CN2418520Y - Portable digital music-player - Google Patents
Portable digital music-player Download PDFInfo
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- CN2418520Y CN2418520Y CN 00217100 CN00217100U CN2418520Y CN 2418520 Y CN2418520 Y CN 2418520Y CN 00217100 CN00217100 CN 00217100 CN 00217100 U CN00217100 U CN 00217100U CN 2418520 Y CN2418520 Y CN 2418520Y
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Abstract
The utility model discloses a portable digital music-player, which comprises a micro-control unit, a digital-to-analog converting unit, an analog-to-digital converting unit, a liquid crystal display unit, a program memory unit, a content memory unit, a communication interface and an operation control unit, wherein the digital-to-analog converting unit and the analog-to-digital converting unit are connected with the micro-control unit through a mode of serial buses, and the liquid crystal display unit, the program memory unit, the content memory unit and the communication interface are connected with the micro-control unit through a mode of buses. Standard digital audio frequency of compressed formats such as MP3, WMA, etc. can be displayed by the product, and the utility model has the functions of small volume, convenient carrying and recoded sound replaying.
Description
The present invention relates to a device for recording a carrier, and more particularly, to a portable digital music player capable of playing compressed format standards such as MP3 and WMA.
MPEG1 Audio Layer3 abbreviated as MP3, MP3 is a brand new digital Audio signal compression format standard, its compression ratio is high, and its tone quality can be close to that of laser music disk (CD Audio), so that the laser disk using MP3 as compression format is also gradually popularized, and will gradually replace the traditional laser disk (CD). Windows Media Audio is abbreviated as WMA, which is another digital Audio signal compression standard proposed by Microsoft corporation. The conventional playing device with MP3 compressed format is basically to use a multimedia microcomputer (PC) to decompress and play, or to use a high-version VCD, SVCD, DVD desktop machine compatible with MP3 compressed format to decompress and play, and to use the multimedia PC to decompress and play, as long as corresponding decompression software is installed on the multimedia PC, the MP3 optical disc is placed in the optical drive and processed by the decompression software, and then the audio signal with MP3 compressed format can be played through the sound dominator card in the computer, but playing by using the multimedia PC has the following defects that the multimedia PC has higher cost, and the playing by using the multimedia PC MP3 requires to install corresponding decompression software, which is troublesome in operation, and therefore, only the personnel who can operate the computer can use the device. The desktop machine adopting high version compatible MP3 format VCD, SVCD, DVD plays, although the cost is lower and the operation is easier, it is bigger with the multimedia PC and can not be carried about. Some portable products such as a portable audio player and a pocket laser player are sold in the market, the conventional cassette tape or laser disc is used for the portable products, the internal drive of the player adopts a mechanical structure, so that the power consumption is high, the shock is not prevented, and the vulnerability is high due to the adoption of a mechanical transmission structure. In addition, such products basically have only a play function and no recording/playback function, so that some uses are limited, and portable products with a recording function are basically pocket recorders, but because of the use of a conventional magnetic tape, the sound quality is not ideal when analog signals are used for recording and playing.
An object of the utility model is to provide a portable digital music player, this product not only can play the audio signal of compression format standard such as MP3 and WMA, still has the record playback function simultaneously, and still has small, the portable characteristics of being convenient for.
In order to realize the task, the utility model discloses a solution is: a portable digital music player is provided, which consists of a micro control unit, an analog-to-digital conversion unit, a digital-to-analog conversion unit, a power supply unit, a liquid crystal display unit, a communication interface, a program memory unit, a built-in content memory unit, an extended content memory interface, an operation control unit, a microphone, an earphone and other parts; wherein,
the micro control unit is a core component and consists of a single-chip microprocessor, wherein the single-chip microprocessor comprises a bus of an address, data and a control signal and a general input/output port; the main task is to process audio signals such as MP3 and WMA and to control the coordination of the units by means of programs that are fixed in the program memory unit.
