CN2833719Y - Vehicle-mounted virtual MP3 disk box - Google Patents

Abstract

The utility model relates to the field of vehicle audio players, more specifically a vehicle virtual MP3 dish box, wherein a P89LPC931F chip is taken as a central control CUP; a VIRATA VC5409PGE is taken as a DSP digital signal processing chip; a two M Flash EPROM chip SST39VF020 is taken as a control program command memory; the P89LPC931F is connected with a CYPRESS SL811HST USB HOST master chip by an SST 39VF020; the master chip is connected with Flash equipment or USB mobile hard disk of a USB interface; the master chip is directly connected with a 2.5 inch hard disk by an ATA turning USB interface circuit; the vehicle MP3 system completely simulates a vehicle CD dish box protocol, realizes MP3 playing by the CD dish box, is capable of simulating unlimited CD dishes and leads the vehicle MP3 system to become a best solution that a vehicle audio system simulative sound source is changed into the digital music in a transitional mode.

Description

Vehicular virtual MP3 dish case

Technical field:

The utility model relates to vehicle audio player field, is a kind of Vehicular virtual MP3 dish case specifically.

Technical background:

At present, traditional vehicle audio Play System mainly comprises cassette recorder and CD player, and automobile industry has very big storage at home.Cassette recorder tonequality is relatively poor, and CD exists that the song capacity is little, the shock resistance difference and serviceable life short shortcoming; In addition, in general, magnetic tape reel or the song that CD often has only one, two first songs to prefer, not only selectivity is relatively poor, also has waste.Along with the continuous maturation of digital music MP3 and other digital technology, vehicle-mounted cassette recorder and CD player are expected progressively to be substituted by vehicle mounted MP 3 or other Audiotechnica at present.

In the like product, what vehicle mounted MP 3 market was at present popular mainly is radiofrequency launcher class vehicle mounted MP 3 product at present.This series products is accepted system to the song of MP3 song on the carry-on portable USB flash disk or the broadcast of other sources of sound by the FM that the electronics radio-frequency unit is transmitted into automobile, and is played back by the cigar lighter power taking.There is the loss of tonequality in source of sound after changing by wireless transmit.And this series products all must be connected on the cigar lighter, has occupied interior space, brings certain unfavorable factor and potential safety hazard to travelling.

Summary of the invention:

The purpose of this utility model is to propose a kind of Flash of use flash disk or 2.5 cun notebook hard disks as the program source carrier of vehicle audio, simulates vehicle audio CD dish case control protocol to reach the high capacity MP3 player that does not change original control mode of CD main frame and keypress function (broadcast, selected songs, EQ are provided with etc.) by using a kind of Circuits System.

The purpose of this utility model is achieved in that the P89LPC931F chip controls CPU as central authorities, is responsible for the control and the transmission of total system; VIRATA VC5409PGE assists STA013RL MP3 decoding chip to carry out MP3 decoding as the DSP digital signal processing chip; The Flash EPROM chip SST 39VF020 that adopts 2M is as control program instruction (mainly being CD dish case agreement and programmed instruction) storer, and can be used as the pre-read data file of level cache, accelerates system handles speed.P89LPC931F connects CYPRESSSL811HST USB Host main control chip by SST 39VF020, this main control chip not only can connect the Flash equipment or the USB portable hard drive of USB interface, can also change usb circuit by ATA in addition, directly connect 2.5 cun hard disks.Mp3 file is stored in USB flash disk or the USB hard disk with certain file structure.P89LPC931F is after receiving main system of audio panel control signals such as playing request, read the Flash EPROM chip program instruction that is pre-stored in SST 39VF020 2M, control the SL811HST chip then and read USB interface equipment (USB flash disk or USB portable hard drive) or read mp3 file and current state information in the ATA memory device (2.5 cun hard disks of 44PIN).Mp3 file directly send STA013RL decoding chip and VC5409PGE to carry out voice codec and handles, after by 24 D/A analog-digital chip WM8761ED audio digital signals being changed into simulating signal, after sending the pre-amplifying circuit of automobile audio to carry out signal amplification and acoustic processing, output to the vehicle audio loudspeaker; Status signal then send the panel display controller, shows present broadcast state (as song and title of the song etc.) on panel.System's primary power plug behind the main system of audio is obtained direct current+12V voltage, converts 5V voltage to by PHILIPS 74HC125D, converts 3.3V voltage to by AMS117 voltage stabilizing chip, is respectively each chip supply voltage through voltage stabilizing is provided.

