CN1387137A - Universal musical player module - Google Patents
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- CN1387137A CN1387137A CN 02112283 CN02112283A CN1387137A CN 1387137 A CN1387137 A CN 1387137A CN 02112283 CN02112283 CN 02112283 CN 02112283 A CN02112283 A CN 02112283A CN 1387137 A CN1387137 A CN 1387137A
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Abstract
A universal music player module is composed of single-chip microprocessor as main controller, MP3 decoder, flash memory program memory, A/D converter, D/A converter, audio output circuit, microphone circuit for audio recording, universal serial bus interface, keyboard input interface, serial display interface, serial/parallel interface and handshaking signal interface. Its advantages are easy operation, convenient selection of display device, and simple programming for different functions.
Description
Technical field
The present invention relates to the special-purpose integrated device of a kind of basic electronics, relate in particular to a kind of universal musical player module.
Background technology
The present age, popular music player mainly contained special-purpose integrated circuit playing module, multiple music form is wherein arranged, wherein MP3 (MPEG-Audiolayer-3) is a kind of modal form, it is a MPEG (Moving Picture Experts Group motion picture expert group, be an audiovisual standardization body) a kind of high performance acoustic coding form formulated, the most popular a kind of music file Internet era of being present, compression ratio height (can be compressed to former cd cd Compact Disk formatted file size 1/2), reduction tonequality is good, can be very near CD Quality.
Playback MP3 music mainly contains the computing machine pure software and plays and two kinds of methods of hardware decoding MP3 music player, and the pure software broadcast must be fixed against computing machine and just can play, so can not appreciate whenever and wherever possible.And hardware decoding MP3 music player is a kind of portable player, and it can make ultra-small volume, is easy to carry, and uses easy to operately, has obtained significant progress.It can be by being connected with PC, finish the MP3 song download, delete, upload, by the player button, can finish music, selected songs, stop, function such as volume adjusting, model selection, recording.
And Portable MP 3 music player in the market, its production, method for designing, it all is the manufacturer of MP3 music player, the technical parameter of this decoding chip that provides according to the production firm of certain MP3 decoding chip, application process, program command etc. are developed, are designed in conjunction with main control singlechip and related peripheral circuit.The design engineer must have suitable experience, on the basis of the technical parameter of fully understanding this decoding chip, control method, art of programming, is familiar with the technical protocol relevant with MP3; Also must have dedicated emulated developing instrument, and must spend a large amount of energy and do scheme and type selecting, planning, hardware circuit design, PCB design, Control Software programming, debugging, the construction cycle is long, difficulty is big, expense is high.For the producer of amateur slip-stick artist and short run application, be difficult to directly realize.In addition, existing MP3 music player on the market no matter be producer or final user, all is difficult to do flexible change according to real needs.
Summary of the invention
Purpose of the present invention, be to provide a kind of universal musical player module, use this module, the user does not need special-purpose developing instrument, also need not grasp the knowledge relevant with MP3, as long as have the programming knowledge of general single-chip microcomputer, just at short notice autonomous Design develop have the MP3 music, the band sound-recording function, numerous products of his specific function are arranged again.
The object of the present invention is achieved like this, and this universal musical player module comprises single-chip microcomputer governor circuit, MP3 decoding device circuit, FLASH memory, memory under program, analog to digital conversion circuit, D/A converting circuit, audio output circuit, microphone location circuit, USB (universal serial bus), keyboard input interface and serial display interface; Described single-chip microcomputer governor circuit and MP3 decoding device circuit, FLASH memory and memory under program input and output interconnection; The input end of one output terminal linking number analog conversion circuit of described MP3 decoding device circuit; Its input end connects the output terminal of analog to digital conversion circuit, and the output terminal of described D/A converting circuit connects the input end of audio output circuit; The input end of described analog to digital conversion circuit connects the output terminal of microphone location circuit, described USB (universal serial bus), keyboard input interface and serial display interface all link to each other with the single-chip microcomputer governor circuit, it is characterized in that: also comprise serial/parallel line interface and handshake interface; Described serial/parallel line interface links to each other with the single-chip microcomputer governor circuit with the handshake interface; Described serial line interface is connected to form by the 45th, 46 pin of U51 on plug receptacle J1 and the single-chip microcomputer governor circuit; Described parallel interface is connected to form by the 55th～61,63 pin of U51 on plug receptacle J2 and the single-chip microcomputer governor circuit; Described handshake interface is connected to form by the 18th, 20,22,24 pin of U51 on resistance R 512, R513, R514, R515 and the single-chip microcomputer governor circuit by plug receptacle J2.
