CN102005227B - Embedded CD acoustic stereo WAVE player - Google Patents
Embedded CD acoustic stereo WAVE player Download PDFInfo
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- CN102005227B CN102005227B CN2010105882522A CN201010588252A CN102005227B CN 102005227 B CN102005227 B CN 102005227B CN 2010105882522 A CN2010105882522 A CN 2010105882522A CN 201010588252 A CN201010588252 A CN 201010588252A CN 102005227 B CN102005227 B CN 102005227B
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Abstract
The invention discloses an embedded CD acoustic stereo WAVE player, which comprises a micro control unit (MCU) singlechip, four operational amplifiers, an audio output port and a secure digital/multi media card (SD/MMC) cassette. The MCU singlechip is matched with resistors and capacitors and connected with the four operational amplifiers; the four operational amplifiers are matched with resistors and capacitors and connected with the audio output port; the SD/MMC cassette is connected with the MCU singlechip through a serial peripheral interface (SPI) data wire; and the MCU singlechip reads a digital audio source file on an SD/MMC card through the SD/MMC cassette and transmits digital audio data to the four operational amplifiers, the digital audio data are converted into analog audio signals by a circuit consisting of the four operational amplifiers, the resistors and the capacitors, high-frequency noise is filtered, and the analog audio signals are output through the audio output port. The player has the advantages of low hardware cost, capability of realizing high-quality CD acoustic stereo analog audio signal output, flexible expansion function and convenience for embedded application.
Description
Technical field
The present invention relates to DAB and play application, relate in particular to the stereo WAVE player of a kind of embedded type C D tonequality.
Background technology
DAB is a kind of technology of utilizing the digitizing means that sound is recorded, deposits, edits, compressed or plays, and it is along with Digital Signal Processing, computer technology, Development of Multimedia Technology and a kind of brand-new acoustic processing means that form.Along with the widespread use of digital audio technology in TV, broadcasting, mobile phone, MP3; Also begin progressively to adopt digital audio technology in the system of many band voice suggestion classes; Elevator voice arrival gong for example, products such as instrument with voice prompts such as public bus voice automatic stop reporter, equipment.
The realization DAB is play and adopted two kinds of technological means usually in this type used at present: a kind of is the integrated digital speech chip that adopts special use, is exactly the technology that adopts the MP3 player in addition.All there is certain deficiency in these two kinds of methods, and it is mainly reflected in realizes playing the imbalance on high-quality digital audio and the cost price.The technology of MP3 player can reach high-quality DAB result of broadcast, but needs to use special MP3 decoding device and 16 DAC converter, realizes all more complicated of technology and algorithm, and cost is also just higher relatively; And special-purpose integrated digital speech chip is relatively cheap, but can only realize the quality (SF 22.1KHz, 12 of resolution) near the broadcast level DAB usually.
The present invention overcomes the above defective of prior art; Provide a kind of embedded type C D tonequality stereo WAVE player; It is low to have the cost of realization; Output reaches the high-quality audio signal of CD Quality, is prone to the expansion use and is embedded into needs easily use voice, the system of music and the beneficial effect in the equipment.
Summary of the invention
The invention provides the stereo WAVE player of a kind of embedded type C D tonequality, comprise MCU single-chip microcomputer, four-operational amplifier, audio output port and SD/MMC deck four parts.Said MCU single-chip microcomputer (1) cooperates resistance, electric capacity to be connected with four-operational amplifier (2); Said four-operational amplifier (2) cooperates resistance, electric capacity to be connected with audio output port (3); Said MCU single-chip microcomputer (1) reads the DAB source file on the SD/MMC card through SD/MMC deck (4); Digital audio-frequency data is transferred to four-operational amplifier (2); The circuit of forming through four-operational amplifier (2) and resistance, electric capacity is transformed into simulated audio signal and filter away high frequency noise, exports via audio output port (3).
Wherein, it is to be connected with two input ends of four-operational amplifier that said MCU single-chip microcomputer cooperates resistance, electric capacity, and two output terminals of said four-operational amplifier cooperate resistance, electric capacity to be connected with audio output port.Said SD/MMC deck is connected with the MCU single-chip microcomputer through the SIP data line.
Among the present invention, said MCU single-chip microcomputer is working clock frequency is integrated with SPI interface and four 8 PWM output ports greater than 24MHz, inside a general MCU single-chip microcomputer.
Among the present invention, inner integrated four operational amplifiers independently of four-operational amplifier have four tunnel inputs and export with four the tunnel.
