CN102263938B - Image pickup system and method using dual-isochronous USB (universal serial buses) - Google Patents
Image pickup system and method using dual-isochronous USB (universal serial buses) Download PDFInfo
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- CN102263938B CN102263938B CN 201010192511 CN201010192511A CN102263938B CN 102263938 B CN102263938 B CN 102263938B CN 201010192511 CN201010192511 CN 201010192511 CN 201010192511 A CN201010192511 A CN 201010192511A CN 102263938 B CN102263938 B CN 102263938B
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Abstract
The invention provides an image pickup system and method using dual-isochronous USB (universal serial bus). The image pickup system comprises a USB image pickup device for transmitting the captured image data streams from USB interfaces via two terminal points. A host device receives the image data streams through the USBs; and a driving unit reads the image data streams and generates reading extension data structures for a first terminal point and a second terminal point so as to process packets of the first terminal point and the second terminal point, then, dispatches the received packets, and simultaneously, copies packet data of the first terminal point and the second terminal point to a first buffer zone and a second buffer zone respectively, and when ending picture frame flags in the packets of the first terminal point and the second terminal point are both set, the driving unit combines the data in the first buffer zone and the second buffer zone into a picture frame so as to transmit the combined picture frame to the host device.
Description
Technical field
(Universal Serial Bus, technical field USB) relate in particular to a kind of camera system and method for type USB when adopting two the grade to the present invention relates to USB.
Background technology
Along with the change of image capture technology, the progress of image processing technique, image capture unit develops into digital camera (digital camera) by traditional camera, and digital camera also becomes the image capture unit that generally uses at present.Store via the mode of digital camera institute picked image, for example be stored in in-building type internal memory (memory medium) or the extractable and changeable memory card (memory card) with digital image file (digital image file).Because the resolution of digital camera is far beyond the resolution height of the picture window on it, therefore normal use USB (USB) is sent to computer with digital image file, and the image processing software in the system that uses a computer carries out image processing.
The transmission of USB can be divided into: 1, control type transmission (control transfer); 2, interrupt-type transmission (interrupt transfer); 3, flood tide type transmission (bulk transfer); 4, etc. type transmission (isochronous transfer) time, wherein, the mistake of data is not considered in the type transmission when waiting, so digital camera all adopts type transmission when waiting, in order to the quickening transmission speed will pass image to computer the time.
During existing digital camera employing etc. during the type transmission, type transmission (isochronous transfer) when it uses single the grade.At this moment, driver on the computer can be opened the transmission channel of an imaging data stream, it calls out USBCAMD_SelectConfiguration () function, to obtain required USB (USB) frequency range and relevant coder/decoder, driver is also called out SBCAMD_PrepareChannel () function, prepare an image transmission channel as the imaging data stream of digital camera, then, call out USBCAMD_ReadChannel () function again, in order to read image frame from the image transmission channel.
Fig. 1 is existing USB schematic diagram during type transmission when first-class, and it uses a usb protocol analyzer (USB protocol analyzer) to measure USB and obtains.As shown in Figure 1, the transmission of package 122238 (transfer) comprises transmission (transaction) 20876, transmission 20877 and transmits 20878.The transmission of package 122245 (transfer) comprises transmission (transaction) 20879 and transmits 20880.The transmission of package 122250 (transfer) comprises transmission (transaction) 20881, transmission 20882 and transmits 20883.No matter which package, its first terminal point by digital still camera is sent.This is owing in the prior art, all only have a terminal point in the digital camera, and also only support a terminal point in the USB video classification (USB Video Class).
Fig. 2 is the schematic diagram of existing driver handles data.Driver will transmit (transaction) 20876 in regular turn, transmit 20877 and transmit package 1 that 20878 data form, transmit (transaction) 20879 and transmit package 2 that 20880 data form, transmit (transaction) 20881, transmit 20882 and transmit the package 3 that 20883 data are formed.Thereafter step is identical, repeats no more.After receiving a whole drawing frame data, driver in regular turn with package 1, package 2, package 3 ... data be copied in the RawFrameBuffer buffer.
Owing to all only have in a terminal point and the USB video classification (USB Video Class) in the existing digital camera and also only support a terminal point, so when driver is called out the USBCAMD_SelectConfiguration function, only can obtain the frequency range of 24MB/sec.Yet because the resolution of digital camera increases day by day, single terminal point and corresponding frequency range can't be sent to host side with the image on the digital camera fast, so in the prior art, the USB digital camera with single terminal point still has and improves the space.
