CN201315166Y - Bus-type onboard audio player - Google Patents

Abstract

The utility model discloses a bus-type onboard audio player with a reliable operation. The bus-type onboard audio player comprises an audio processor as the core, wherein the input terminal of the processor is connected with an external U disc and IPOD to read and play the audio files in the U disc and the IPOD with the additional functions of pause, fast forward, fast backward and so on; a Bluetooth module is connected with the processor to achieve Bluetooth hand-free functions including incoming call, outgoing call, call in process, voice dialing, phonebook synchronization, and the like. The bus-type onboard audio player supports analog audio input, amplification and output functions, and can be hung on a vehicle bus to serve as a node of the vehicle bus for receiving commands from a vehicle gateway BSI to achieve the above functions. Profiting from the increasingly advanced semiconductor technique, the bus-type onboard audio player can substitute for the conventional CD player by using a U disc as the audio file carrier, and can also provide convenience for drivers in controlling the mobile phone in the Bluetooth hand-free manner so as to eliminate the trouble of incoming call and outgoing call during driving.

Description

A kind of bus type onboard audio player

Technical field

The utility model relates to a kind of audio player, specifically is a kind of bus type onboard audio player (USB_Box), can play the mobile audio file of numeral and analog format; By USB interface, can insert large capacity digital music storage and broadcast; By audio input interface, can insert analog audio stream and broadcast; By Bluetooth protocol, can insert the Bluetooth audio frequency Streaming Media; Can discern the iPOD of Apple, and play music wherein; By Bluetooth protocol, can realize the hand-free function of mobile phone; In addition, as a node of vehicle body network, also to safeguard the network function of himself by the CAN agreement.

Technical background

Vehicle electronics, particularly amusement equipment should constantly absorb the up-to-date technology of industry.Equally, traditional media device enterprise is also marching to vehicle entertainment system.

Automobile audio body (Head Unit) is the form of present most of vehicle-mounted media equipment, and its market skewness carries out some analyses to it below.

Upward price trend: possess the automobile audio of CD/MP3 function, will make a price reduction significantly.User's in 2005 customer expected price is 100 dollars.The automobile audio that possesses the DVD function, user's customer expected price 2005 was 400 dollars.

Sales trend: from the world market sales volume, the sales volume maximum of the Head Unit product of north America region, 2004 is Europe and Japan Area 10 times up to 1,000 ten thousand.The European market is the market that is only second to another high growth of North America, and annual in recent years have 25% increase progressively.The Japanese market is relatively stable, does not have significantly to increase.Chinese market is not because the growth year by year of sale of automobile amount with higher speed increment, still also has maturation owing to domestic automobile culture yet, and most of user not will consider and changes automobile audio, so this market scale still is smaller.New automotive entertainment system will replace conventional car stereo, and new automotive entertainment system vehicle-mounted media is a feature richness but expensive product along with the decline of cost, should replace traditional automobile audio in the near future.

Function trend: on the trend of function, on the basis of existing integrated Audio/Visual/Video function, also wanting can integrated Navigation function, and abundant peripheral hardware connects and access ability, such as mobile phone, RAM (random access memory) card, HDD etc.The function that will possess PC in the future realizes and extraneous communication capacity, becomes the Auto PC of integrated ANVC function.

IPod with the Apple company that popularized rapidly in nearly 2 years is an example, if vehicle-mounted media equipment can provide the access integrated functionality of iPod, iPod user will become potential customers so.Same portable hard drive also faces this situation.

In addition, carry out modulation or carry out the technology of DAB video transport via satellite, in Europe, North America, Japan practicability by the ground ripple.Just had in preceding 1 year can receive the mobile unit product that numeral broadcasts and emerge, from the reaction in market, this also will be following important attraction.

