two parts.Main frame comprises housing 1 and the panel that is built-in with the broadcast host circuit, is provided with LCDs (LCD) 2, storage card slot 5, UBS interface 6, switch key 3 and function selecting key group 4 on panel.Host shell 1 is fixedly mounted on the preceding dial plate platform of automobile cab, and external form designs and produces by automobile industry GB dimensional requirement.Set LCDs 2 is put the display screen of the menu and the lyrics for display of broadcast radio station receive frequency and MP3 machine sowing respectively on the case panel, and its Presentation Function is finished under software control.Storage card slot 5 is used to make the storage card 11 that contains music and song to link to each other with the broadcast host circuit on the main frame, thereby forms a complete Play System, plays for MP3.UBS interface 6 can make automobile specified MP3 player connect with USB flash disk, with convenient music and the song content that stores in the USB flash disk of playing.Switch key 3 is used to control the break-make of MP3 player power supply, the control of selected songs etc. when channel selection when function selecting key group 4 is used for radio reception, volume and MP3 play.Power lead 7 is received on direct current 12 overhead accumulators of automobile, is the power supply of MP3 player.The storage card keymake is made up of with the storage card slot 9 and the UBS plug 10 that are located on the housing 8 the interior housing 8 of establishing control circuit board, its effect is that the storage card keymake is connected with the microcomputer of online by the UBS interface, the song downloaded from the internet and music data are write by certain format to be inserted in the memory slot 9, the storage card 11 that writes music, song like this can insert on the MP3 main frame at any time and play just as record has the tape of music, song.In concrete the enforcement, above-mentioned every function of storage card keymake can realize by the integrated circuit of a class such as AT89C51SND1, also the memory keymake can be designed to the common MP3 player of a band card insert type; Storage card then preferably utilizes the existing storage card in market, is the storage card of 128M or has more jumbo storage card as capacity.

The host circuit structure of vehicle mounted MP 3 player described in the utility model and principle of work are as shown in Figure 2, it is made up of host computer control circuit 13, FMAM radio reception circuit 14, storer 15, D/A switch circuit 16 and power amplification circuit 17, wherein the I/O end of FMAM radio reception circuit 14 and storer 15 respectively with host computer control circuit 13 accordingly output/input end connect, the power amplifier control output end of host computer control circuit 13 is connected to the input end of power amplification circuit 17 through D/A switch circuit 16.In the real work, when user's energized and after pressing play button, host computer control circuit 13 at first detects push button signalling, then from storage card, read the compressed signal of music or song by storer 15 according to broadcast request, after decoding, send D/A switch circuit 16 to be reduced to simulated audio signal, by power amplification circuit 17 analogue audio frequency is amplified the pronunciation of low-pass filtering rear drive loudspeaker again; Meanwhile, host computer control circuit 13 is delivered to the LCD display controller with the music or the song data that read after translation, show corresponding literal by LCDs 2; When reading music, song data by UBS interface 6, except that from the channel difference of storage card reading of data, other process is with last consistent; In addition after other function key 4 was pressed, the principle of work of MP3 player was also with last similar.When the user answered radio, the frequency of radio station that amplitude modulation radio reception circuit 14 receives was delivered to the LCD display controller by host computer control circuit 13, drove LCDs 2 and showed corresponding frequency numerical value.In addition, also can in playing host circuit, CD, VCD or DVD functional circuit be set in concrete the enforcement.Label 12 is a power-supply circuit among Fig. 2.

In actual circuit structure of the present utility model (referring to Fig. 3～Fig. 5), it is the integrated circuit (IC) chip of AT89C51SND1 that host computer control circuit 13 adopts model, it concentrates central processor (CPU) and demoder is one, the The whole control program of operation MP3, be also referred to as fireware, the work of each parts of control MP3, and it can drive LCDs 2, and its supply voltage is 3.3 volts of direct currents; Storer 15 is piths of MP3 player, this machine adopts semiconductor memory (FLASHMEMORY) K9F2080UOA, adopt four signal wires of P5.0～P5.3 to make R/RC, CLE, ALE and the CE signal of FLASH chip in the circuit, P0 as with the exchanges data mouth of FLASH, WR, RD signal are as the read-write of FLASH; D/A switch circuit 16 in the player adopts CS4330A device (18 bit D/A conversion chip), it is the Earphone Amplifier chip of TDA7482 that power amplification circuit 17 adopts model, the decoded digital audio and video signals of MP3 decoding device becomes simulating signal by CS4330A, this signal is amplified by amplifier chip LM358 again, promote earphone, and then discerned by people's ear; Amplitude modulation radio reception circuit 14 is made up of FM/AM radio chip CXA1019 and interlock circuit, send into CXA1019 from the signal of antenna input through after the bandpass filter, be reduced to sound signal after amplifying through mixing, frequency discrimination, stereo decoding, audio frequency, on LCD, show carrier frequency value, time and work as foreground number etc. through Single-chip Controlling simultaneously; Power-supply circuit 18 adopts the MAX1677 chip, this circuit is the DC-DC translation circuit, and it is input as 12 volts of voltages of automobile storage battery, and output terminal output is through 12 volts of DC voltage of voltage stabilizing, supply with power amplifier, other provides other circuit of 3.3 volts of DC voltage MP3 players.

Claims

1, a kind of vehicle mounted MP 3 player, it is characterized in that having one can be installed in the automobile cab in be provided with housing (1) and storage card keymake of being with plug-in storage card (11) of playing host circuit, wherein

1.1 on case panel, be provided with LCDs (2), storage card slot (5), UBS interface (6), switch key (3) and function selecting key group (4);

1.2 the broadcast host circuit of being located in the housing (1) is made up of host computer control circuit (13), FMAM radio reception circuit (14), storer (15), D/A switch circuit (16) and power amplification circuit (17), the I/O end of its FMAM radio reception circuit (14) and storer (15) connects with the corresponding output/input end of host computer control circuit (13) respectively, and the power amplifier control output end of host computer control circuit (13) is connected to the input end of power amplification circuit (17) through D/A switch circuit (16);

1.3 storage card keymake housing (8) is provided with storage card slot (9).