Pass through such scheme, the vehicle mounted MP 3 system has simulated automobile CD dish case agreement fully, form with CD dish case has realized the MP3 broadcast, and can simulate the CD butterfly (the capacity of memory device size that depends on employing) of unlimited amount, has really realized magnanimity vehicle mounted MP 3 Play System; And, farthest catered to the original operating habit of user because main system of audio is operated almost no change of control mode to the dish case; Because can conveniently the obtaining of MP3, use cost is low and near characteristics such as CD Quality, make this vehicle mounted MP 3 system become the best solution of car audio system simulation sound source to the digital music transition.

The beneficial effect that the utility model produced: support the broadcast of digital music files such as MP3, made things convenient for the acquisition of user's program source; In the audio chip of U.S. BBE authentication is arranged, tonequality is very near CD, non-market radio frequency class MP3 product can match in excellence or beauty; The full-electronic design, no activity device is definitely shockproof; Adopt large scale integrated circuit design, have the characteristics of high reliability and high stability; With former car sound equipment seamless combination, plug and play; All operations changes original operating habit hardly as operation CD/ magnetic tape station; The long-life design has high reliability and stability, and non-general vehicle-mounted CD has only the life-span of 3-5 like that; Capacity of memory device can freely be selected, and makes memory device with USB flash disk, and capacity can be selected flexibly at 32M-1024M (upward-compatible), makes memory device with hard disk, then can adopt all hard disc apparatus on the market; Day by day enriching of Internet resources, network can reach 5,000,000 head for the MP3 song of downloading; The user can download music program easily from the Internet, and can edit the programme content of oneself liking arbitrarily; Single purchase no longer includes the expenditure of song CD, has reduced user's use cost; Adopt 24 powerful MP3 codec chips of performance index, can support 8KHz-320Kbps code stream and 8K-48KHzs sample frequency; Products Compatibility is very strong.Can compatible multiple memory device such as USB flash disk, Mp3 player, all kinds of digital memory card (as memory stick, SD card, CF card etc.), hard disk and micro harddisk, can play the song files of multiple forms such as MP3, WAV and WMA; Since the increase of storage space, the variation that has caused program to be selected.Adopt the MP3 player of the imitative dish case of hard disk can play the very large program source of capacity, as cross-talk, storytelling, opera etc.

Correlation analysis: at first, product incision market is an incremental process, must at first consider user's use, operating habit problem.Adapt to the user operation habits problem so we can solve well by the simulation to CD dish case, the user need not change original in modes of operation such as CD broadcast, choosing songs, and nature can be easy to accept this product; Secondly, vehicle-mounted CD player generally all has dish case interface, can connect 6 dish or 10 dish, by simulating CD dish case with large-capacity storage media (flash disk or hard disc of computer) as the source of sound carrier, can break through program source in capacity and quantitative restriction.The storage medium of Cai Yonging has good shock resistance simultaneously.The flash disk capacity has reached more than the 1GB at present, as the average 4MB of mp3 file, can deposit 250 first songs; As adopt the 120GB hard disk, then can deposit 30000 first songs.And after the memory capacity increase, directly cause the kind of program source to increase, can deposit most sound programmes with hard disk as the source of sound carrier, as popular song, opera, cross-talk, essay, even long storytelling, and traditional tape or CD are difficult to be competent at.The 3rd, because the CD of every kind of brand, every kind of model and CD dish case all have the otherness of controlling (being usually said dish case agreement), so need be at the different different electronic simulation systems of CD dish case design of protocol, to realize sound-reducing better.In addition, we have adopted 24 powerful MP3 codec chips of performance index in system, can support 8KHz-320Kbps code stream and 8K-48KHzs sample frequency, can realize effective reduction of sound, and we have adopted the audio chip of U.S. BBE authentication in system, cause the defective of tonequality loss to do the sound compensation at the MP3 compressed file format, the quality that can keep sound well, sound effect is near CD quality (owing to the present online download mp3 file that supplies mainly is to adopt the program source on the CD dish to generate, so tonequality also can't surpass CD at present).

Description of drawings:

Fig. 1 is a structural representation sketch of the present utility model.