The analog-to-digital conversion unit is composed of an analog-to-digital converter (A/D) sampling chip, and the output end of the analog-to-digital conversion unit passes through a digital audio interface (I)2S) the serial bus mode is connected with a single chip processor in the micro control unit, and the input end of the serial bus mode is connected with a microphone; during recording, the sampled analog signals are converted into serial digital signals through the microphone, the data are transmitted to the micro control unit in a serial mode, and the data are processed by the micro control unit and then stored in the contentAmong the memory units;
the digital-to-analog conversion unit is composed of a digital-to-analog converter (D/A) conversion chip, and its input end is connected with a digital audio interface (I)2S) the serial bus mode is connected to a single-chip microprocessor in the microcontroller unit, the output end of the single-chip microprocessor is connected to the earphone after passing through an audio signal amplification chip, and the important function of the single-chip microprocessor is to convert serial digital signals in compressed formats such as MP3, WMA and the like into analog signals and then output the analog signals to the earphone for playing;
the liquid crystal display unit is composed of a liquid crystal display screen, is connected with the bus of the single-chip microprocessor in the micro control unit through an address bus, a data bus and a control bus, and is used for displaying the playing state to play a role in prompting;
the communication interface is connected with the bus of the single chip microprocessor in the micro control unit through an address bus, a data bus and a control bus and is used as a socket for data transmission with the PC;
the program Memory unit is composed of Flash Memory, which is connected with the single-chip microprocessor bus in the micro control unit through address, data and control bus, and stores the program of the player;
the built-in content Memory unit consists of a Flash Memory, is connected with a bus of a single chip microprocessor in the micro control unit through an address bus, a data bus and a control bus and is used for storing digital audio signal files;
the interface of the extended content memory is composed of a multimedia card socket and is connected with the micro control unit to be used as a socket of the extended content memory.
The operation control unit is composed of a button switch, is connected with a universal input/output port of a single-chip microprocessor in the micro control unit through a control signal line and is used for setting and operating the portable digital music player.
According to the structural characteristics of the present invention, compared with the conventional MP3 player, the present invention has the following advantages:
(1) the utility model discloses can play the audio signal of compression format standard such as MP3 and WMA, and still have the recording playback function simultaneously.
(2) The utility model discloses a scintillation type memory is as content memory, and links to each other with the PC through communication interface, among the audio signal file transmission content memory that the user will select, therefore very convenient in the use, the mechanical drive part of having omitted traditional CD again, makes this product have shockproof function, and the consumption is also lower, has prolonged the live time of battery, especially is fit for the characteristic that portable product required low-power consumption.
(3) The utility model has the advantages of small volume and convenient carrying.
The following structural drawings describe the embodiments of the present invention in detail.
Fig. 1 is a schematic block circuit diagram of the present invention.
Fig. 2 is a circuit connection diagram of the digital-to-analog conversion unit and the analog-to-digital conversion unit of the present invention.
Fig. 3 is a circuit connection diagram of the main control unit, the extended content memory interface, and the operation control unit according to the present invention.
Fig. 4 is a circuit connection diagram of the liquid crystal display unit of the present invention.
Fig. 5 is a circuit connection diagram of the power supply unit of the present invention.
Fig. 6 is a circuit connection diagram of the program memory unit and the built-in content memory unit according to the present invention.
Fig. 7 is a circuit connection diagram of the communication interface unit (using the USB interface) of the present invention.
The utility model relates to a portable digital music player, which is mainly composed of a player host, an earphone, a communication interface of the player host and a connecting cable for transmitting data between a PC machine. The player host comprises a player shell, a plurality of operation control buttons, an earphone socket, a cable connecting socket and a printed circuit board provided with integrated circuits, resistors, capacitors and other components.
Referring to fig. 1, fig. 1 is a schematic circuit diagram of the present invention, which mainly comprises a micro control unit 1, an analog-to-digital conversion unit 2, a digital-to-analog conversion unit 3, a power supply unit 10, a liquid crystal display unit 7, a communication interface 8, a program memory unit 4, a built-in content memory unit 5, an extended content memory interface 6, an operation control unit 9, a microphone 13, and an earphone 12.
