CN1434572A - Portable wireles MP3 receiving player - Google Patents
Portable wireles MP3 receiving player Download PDFInfo
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- CN1434572A CN1434572A CN 02100748 CN02100748A CN1434572A CN 1434572 A CN1434572 A CN 1434572A CN 02100748 CN02100748 CN 02100748 CN 02100748 A CN02100748 A CN 02100748A CN 1434572 A CN1434572 A CN 1434572A
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Abstract
A portable wireless MP3 receive player is composed of circuits of power control, FM high frequency head, DARC signal decode, MP3 decode, storage, digit/analog conversion, voice play, liquid crystal display, in which, the power circuit can convert the power to the player needed voltage. FM high frequency head receives FM signal to demodulate wireless transmitted MP3 data by DARC, MP3 decode circuit, then to change it to analog audio signal by digit/analog conversion circuit played out by earphone. MP3 data can be stored in memory, 64MP3 music at the most. The player has the function of serial communication to communicate the music to external equipment.
Description
The present invention relates to a kind of wireless data broadcasting receiving system, particularly a kind of portable wireles 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 young man 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 growth rate is up to 348%.
The market prospects 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 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.
Enlarge the consumer group of MP3 player, key is a difficult problem that solves wireless transmission 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, television broadcasting.Wireless data broadcasting is the new 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 f-m multiplex data broadcasting.It is a vacant part of utilizing the FM broadcasting frequency spectrum, and just the subchannel of FM broadcasting is set up data channel and carried out point-to-point, point-to-area data broadcasting mode.Make traditional FM broadcasting 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 broadcasting 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, transport 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 International Telecommunications Union: 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 broadcasting mode that transmission capacity is big.
The objective of the invention is to: utilize the DARC technology, realize the function of MP3 player wireless receiving MP3 music, make the MP3 player be not limited to computer, be convenient to user's use, as listening to the radio wireless receiving MP3 music and playing by wired mode down-load music.In traveling automobile, also can wirelessly listen to the MP3 music.It is reached:
1, when the FM subchannel transmits the DARC signal, do not hinder the transmission of stereophonic signal, realize the transmission 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 broadcasting, does not influence original broadcast operation fully.
3, wide coverage, service range is wide.The coverage of FM broadcasting is exactly the service range of native system, because its transmission is digital signal, very strong error protection is arranged.
4, can download first song more than 120 every day for mobile recipient transmits abundant MP3 music.
The objective of the invention is to be achieved through the following technical solutions: portable wireles 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 direct voltage of this machine to the 1.5-3v voltage from battery; FM tuner signal input part links to each other with antenna; The data wire (DATA1) of CPU (CPU), Writing/Reading control line (WR/RD), 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/address bus of CPU (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 (RAM).The data wire 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 wire (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 Receiving (RXD) is held the serial line interface that is connected to external equipment, can give external equipment the MP3 transfer of data of wireless receiving by serial communication mode.
Advantage of the present invention is:
1, transmission 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 broadcasting subchannel technology, the every place that can receive in FM broadcasting 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 that travels.
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 voice signal as FM receiver, and does not need the manufal 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 powered battery of a joint or two joint 1.5v.
8. can store 64 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 liquid crystal display 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 palmtop PC, notebook computer, desktop computer, 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 a principle of the invention block diagram.
Fig. 2, Fig. 3 are circuit theory diagrams of the present invention.
Symbol description is as follows among the figure:
IC1-FM reception module OM5610
IC2-CPU (CPU) 89C51
IC3-data wireless radio channel (DARC) signal decoding chip MSM9563
IC4-2G bit flash memory chip K9K2G08Q0M-YCB0
IC5-power management chip MAX1677
IC6-MP3 decoding chip MAS3507D
IC7-digital-to-analog conversion chip DAC3550A
IC8-3-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 OM5610, it needs two kinds of supply voltages: a kind of is 3.3V, groundwork voltage as module, a kind of is the voltage of 12V, the tuning voltage during as frequency sweep.The receive frequency range of OM5610 is 87-108MHz.Antenna can adopt built-in aerial.Data wire (DATA) links to each other with the P1.1 mouth of CPU (CPU) 89C51, Tuning Control line (TUNE) links to each other with the P1.2 of CPU (CPU), clock (CLK) links to each other with the P1.0 of CPU (CPU), and Writing/Reading control line (WR/RD) links to each other with the P1.3 of CPU (CPU).
CPU (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 wire (DATA), command word or data are write OM5610, or data are read in the internal memory of CPU (CPU) from OM5610.CPU (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 CPU (CPU) appointment has the function that electronics receives surely frequently; CPU (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 CPU (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.
CPU (CPU) is selected 89C51 for use, 8 single-chip microcomputers.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 wire.
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 address wire of MSM9563.