Therefore, the mainstream media of entertainment systems from now on will no longer be a closed system, constantly introduce, absorb, merge the new technology of industry.The space that free style system integration product is left vehicle electronic device (as automobile audio, navigating instrument) for to manufacturer's proposition requirements at the higher level automobile front panel all is the size of standard, the space that 1Din and 2Din are arranged at present, so automobile audio, navigating instrument etc. are almost completely all made according to 1Din or 2Din.So-called free style, what refer to is exactly that the external form of vehicle electronic device wants can the Without wishing standard size, can adapt to the multiple special space condition of automobile.

Along with the integrated level of vehicle electronic device is more and more higher, the integration trend of communication between devices is obvious day by day, and the form of independent function specific installation can not satisfy the requirement that automobile is integrated, interconnect.And available space is also more and more littler in the increase of the various electronic equipments in the car load, car, and automobile vendor has recognized this problem, therefore just considers the integration of electronic system when design, also the independent manufacturer of tradition is had higher requirement.Later development is that electronic equipment set manufacturer must be able to provide integrated solution and product, and must be linked in the network of whole automobile by the automobile bus (such as CAN-BUS etc.) of standard, becomes a controllable node.

The variation of north America region automobile construction, cause can not the installation code size Af ter sound equipment, need to make the equipment of abnormity.Therefore a large amount of CAN-BUS and MOST of using in the car of Europe need vehicle electronic device that the function of gateway conversion will be arranged.The profile of Japanese car and interior space will be compact more, leave electronic equipment for, and particularly the space of entertainment systems is littler, therefore needs electronic equipment will change thinking.

Since dwindling of space generally, and interconnected electronic equipment needs a lot of leads, and this part also must be considered.Therefore traditional audio frequency and video wire transmission need be become wireless Bluetooth transmission.

In sum, the shortcoming of traditional car audio player comprises:

1. be not articulated on the network-bus of automobile, on this meaning, he does not really become the bus node of automobile, and the main control unit of automobile can't be understood its duty, also can't to operations such as diagnosing malfunction.The player of our bus makes this node be in constantly under the monitoring of main control unit, at any time it is carried out controls such as order, monitoring.

2. traditional car audio player is based on the CD technology, and operation, debugging are complicated, the servo-drive system of its mechanical part particularly, and being vulnerable to thump influence disk reading capacity and causes playing not smooth, card dish even damage, and while CD CD should not carry the cost height.We have utilized USB flash disk as audio carrier, and capacity is big, and are portable, cost is low, and is reusable.

3. traditional audio player does not have the bluetooth handsfree function, and the driver removes electric complex operation for incoming call in driving procedure, easily take sb's mind off sth.

The utility model content

The utility model proposes a kind of bus type onboard audio player that carries out communication with vehicle-mounted bus that has at the demand in client and market.

A kind of bus type onboard audio player described in the utility model, comprise audio process, described audio process is provided with USB interface, read audio file among USB flash disk or the IPOD by USB interface, audio process also is connected to a FLASH storer, by being stored in the decoding program decoded audio file among the FLASH, output to digital to analog converter by the IIS bus again, audio digital signals is converted into simulating signal and amplifies the last loudspeaker broadcast that is connected to automobile successively through voice-frequency-multichannel multiplexer, audio driver and protection detection circuit; Audio process also connects bluetooth module by serial ports, and described bluetooth module is connected to the 2nd FLASH storer, and the bluetooth module input end connects MIC by MIC power supply control protection detection circuit, and output terminal connects the voice-frequency-multichannel multiplexer; Audio process connects automobile CAN-bus by the CAN transceiver, information is passed to display unit on the automobile show and accept different operating simultaneously.

