CN1996485A - Vehicular insertion-card MP3 player and its playing implementation method - Google Patents
Vehicular insertion-card MP3 player and its playing implementation method Download PDFInfo
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- CN1996485A CN1996485A CNA2005101122632A CN200510112263A CN1996485A CN 1996485 A CN1996485 A CN 1996485A CN A2005101122632 A CNA2005101122632 A CN A2005101122632A CN 200510112263 A CN200510112263 A CN 200510112263A CN 1996485 A CN1996485 A CN 1996485A
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Abstract
A vehicle mounted plug type MP3 player and its playing realization comprises an outside shell, panel and inside function circuit, several control knob embedded on the panel, display and card memory interface, power input interface embedded on the outside shell, and audio output interface, with inside function circuit composed of multi media processing module, storage module, display control module, card type storage interface control module, audio model conversion module and power conversion module. It comprises scanning the existence of the MP3 media files, displaying the playable information, making model conversion and sending it to audio output interface. It is small in size, low in power consumption, simple, and cost saving, with extensive application.
Description
Technical field
The present invention relates to the mobile unit field, particularly the car audio system field specifically is meant a kind of Vehicular insertion-card MP 3 player and plays implementation method.
Background technology
In the modern life, automobile is more and more universal, and for family-sized car, the kind and the function of wherein each kind equipment are also more and more various, especially in the present sedan limousine, all equip audio-visual devices such as senior car sound equipment and CD, but do not seen the MP3 player application.Simultaneously, also only relate to the vehicle mounted MP 3 player that uses the video disc carrier in the existing patent documentation, and the vehicle mounted MP 3 player that uses USB interface, the use of such player is all very inconvenient, and the capacity of medium and the substitute mode of file are all very inconvenient.
Summary of the invention
The objective of the invention is to have overcome above-mentioned shortcoming of the prior art, provide that a kind of volume is less, power consumption is lower, adapt to vehicle environment, media file data upgrade efficient and convenient, be convenient to function expansion, easy to operate, audio better, stable and reliable working performance, applicable surface Vehicular insertion-card MP 3 player and play implementation method comparatively widely.
In order to realize above-mentioned purpose, Vehicular insertion-card MP 3 player of the present invention and broadcast implementation method thereof are as follows:
This Vehicular insertion-card MP 3 player, comprise shell, panel and inner functional circuit, its principal feature is, be embedded with several control knobs on the described panel, display screen and card type memory interface, be embedded with power input interface and audio output interface on the described shell, described inner function circuit comprises the multimedia processing module, memory module, the display screen control module, the card type memory interface control module, the audio frequency D/A converter module, power transfer module, described multimedia processing module respectively with memory module, the display screen control module, the card type memory interface control module is connected with the audio frequency D/A converter module, described power transfer module respectively with the multimedia processing module, memory module, the display screen control module, the card type memory interface control module is connected with the audio frequency D/A converter module; Described several control knobs are connected with the multimedia processing module, described display screen is connected with the display screen control module, described power input interface is connected with power transfer module, described audio output interface is connected with the audio frequency D/A converter module, and described card type memory interface is connected with the card type memory interface control module.
The multimedia processing module of this Vehicular insertion-card MP 3 player is an EM8620L multimedia process chip.
The memory module of this Vehicular insertion-card MP 3 player comprises that model is the DDRSDRAM storage chip of MT46V16M16TG-6T and the Flash storage chip that model is MX29LV640BB.
The display screen of this Vehicular insertion-card MP 3 player is vacuum fluorescent display screen VFD, and described display screen control module is the vacuum fluorescent display screen control chip.
The card type memory interface of this Vehicular insertion-card MP 3 player comprises CF card slot, SM card slot, MS card slot and SD/MMC card slot, and described card type memory interface control module is a storage card Card Reader control chip.
The memory module of this Vehicular insertion-card MP 3 player also comprises a CF2 type storage card, and this CF2 type storage card is connected with described storage card Card Reader control chip.
Also be embedded with USB interface on the panel of this Vehicular insertion-card MP 3 player, described inner function circuit also includes a USB controller, and described USB interface is connected with described multimedia processing module by this USB controller.
The audio frequency D/A converter module of this Vehicular insertion-card MP 3 player is a CS4340-KS DAC analog-digital chip, and described audio output interface is a RCA lotus flower head interface.