Described keyboard input interface is by plug receptacle J4, resistance R 28, R29, R210, R211, and the 4th, 6,8,10,63,64,74,77,79 pin by U51 on button K1～K9 and the single-chip microcomputer governor circuit connect to form; Wherein, the 4th, 6,8,10 pin of U51 are defined as the horizontal scanning line of keyboard matrix, and the 63rd, 64,74,77,79 pin of U51 are defined as the column scan line of keyboard matrix.
Described serial display interface is connected to form by the 48th, 49,51,52 pin of U51 on plug receptacle J3 and the single-chip microcomputer governor circuit by integrated circuit (IC) chip H1, LCDs YJ1.
Described memory under program circuit is connected to form by the 1st, 3,5,7,9,11,14,17,26,29,31,33,42,44,47,50 pin of U51 in integrated circuit (IC) chip U52, U53 and the single-chip microcomputer governor circuit, and wherein U53 is used for latch data.
Described D/A converting circuit is connected with the 26th, 27,28 pin of U71 in the MP3 decoding device circuit by integrated circuit (IC) chip U41, and connects to form with capacitor C 41, C42, C43.
The 55th～61,63 pin of U51 are defined as R_D0-R_D7 eight bit parallel communication ports on the described single-chip microcomputer governor circuit, and wherein the R_D7 position is that the position is selected in MP3 record/playback, and seven of R_D0-R_D6 are used for selected songs, information concerning order is passed on, and the agreement regulation is as follows:
Low level is effective during operation, and each order must keep just thinking effective order more than 100 milliseconds;
0XFF (1,111 1111): waiting status, no operational order;
0X00 (0,000 0000): " stopping " order;
0X01 (0,000 0001): " volume increase " order;
0X02 (0,000 0010): " volume minimizing " order;
0X03 (0,000 0011): " recording beginning " order;
0X04 (0,000 0100): " model selection " order;
0X08-0XFE: the broadcast that is respectively applied for the 1st to the 120th first song (recording).
The 45th, 46 pin of U51 are defined as RXD, TXD serial communication port on the described single-chip microcomputer governor circuit, adopt the serial asynchronous communication mode, and baud rate is set at 2400BIT/S, 8 bit data sign indicating numbers, and the numeric data code agreement is identical with the parallel communications mouth.
The 18th, 20,22,24 pin of U51 are defined as handshake on the described single-chip microcomputer governor circuit, and its signal is respectively:
A, " can not carry out " signal (N_CMD): be low level usually, after receiving the illegal command that can not carry out, this mouthful provides 100 milliseconds high level;
B, " recording is full " signal (REC_FULL): memory space is arranged, and this mouth is a low level, and after recording was full, this mouth became high level;
C, " broadcast " signal (STATUS): be low level usually, after receiving effective play signal, this mouth becomes high level by low level, plays up to this song and finishes back recovery low level;
D, " effective order " signal (KEY_STATUS): be low level usually, after receiving an effective order, this mouthful provides one 100 milliseconds high level signal.
In the described single-chip microcomputer governor circuit the 48th, 49,51,52 pin of U51 be defined as serial display interface signals/WR ,/RD, DADA, STB, H1 cooperates with lcd drive chip, be used to drive LCDs, and reserve standby with the form of display interface plug receptacle.
