CN2530844Y

CN2530844Y - Vehicle-mounted wireless MP3 receiving playback

Info

Publication number: CN2530844Y
Application number: CN 02201078
Authority: CN
Inventors: 杨曙辉; 汪小明; 严继芳
Original assignee: Individual
Current assignee: Individual
Priority date: 2002-01-23
Filing date: 2002-01-23
Publication date: 2003-01-15
Anticipated expiration: 2012-01-23

Abstract

A vehicle mounted wireless MP3 receiving player mainly comprises circuits of a power supply management, an FM high frequency tuner, a DARC signal decoding, an MP3 decoding, a storing, a digital analog conversion, a sound playing, and a liquid crystal displaying, etc. The power supply of the automobile can be changed into a voltage which is required by the player via the power supply circuit. The frequency modulated signal is received by the FM high frequency tuner. The MP3 data which is in wireless transmission can be modulated via the DARC and the MP3 decoding circuits, and changed into analog audio signal via the digital analog conversion circuit, then is played by a loudspeaker. The MP3 data which is received in wireless way can also be stored in the storage. 128 MP3 songs can be stored at most. The utility model has serial communication function, and the music which is received in wireless way can be transmitted to the external connection equipments.

Description

Vehicle carried wireless MP 3 receiving player

The utility model relates to a kind of wireless data broadcasting receiving device, particularly a kind of vehicle carried wireless MP 3 receiving player.

Along with modern information technology development, emerging technology that some are relevant with network and new things are beginning to come into our life.Be accompanied by the propagation of computer network in these 2 years, the music of MP3 data format is popularized in network world just rapidly.Though have only the history in 2 years, today, people walked in the street corner, and what see that the youngster equips on one's body no longer is traditional Walkman and discman, but dapper MP3 player.The digital music amusement equipment of this fashion increase its marketing scale just rapidly, and beginning is initiated challenge to traditional Walkman and discman market.According to the investigation of IDC, calendar year 2001 MP3 world market reaches 1,200,000,000 dollars.By 2005, the sales volume of the hand-held MP3 player in the whole world can be increased to 1,570 ten thousand ones from 3,500,000 ones of calendar year 2001, and rate of rise is up to 348%.

The market outlook of MP3 player are fine, but compared with the achievement that can sell 3,000 ten thousand walkman in 1 year in Chinese market, the sale of the MP3 player of 1 year hundreds of thousands of platform is felt dwarfed really.MP3 will reach considerable market sale, is still waiting time.The bottleneck that present restriction people consume MP3 mainly contains two aspects: the one, and on the high side; The 2nd, present MP3 player can only be downloaded music from the Internet, and this is its maximum shortcoming.Though the online advantage that is loaded with free selected songs down, because the limitation of domestic network overall situation, the speed of user's down-load music is very slow, adds that common MP3 can only store the first song of 8-16, and this just greatly reduces people's use enthusiasm.And owing to can only make in auto audio equipment, to be difficult to increase the MP3 player from network by wired mode down-load music.And the customer volume of auto audio equipment is huge, and who can solve this difficult problem, and who just will win huge customer group.

Making increases the MP3 player in the auto audio equipment, key is a difficult problem that solves transmission over radio MP3 music.Present wireless data transmission network mainly contains cellular network and pager net.But because the data volume of MP3 music is huge, transmitting with cellular network and pager net, cost an arm and a leg, is that institute of domestic consumer is unacceptable.Optimal mode is to adopt datacasting, and is convenient as listening to the radio.

Data broadcasting is the third broadcast type after sound radio, telecast.Wireless data broadcasting is the up-to-date technology of developing on traditional sound radio basis, in sound radio, carries out wirelessly transmitting data.Mainly contain two kinds of forms: a kind of is to utilize amplitude modulation (AM) broadcasting, and another kind is to utilize frequency modulation (FM) broadcasting, also claims the broadcasting of f-m multiplex data.It is a vacant part of utilizing the FM broadcast frequency spectrum, and just the subchannel of FM broadcast is set up data channel and carried out point-to-point, point-to-area data broadcast mode.Make traditional FM broadcast that only has sound radio to have the ability of wireless data broadcasting, existing stereophonic signal has data-signal again, is suitable for the transmission of literal, figure and intelligence data.The technology of utilizing the FM broadcast subchannel to carry out data broadcasting has several, and is extensive in the countries use of prosperity.For example the U.S., Germany, Japan, Sweden etc. have all founded the f-m multiplex data broadcast service, can provide various information for the user, comprising: news, weather forecast, traffic information, sports tournament, financial market, tourist shopping etc.