The power input interface of this Vehicular insertion-card MP 3 player comprises direct supply input lead and direct supply input socket.
This uses above-mentioned player to realize the method for MP3 music under the vehicle environment, and its principal feature is that described method may further comprise the steps:
(1) system carries out initialization operation;
(2) multimedia processing module driver card slice memory interface control module scanning card slice memory interface and memory module detect whether there is the MP3 media file;
(3) if there is no MP3 media file, then the multimedia processing module drives the display screen control module show the information that does not have file to play on display screen, and repeating step (2);
(4) if there is the MP3 media file, then the multimedia processing module reads corresponding M P3 media file and plays;
(5) the multimedia processing module is sent into the sound signal that produces in the audio frequency D/A converter module;
(6) the audio frequency D/A converter module carries out sound signal to deliver to audio output interface after the corresponding digital-to-analog conversion;
(7) the multimedia processing module receives control signal according to user's operation from control knob, and carries out corresponding playback process, play mode set handling, menu operation processing, media file copy process and media file deletion and handle.
The playback process of the method for MP3 music is under this realization vehicle environment:
Play, suspend broadcast respectively, stop to play, play a last head, play next, increase broadcast sound volume, reduce the operation of broadcast sound volume according to user operation.
The play mode set handling of the method for MP3 music is under this realization vehicle environment:
Operate the setting of carrying out single broadcast, single loop play respectively, all playing, circulate all broadcasts and shuffle pattern in proper order according to the user.
Adopt the Vehicular insertion-card MP 3 player of this invention and play implementation method, because the volume of this player much smaller than vehicle-mounted CD, therefore is convenient to install in arbitrary position of car body, and is simultaneously big than Portable MP 3 again, button operation is more comfortable, and screen display is clearer; Simultaneously, this player low in energy consumption with the input of car power supply, done the power source conversion adjustment at machine intimate, can use on any car, and owing to there is not moving component, so need not do the consideration on the anti-seismic performance, can save cost greatly; And this player can be supported 6 kinds of most popular card type memories of society, and such storer carries extremely convenient, store very greatly, data refresh mode is simple, moreover, can also support the broadcast of multiple audio format medium, only need to support more form by software upgrading; Aspect system extension, this player can pass through the USB interface update software, thereby upgrading and expanded function are for example upgraded operator scheme, adds form support etc.; Simultaneously, adopt high-quality audio decoder chip and circuit in this player, high-quality hearing enjoying can be provided, and share original car power amplifier with equipment such as CD, need not optional equipment audio amplifier equipment, it is extremely convenient to be equipped with.Can be attached in arbitrary car body that is not equipped with this player through simple refit, application is extremely extensive; Moreover, this player and its implementation can support to snap into card, snap into flash disk, and flash disk is to the audio file copy between the card.Simultaneously fuselage self is also built-in storage space in a large number, in order to storing audio files, and storage card slot supports hot plug, thus stable and reliable working performance, applicable surface is comparatively extensive, brings great convenience to people.
Description of drawings
Fig. 1 is the hardware capability module map of Vehicular insertion-card MP 3 player of the present invention.
Fig. 2 is the schematic appearance of Vehicular insertion-card MP 3 player of the present invention.
Fig. 3 is the back interface synoptic diagram of Vehicular insertion-card MP 3 player of the present invention.
Fig. 4 is the workflow diagram that Vehicular insertion-card MP 3 player of the present invention is realized broadcast.
Embodiment
In order more to be expressly understood technology contents of the present invention, describe in detail especially exemplified by following examples.