U51 in the described single-chip microcomputer governor circuit is SPCA514A; H1 in the described Serial Display Circuit is HT1621; U71 in the described MP3 decoding device circuit is SPCA751A; U52 in the described memory under program circuit is that AM29LV010, U53 are 74HC573; U41 in the described D/A converting circuit is MS6313.
Because the present invention has adopted above technical scheme, this player module has following remarkable advantage and characteristics:
1, universal musical player module of the present invention the is integrated download of songs relevant with the MP3 player, delete, upload, function such as broadcast, selected songs, volume are controlled, stop, recording playback sound, USB (universal serial bus) is arranged, can with the PC on-line communication;
2, universal musical player module of the present invention has general serial, parallel control interface, and design has handshake, and all functions can be controlled by external circuit easily;
3, universal musical player module of the present invention is provided with the keyboard input interface, can directly adopt the button complete operation;
4, universal musical player module of the present invention is provided with the serial display interface, can select only display device according to application requirements, as LCDs, fluorescent display screen (VFD), charactron etc.;
5, use universal musical player module of the present invention, the user does not need special-purpose developing instrument, also need not grasp the knowledge relevant with MP3, as long as the programming knowledge of general single-chip microcomputer is arranged, just can design in a short period of time have the MP3 music, the band sound-recording function, numerous products of his specific function are arranged again.
Description of drawings
Fig. 1 is the functional-block diagram of universal musical player module of the present invention;
Fig. 2, Fig. 3 are the circuit theory diagrams of universal musical player module of the present invention;
Fig. 4 is the main program flow chart of universal musical player module of the present invention.
Embodiment
Referring to Fig. 1, universal musical player module of the present invention comprises single-chip microcomputer governor circuit, MP3 decoding device circuit, FLASH memory, memory under program, analog to digital conversion circuit, D/A converting circuit, audio output circuit, microphone location circuit, USB (universal serial bus), keyboard input interface and serial display interface; Single-chip microcomputer governor circuit and MP3 decoding device circuit, FLASH memory and memory under program input and output interconnection; The input end of one output terminal linking number analog conversion circuit of MP3 decoding device circuit; Its input end connects the output terminal of analog to digital conversion circuit; The output terminal of D/A converting circuit connects the input end of audio output circuit; The input end of analog to digital conversion circuit connects the output terminal of microphone location circuit, and USB (universal serial bus), keyboard input interface and serial display interface all link to each other with the single-chip microcomputer governor circuit, and this module also comprises serial/parallel line interface and handshake interface; Serial/parallel line interface links to each other with the single-chip microcomputer governor circuit with the handshake interface; Serial line interface is connected to form by the 45th, 46 pin of U51 on plug receptacle J1 and the single-chip microcomputer governor circuit; Parallel interface is connected to form by the 55th～61,63 pin of U51 on plug receptacle J2 and the single-chip microcomputer governor circuit; The handshake interface is connected to form by the 18th, 20,22,24 pin of U51 on resistance R 512, R513, R514, R515 and the single-chip microcomputer governor circuit by plug receptacle J2.
Referring to Fig. 2, Fig. 3, the circuit in the universal musical player module of the present invention comprises: single-chip microcomputer governor circuit A, MP3 decoding device circuit B, FLASH memory circuit C, memory under program circuit D, analog to digital conversion circuit, D/A converting circuit E, audio output circuit F, microphone location circuit G, USB (universal serial bus) H, keyboard input interface I, serial line interface J, parallel interface K, handshake interface L and serial display interface M.
Single-chip microcomputer governor circuit A comprises main control singlechip U51, in single-chip microcomputer governor circuit A, connects to form reset circuit A1 by the 88th pin of capacitor C 51, resistance R 58, R59, R510, diode D51 and triode Q51 and main control singlechip U51; The 37th, 38 pin by capacitor C 55, C56 and crystal oscillator Y51 and main control singlechip U51 connect to form clock oscillation circuit A2; The 32nd pin by switch S 1 and main control singlechip U51 connects to form display mode selection circuit A3, switch S 1 unsettled employing liquid crystal display, then the output of the 48th of U51 the, 49,51,52 pin is liquid crystal driving signal, and external a slice HT1621 can drive LCDs; Ground connection selection adopts the VFD video screen to show, then the output of the 48th of U51 the, 49,51,52 pin is the VFD display drive signals, and external a slice AD16312 can drive fluorescent display screen.
