CN2577401Y

CN2577401Y - CD playing unit

Info

Publication number: CN2577401Y
Application number: CN 02285694
Authority: CN
Inventors: 孙斌
Original assignee: Individual
Current assignee: Individual
Priority date: 2002-11-11
Filing date: 2002-11-11
Publication date: 2003-10-01
Anticipated expiration: 2012-11-11

Abstract

The utility model discloses a CD playing unit, which comprises an interface unit of a USB movable memory device composed of a down USB port, a USB main controller and USB system program firmware. The USB main controller and the USB system program firmware complete read-write operation to files and data in USB mobile memories of various standards so as to realize playing multimedia data stored in a USB mobile memory, thereby, enlarging the program source of the CD playing unit, and providing a simple method for copying data in a CD to a USB mobile memory.

Description

CD player

The utility model relates to a kind of CD player.

Present widely used CD player is to import as the audio or video data with optical disk medium, and its general disk format has CD, VCD, DVD and MP3 CD etc.Though CD media has high capacity, low cost, convenience, advantage such as durable, but an one shortcoming is imprinting in advance.This has limited the program source of player to a certain extent.On the other hand, in computer memory technical, be extensive use of at present with USB (universal serial bus) (Universal Serial Bus, abbreviate USB as) be that the mobile storage means of connected mode, its storage medium mainly comprise two kinds of mobile hard disc and flash memories (Flash Memory).The USB flash memory device has serial advantages such as standardization, plug and play, high capacity, two-forty, and can be repeatedly erasable, is convenient to very much from computing machine or downloads on the net and swap data, and can be used as abundant programme source.But present CD player can not read and play the multi-medium data in the USB flash memory device.

In addition, carry-on portable CD of a part or the DVD player of releasing is provided with USB interface in the recent period, is used to realize use with the computing machine connection and as external CD-ROM or DVD-ROM driver.Because the USB interface on these players all is up (upstream) USB port, is connected on descending (downstream) USB port of main frame, and does not possess USB master controller (USB Host Controller for this purpose; The USB system can only use a master controller simultaneously), thereby this class portable light disc player can not read and play the audio-visual data in the USB flash memory device.

The purpose of this utility model is to provide a kind of CD player, it can read in the USB flash memory device the audio or video data and with its decoding with play back, and can be used as the simple device of a kind of copy data in the USB flash memory device.

For achieving the above object, CD player of the present utility model comprises disk drive unit, digital signal processing unit, data processing unit, analogue audio frequency or vision signal generate output unit and system control unit, it is characterized in that it also comprises a USB flash memory device interface unit, the latter is by descending USB port, USB master controller and USB system program firmware are formed, described USB master controller and USB system program firmware thereof are finished the operation that the data that are connected in the USB flash memory device on the USB port are read and write, and the data that read from the USB flash memory device are sent to the data input pin of above-mentioned data processing unit.

Above-mentioned USB master controller also under the control and cooperation of its system program firmware, is imported from the data of above-mentioned digital signal processing unit output, and these data are written in the USB flash memory device that is connected on the described USB port.

With existing CD player relatively, the utility model has increased a kind of convenient, audio-visual data input mode efficiently, promptly the USB interface by standardization, plug and play and two-forty realizes the exchanges data between CD player and the computing machine, thereby has greatly expanded the program source of CD player.In addition, the utility model can also copy to the data on the CD in the coupled USB mobile memory, provide need not or can't computed situation under a kind of short-cut method of copy data.

This instructions will be further described technique scheme in conjunction with the accompanying drawings and embodiments with the lower part.

Accompanying drawing 1 is the composition diagram of the utility model embodiment.

Accompanying drawing 2 is logic diagrams of the USB master controller of the utility model embodiment use.

CD player shown in Figure 1 is the composition diagram of a DVD video disc player, and its disk format is DVD-Video (a MPEG-2 coding), and the CD of forms (MPEG-1 coding) such as compatible CD-Audio, VCD.This CD player comprises following standard component: disk drive unit 101, digital signal processing (DSP) unit 102, multimedia coding data processing unit 104, analogue audio frequency or vision signal generate output unit 105, system control unit 103, and other accessory (power supply, display panel, button, remote control unit etc.).Wherein, digital signal processing unit 102 picks up disk drive unit 101 and the photosignal that amplifies carries out processing such as amplitude limit denoising, EFM (or EFM-Plus) demodulation, bit clock generation, make its audio frequency that is reduced to the standard code form, video data (for example CD PCM, MPEG-1, MPEG-2 or MP3 etc.), thereby form data-signal DATA.This data-signal and corresponding clock signals thereof are delivered data processing unit 104 immediately and are handled, generally include storage format fractional analysis, sound channel or sound and look data separating, MPEG-1/2 decoding (Decoding) etc., generate complete DAB and the vision signal of not having compression thus.This signal forms the audio or video signal output of simulation at last by the processing of corresponding analog to digital converter (DAC) 105.Above-mentioned playing process is controlled by a system control unit 103, and this unit comprises special-purpose CPU and solidified in advance in being used to wherein realizes that the ROM program of normal play process control (is commonly referred to firmware, Firmware).In addition, this control module is also finished tasks such as counter plate demonstration, keypress function, remote controller signal acceptance.