Among the present invention, four 8 PWM output ports of said MCU single-chip microcomputer are connected through resistance, electric capacity with said four-operational amplifier respectively, constitute hybrid 16 DAC of two-way weighting resistor/PWM, realize 16 DA conversions of left and right acoustic channels.
Among the present invention, said MCU single-chip microcomputer is connected with the SD/MMC deck through the SPI data line, is used for reading the digital audio file of SD/MMC card.
Among the present invention; Four 8 PWM output ports of said MCU single-chip microcomputer respectively with four-operational amplifier in the input end of two operational amplifiers be connected through resistance, electric capacity; Constitute hybrid 16 DAC of two-way weighting resistor/PWM, realize 16 DA conversions of left and right acoustic channels.Two other operational amplifier in the four-operational amplifier and resistance, electric capacity combination constitute the two-way low-pass filter, realize the filtering to the high frequency noise in the simulating signal, and the stereo simulating signal of outputting high quality simulation CD Quality is to audio output port.
The DAB source file of SD/MMC deck reading and recording on the SD/MMC card that MCU single-chip microcomputer among the present invention connects through the SPI data line; Then the digital audio-frequency data that obtains is outputed to four-operational amplifier through four PWM mouths; Convert simulated audio signal to through hybrid 16 DAC of weighting resistor/PWM; After passing through the low pass filter filters out high frequency noise again, export via audio output port.
Among the present invention, said audio output port (3) is an earphone socket.
The present invention also comprises button, LED light, and wherein, said button is connected with the MCU single-chip microcomputer, is used for the choosing of the song of the SD/MMC card in the SD/MMC deck (4) is broadcast and broadcast is controlled.Said LED light is connected with the MCU single-chip microcomputer, in order to the duty of indication player.
The present invention also comprises communication interface, and said communication interface is connected with the MCU single-chip microcomputer, is used to connect stereo WAVE player of said embedded type C D tonequality and external system, constitutes the system of band voice broadcast function, realizes control and function expansion.
Among the present invention, said " CD Quality " is meant SF 44.1KHz, 16 of sampling precisions, the digitized audio quality standard of left and right sides stereophony.
Among the present invention; Said " WAVE " is meant that digital audio-frequency data meets RIFF standard (RIFF is the abbreviation of English Resource Interchange File Format), with the WEVE file (default file expansion wav by name) of original pulse coded modulation (PCM) form keeping records.
The present invention can use separately; Also can embed and be combined in the different application systems with the external system ways of connecting through communication interface; Make full use of the function and the pin of MCU singlechip, realize the expansion of player function and the broadcast of high tone quality WAVE DAB.
At first, the SD/MMC deck of the present invention through connecting directly reads digital audio file on the SD/MMC card that inserts deck.Because what read is the WAVE format digital voice data of original nothing compression and coding, has guaranteed the most original digital audio quality, does not also just need dedicated decoders.Secondly, with the PWM function of MCU single-chip microcomputer itself, hybrid 16 DAC of the weighting resistor/PWM that cooperates cheap operational amplifier to constitute replace 16 special-purpose ADC converters; Once more, realize that player function only consumes to have used MCU single-chip microcomputer Limited resources itself to also have rich resource and the pin can its usefulness, can realize that function expansion and embedding are combined in other system, constitute other system that is with voice play function.
The stereo WAVE player of embedded type C D tonequality of the present invention; Do not need dedicated decoders and special-purpose 16 ADC converters; Only adopt two general-purpose devices and simple peripheral circuit: the general MCU single-chip microcomputer of a slice, the common four-operational amplifier of a slice; Constitute 16 DAC circuit with resistance capacitance; Cooperate corresponding program code to handle, realization is read high-quality WAVE digital audio file and is cooperated the simple analog circuit through 8 PWM modes, realizes that 16 DAC are converted to the output of high-quality simulated audio signal.Cost of manufacture of the present invention is extremely low, output high tone quality audio frequency, and make things convenient for the function expansion.The present invention both can constitute independently player and use, and also can carry out secondary development, was embedded in other application system, was fit to very much equipment and occasions such as needs voice broadcast such as traffic, tourism, market, elevator, intelligence instrument and prompting.
Description of drawings
Fig. 1 is the electrical block diagram of the stereo WAVE player of embedded type C D tonequality of the present invention;
Fig. 2 is the principle of work synoptic diagram of the stereo WAVE player of embedded type C D tonequality of the embodiment of the invention 1;
Fig. 3 is the principle of work synoptic diagram of the stereo WAVE player of embedded type C D tonequality of the embodiment of the invention 2.