The utility model is with comprehensive utilizations such as automobile bus technology, Bluetooth technology, audio-visual entertainment technologies, and is rationally integrated.Realize the comprehensive of various functions such as vehicle mounted MP 3 music, iPod music, wireless music are play, mobile phone is hands-free, greatly made things convenient for motorist's use.The input end of processor connects external USB flash disk and IPOD, reads audio format file among USB flash disk and the IPOD and comprises MP3, WMA form or play list file and play, and realizes additional functions such as time-out, F.F., rewind down simultaneously; Processor articulates bluetooth module, the function that realizes bluetooth handsfree comprise adversary's machine incoming call, go electricity, CALL IN PROCESS, phonetic dialing, phone directory synchronous etc.; The input amplification of this product support analogue audio frequency, output function; This product is articulated on the bus of automobile, as a node of automobile bus, accepts the order realization above-mentioned functions that automobile gateway BSI sends.This product has benefited from flourishing day by day semiconductor technology, utilizes the carrier of USB flash disk as audio file, has replaced traditional CD player; This product be through with the driver send a telegram here under steam the electricity puzzlement, utilize the form of bluetooth handsfree to control for mobile phone.

Description of drawings

Fig. 1 is a structured flowchart of the present utility model,

Fig. 2 is the audio frequency output bias circuit;

Fig. 3 is the audio frequency output amplifier;

Fig. 4 is the 5VDC-DC of a system output circuit;

Fig. 5 is that USB flash disk detects electrograph;

Fig. 6 is the IPOD testing circuit;

Fig. 7 is the audio frequency output detection circuit;

Fig. 8 is a simulation source of sound input circuit;

Fig. 9 is the Bluetooth RF circuit;

Figure 10 is the MIC testing circuit.

Embodiment

As shown in Figure 1, bus type onboard audio player described in the utility model, comprise audio process, this audio process is provided with USB interface, read audio file among USB flash disk or the IPOD by USB interface, audio process also is connected to a FLASH storer, by being stored in the decoding program decoded audio file among the FLASH, output to digital to analog converter by the IIS bus again, audio digital signals is converted into simulating signal and amplifies the last loudspeaker broadcast that is connected to automobile successively through voice-frequency-multichannel multiplexer, audio driver and protection detection circuit; Audio process also connects bluetooth module by serial ports, and described bluetooth module is connected to the 2nd FLASH storer, and the bluetooth module input end connects MIC by MIC power supply control protection detection circuit, and output terminal connects the voice-frequency-multichannel multiplexer; Audio process connects automobile CAN-bus by the CAN transceiver, information is passed to display unit on the automobile show and accept different operating simultaneously.The input end of voice-frequency-multichannel multiplexer also is connected with audio frequency input protection detection circuit and is used to insert external source of sound

The utility model has following 5 key points:

1, automobile bus: the CAN bus is called automobile bus again, and its full name is " controller local area network (CAN-Controller Area Network) ".The CAN bus is a kind of fieldbus (being different from office's bus), is a kind of serial communication protocol that German Bosch company develops for the exchanges data that solves between the electronic control module (ECU) numerous in the Hyundai Motor.The design of CAN bus has taken into full account abominable working environment on the automobile, reliability height.Therefore the CAN bus is come out top in many fieldbus, becomes the synonym of automobile bus.This project system adopts enhanced CAN bus module, supports CAN1.2,2.0A and 2.0B agreement, links to each other peak transfer rate 1Mb/s, the Physical layer requirement of compatible ISO-11898 standard with the BSI module by the CAN bus transceiver.

2, the Bluetooth of mobile phone technology: " bluetooth " is the designate of the short-range wireless connect technology standard of a kind of low-power (Bluetooth), be actually a kind of short-distance wireless communication technology, what Bluetooth technology was most widely used in daily life at present is exactly on the mobile phone communication equipment of supporting bluetooth, " bluetooth " technology of utilization, can simplify mobile phone handsets effectively, communication between the mobile communication terminal devices such as earphone, Bluetooth technology is exactly the complete communication protocol system of a cover, in (core specification) file in the Bluetooth technology standard that bluetooth association is delivered, radio wave signal from the bottom, the signal processing mode in middle layer, communication protocol to top various application programs employings, native system can be realized the onboard wireless hand-free call with the Bluetooth of mobile phone pairing, makes driving safer.