(DAta Radio Channel DARC), is called for short the DARC technology to the data wireless radio channel, is the f-m multiplex high-speed datacasting technology of NHK (NHK) exploitation.DARC is the trade mark of NHK (NHK) for this technology registration, is recommended as international standard in nineteen ninety-five through Union Internationale des Telecommunications: Rec.ITU-RBS.1194.Modulation system and coding structure that the DARC technology adopts, in numerous datacastings, belong to not only be suitable for fixingly receiving, but also be suitable for moving receive, a kind of data broadcast mode that transmission capacity is big.

The purpose of this utility model is: utilize the DARC technology, give in the existing auto audio equipment and install wireles MP 3 receiving player additional, making can the wireless MP3 of listening to music in traveling automobile.Expanded the application of MP3 player, for user vehicle has brought the more music source of horn of plenty.It is reached:

1, when the FM subchannel transmits the DARC signal, do not hinder the transmission of stereophonic signal, realize the transmission over radio of MP3 music data.

2, make full use of existing resource.In channel resource extremely limited today, native system does not need to apply for independent frequency again, need not pay the frequency occupancy, just utilizes the subchannel of FM broadcast, does not influence original broadcast operation fully.

3, wide coverage, service range is wide.The coverage of FM broadcast is exactly the service range of native system, because its transmission is digital signal, very strong error protection is arranged.

4, mobile accepter such as the abundant MP3 music of user vehicle transmission can be, about more than 120 first songs can be downloaded every day.

The purpose of this utility model is achieved through the following technical solutions: vehicle carried wireless MP 3 receiving player mainly is made of circuit such as power management, frequency modulation (FM) tuner, DARC signal decoding, MP3 decoding, storage, D/A switch, sound playing, liquid crystal displays.Power circuit can be converted to the required two-way vdc of this machine to the 12V voltage from automobile power source; FM tuner signal input part links to each other with antenna; The data line (DATA1) of central processing unit (CPU), read/write control line (RD/WR1), tuning control input end (TUNE) link to each other with tuner respectively; Under the control of CPU, tuner energy automatic tuning frequency of radio station is realized frequently fixed or frequency sweep receives frequency modulation (FM) signal with DARC signal; The data bus of central processing unit (CPU) (DATA BUS), address bus (ADDRESS BUS), control line (/INT), chip select line (/CS1), outside output control line (/XOUTC) link to each other with the DARC signal decoding circuit respectively, control DARC signal decoding circuit demodulates the data-signal that is included in the FM signal, and the data-signal that this machine receives is the MP3 music data.Under the control of CPU, the MP3 music data that demodulates can store in the memory device (RAM).The data line of CPU (DATA2) links to each other with the MP3 signal decoding circuit with request control line (REQ), give the MP3 signal decoding circuit MP3 music data transmissions of wireless receiving, synthesize digital audio and video signals by it, again by data line (DATA3), pass to the D/A switch circuit, the analoging sound signal that reduction can be heard for people's ear plays back by loud speaker or earphone at last.The relevant knowledge that can show the MP3 music by LCDs.The data of CPU send (TXD) and data sink (RXD) is held the serial interface that is connected to external equipment, can give external equipment the MP3 data transmission of wireless receiving by serial communication mode.

The utility model has the advantages that:

1, transfer rate is big.Normal rate is 16Kbit/s, adopts SuperDARC, and effective data rate is 64Kbit/s.

2, range of receiving is big.Because what adopt is FM broadcast subchannel technology, the every place that can receive in FM broadcast utilizes this receiver can listen to the MP3 music.