Embodiment
Further set forth the present invention in detail below in conjunction with accompanying drawing and embodiment.Following examples are not limitation of the present invention.Under spirit that does not deviate from inventive concept and scope, variation and advantage that those skilled in the art can expect all are included among the present invention.
Embodiment 1:
With reference to figure 1, shown in Figure 2,1 is the MCU single-chip microcomputer, and 2 is four-operational amplifier, and 3 is audio output port, and 4 is the SD/MMC deck, and 6 is button, and 7 is LED light.
The stereo WAVE player of embedded type C D tonequality of the present invention comprises MCU single-chip microcomputer 1, four-operational amplifier 2, audio output port 3 and SD/MMC deck 4; In addition, also comprise button 6 and LED light 7.
Wherein, MCU single-chip microcomputer 1 cooperates resistance, electric capacity to be connected with two input ends of four-operational amplifier 2; Two output terminals of four-operational amplifier 2 cooperate resistance, electric capacity to be connected with audio output port 3; SD/MMC deck 4 is connected with MCU single-chip microcomputer 1 through the SPI data line; Button 6 is connected with MCU single-chip microcomputer 1, and the selected songs and the broadcast of player are controlled; LED light is connected with MCU single-chip microcomputer 1, in order to the duty of indication player.
MCU single-chip microcomputer 1 among the present invention is integrated with the general MCU single-chip microcomputer of hardware SPI interface and four 8 PWM output ports greater than 24MHZ, inside for working clock frequency; Its SPI interface is connected with SD/MMC deck 4; Four 8 PWM output ports and four-operational amplifier 2 are connected through resistance, electric capacity; Constitute hybrid 16 DAC of two-way weighting resistor/PWM; Realize accomplishing the conversion of 16 DA of two-way left and right acoustic channels, the stereo audio of outputting high quality simulation CD Quality.
MCU single-chip microcomputer 1 uses general MCU chip M0516 in the present embodiment, and four-operational amplifier 2 uses common four-operational amplifier chip LM324; Audio output port 3 adopts 3 general core Φ 3.5mm earphone sockets; SD/MMC deck 4 adopts the SD/MMC deck of standard universal.Audio output port 3 also can be the socket of external stereo set.
As shown in Figure 1, the three-way SPI interface of MCU single-chip microcomputer 1 is connected with SD/MMC deck 4 corresponding pins with two I/O mouths (P0.4/P0.5/P0.6/P4.6/P4.7), constitutes the physical interface of reading the SD/MMC card; Four 8 PWM delivery outlet P2.3/P2.4/P2.6/P2.7 of MCU single-chip microcomputer 1 cooperate six resistance and four electric capacity to be connected with two amplifier input ends in the four-operational amplifier 2; Two-way weighting resistor/PWM mixing DAC the circuit that constitutes is realized the function that 16 DAC of two-way change.The output of 16 DAC of two-way is connected to two other amplifier and four resistance and four the electric capacity formation two-way active low-pass filters in the four-operational amplifier 2, realizes filter away high frequency noise.Two-way low-pass filter output terminal is connected to the sound signal of audio output port 3 output high tone qualities.
The work clock of MCU single-chip microcomputer M0516 is 24MHz, can directly smooth through the SPI interface, sequentially read SF on the SD/MMC card that is inserted in the SD/MMC deck 4 and be 44.1KHz, resolution and be the DAB audio files of CD Quality 16, left and right acoustic channels two-way, standard WAVE form; MCU single-chip microcomputer M0516 is through the processing of software then; Again two-way 16 bit digital voice datas (data of each point are 84 bytes) are divided into high least-significant byte; By the frequency multiplication frequency of MCU single-chip microcomputer 1 with 44.1KHz or 44.1KHz; Through the pin of self four 8 PWM mouth, output to two input ends of the LM324 of four-operational amplifier 2 with the mode of PWM; Wherein the output of two 8 pwm signals constitutes hybrid 16 DAC of 1 road weighting resistor/PWM with a amplifier in the four-operational amplifier, two 8 pwm signals in addition export and four-operational amplifier LM324 in another amplifier constitute hybrid 16 DAC of the second road weighting resistor/PWM; Be connected respectively to audio output port after the low-pass filter circuit that the simulating signal of 16 DAC outputs of two-way is formed through two amplifiers of residue among the four-operational amplifier LM324 again filters out high frequency noise, just obtained the analogue audio frequency output signal of high tone quality at audio output port like this.