Referring to fig. 3, the mcu 1 is a core component, and the mcu 1 is composed of a single-chip microprocessor (CPU) U9. The method mainly decodes MP3, WMA and the like and controls peripheral chips in peripheral units, and a single-chip microprocessor U9 of the Cirrus Logic company with the model number of EP7209 is selected in the embodiment. The single-chip microprocessor U9 is a bus including address, data, and control signals of a 32-bit CPU, and has a built-in static memory (RAM) of 38.4 KB, into which the working program of the player is loaded from the program memory unit 4 and run, and a Read Only Memory (ROM) of 128 bytes. The single-chip microprocessor U9 uses two sets of 2.5V and 3.3V working power supplies, in the embodiment of the present invention, a clock frequency of 75 mega (MHz) is selected, and the single-chip microprocessor U9 further has 3 general purpose input/output ports (GP I/O for short).
Monolithic microprocessor U9(EP7209) main pin definitions:
PA.0-PA.5 push button switch scanning
PA．6--PA．7 I2S bus control
PD.1-PD.4 liquid crystal display control
PD.5-PD.7 extended content storage interface connection
(clock, data, address)
D0-D1516 bit data bus
A1- -A2323 bit address bus
A0, A24 (address) chip select signals
Chip selection signals of chips at the periphery of CS 0-CS 2 and CS4
MOE flash memory read signal
MWE flash memory write signal
Referring to fig. 2, the analog-to-digital conversion unit 3 is composed of an analog-to-digital converter (a/D) sampling chip U6, in this embodiment, an MSM7702 sampling chip U6 from OKI corporation is selected; the sampling frequency of the sampling chip U6 is 8KHz, and 3.3V power supply voltage is adopted; the output end of the audio amplifier is connected with a digital audio interface (I)2S) serial bus mode is connected to the single-chip microprocessor U9 in the micro control unit 1, the input end of which is connected to the plug-in J1 of the microphone 13, and during recording, the analog signal of the voice or other audio from the microphone 13 is mainly converted into serial digital signal, and the data is transmitted to the micro control unit 1 in serial mode, and then the data is processed by the micro control unit 1 and stored in the content memory unit.
The main pin definitions of the analog-to-digital converter sampling chip U6(MSM 7702):
PCMOUT (Serial) encoded output
BCLK clock pulses
AIN-, AIN + analog signal input
Referring to FIG. 2, the digital-to-analog conversion unit 2 is formed by a digital-to-analog converter (D/A) conversion coreThe chip U54, in this embodiment, CS4341 conversion chip U54 from Cirrus Logic is selected; the conversion frequency of the conversion chip U54 is 44.1 KHz, and 3.3V power supply voltage is adopted; the input end of the digital audio interface (I)2S) serial bus connected to the one-chip microprocessor U9 in the microcontroller unit 1, whose output passes through the audio amplifier chip U53 and then to the jack J15 of the headset 12. The audio amplification chip U53 is a dual-channel audio amplification integrated circuit TDA7050 from PHILIPS. The digital-to-analog conversion unit 2 is used for converting serial digital signals of the MP3 and WMA in the compressed format standard sent from the micro control unit 1 into analog signals, and then outputting the analog signals to the earphone 12 for playing.
The main pin definition of the digital-to-analog converter conversion chip U54(CS 4341):
SDATA data input (Serial digital signal)
SCLK clock pulse
Analog output of AOUTA and AOUTB left and right sound channels
Referring to fig. 4, the lcd unit 7 is composed of a liquid crystal display U1, which is a liquid crystal display U1 of EPSON corporation type TCM-a 1153; the liquid crystal display screen U1 is connected with data buses D0-D7, general input/output ports PD.1-PD.4 and control signal lines nSC2 of a single chip microprocessor U9 in the micro control unit 1 through address, data and control signal lines. The display unit 7 is used for displaying contents such as playing states, song names, lyrics and the like, and can also display 4 lines of Chinese character information, and the display dot matrix is 112 bytes by 64 bytes.