See also Fig. 1 to shown in Figure 3, this Vehicular insertion-card MP 3 player, comprise shell 1, panel 2 and inner functional circuit, wherein, be embedded with several control knobs 21 on the described panel 2, display screen 22 and card type memory interface, described display screen 22 is vacuum fluorescent display screen 22 (VFD Vacuum Fluorescence Display), described card type memory interface comprises CF card slot 61, SM card slot 62, MS card slot 63 and SD/MMC card slot 64, in the present embodiment, also be embedded with USB interface 65 on this panel 2, be embedded with power input interface and audio output interface 3 on the described shell 1, this power input interface comprises direct supply input lead 51 and direct supply input socket 52.Described inner function circuit comprises multimedia processing module 41, memory module, display screen control module 42, card type memory interface control module 43, audio frequency D/A converter module 44, power transfer module 45, this multimedia processing module 41 is an EM8620L multimedia process chip 41, and described card type memory interface control module 43 is a storage card Card Reader control chip 43; This memory module comprises that model is the DDR SDRAM storage chip 46 of MT46V16M16TG-6T and the Flash storage chip 47 that model is MX29LV640BB, this memory module can also comprise a CF2 type storage card 48 simultaneously, and this CF2 type storage card 48 is connected with described storage card Card Reader control chip 43; Described display screen control module 42 is a vacuum fluorescent display screen control chip 42; Described inner function circuit also includes a USB controller 49, and described USB interface 65 is connected with described multimedia processing module 41 by this USB controller 49; Described audio frequency D/A converter module 44 is a CS4340-KS DAC analog-digital chip 44, and described audio output interface 3 is RCA, and RCA is a kind of video/audio transmission interface of standard, because shape is like the chain flower, so be lotus flower head interface again.
Described multimedia processing module 41 respectively with memory module in DDR SDRAM storage chip 46 be connected with Flash storage chip 47, display screen control module 42, card type memory interface control module 43 and audio frequency D/A converter module 44, described power transfer module 45 is connected with multimedia processing module 41, memory module, display screen control module 42, card type memory interface control module 43 and audio frequency D/A converter module 44 respectively; Described several control knobs 21 are connected with multimedia processing module 41, described display screen 22 is connected with display screen control module 42, described power input interface is connected with power transfer module 45, described audio output interface 3 is connected with audio frequency D/A converter module 44, and described card type memory interface is connected with card type memory interface control module 43.
In the middle of reality was used, the function of various piece was as follows:
1. inner function circuit
This player internal circuit configuration compactness, function is also quite single-minded.Owing to consider substantially to be equipped with radio system on the car, do not add the design of radio reception so this player installs the broadcast of popular at present portable MP3 employing additional, but abandoned the radio reception part, so avoided adding unnecessary cost.Because high-grade car all has been equipped with expensive vehicle power amplifier and sound equipment, add that vehicular equipment itself is high with regard to price, thereby the audio decoding circuit of this machine selects top process chip for use, the acoustics that can match in excellence or beauty with traditional C D tonequality can be provided almost.
(1) EM8620L multimedia process chip 41
This chip is the multimedia process chip that SigmaDesigns company produces, and is the kernel processor chip of native system.This chip is made up of the control of DDR internal memory, parallel FLASH, audio/video output interface, DVD driver, lcd drive chip etc.The embedded arm processor of this chip uses the UC-LINUX embedded OS, and powerful Network Transmission is provided, the recording of Voice ﹠ Video, play, function such as processing.In this equipment, the function that the present invention has only used its voice playing to handle.Use the 64MDDR internal memory of this chip standard configuration, very high message transmission rate is provided.
(2) internal memory
The DDR SDRAM storage chip 46 of the 32M that two models are MT46V16M16TG-6T.
(3) FLASH flash memory
Use MX29LV640BB storage chip 47, the parallel storage capacity of 8M is provided.
(4) the VFD control chip 42
Be used to drive and control the demonstration output of VFD.
(5) the USB2.0 control chip 49
This chip is controlled the data transmission on the usb bus as the USB2.0 controller.
(6) the Card Reader control chip 43
This chip be used to control and 6 kinds of storage cards expanding between data transmission.This machine configuration 4 card reader slots, allow to insert simultaneously four dissimilar storage cards, popular 6 kinds of storage cards on the compatible society.Simultaneously fuselage interior has been equipped with the storage card of the CF2 type of a 512M again, greatly facilitate user media storage and with the exchanging of miscellaneous equipment.
(7) analog-digital chip 44
Because the audio frequency of EM8620L is output as digital format,, export from the AV interface then so need external CS4340-KS DAC chip that sound signal is carried out the conversion of digital to analogy.
(8) power transfer module 45
This module receives the direct current of 14V ± 0.5V from the outside, and provides various required voltage and currents for other module of system.
2. front panel
(1) panel button 21
The user carries out the open and close machine by panel button, plays, suspends, stops, entering operations such as menu, deleted file, copied files, adjusting volume.