Except that above-mentioned standardized component, present embodiment also comprises a USB flash memory device interface unit (106,107), and it is made of 107, USB master controller (USB Host Controller) 106 of a descending USB port (Downstream USB Port) and USB system program firmware thereof.Described USB system program firmware (comprises bus initialization except the every basic software function that realizes USB master controller 106, USB moves the insertion of peripheral hardware and shifts out detection, peripheral configuration and Data Transmission Controlling etc.), also comprise the file in the USB flash memory device 108 that is connected the standard on the USB port 107 is traveled through, select and the file data access function of read-write, and cooperate this USB master controller 106 the multimedia coding data that from USB flash memory device 108, read (MPEG-1/2 for example, MP3 etc.) be sent to the DATA input end of above-mentioned data processing unit 104.After being aided with corresponding clock signals, the multimedia coding data that data processing unit 104 can be sent here this are carried out conventional decode operation, realize the broadcast to the audio-video file data in the USB flash memory device 108 thus.

In addition, USB master controller 106 and USB system program firmware thereof also have USB flash memory device 108 are carried out the standard operation that data write.In the present embodiment, the data that write to flash memory device 108 of USB master controller 106 are DATA data (i.e. the audio or video data of the standard coding format of reading from CD) of 102 outputs from above-mentioned digital signal processing DSP unit.This provides a kind of data on the CD has been copied to short-cut method in the USB mobile memory 108, can need not or can't use under the computed situation.

For further specifying the data flow that said process is finished, Fig. 2 has provided the internal logic of the employed USB master controller 107 of present embodiment and has realized.Wherein main functional units has: USB transceiver (Transceiver) 201, serial interface engine SIE (Seral Interface Engine) 202, micro-processor kernel (μ P Core) 204 and firmware program 205, I/O port register group 206, ram in slice 203 and timer, data bus, clocked logic parts etc.The flow process that present embodiment is play USB mobile storage data is as follows: when USB master controller 106 reads data file selected in the USB mobile memory 108, the up digital communication signal of USB cable data line (Data ±) detects through transceiver 201, finish the conversion of digital signal and usb data bag (Packet) by SIE202, the usb data bag that is generated is stored the buffer zone in RAM203.Microprocessor 204 is by outputing to I/O port 206 to the data in the above-mentioned buffer zone to the routine call in its firmware 205, and this I/O port is finished the serialization (Serialization) of data, and forms the DATA data-signal of serial at its output pin.This signal is immediately by data processing unit 104 decodings and broadcast.

Carrying out data of optical disk in the process that USB mobile memory 108 writes, the flow direction of data is just in time opposite with above-mentioned playing process, that is: the conversion through I/O port 206 from the DATA data-signal of CD of digital signal processing DSP unit 102 output is cached among the RAM203, by the routine in microprocessor 204 and the firmware 205 thereof data are write out subsequently, successively via SIE202, transceiver 201 and mail to USB port 107.USB control chip in the USB mobile memory 108 detects and changes the digital signal of output on the USB port 107, and its data are written to specified file on the mobile memory.

The technical scheme of this instructions can also realize with other mode that is different from the foregoing description.Appending claims has been contained many distortion and the replacement to each key element described above.

Claims

1. CD player, comprise disk drive unit (101), digital signal processing unit (102), data processing unit (104), analog/digital signal conversion unit (105), system control unit (103), it is characterized in that: it also comprises a USB flash memory device interface unit (106,107), the latter is by descending USB port (107), USB master controller (106) and USB system program firmware thereof constitute, described USB master controller (106) and USB system program firmware thereof are finished the operation that the data that are connected in the USB flash memory device (108) on the USB port (107) are read and write, and the data that read from USB flash memory device (108) are sent to the data input pin of above-mentioned data processing unit (104).

2. CD player according to claim 1, it is characterized in that: described USB master controller (106) is also under the control and cooperation of its USB system program firmware, input is from the data of above-mentioned digital signal processing unit (102) output, and these data are written in the USB flash memory device (108) that is connected on the described USB port (107).