In the present embodiment, button 6 is to be used for selected songs and the broadcast of the SD/MMC card that inserts SD/MMC deck 4 are controlled: select next section voice or music, selection the preceding paragraph voice or music, stop to play, beginning broadcast etc.Whether LED light 7 is used to indicate the duty of player: have SD/MMC card, player to be in broadcast state or halted state etc. in the indication SD/MMC deck 4.
In the present embodiment, button 6 also can omit with LED light 7.
Embodiment 2:
The performance of the stereo WAVE player application of embedded type C D tonequality of the present invention when the market described in the present embodiment; The stereo WAVE player of embedded type C D tonequality of the present invention also includes communication interface 5; Said communication interface 5 is connected with MCU single-chip microcomputer 1; Be used to connect stereo WAVE player of said embedded type C D tonequality and external system, constitute the system of band voice broadcast function, realize control and function expansion.
The structure identical with embodiment 1 in the present embodiment repeats no more.Being illustrated in figure 3 as the gate control system structural drawing of the band phonetic function at gate, market, is player of the present invention in the frame of broken lines of the right, figure middle and upper part, is gate, the market control section of expansion in the top left frame of broken lines; The gate control system of this two parts primordial band phonetic function originally.Because the MCU single-chip microcomputer 1 of basic WAVE player of the present invention leaves rich pin and internal resource, so speech play is used with a slice MCU single-chip microcomputer 1 with big gate control.With microwave probe 8 in the door shown in Fig. 3, microwave probe 9, switch gate control circuit 10 directly are connected with the rich pin of MUC single-chip microcomputer 1 respectively outdoors, just can be easily WAVE player of the present invention be expanded into a door control system of being with voice play function.
As shown in Figure 3, wherein: microwave probe 8 is inner towards the gate, market in the door, is used to detect in the market that client walks out or near the gate, market; Microwave probe 9 is outside towards the gate, market outdoors, is used to detect that client gets into the market outside the market; Switch gate control circuit 10 is used to control opening the door automatically and closing of gate, market.
A market has several gates usually; Use the door control system control of a band voice play function on each gate; Then each communication interface 5 of being with the door control system of voice play function to pass through itself is connected with the market central control system; Just form gate, market turn-key system, as shown in Figure 3.
The present embodiment working method is:
When MCU single-chip microcomputer 1 through microwave probe 8 in the connected door, when microwave probe 9 detects and do not have client near the gate outdoors; 1 of MCU single-chip microcomputer cuts out door through connected control opening-closing door circuit, quiet and secluded music file that stores on the loop play SD/MMC card simultaneously or product advertising etc.
When MCU single-chip microcomputer 1 through connected microwave probe outdoors 9 detected client near or when getting into the market; 1 of MCU single-chip microcomputer stops playing back music; Read the corresponding digital audio file; Play the salutatory of " welcoming to get into the shopping of xxx shop ", and, open the gate for client automatically simultaneously through the opening-closing door control circuit.
Detected client near preparing to exit the market and work as MCU single-chip microcomputer 1 through microwave probe 8 in the connected door; 1 of MCU single-chip microcomputer stops playing back music; Read the corresponding digital audio file, play the speech of seeing off of " thanks shopping, welcome to come again " in the xxx shop; And, open the gate for client automatically simultaneously through the opening-closing door control circuit.
Door control system of each band voice play function is through communication interface, and the status data that will work as foregate is sent to central control room (CCR), and central control room (CCR) just can be understood situation and the customer flow at each gate etc. at any time.
If generation emergency condition; Central control unit is through communication interface 5, and the order at the whole gates of emergency opening is sent to the door control system of each band voice play function, and each then controls corresponding opening-closing door control circuit with the door control system of voice play function; The gate is opened; And read the corresponding digital audio file simultaneously, and play the voice of promptly warning of " asking everybody promptly to leave the market ", notify client to leave the market.
Warm more, a convenient and safe shopping environment built and provided to the use of present embodiment can for client.
Communication interface 5 also can be used for connecting with other outside system in the present embodiment, and other external system can be come the work of controls playing device through communication interface like this.For example; Can be connected the communication interface of a machine tool control system with communication interface of the present invention; When this outside machine tool control system machines a workpiece; Or discovering device is when having produced fault; It can send the MCU single-chip microcomputer 1 that corresponding instruction is given WAVE player of the present invention through this communication interface, and MCU single-chip microcomputer 1 reads preprepared corresponding WAVE audio data file according to the instruction that receives from the SD/MMC card, and it is play through the auditory tone cues operating personnel.In addition, MCU single-chip microcomputer 1 also leaves rich pin and internal resource, also can realize function expansion and secondary development easily.