(2) the VFD display screen 22
The song title that shows current broadcast, reproduction time, information such as broadcast state, pattern.
(3) the CF card slot 61
Support CF1 card and CF2 card
(4) the SM card slot 62
(5) the MS card slot 63
(6) the SD/MMC card slot 64
(7) USB interface 65
Be used to insert general USB, flash disk formula MP3 visits the music media in these movable storage devices, and it is carried out editing and processing.
(8) shell 1
3. rear interface
(1) direct supply input socket 52
When the user removed this machine from car body, the user can use AC220 to change the electric main that the DC14V AC/DC changeover switch is connected to 220V/50Hz, and the output of transformer is directly connected to this interface, and machine can use.
(2) the direct supply input lead 51
Be used to connect the DC14V ± 0.5V power supply of car.Owing to adopt casing and car body altogether, only need single power lead.
(3) stereo AV audio frequency output 3
The RCA interface is used in this output, is directly connected to the car power amplifier.
See also shown in Figure 4ly again, this uses above-mentioned player to realize the method for MP3 music under the vehicle environment, may further comprise the steps:
(1) system carries out initialization operation;
(2) multimedia processing module 41 driver card slice memory interface control modules 43 scanning card slice memory interface and memory modules detect whether there is the MP3 media file;
(3) if there is no MP3 media file, then multimedia processing module 41 drives display screen control modules 42 show the information that does not have file to play on display screen 22, and repeating step (2);
(4) if there is the MP3 media file, then multimedia processing module 41 reads corresponding M P3 media file and plays;
(5) multimedia processing module 41 is sent into the sound signal that produces in the audio frequency D/A converter module 44;
(6) audio frequency D/A converter module 44 carries out sound signal to deliver to audio output interface 3 after the corresponding digital-to-analog conversion;
(7) multimedia processing module 41 receives control signal according to user's operation from control knob 21, and carries out corresponding playback process, play mode set handling, menu operation processing, media file copy process and media file deletion and handle.
Wherein, this playback process is: play, suspend broadcast respectively, stop to play, play a last head, play next, increase broadcast sound volume, reduce the operation of broadcast sound volume according to user operation.
This play mode set handling is: operate the setting of carrying out single broadcast, single loop play respectively, all playing, circulate all broadcasts and shuffle pattern in proper order according to the user.
In the middle of practical application, use method of the present invention, after this MP3 player start, system searches for the MP3 media file in all card type memories automatically.If search mp3 file, then begin automatically to play, otherwise show the information that no file can be broadcast.After beginning is play automatically, to do time-out according to user's input, stop to play, play mode is set, enters menu, sequence of operations such as copy, deletion MP3 media file, play when current song and can select whether continue to play or repeat playing according to play mode after finishing.When being closing machine by the PLAY button after three seconds with the head of a household.
As described below about the detail operations design in process user input and the broadcast state process:
In the playing process, weak point can suspend broadcast by the PLAY key.
Under the broadcast state, last one first single can be play, next single can be play by NEXT by PREV.
Behind the time-out, weak point can restart to play by the PLAY key.
Weak point can stop to play by the STOP key under broadcast or the halted state.
Weak point can enter setup menu by the MENU key, demonstration is set, deleted file, operations such as copied files.
Long by the MENU key can make play mode single broadcasts/single circulation/order all play/circulate all broadcasts/and shuffle between switch.
Volume can be increased by the VOL+ key, volume can be reduced by VOL-.
The management of card type memory and file:
After entering by the MENU key, can see the FILE menu.Can show 6 dish names after entering, be respectively DISK0: built-in storage card, DISK1:CF card, DISK2:SM card, DISK3:MS card, DISK4:SD/MMC, DISK5:USB.The user can enter by MENU, and can show the file in each dish, can show a last file/next file by LEFT/RIGHT, can be by the DELETE deleted file.After pressing COPY, will point out user's select target dish, the user can copy files in the destination disk by COPY after selecting again.
This machine is supported software upgrading easily, and the user only need deposit upgrade file in an any card type memory, then card is inserted machine, and the Macintosh of upgrading software is pressed in the start back, system's meeting autoscan upgrade file, and realize the software upgrading.