Fig. 2 is the utility model circuit diagram.

As shown in Figure 1: 1 expression program storage medium (flash disk or hard disc of computer), 2 expression codec chips, 3 expression MCU control chips, 4 expression sound effect chips, 5 expression automobile audio main frames (as vehicle-mounted CD player), 6 expression Music centre loudspeaker outputs.

Embodiment:

Below in conjunction with description of drawings the utility model:

As shown in Figure 1: 1 expression program storage medium (flash disk or hard disc of computer), 2 expression codec chips, 3 expression MCU control chips, 4 expression sound effect chips, 5 expression automobile audio main frames (as vehicle-mounted CD player), 6 expression Music centre loudspeaker outputs.

The purpose of this utility model is to propose a kind of Flash of use flash disk or 2.5 cun notebook hard disks as the program source carrier of vehicle audio, simulates vehicle audio CD dish case control protocol to reach the high capacity MP3 player that does not change original control mode of CD main frame and keypress function (broadcast, selected songs, EQ are provided with etc.) by using a kind of Circuits System.

The purpose of this utility model is achieved in that the P89LPC931F chip controls CPU as central authorities, is responsible for the control and the transmission of total system; VIRATA VC5409PGE assists STA013RL MP3 decoding chip to carry out MP3 decoding as the DSP digital signal processing chip; The Flash EPROM chip SST 39VF020 that adopts 2M is as control program instruction (mainly being CD dish case agreement and programmed instruction) storer, and can be used as the pre-read data file of level cache, accelerates system handles speed.P89LPC931F connects CYPRESSSL811HST USB Host main control chip by SST 39VF020, this main control chip not only can connect the Flash equipment or the USB portable hard drive of USB interface, can also change usb circuit by ATA in addition, directly connect 2.5 cun hard disks.Mp3 file is stored in USB flash disk or the USB hard disk with certain file structure.P89LPC931F is after receiving main system of audio panel control signals such as playing request, read the Flash EPROM chip program instruction that is pre-stored in SST 39VF020 2M, control the SL811HST chip then and read USB interface equipment (USB flash disk or USB portable hard drive) or read mp3 file and current state information in the ATA memory device (2.5 cun hard disks of 44PIN).Mp3 file directly send STAO13RL decoding chip and VC5409PGE to carry out voice codec and handles, after by 24 D/A analog-digital chip WM8761ED audio digital signals being changed into simulating signal, after sending the pre-amplifying circuit of automobile audio to carry out signal amplification and acoustic processing, output to the vehicle audio loudspeaker; Status signal then send the panel display controller, shows present broadcast state (as song and title of the song etc.) on panel.System's primary power plug behind the main system of audio is obtained direct current+12V voltage, converts 5V voltage to by PHILIPS 74HC125D, converts 3.3V voltage to by AMS117 voltage stabilizing chip, is respectively each chip supply voltage through voltage stabilizing is provided.

Pass through such scheme, the vehicle mounted MP 3 system has simulated automobile CD dish case agreement fully, form with CD dish case has realized the MP3 broadcast, and can simulate the CD butterfly (the capacity of memory device size that depends on employing) of unlimited amount, has really realized magnanimity vehicle mounted MP 3 Play System; And, farthest catered to the original operating habit of user because main system of audio is operated almost no change of control mode to the dish case; Because can conveniently the obtaining of MP3, use cost is low and near characteristics such as CD Quality, make this vehicle mounted MP 3 system become the best solution of car audio system simulation sound source to the digital music transition.

As shown in the figure: detect the played songs request that CD main frame 5 sends as microcontroller 3, then decoding chip 2 reads mp3 file from flash disk 1 and carries out MP3 decoding, after handling by 4 pairs of sound of sound effect chip, exports speaker 6 to through amplifying circuit at last.

Claims (1)

1, a kind of Vehicular virtual MP3 dish case, it is characterized in that: the P89LPC931F chip is controlled CPU as central authorities, VIRATA VC5409PGE is as the DSP digital signal processing chip, the FlashEPROM chip SST 39VF020 that adopts 2M is as the control program command memory, P89LPC93lF connects CYPRESS SL811HST USB Host main control chip by SST39VF020, main control chip connects the Flash equipment or the USB portable hard drive of USB interface, main control chip changes usb circuit by ATA, directly connects 2.5 cun hard disks.