Referring to fig. 7, in the present embodiment, the communication interface 8 employs a Universal Serial Bus (USB) interface J20, which is now more and more commonly used in computer interfaces, and becomes a universal interface standard, and has the characteristics of high transmission rate up to 1 MB/S, simple interface, and convenient use. In the implementation, a PDIUSBD12 universal serial bus interface chip U55 of PHILIPS is selected, the universal serial bus interface chip U55 is connected with a bus of a single-chip microprocessor U9 in the micro control unit 1 through an address bus, a data bus and a control bus, and is mainly used as an interface for data transmission with a PC and is connected with the PC for downloading and uploading audio signal files and other data files.
The main pin definitions of the universal serial bus interface chip U55(PDIUSBD 12):
D0-D78 bit data bus
A0 chip select signal
/RD _ U USB Enable Signal (read)
/WR _ U USB Enable Signal (write)
/RSET _ N reset signal
INT _ N initialization signal
XTAL1, XTAL 26 MHZ clock pulse signal input
D-, D + USB interface communication channel
In addition, the communication interface 8 for transferring data to and from the computer may also adopt an asynchronous serial interface mode, which is also commonly called an RS-232C mode, in addition to the Universal Serial Bus (USB) interface described in this embodiment, and this mode has the characteristic of simple interface connection, but the transmission rate of this serial mode is not very high, and at present, the highest rate can only reach 38400 baud/sec. The parallel interface mode, namely the computer parallel printing port which is commonly called, can be adopted for transmission, and the mode has the characteristic of high transmission speed, but the cable connection interface of the parallel mode is relatively complicated.
Referring to fig. 6, the internal content storage unit 5 is composed of flash memories, in this embodiment, two flash memories U29 and U31 of INTEL corporation model E28F16M3a250 are selected, and the storage capacity of the flash memory E28F16M3a250 is 16 Megabytes (MB). In addition, the two flash memories U29 and U31 are connected with the bus of the single chip microprocessor U9 in the micro control unit 1 through an address bus, a data bus and a control bus, and are mainly used for storing digital audio signal files of playing contents.
Referring to fig. 3, the extended content memory interface 6 is composed of a multimedia card socket JP _ MMC, which is connected to general purpose input/output pd.5, pd.6, pd.7 of a single-chip microprocessor U9 in the mcu 1 to serve as a socket for an extended flash memory (Flashmemory). The flash memory of choice may be a multimedia card (MMC) from siemens.
Referring to fig. 3, the operation control unit 9 is composed of push-button switches S1, S2, S3, S4, S5 and S6, and is respectively connected to general input/output ports pa.0, pa.1, pa.2, pa.3, pa.4 and pa.5 of the single-chip microprocessor U9 in the micro control unit 1, and is used for setting and operating the portable digital music player.
Referring to fig. 6, the program memory unit 4 is an SM-DC800BFA flash memory chip U14 from SGEML, the capacity of the chip U14 is 2 Megabytes (MB) for storing programs for work and operation, and the chip U14 is connected to the bus of the single-chip microprocessor U9 in the micro control unit 1 through an address bus, a data bus, and a control bus.
Referring to fig. 5, the power supply unit 10 is composed of a MAX1675 chip U27 and a MAX8868_ EUK chip U10 of MAXIM corporation, and the MAX1675 chip U27 mainly boosts the 1.5V power to 3.3V to provide the voltage for the single chip microprocessor U9 and the peripheral chips in other units to work; the MAX8868_ EUK chip U10 regulates and steps down the 3.3V supply to 2.5V to provide another set of operating voltages for the monolithic microprocessor U9.