In order to meet automobile-used standard, this player audio output meets the standard of following table.
| Sequence | Project | Index | |
| 1 | Audio | 1300mV | |
| 2 | Degree of separation | ≥70dB(1KHz) | |
| 3 | ≥60dB(125Hz～10kHz) | ||
| 4 | Distortion | ≤-60dB | |
| 5 | Frequency error | ±0.02％ | |
| 6 | The audio frequency amplitude-frequency response | ±3dB (17Hz～19997Hz) | |
| 7 | The audio frequency signal to noise ratio (S/N ratio) | ≥85dB |
| 10 | The frequency response of postemphasising | -20dB±3dB (4kHz～16kHz) |
Adopt above-mentioned Vehicular insertion-card MP 3 player and play implementation method, because the volume of this player much smaller than vehicle-mounted CD, therefore is convenient to install in arbitrary position of car body, and is simultaneously big than Portable MP 3 again, button operation is more comfortable, and screen display is clearer; Simultaneously, this player low in energy consumption with the input of car power supply, done the power source conversion adjustment at machine intimate, can use on any car, and owing to there is not moving component, so need not do the consideration on the anti-seismic performance, can save cost greatly; And this player can be supported 6 kinds of most popular card type memories of society, and such storer carries extremely convenient, store very greatly, data refresh mode is simple, moreover, can also support the broadcast of multiple audio format medium, only need to support more form by software upgrading; Aspect system extension, this player can pass through the USB interface update software, thereby upgrading and expanded function are for example upgraded operator scheme, adds form support etc.; Simultaneously, adopt high-quality audio decoder chip and circuit in this player, high-quality hearing enjoying can be provided, and share original car power amplifier with equipment such as CD, need not optional equipment audio amplifier equipment, it is extremely convenient to be equipped with.Can be attached in arbitrary car body that is not equipped with this player through simple refit, application is extremely extensive; Moreover, this player and its implementation can support to snap into card, snap into flash disk, and flash disk is to the audio file copy between the card.Simultaneously fuselage self is also built-in storage space in a large number, in order to storing audio files, and storage card slot supports hot plug, thus stable and reliable working performance, applicable surface is comparatively extensive, brings great convenience to people.
In this instructions, the present invention is described with reference to its certain embodiments.But, still can make various modifications and conversion obviously and not deviate from the spirit and scope of the present invention.Therefore, instructions and accompanying drawing are regarded in an illustrative, rather than a restrictive.
Claims (12)
1, a kind of Vehicular insertion-card MP 3 player, comprise shell, panel and inner functional circuit, it is characterized in that, be embedded with several control knobs on the described panel, display screen and card type memory interface, be embedded with power input interface and audio output interface on the described shell, described inner function circuit comprises the multimedia processing module, memory module, the display screen control module, the card type memory interface control module, the audio frequency D/A converter module, power transfer module, described multimedia processing module respectively with memory module, the display screen control module, the card type memory interface control module is connected with the audio frequency D/A converter module, described power transfer module respectively with the multimedia processing module, memory module, the display screen control module, the card type memory interface control module is connected with the audio frequency D/A converter module; Described several control knobs are connected with the multimedia processing module, described display screen is connected with the display screen control module, described power input interface is connected with power transfer module, described audio output interface is connected with the audio frequency D/A converter module, and described card type memory interface is connected with the card type memory interface control module.
2, Vehicular insertion-card MP 3 player according to claim 1 is characterized in that, described multimedia processing module is an EM8620L multimedia process chip.
3, Vehicular insertion-card MP 3 player according to claim 1 is characterized in that, described memory module comprises that model is the DDR SDRAM storage chip of MT46V16M16TG-6T and the Flash storage chip that model is MX29LV640BB.
4, Vehicular insertion-card MP 3 player according to claim 1 is characterized in that, described display screen is vacuum fluorescent display screen VFD, and described display screen control module is the vacuum fluorescent display screen control chip.
5, Vehicular insertion-card MP 3 player according to claim 1, it is characterized in that, described card type memory interface comprises CF card slot, SM card slot, MS card slot and SD/MMC card slot, and described card type memory interface control module is a storage card Card Reader control chip.
6, Vehicular insertion-card MP 3 player according to claim 5 is characterized in that, described memory module also comprises a CF2 type storage card, and this CF2 type storage card is connected with described storage card Card Reader control chip.