4, support to move reception.Receptivity is reliable, and is highly sensitive.The DARC technology is to receive exploitation at moving specially, adopts the receiver of present technique, can receive the MP3 music in the vehicle of fast running.

5, circuit is ingenious, and power consumption is little.This reception player adopts the components and parts of low-power consumption by ingenious design, when receiving, and the power saving receive mode that can take timesharing to receive.Auto Power On receives when MP3 music data information is arranged, and shuts down automatically when no information.

6, can decide frequency or frequency sweep receives.This reception player receives aud. snl. as FM receiver, and does not need the manual tuning frequency of radio station when receiving, and can carry out electronic tuning automatically, finds the frequency of radio station with DARC signal.If there are a plurality of radio station to send the DARC signal, the user can set the frequency of radio station of oneself liking.This reception player can be remembered this frequency, and automatically locks this frequency when using afterwards, changes frequency if desired, only need reset to get final product.

7, the power supply of this reception player adopts the power supply power supply of automotive interior.

8, owing to adopted automobile power source, thereby can adopt bulk memory, storage 32 first songs.

9, easy to use, easy operating.Have simple function key, be convenient to select the MP3 music listened to, be convenient to optionally store music.Have the large-screen lc Presentation Function, can show the diversity of settings knowledge of the MP3 music that is receiving or playing.

10, have the serial communication function, can link to each other with palm PC, notebook PC, Desktop PC, give other external equipment the MP3 music transmission of wireless receiving by the serial communication line.

Further describe below in conjunction with drawings and Examples:

Fig. 1 is the utility model block diagram.

Fig. 2, Fig. 3 are the utility model schematic circuit diagram.

Nomenclature is as follows among the figure:

IC1-FM reception module OM5610

IC2-central processing unit (CPU) 89C51

IC3-data wireless radio channel (DARC) signal decoding chip MSM9563

IC4, IC5-2G bit flash memory chip K9K2G08Q0M-YCB0

IC6-MP3 decoding chip MAS3507D

IC7-digital-to-analog conversion chip DAC3550A

IC8-12V mu balanced circuit LM7812CT

IC9-5V mu balanced circuit LM7805CT

IC10-voltage transitions chip MAS9128

IC11-3-eight decoder 74LS138

As Fig. 1, Fig. 2 and shown in Figure 3, circuit such as power management, FM tuner, DARC signal decoding, MP3 decoding, storage, D/A switch, sound playing, liquid crystal display constitute.The FM tuner receives from the aerial FM signal that has the DARC signal by antenna, that the FM tuner adopts is the tuning FM receiver module of small electrical 0M5610, it needs two kinds of power line voltages: a kind of is 3.3V, groundwork voltage as module, a kind of is the voltage of 12V, the VT during as frequency sweep.The receive frequency range of OM5610 is 87-108MHz.Antenna can directly adopt the radio aerial of automobile.Data line (DATA) links to each other with the P1.1 mouth of central processing unit (CPU) 89C51, automatic tuning control line (TUNE) links to each other with the P1.2 of central processing unit (CPU), clock (CLK) links to each other with the P1.0 of central processing unit (CPU), and Writing/Reading control line (WR/RD) links to each other with the P1.3 of central processing unit (CPU).

Central processing unit (CPU) produces the required clock signal of read-write OM5610 internal memory register by clock (CLK) line, by tuning control (TUNE) line, judges the state when OM5610 looks for platform automatically; The operation that the OM5610 internal register is read or write by Writing/Reading control line (WR/RD); By data line (DATA), command word or data are write OM5610, or data are read in the internal memory of central processing unit (CPU) from OM5610.Central processing unit (CPU) is by these modes, can write the OM5610 internal register to the pairing data message of the frequency of radio station that will look for, make tuner can carry out electronics and look for platform automatically, the radio station of locking central processing unit (CPU) appointment has the function that electronics receives surely frequently; Central processing unit (CPU) can judge whether the radio station of finding is desired radio station by the data that read the OM5610 internal register simultaneously.If not, by central processing unit (CPU) new frequency of radio station value is set, search for automatically, so can finish the function of automatic frequency sweep repeatedly, need not manual intervention.