MP3 decoding device circuit B comprises an integrated circuit (IC) chip U71, in MP3 decoding device circuit B, connects to form clock oscillation circuit B1 by the 39th, 40 pin of capacitor C 73, C74, resistance R 71 and crystal oscillator Y71 and U71; The 1st, 2,3,4,5,12,13,44 pin of U71 are connected with the 80th, 78,80,82,76,75,72,84 pin of U51 among the single-chip microcomputer governor circuit A respectively.
FLASH storage circuit C is connected to form by resistance R 51 among the identical integrated circuit (IC) chip U31 of two block structures, U32 parallel connection and the single-chip microcomputer governor circuit A and the 2nd, 41,43,85,87,89,92,95,97 pin of U51, and wherein the 85th pin (SM_CEN) of U51 remains for the extended multimedia card in advance.
Memory under program circuit D is connected to form by the 1st, 3,5,7,9,11,14,17,26,29,31,33,42,44,47,50 pin of U51 among integrated circuit (IC) chip U52, U53 and the single-chip microcomputer governor circuit A, and wherein U53 is used for latch data.
Analog to digital conversion circuit is the built-in circuit of U71 among the MP3 decoding circuit B, and its input end is the 34th, 35,36 pin of U71 among the MP3 decoding circuit B.
D/A converting circuit E is connected with the 26th, 27,28 pin of U71 among the MP3 decoding device circuit B by integrated circuit (IC) chip U41, and connects to form with capacitor C 41, C42, C43.
Audio output circuit F is connected to form by integrated circuit (IC) chip U42 and capacitor C 44, C45, C46, C47, resistance R 46 and receiver J-Horner P41.And the 3rd pin by U42 is connected with capacitor C 41 among the D/A converting circuit E.
Microphone location circuit G is connected to form by the 34th, 35,36 pin of U71 among resistance R 81～R87, capacitor C 71, C72, C81～C84, microphone M81 and the MP3 decoding circuit B.
USB (universal serial bus) H is connected to form by the 67th, 68,86 pin of U51 among plug receptacle J9, resistance R 53, R54, R91, R92, R93, diode D91, D92 and the single-chip microcomputer governor circuit A.
Keyboard input interface I is connected to form by plug receptacle J4, resistance R 28, R29, R210, R211, the 4th, 6,8,10,62,64,74,77,79 pin by U51 among button K1～K9 and the single-chip microcomputer governor circuit A.Wherein, the 4th, 6,8,10 pin of U51 are defined as the horizontal scanning line of keyboard matrix, and the 63rd, 64,74,77,79 pin of U51 are defined as the column scan line of keyboard matrix.
Serial line interface J is connected to form by the 45th, 46 pin of U51 among plug receptacle J1 and the single-chip microcomputer governor circuit A;
Parallel interface K is connected to form by 55-61,63 pin of U51 among plug receptacle J2 and the single-chip microcomputer governor circuit A.
USB (universal serial bus) H is used for communicating by letter with PC.
Serial line interface J is used for being connected with outside other master cpu with parallel interface K.
Handshake interface L is connected to form by the 18th, 20,22,24 pin of U51 among resistance R 512～R515 and the single-chip microcomputer governor circuit A by plug receptacle J2.
Serial display interface M is connected to form by the 48th, 49,51,52 pin of U51 among plug receptacle J3 and the single-chip microcomputer governor circuit A by integrated circuit (IC) chip H1, LCDs YJ1.
The software section of musical player module of the present invention comprises master routine, USB interface agreement, FLASH Data Transport Protocol, MP3 decoding control, serial/parallel capable port communications agreement, display driving software, keyboard loading routine.