Claims (4)
1. A portable digital music player, comprising: the device comprises a microphone, an earphone and a power supply unit; the method is characterized in that: the system comprises a micro control unit, an analog-to-digital conversion unit, a digital-to-analog conversion unit, a liquid crystal display unit, a communication interface, a program memory unit, a built-in content memory unit, an extended content memory interface and an operation control unit; wherein,
the micro control unit consists of a single chip microprocessor, wherein the single chip microprocessor comprises a bus of an address, data and a control signal and a general input/output port;
modulus of elasticityThe conversion unit is composed of A/D sampling chips, and its output end passes through I2The S serial bus mode is connected with the single chip microprocessor in the micro control unit, and the input end of the S serial bus mode is connected with the microphone;
the D/D conversion unit is composed of D/D conversion chips, and its input end is passed through I2The S serial bus mode is connected with a single-chip microprocessor in the microcontroller unit, and the output end of the S serial bus mode is connected to the earphone after passing through the audio signal amplification chip;
the liquid crystal display unit consists of a liquid crystal display screen and is connected with the bus of the single-chip microprocessor in the micro control unit through an address bus, a data bus and a control bus;
the communication interface is connected with the bus of the single-chip microprocessor in the micro control unit through an address bus, a data bus and a control bus;
the program memory unit consists of a flash memory and is connected with a bus of a single-chip microprocessor in the micro-control unit through an address bus, a data bus and a control bus;
the built-in content memory unit consists of a flash memory and is connected with a bus of a single chip microprocessor in the micro control unit through an address bus, a data bus and a control bus;
the extended content memory is composed of a multimedia card seat and is connected with a general input/output port of a single chip microprocessor in the micro control unit;
the operation control unit is composed of a button switch and is connected with a general input/output port of a single chip microprocessor in the micro control unit.
2. A portable digital music player as recited in claim 1, wherein: the communication interface is a universal serial bus interface.
3. A portable digital music player as recited in claim 1, wherein: the communication interface is a parallel interface.
4. A portable digital music player as recited in claim 1, wherein: the communication interface is an asynchronous serial interface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00217100 CN2418520Y (en) | 2000-03-31 | 2000-03-31 | Portable digital music-player |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00217100 CN2418520Y (en) | 2000-03-31 | 2000-03-31 | Portable digital music-player |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2418520Y true CN2418520Y (en) | 2001-02-07 |
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ID=33582719
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 00217100 Expired - Fee Related CN2418520Y (en) | 2000-03-31 | 2000-03-31 | Portable digital music-player |
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| Country | Link |
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| CN (1) | CN2418520Y (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1302391C (en) * | 2001-07-18 | 2007-02-28 | 索尼株式会社 | Recording apparatus and method |
| CN1308808C (en) * | 2003-12-19 | 2007-04-04 | 联想(北京)有限公司 | Portable computer with display sharing function |
| CN100354854C (en) * | 2002-06-28 | 2007-12-12 | 上海奔流电子有限公司 | Universal musical player module |
| CN100362499C (en) * | 2004-07-09 | 2008-01-16 | 索尼株式会社 | Electronic apparatus |
| WO2013063994A1 (en) * | 2011-11-04 | 2013-05-10 | 忆正科技（武汉）有限公司 | Embedded storage and embedded storage system |
| CN103248976A (en) * | 2013-02-07 | 2013-08-14 | 安百特半导体有限公司 | Method and equipment for supplying power to noise reduction earphone by utilizing power supply of electronic equipment |
-
2000
- 2000-03-31 CN CN 00217100 patent/CN2418520Y/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1302391C (en) * | 2001-07-18 | 2007-02-28 | 索尼株式会社 | Recording apparatus and method |
| CN100354854C (en) * | 2002-06-28 | 2007-12-12 | 上海奔流电子有限公司 | Universal musical player module |
| CN1308808C (en) * | 2003-12-19 | 2007-04-04 | 联想(北京)有限公司 | Portable computer with display sharing function |
| CN100362499C (en) * | 2004-07-09 | 2008-01-16 | 索尼株式会社 | Electronic apparatus |
| WO2013063994A1 (en) * | 2011-11-04 | 2013-05-10 | 忆正科技（武汉）有限公司 | Embedded storage and embedded storage system |
| CN103248976A (en) * | 2013-02-07 | 2013-08-14 | 安百特半导体有限公司 | Method and equipment for supplying power to noise reduction earphone by utilizing power supply of electronic equipment |
| WO2014121576A1 (en) * | 2013-02-07 | 2014-08-14 | 安百特半导体有限公司 | Method and device for supplying power for noise-reducing earphones using power supply of electronic device |
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| CF01 | Termination of patent right due to non-payment of annual fee |