7, Vehicular insertion-card MP 3 player according to claim 1, it is characterized in that, also be embedded with USB interface on the described panel, described inner function circuit also includes a USB controller, and described USB interface is connected with described multimedia processing module by this USB controller.
8, Vehicular insertion-card MP 3 player according to claim 1 is characterized in that, described audio frequency D/A converter module is a CS4340-KS DAC analog-digital chip, and described audio output interface is a RCA lotus flower head interface.
9, Vehicular insertion-card MP 3 player according to claim 1 is characterized in that, described power input interface comprises direct supply input lead and direct supply input socket.
10, a kind of method of using the described player of claim 1 to realize MP3 music under the vehicle environment is characterized in that described method may further comprise the steps:
(1) system carries out initialization operation;
(2) multimedia processing module driver card slice memory interface control module scanning card slice memory interface and memory module detect whether there is the MP3 media file;
(3) if there is no MP3 media file, then the multimedia processing module drives the display screen control module show the information that does not have file to play on display screen, and repeating step (2);
(4) if there is the MP3 media file, then the multimedia processing module reads corresponding M P3 media file and plays;
(5) the multimedia processing module is sent into the sound signal that produces in the audio frequency D/A converter module;
(6) the audio frequency D/A converter module carries out sound signal to deliver to audio output interface after the corresponding digital-to-analog conversion;
(7) the multimedia processing module receives control signal according to user's operation from control knob, and carries out corresponding playback process, play mode set handling, menu operation processing, media file copy process and media file deletion and handle.
11, the method for MP3 music under the realization vehicle environment according to claim 10 is characterized in that described playback process is:
Play, suspend broadcast respectively, stop to play, play a last head, play next, increase broadcast sound volume, reduce the operation of broadcast sound volume according to user operation.
12, the method for MP3 music under the realization vehicle environment according to claim 10 is characterized in that described play mode set handling is:
Operate the setting of carrying out single broadcast, single loop play respectively, all playing, circulate all broadcasts and shuffle pattern in proper order according to the user.
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| Application Number | Priority Date | Filing Date | Title |
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| CNA2005101122632A CN1996485A (en) | 2005-12-28 | 2005-12-28 | Vehicular insertion-card MP3 player and its playing implementation method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2005101122632A CN1996485A (en) | 2005-12-28 | 2005-12-28 | Vehicular insertion-card MP3 player and its playing implementation method |
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| CN1996485A true CN1996485A (en) | 2007-07-11 |
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| CNA2005101122632A Pending CN1996485A (en) | 2005-12-28 | 2005-12-28 | Vehicular insertion-card MP3 player and its playing implementation method |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102333244A (en) * | 2011-10-12 | 2012-01-25 | 康佳集团股份有限公司 | Moving picture experts group audio layer-3 (MP3) playing method and device for set-top box |
| CN104363415A (en) * | 2014-10-31 | 2015-02-18 | 成都远控科技有限公司 | Wireless emergency deploy and control camera |
| CN108665910A (en) * | 2016-05-31 | 2018-10-16 | 四川九鼎智远知识产权运营有限公司 | A kind of teller machines and its control method |
| CN109254939A (en) * | 2018-09-04 | 2019-01-22 | 珠海昇生微电子有限责任公司 | A kind of drive control method and system of digital analog interface |
-
2005
- 2005-12-28 CN CNA2005101122632A patent/CN1996485A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102333244A (en) * | 2011-10-12 | 2012-01-25 | 康佳集团股份有限公司 | Moving picture experts group audio layer-3 (MP3) playing method and device for set-top box |
| CN104363415A (en) * | 2014-10-31 | 2015-02-18 | 成都远控科技有限公司 | Wireless emergency deploy and control camera |
| CN108665910A (en) * | 2016-05-31 | 2018-10-16 | 四川九鼎智远知识产权运营有限公司 | A kind of teller machines and its control method |
| CN109254939A (en) * | 2018-09-04 | 2019-01-22 | 珠海昇生微电子有限责任公司 | A kind of drive control method and system of digital analog interface |
| CN109254939B (en) * | 2018-09-04 | 2020-08-04 | 珠海昇生微电子有限责任公司 | Drive control method and system of digital-analog interface |
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