Main program flow chart wherein sees also Fig. 4, after master routine starts, promptly the 32nd pin of U51 among the single-chip microcomputer governor circuit A is judged through initialization, if be low level, then call the VFD display driving software, by the 48th, 49,51, the 52 pin output VFD display drive signals of U51; If be high level, then call the liquid crystal display driver, by the 48th, 49,51, the 52 pin output liquid crystal display drive signal of U51; Program then judgement has or not the USB (universal serial bus) signal, if any the USB (universal serial bus) signal, then changeing the USB (universal serial bus) subroutine carries out, as there is not a USB (universal serial bus) signal, program is then followed judgement and is had or not keyboard input signal, if any keyboard input signal, then the turn key dish is handled the subroutine execution, as the on-keyboard input signal, program is then followed judgement and is had or not the parallel interface signal, if any the parallel interface signal, then changes parallel interface and handles the subroutine execution, as there is not a parallel interface signal, then program is then judged and is had or not the serial line interface signal, if any the serial line interface signal, then changes serial line interface and handles subroutine and carry out, as do not have the serial line interface signal, then turn back to the USB (universal serial bus) signal is judged.
The 55th～61,63 pin of U51 are defined as R_D0-R_D7 eight bit parallel communication ports and are used for communicating by letter with external circuit among the single-chip microcomputer governor circuit A of universal musical player module of the present invention, wherein the R_D7 position is that the position is selected in MP3 record/playback, the MP3 song is represented to play for low level in this position, for high level is then operated recording substance; Seven of R_D0-R_D6 are used for selected songs, information concerning order is passed on, and the agreement regulation is as follows:
Low level is effective during operation, and each order must keep just thinking effective order more than 100 milliseconds;
0XFF (1,111 1111): waiting status, no operational order;
0X00 (0,000 0000): " stopping " order;
0X01 (0,000 0001): " volume increase " order;
0X02 (0,000 0010): " volume minimizing " order;
0X03 (0,000 0011): " recording beginning " order;
0X04 (0,000 0100): " model selection " order; Be used for the selection of MP3 decoding device voice codec pattern, have " normally ", " jazz ", " rock and roll ", " Doby ", " popular ", " classics " isotype to select in the present embodiment for circulation;
0X08-0XFE: the broadcast that is respectively applied for the 1st to the 120th first song (recording).
The 45th, 46 pin of U51 are defined as RXD respectively among the single-chip microcomputer governor circuit A of universal musical player module of the present invention, the TXD serial communication port is used for communicating by letter with external circuit, adopt the serial asynchronous communication mode, baud rate is set at 2400BIT/S, 8 bit data sign indicating numbers, the numeric data code agreement is identical with the parallel communications mouth.Host computer at first sends call signal " 05H " when sending data, if agreement receives then postbacks " 06H ", temporarily can not receive otherwise send out " 07H " expression.Host computer only just can send the control code signal when receiving this module answer signal " 06H ".If the song of control surpasses 120 head, serial data bitstream is expanded to 16, with regard to the broadcast of may command first songs up to ten thousand.
Main control singlechip U51 design among the single-chip microcomputer governor circuit A of universal musical player module of the present invention has four I/O ports (the 18th, 20,22,24 pin of U51) to be used for doing handshake with external circuit, and its signal is respectively:
A, " can not carry out " signal (N_CMD): be low level usually, after receiving the illegal command that can not carry out, this mouthful provides 100 milliseconds high level;
B, " recording is full " signal (REC_FULL): memory space is arranged, and this mouth is a low level, and after recording was full, this mouth became high level;
C, " broadcast " signal (STATUS): be low level usually, after receiving effective play signal, this mouth becomes high level by low level, plays up to this song and finishes back recovery low level;
D, " effective order " signal (KEY_STATUS): be low level usually, after receiving an effective order, this mouthful provides one 100 milliseconds high level signal.
Among the single-chip microcomputer governor circuit A of universal musical player module of the present invention the 48th, 49,51 pin of U51 be defined as serial display interface signals/WR ,/RD, DADA, STB, H1 cooperates with lcd drive chip, be used to drive the serial display screen, adopt the form of display interface plug receptacle to select to use for the user.H1 directly group fixes on the back of the body printed panel of serial display screen, plugs when needing to show to get final product.