3, the prosperous epoch of bluetooth music player: MP3, except tonequality and function, aspect ease of use, people begin that also higher level demand is arranged, and that is exactly the wireless transmission of data.The arriving in MP3 bluetooth epoch also is trend of the times.In the MP3 field, some farsighted producers such as external Samsung, domestic blue evil spirit etc. have begun to have an effect one after another, take the lead in Bluetooth technology is incorporated into the MP3 player.Be about to eve of popularizing in the walkman field in Bluetooth technology, this project can realize that the bluetooth player plays interesting to listen to music by vehicle audio.

4, MP3 music player: the broadcast form of vehicle-mounted music roughly is divided into three kinds: traditional tape, vehicle-mounted CD, digital music (being mainly MP3, WMA).Wherein, conventional tape drives gradually is eliminated, and vehicle-mounted CD is existing main flow, and digital music is just universal day by day with its functional diversities and personalization as new force.This project can realize that the MP3 player is connected playing back music with car audio system.

5, iPod music player: iPod is a kind of high capacity MP3 player that APPLE releases, and Apple Computers are at first the exclusive production marketing of iPod as the Mac customer, but company has added the compatibility to Windows under the situation of increase in demand.To in January, 2004, it is the most popular digital music player of entire United States that iPod becomes, and has captured 50% the market share.This project can realize that iPod is connected with car audio system, and can the controls playing music.

Below in conjunction with accompanying drawing

1, system's operational management

The utility model adopts the double-core design.Wherein audio process adopts the MCF5251ColdFire processor, is used to realize the function except that Streaming Media (broadcast that numeral and analog format move audio file) of mission requirements, and management CAN bus communication; BlueCore5-Multimedia External is used to realize the hands-free phone and the Streaming Media music playback function that require.Both communicate by the UART agreement.

Freescale ColdFire MCF5251 is an audio process

MCF5251 and relevant SDRAM thereof, Flash ROM has formed the master controller system together.It externally provides USB, CAN, UART interface to carry out data communication, and provides some I/O interfaces to be used for control.SDRAM is the 48LC8M162 of the 8M of MICRON company byte technical grade, and FLASH is the S29GL032A of the 4M of SPANSION company byte, and their utilization rate all surpasses 70%, for upgrading later on provides possibility.

BlueCore5-Mult imedia and Flash ROM and emitting module have been formed Bluetooth system together.It carries out data communication by UART interface and MCF5251.Its Flash ROM is the S29GL016A of the 2M of SPANSION company byte, and utilization rate does not also surpass 70%.

2, the broadcast of audio file and management

The broadcast of mobile audio file and management are responsible for by MCF5251.MCF5251 is towards audio frequency microprocessor portable and that the on-vehicle information entertainment audio is used, meets PlaysForSure of Microsoft 2.0 and PlaysFromDevice standard to security and portable requirement.Employing has the ColdFire V2 32-bit microprocessor kernel of 24 bit address lines and 16 position datawires, has a small-sized DSP engine (eMAC) that is fit to very much MP3 and similar application.By two-way CAN interface module, MCF5251 can be used as towards the DAB of automobile and portable audio application and solves scheme.Other hardware capability comprises USB2.0On-the-Go on the sheet (OTG) technology, and it has an integrated high speed (nearly 480Mbps) transceiver, and an anti-tamper real-time clock, is used to improve digital copyright management (DRM).In addition, MCF5251 also meets the AECQ100 standard, and this standard is the mandatory requirement of automobile industry to compressed audio.

3, the hands-free and audio stream broadcast of phone

Phone is hands-free and the audio stream broadcast is responsible by BlueCore5-Multimedia External.BlueCore5-Multimedia External at monophony and I tech clip S Application Design, provides gem-pure voice and sound quality specially, and signal to noise ratio (S/N ratio) is similar the best, reaches 95dB.BlueCore5-Mult imedia chip is also occupying the industry-leading status aspect power consumption and the radio design.Radio transmit power is+6.5dBm that received power is-90dBm interference to be dropped to minimum when listening to music or receiving calls.BlueCore5-Multimedia is the single-chip bluetooth platform of internal memory on unique built-in powerful 64MIPS DSP and the sheet, the functional various third party softwares of enhancement mode audio-frequency function and extended pattern be can support to realize, thereby mobile phone, earphone and on-vehicle hand-free system increment are.Bluetooth platform based on DSP has the enhancement function that enough abilities are supported following software.Fig. 9 is the Bluetooth RF circuit;

4, CAN communication function

Circuit is supported fault-tolerant low speed CAN bus communication.By CAN interface and the TJA1055 transceiver of MCF5251, can realize the requirement of the CAN communication that charter is listed.