Central processing unit (CPU) is selected 89C51 for use, 8 micro controller systems.By four I/O of P1.0-P1.3 (I/O) mouthful line of 89C51, finish control to tuner, achieve the function of looking for platform automatically.

The P0.0-P0.7 of 89C51, eight I/O (I/O) mouthful line links to each other with the D0-D7 of DARC decoding chip MSM9563, as data line.

The P2.0-P2.5 I/O (I/O) of a 89C51 mouthful line links to each other with the A0-A5 of MSM9563, as the A wire of MSM9563.

The P1.5-P1.7 I/O (I/O) of a 89C51 mouthful line links to each other with the input end of 3-eight decoder 74LS138, produces six kinds of output control signals.Wherein, the outside output control line of output signal Y0 and MSM9563 (/XOUTC) link to each other, whether control MSM9563 exports outside oscillator signal, can be for other circuit uses; Output Y1 links to each other with the removing control end (CLR) of MSM9563, as the control line of removing MSM9563 internal register data; Output Y2 and the sheet of MSM9563 select control end (/CS) link to each other, as the chip selection signal control line of MSM9563; Output Y3 selects control end (CS2) to link to each other with the sheet of flash memory K9K2G08Q0M-YCB0 (IC4), as the chip selection signal control line of flash memory K9K2G08Q0M-YCB0 (IC4); Output Y4 selects control end (CS3) to link to each other with the sheet of flash memory K9K2G08Q0M-YCB0 (IC4), as the chip selection signal control line of flash memory K9K2G08Q0M-YCB0 (IC5); Output Y5 links to each other with the sheet selected control system signal wire (SW) CS4 of Liquid Crystal Display (LCD) (LCD).

The INT0 of 89C51 links to each other with the interrupt control line INT of MSM9563, when MSM9563 has finished certain function, can produce interrupt signal automatically, carries out corresponding routine processes by interrupt control line notice central processing unit (CPU).

The control (RD) of reading of 89C51 links to each other with the control (RD) of reading of MSM9563, K9K2G08Q0M-YCB0 (IC4) and K9K2G08Q0M-YCB0 (IC5), and by data line and A wire, reads the data message of these chip-stored respectively.

The control (WR) of writing of 89C51 links to each other with the control (RD) of writing of MSM9563, K9K2G08Q0M-YCB0 (IC4) and K9K2G08Q0M-YCB0 (IC5), and by data line and A wire, respectively these chips is carried out the write operation of data message.

The serial port of 89C51 receives line (RXD), transmission line (TXD) links to each other with the serial port of external device, can finish the data communication between this wireles MP 3 receiving player and the external device, when customer requirement, can give external device the MP3 music data transmissions of wireless receiving in the wireles MP 3 receiving player and storage, as notebook PC etc.

The DARC signal decoding circuit is selected special-purpose DARC decoding chip MSM9563 for use, receive frequency modulation (FM) the subchannel signal of FM high frequency tuner circuit output by capacitive coupling, under the control of central processing unit (CPU), finish the demodulation sign indicating number work of DARC signal, and the data message that decodes, pass to central processing unit (CPU) by data line, pass to flash memory K9K2G08Q0M-YCB0 (IC4 and IC5), data message is stored by central processing unit (CPU).K9K2G08Q0M-YCB0 has 256MX8 bytes of memory space, and two K9K2G08Q0M-YCB0 can store 128 first MP3 music datas.

The MP3 decoding circuit is selected MAS3507D for use, by A wire A0-A7, data line D0-D7 links to each other with central processing unit (CPU), under the control of central processing unit (CPU), can pass to MAS3507D to the MP3 music data that is stored in the flash memory, finish the data decode of MP3 music by MAS3507D.

Decoded digital music signal is transferred to D/A conversion circuit DAC3550A chip by SOC, SOI and SOD serial output control line, finish the conversion of digital signal by DAC3550A to analog signal, produce analog music signals, play back by earphone (Headphone) and loud speaker (SPEAKER), can listen to for the user.