Universal musical player module of the present invention is built-in with fluorescent display screen (VFD) display driver information, if adopt VFD to show, with the 32nd pin ground connection of U51, then the output of the 48th, 49,51,52 pin is exactly the VFD display control signal.
Universal musical player module function of the present invention is many, rich interface, use and to carry out secondary development all very convenient, except that can directly being designed to the Portable MP 3 music player, if add time control circuit, can form and be with time-controlled high tone quality automatic music to play instrument, can be used for self-timings such as school, army, unit and ring a bell, broadcast usefulness; Increase different master control borads in addition and can constitute high tone quality public transport station reporting instrument, high tone quality electronic cicerone machine etc.During with the MP3 decoding chip of WMA (Windows Medio Ausio), AAC (AdvancedAudio Coding) compressed format, this module can be used for playing WMA, AAC form music file simultaneously in selecting sheet for use.
Claims (10)
1, a kind of universal musical player module, this module comprise single-chip microcomputer governor circuit, MP3 decoding device circuit, FLASH memory, memory under program, analog to digital conversion circuit, D/A converting circuit, audio output circuit, microphone location circuit, USB (universal serial bus), keyboard input interface and serial display interface; Described single-chip microcomputer governor circuit and MP3 decoding device circuit, FLASH memory and memory under program input and output interconnection; The input end of one output terminal linking number analog conversion circuit of described MP3 decoding device circuit; Its input end connects the output terminal of analog to digital conversion circuit, and the output terminal of described D/A converting circuit connects the input end of audio output circuit; The input end of described analog to digital conversion circuit connects the output terminal of microphone location circuit, described USB (universal serial bus), keyboard input interface and serial display interface all link to each other with the single-chip microcomputer governor circuit, it is characterized in that: also comprise serial/parallel line interface and handshake interface; Described serial/parallel line interface links to each other with the single-chip microcomputer governor circuit with the handshake interface; Described serial line interface is connected to form by the 45th, 46 pin of U51 on plug receptacle J1 and the single-chip microcomputer governor circuit; Described parallel interface is connected to form by the 55th～61,63 pin of U51 on plug receptacle J2 and the single-chip microcomputer governor circuit; Described handshake interface is connected to form by the 18th, 20,22,24 pin of U51 on resistance R 512, R513, R514, R515 and the single-chip microcomputer governor circuit by plug receptacle J2.
2, a kind of universal musical player module according to claim 1, it is characterized in that: described keyboard input interface is by plug receptacle J4, resistance R 28, R29, R210, R211, and the 4th, 6,8,10,63,64,74,77,79 pin by U51 on button K1～K9 and the single-chip microcomputer governor circuit connect to form; Wherein, the 4th, 6,8,10 pin of U51 are defined as the horizontal scanning line of keyboard matrix, and the 63rd, 64,74,77,79 pin of U51 are defined as the column scan line of keyboard matrix.
3, a kind of universal musical player module according to claim 1 is characterized in that: described serial display interface is connected to form by the 48th, 49,51,52 pin of U51 on plug receptacle J3 and the single-chip microcomputer governor circuit by integrated circuit (IC) chip H1, LCDs YJ1.
4, a kind of universal musical player module according to claim 1, it is characterized in that: described memory under program circuit is connected to form by the 1st, 3,5,7,9,11,14,17,26,29,31,33,42,44,47,50 pin of U51 in integrated circuit (IC) chip U52, U53 and the single-chip microcomputer governor circuit, and wherein U53 is used for latch data.
5, a kind of universal musical player module according to claim 1, it is characterized in that: described D/A converting circuit is connected with the 26th, 27,28 pin of U71 in the MP3 decoding device circuit by integrated circuit (IC) chip U41, and connects to form with capacitor C 41, C42, C43.