In addition, in the present embodiment, all voice suggestions and quiet and secluded music all leave on the SD/MMC card.The user must not rely on the professional system is made any change; At any time can the SD/MMC card be taken out from system; Be inserted on the common computer; Through common document copying mode, change different background musics and the voice suggestion that meets own market characteristics, product advertising etc., demonstrated fully advantage of the present invention.
Claims (5)
1. the stereo WAVE player of embedded type C D tonequality is characterized in that, comprises MCU single-chip microcomputer (1), four-operational amplifier (2), audio output port (3) and SD/MMC deck (4); Said MCU single-chip microcomputer (1) cooperates resistance, electric capacity to be connected with four-operational amplifier (2); Said four-operational amplifier (2) cooperates resistance, electric capacity to be connected with audio output port (3); Said SD/MMC deck (4) is connected with MCU single-chip microcomputer (1) through the SPI data line; Said MCU single-chip microcomputer (1) reads the DAB source file on the SD/MMC card through SD/MMC deck (4); Digital audio-frequency data is transferred to four-operational amplifier (2); The circuit of forming through four-operational amplifier (2) and resistance, electric capacity is transformed into simulated audio signal and filter away high frequency noise, exports via audio output port (3);
Wherein, said MCU single-chip microcomputer (1) is integrated with the general MCU single-chip microcomputer of SPI interface and four 8 PWM output ports greater than 24MHz, inside for working clock frequency;
Wherein, four 8 PWM output ports of said MCU single-chip microcomputer (1) are connected through resistance, electric capacity with said four-operational amplifier (2) respectively, constitute hybrid 16 DAC of two-way weighting resistor/PWM, realize 16 DA conversions of left and right acoustic channels.
2. the stereo WAVE player of embedded type C D tonequality according to claim 1 is characterized in that, inner integrated four operational amplifiers independently of said four-operational amplifier (2) have four tunnel inputs and export with four the tunnel.
3. the stereo WAVE player of embedded type C D tonequality according to claim 1 is characterized in that said audio output port (3) is an earphone socket.
4. the stereo WAVE player of embedded type C D tonequality according to claim 1 is characterized in that, also comprises button (6), LED light (7); Said button (6) is connected with MCU single-chip microcomputer (1), is used for the choosing of the song of the SD/MMC card in the SD/MMC deck (4) is broadcast and broadcast is controlled; Said LED light (7) is connected with MCU single-chip microcomputer (1), in order to indicating operating status.
5. the stereo WAVE player of embedded type C D tonequality according to claim 1 is characterized in that, also comprises communication interface (5); Said communication interface (5) is connected with MCU single-chip microcomputer (1), is used to connect stereo WAVE player of said embedded type C D tonequality and external system, constitutes the system of band voice broadcast function, realizes control and function expansion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105882522A CN102005227B (en) | 2010-12-15 | 2010-12-15 | Embedded CD acoustic stereo WAVE player |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105882522A CN102005227B (en) | 2010-12-15 | 2010-12-15 | Embedded CD acoustic stereo WAVE player |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102005227A CN102005227A (en) | 2011-04-06 |
| CN102005227B true CN102005227B (en) | 2012-06-13 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010105882522A Expired - Fee Related CN102005227B (en) | 2010-12-15 | 2010-12-15 | Embedded CD acoustic stereo WAVE player |
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| Country | Link |
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| CN (1) | CN102005227B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104468713A (en) * | 2014-10-31 | 2015-03-25 | 深圳市杰矽科技有限公司 | Vehicle-mounted integrated information system based on 3G/WIFI wireless network |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101035422A (en) * | 2006-03-07 | 2007-09-12 | 张恩迪 | U disk MP3 portable sound system |
| CN201142231Y (en) * | 2007-12-07 | 2008-10-29 | 大庆市三石电子技术开发有限公司 | Multifunctional digital timing reminding player |
| CN101559899A (en) * | 2009-05-11 | 2009-10-21 | 苏州新达电扶梯部件有限公司 | Elevator MP3 phonetic device |
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2010
- 2010-12-15 CN CN2010105882522A patent/CN102005227B/en not_active Expired - Fee Related
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| CN102005227A (en) | 2011-04-06 |
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