5, system's power consumption

System power supply has two-stage, divides three tunnel outputs.First order power supply is TPS5430 and MIC2951-03YM, and second level power supply is LM1117.5.1 volts of TPS5430 outputs are the VBUS and the LM1117 power supply of USB interface.5 volts of MIC2951-03YM outputs are the audio system power supply.LM1117 output 3.3V voltage is processor (comprising MCF5251 system and Bluetooth system) power supply.TPS5430 and MIC2951-03YM be by linking to each other with external power source through holding circuit, and its operating voltage range is (7.5V-24V); The driving power of LM1117 is supplied with by TPS5430.Fig. 4 is the 5VDC-DC of a system output circuit.

6, voicefrequency circuit

Voicefrequency circuit system management three tunnel input sources of sound also externally provide audio frequency output.Three road audio frequency power supplys are respectively MCF5251 digital tone source, external analog source of sound and bluetooth source of sound, and three road sources of sound switch by analog switch MAX4098.MCF5251 manages the music file of mobile USB flash disk or IPOD and is carried out in accordance with regulations decoding, is converted to simulated audio signal and delivers to MAX4098 by UDA1334BT; The difference sound signal of bluetooth output is converted to single-ended signal and delivers to MAX4098 by TLV2372.MAX9724AETC externally provides the 2VRMS sound signal as the output amplifier, and its enlargement factor is selected to change according to different sources of sound automatically.Fig. 2 is the audio frequency output bias circuit; Fig. 3 is the audio frequency output amplifier; Fig. 7 is the audio frequency output detection circuit; Fig. 8 is a simulation source of sound input circuit;

7, system interface

According to designing requirement, system has two splicing ears.Terminal 1 is MQS18, and terminal 2 is GT17H-4P-2H.Each pin of MQS18 defines as requested and links to each other with each functional circuit, and USB interface directly links to each other with the USB module of MCF5251.The USB module of MCF5251 is supported the requirement of USB2.0 standard.Relevant power supply and holding circuit design can realize mission requirements.Fig. 5 is that USB flash disk detects electrograph; Fig. 6 is the IPOD testing circuit;

8, other circuit

Other circuit mainly comprise the CAN transceiver circuit, IPOD decoding circuit, reset circuit, MIC testing circuit (Figure 10), eeprom circuit and system protection and failure detector circuit.

Claims (2)

1, a kind of bus type onboard audio player, comprise audio process, it is characterized in that, described audio process is provided with USB interface, read audio file among USB flash disk or the IPOD by USB interface, audio process also is connected to a FLASH storer, by being stored in the decoding program decoded audio file among the FLASH, output to digital to analog converter by the IIS bus again, audio digital signals is converted into simulating signal and amplifies the last loudspeaker broadcast that is connected to automobile successively through voice-frequency-multichannel multiplexer, audio driver and protection detection circuit; Audio process also connects bluetooth module by serial ports, and described bluetooth module is connected to the 2nd FLASH storer, and the bluetooth module input end connects MIC by MIC power supply control protection detection circuit, and output terminal connects the voice-frequency-multichannel multiplexer; Audio process connects automobile CAN-bus by the CAN transceiver, information is passed to display unit on the automobile show and accept different operating simultaneously.

2, bus type onboard audio player according to claim 1 is characterized in that, the input end of voice-frequency-multichannel multiplexer also is connected with audio frequency input protection detection circuit and is used to insert external source of sound.

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