6, a kind of universal musical player module according to claim 1, it is characterized in that: the 55th～61,63 pin of U51 are defined as R_D0-R_D7 eight bit parallel communication ports on the described single-chip microcomputer governor circuit, wherein the R_D7 position is that the position is selected in MP3 record/playback, seven of R_D0-R_D6 are used for selected songs, information concerning order is passed on, and the agreement regulation is as follows:
Low level is effective during operation, and each order must keep just thinking effective order more than 100 milliseconds;
0XFF (1,111 1111): waiting status, no operational order;
0X00 (0,000 0000): " stopping " order;
0X01 (0,000 0001): " volume increase " order;
0X02 (0,000 0010): " volume minimizing " order;
0X03 (0,000 0011): " recording beginning " order;
0X04 (0,000 0100): " model selection " order;
0X08-0XFE: the broadcast that is respectively applied for the 1st to the 120th first song (recording).
7, a kind of universal musical player module according to claim 1, it is characterized in that: the 45th, 46 pin of U51 are defined as RXD, TXD serial communication port on the described single-chip microcomputer governor circuit, adopt the serial asynchronous communication mode, baud rate is set at 2400BIT/S, 8 bit data sign indicating numbers, the numeric data code agreement is identical with the parallel communications mouth.
8, according to claim 1 or 3 described a kind of universal musical player modules, it is characterized in that: the 18th, 20,22,24 pin of U51 are defined as handshake on the described single-chip microcomputer governor circuit, and its signal is respectively:
A, " can not carry out " signal (N_CMD): be low level usually, after receiving the illegal command that can not carry out, this mouthful provides 100 milliseconds high level;
B, " recording is full " signal (REC_FULL): memory space is arranged, and this mouth is a low level, and after recording was full, this mouth became high level;
C, " broadcast " signal (STATUS): be low level usually, after receiving effective play signal, this mouth becomes high level by low level, plays up to this song and finishes back recovery low level;
D, " effective order " signal (KEY_STATUS): be low level usually, after receiving an effective order, this mouthful provides one 100 milliseconds high level signal.
9, according to claim 1 or 3 described a kind of universal musical player modules, it is characterized in that: in the described single-chip microcomputer governor circuit the 48th, 49,51,52 pin of U51 be defined as serial display interface signals/WR ,/RD, DADA, STB, H1 cooperates with lcd drive chip, be used to drive LCDs, and reserve standby with the form of display interface plug receptacle.
10, a kind of universal musical player module according to claim 8 is characterized in that: the U51 in the described single-chip microcomputer governor circuit is SPCA514A; H1 in the described Serial Display Circuit is HT1621; U71 in the described MP3 decoding device circuit is SPCA751A; U52 in the described memory under program circuit is that AM29LV010, U53 are 74HC573; U41 in the described D/A converting circuit is MS6313.
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| Application Number | Priority Date | Filing Date | Title |
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| CNB021122830A CN100354854C (en) | 2002-06-28 | 2002-06-28 | Universal musical player module |
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| CNB021122830A CN100354854C (en) | 2002-06-28 | 2002-06-28 | Universal musical player module |
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| CN1387137A true CN1387137A (en) | 2002-12-25 |
| CN100354854C CN100354854C (en) | 2007-12-12 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101425005B (en) * | 2007-10-31 | 2011-03-23 | 鸿富锦精密工业（深圳）有限公司 | Audio circuit for motherboard |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN2065778U (en) * | 1989-12-22 | 1990-11-14 | 中国科学院海洋研究所 | Universal logic analyzer |
| GB0005316D0 (en) * | 2000-03-07 | 2000-04-26 | Memory Corp Tech Ltd | High-speed interface for audio player device |
| CN2418520Y (en) * | 2000-03-31 | 2001-02-07 | 上海广电（集团）有限公司 | Portable digital music-player |
| CN2558009Y (en) * | 2002-06-28 | 2003-06-25 | 上海奔流电子有限公司 | Universal music player module |
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| CN101425005B (en) * | 2007-10-31 | 2011-03-23 | 鸿富锦精密工业（深圳）有限公司 | Audio circuit for motherboard |
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