The P1.5-P1.7 I/O (I/O) of a 89C51 mouthful line links to each other with the input 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; Output Y4 links to each other with the sheet selected control system holding wire CS3 of LCD (LCD).
The INT0 of 89C51 links to each other with the interruption controls line INT of MSM9563, when MSM9563 has finished certain function, can produce interrupt signal automatically, carries out corresponding routine processes by interruption controls line notice CPU (CPU).
The control (RD) of reading of 89C51 links to each other with the control (RD) of reading of MSM9563, K9K2G08Q0M-YCB0 (IC4), and by data wire and address wire, reads the data message of these chip-stored respectively.
The control (WR) of writing of 89C51 links to each other with the control (WR) of writing of MSM9563, K9K2G08Q0M-YCB0 (IC4), and by data wire and address 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 equipment, can finish the data communication between this wireles MP 3 receiving player and the external equipment, when the user needs, can give external equipment the MP3 music data transmissions of wireless receiving in the wireles MP 3 receiving player and storage, as notebook computer 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 CPU (CPU), finish the demodulation sign indicating number work of DARC signal, and the data message that decodes, pass to CPU (CPU) by data wire, pass to flash memory K9K2G08Q0M-YCB0 (IC4), data message is stored by CPU (CPU).K9K2G08Q0M-YCB0 has 256M * 8 bytes of memory spaces, and a slice K9K2G08Q0M-YCB0 can store 64 first MP3 music datas.
The MP3 decoding circuit is selected MAS3507D for use, by address wire A0-A7, data wire D0-D7 links to each other with CPU (CPU), under the control of CPU (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, (Headphone) plays back by earphone.
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 to the background information of 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.
Electric power management circuit is selected chip MAX1677 for use, from the battery of outside 1.5-3v, produces the two-way supply voltage: the one tunnel is 3.3v, as the main supply power voltage of this wireles MP 3 receiving player; Another road 12v mainly is used as the tuning direct voltage of FM tuner.Except powered battery, also can accept the supply voltage of external 1.5-4.5v by socket JP2, to save the use of battery.
The course of work of portable wireles MP 3 receiving player of the present invention is: CPU (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.Demodulation sign indicating number process through decoding chip inside decodes 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 64 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.
Claims (5)
1. a portable wireles MP 3 receiving player by name 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.It is characterized in that: power circuit can be converted to the required two-way direct voltage of this machine to the 1.5--3V voltage from battery; FM tuner signal input part links to each other with antenna; The data wire (DATA1) of CPU (CPU), Writing/Reading control line (WR/RD), 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/address bus of CPU (CPU) (DATA BUS), address bus (ADDRE8S 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 (RAM).The data/address 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 wire (DATA2), pass to the D/A switch circuit, the analoging sound signal that reduction can be heard for people's ear plays back by earphone at last.The relevant knowledge that can show the MP3 music by LCDs.The data of CPU send (TXD) and Data Receiving (RXD) is held the serial line interface that is connected to external equipment, can give external equipment the MP3 transfer of data of wireless receiving by serial communication mode.
2. portable wireles MP 3 receiving player according to claim 1 is characterized in that: by the button setting, and alternative storage 64 first MP3 music.
3. portable wireles MP 3 receiving player according to claim 1 is characterized in that: have liquid crystal display, can show the related content such as title, time of in progress MP3 music.
4. portable wireles MP 3 receiving player according to claim 1 is characterized in that: the receive frequency range of this receiver is 87-108MHZ.
5. portable wireles MP 3 receiving player according to claim 1 is characterized in that: the antenna of this receiver is a built-in aerial.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02100748 CN1434572A (en) | 2002-01-23 | 2002-01-23 | Portable wireles MP3 receiving player |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02100748 CN1434572A (en) | 2002-01-23 | 2002-01-23 | Portable wireles MP3 receiving player |
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| Publication Number | Publication Date |
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| CN1434572A true CN1434572A (en) | 2003-08-06 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 02100748 Pending CN1434572A (en) | 2002-01-23 | 2002-01-23 | Portable wireles MP3 receiving player |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100448500C (en) * | 2005-02-01 | 2009-01-07 | 乐金电子（惠州）有限公司 | Game system using wireless MP3 player |
| CN1756100B (en) * | 2004-08-27 | 2010-12-08 | 索尼株式会社 | Radio communication system, radio communication device, and radio communication method |
-
2002
- 2002-01-23 CN CN 02100748 patent/CN1434572A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1756100B (en) * | 2004-08-27 | 2010-12-08 | 索尼株式会社 | Radio communication system, radio communication device, and radio communication method |
| CN100448500C (en) * | 2005-02-01 | 2009-01-07 | 乐金电子（惠州）有限公司 | Game system using wireless MP3 player |
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Addressee: Yang Shuhui Document name: Notification before expiration of term |
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| WD01 | Invention patent application deemed withdrawn after publication |