The T1 of 89C51 links to each other with SDA with the SCL of DAC3550A respectively with the T0 output control line, finishes the setting to the internal work state of DAC3550A.

16 position datawires (A0-A7D0-D7) of LCD link to each other with the P2.0-P2.7P0.0-P0.7 of 89C51, finish the demonstration work of the background information (as title, author, performance/executant etc.) to the MP3 music under the control of 89C51.

By setting, can realize functions such as reception, selection, broadcast and deletion to the MP3 music to three button K1, K2 and K3.

Power circuit is made up of LM7812CT, LM7805CT and MAS9128.Wherein LM7812CT is the 12V mu balanced circuit, and LM7805CT is the 5V mu balanced circuit, by linking to each other with the battery supply that carries in the automobile, produces the vdc of 12V and 5V respectively.MAS9128 is a power-switching circuit, can be converted to the 3.3V vdc to the 5V vdc of input, as the main power supply voltage of this wireles MP 3 receiving player.The 12V vdc mainly is used as the tuning vdc of FM tuner.

The working process of the utility model wireles MP 3 receiving player is: central processing unit (CPU) control FM high frequency tuner circuit, realize electronic automatic tuning, include frequency modulation (FM) signal of DARC signal by the antenna automatic reception, simultaneously the subchannel signal of tuner output is sent into the DARC decoding circuit.Through decoding chip in-to-in demodulation sign indicating number process, decode the MP3 data-signal that carries in the DARC signal.The MP3 data-signal that receives is stored in the flash memory automatically (can deposit 128 first songs).MP3 data by the MP3 decoding circuit can arrive wireless receiving decode digital music signal, by D/A conversion circuit, recover the analog music signals that can listen to again, play output by earphone or loud speaker.

Claims

1. vehicle carried wireless MP 3 receiving player, mainly constituted by circuit such as power management, frequency modulation (FM) tuner, DARC signal decoding, MP3 decoding, storage, D/A switch, sound playing, liquid crystal displays, it is characterized in that: be installed in the auto audio equipment, power circuit can be converted to the required two-way vdc of this machine to the voltage from automobile power source; FM tuner signal input part links to each other with antenna; The data line (DATA1) of central processing unit (CPU), read/write control line (RD/WR1), tuning control input end (TUNE) link to each other with tuner respectively; Under the control of CPU, tuner energy automatic tuning frequency of radio station is realized frequently fixed or frequency sweep receives frequency modulation (FM) signal with DARC signal; The data bus of central processing unit (CPU) (DATA BUS), address bus (ADDRESS BUS), control line (/INT), chip select line (/CS1), outside output control line (/XOUTC) link to each other with the DARC signal decoding circuit respectively, control DARC signal decoding circuit demodulates the data-signal that is included in the FM signal, and the data-signal that this machine receives is the MP3 music data.Under the control of CPU, the MP3 music data that demodulates can store in the memory device (RAM).The data bus of CPU (DATA BUS), address bus (ADDRESS BUS) link to each other with the MP3 signal decoding circuit, give the MP3 signal decoding circuit MP3 music data transmissions of wireless receiving, synthesize digital audio and video signals by it, again by data line (DATA2), pass to the D/A switch circuit, the analoging sound signal that reduction can be heard for people's ear plays back by loud speaker or earphone at last.The relevant knowledge that can show the MP3 music by LCDs.The data of CPU send (TXD) and data sink (RXD) is held the serial interface that is connected to external equipment, can give external equipment the MP3 data transmission of wireless receiving by serial communication mode.

2. vehicle carried wireless MP 3 receiving player according to claim 1 is characterized in that: by the button setting, and the complete MP3 music of alternative storage 128 head.

3. vehicle carried wireless MP 3 receiving player according to claim 1 is characterized in that: have the liquid crystal display of giant-screen, can show the related contents such as title, author, singer and time of in progress MP3 music.

4. vehicle carried wireless MP 3 receiving player according to claim 1 is characterized in that: the receive frequency range of this receiver is 87-108MHZ.

5. vehicle carried wireless MP 3 receiving player according to claim 1 is characterized in that: the external antenna of this receiver can directly adopt the external antenna of motorcar radio set.