Summary of the invention
Main purpose of the present invention is to provide the camera system and the method for type USB (USB) when a kind of employing is two to be waited, thereby can increase transmission speed, apace image is sent to a host side by camera system.
According to one aspect of the present invention, the present invention proposes a kind of image capture method of type USB (USB) when adopting two the grade, it transmits data between a USB camera and a host apparatus, this USB camera has one first terminal point (end point) and one second terminal point, with with its picked image data flow, transmit from this usb bus by these two terminal points, this host apparatus has a usb bus and a driver element (driver), by this usb bus to receive the imaging data stream that this USB camera is transmitted, and transferring data to this USB camera, this method comprises: A) this driver element reads the imaging data stream of this USB camera; B) this driver element produces one to this first terminal point and this second terminal point and reads the extension data structure, with this first terminal point of handling this USB camera and the package of this second terminal point; C) this driver element is sent the package of receiving via this usb bus; D) this driver element is handled the package of this first terminal point and this second terminal point respectively, and with the data in the package of the package of first terminal point and second terminal point, is copied to one first buffering area and one second buffering area; E) this driver element judges whether the package of this first terminal point has an end picture frame flag to be set and whether the package of this second terminal point has an end picture frame flag to be set; F) judging this end picture frame flag in the package of two terminal points that this end picture frame flag in the package of this first terminal point is set and is somebody's turn to do when this driver element is set, this driver element synthesizes a picture frame with the data set in this first buffering area and this second buffering area, and sends this host apparatus to.
According to another aspect of the present invention, the present invention proposes a kind of camera system of type USB (USB) when adopting two the grade, mainly comprises a USB camera, an and host apparatus.This USB camera has first terminal point and second terminal point (end point), with its picked image data flow, transmits from this usb bus by these two terminal points.This host apparatus has a usb bus and a driver element (driver), receiving the imaging data stream that this USB camera is transmitted, and transfers data to this USB camera by this usb bus; Wherein, read the imaging data stream of this USB camera as this driver element, and this first terminal point and this second terminal point are produced one read the extension data structure, with this first terminal point of handling this USB camera and the package of this second terminal point, send the package of receiving via this usb bus again, handle the package of this first terminal point and this second terminal point simultaneously respectively, and with the data in the package of the package of this first terminal point and this second terminal point, be copied to one first buffering area and one second buffering area, judge again whether have in the package of this first terminal point one finish that the picture frame flag is set and the package of this second terminal point in whether have one to finish the picture frame flag and be set, when this driver element judge that this end picture frame flag in the package of this first terminal point is set and the package of this second terminal point in this end picture frame flag be set, this driver element synthesizes a picture frame with the data set in this first buffering area and this second buffering area, and sends this host apparatus to.
Description of drawings
Fig. 1 is existing USB schematic diagram during type transmission when first-class.
Fig. 2 is the schematic diagram of existing driver handles data.
The system schematic of Fig. 3 camera system of type USB when to be that the employing of one embodiment of the present invention is two wait.
The flow chart of Fig. 4 image capture method of type USB when to be that the employing of one embodiment of the present invention is two wait.
Fig. 5 is the schematic diagram of USBCAMD_ReadExtension data structure of the present invention.
Fig. 6 is the schematic diagram of the present invention _ USBCAMD_DUALISO_EXTENSION data structure.
Fig. 7 is the schematic diagram of USBCAMD_ReadChannel data structure of the present invention.
Fig. 8 is step D of the present invention) detail flowchart.
Fig. 9 is USB of the present invention schematic diagram during type transmission when first-class.
Figure 10 is the schematic diagram of driver element deal with data of the present invention.
[primary clustering symbol description]
310 USB cameras, 320 host apparatus
321 driver elements, 322 USBs
323 first buffering areas, 325 second buffering areas
327 finish picture frame flag 329 finishes the picture frame flag
311 first terminal points, 313 second terminal points
(A)～(F) step (D1)～(D37) step
Embodiment
The invention relates to a kind of camera system and method for type USB when adopting two the grade, the system schematic of the camera system of type USB when Fig. 3 be the two grade of the employing of one embodiment of the present invention.As shown in Figure 3, the present invention includes a USB camera 310 and a host apparatus 320.This USB camera 310 passes through a USB 322, and is connected with this host apparatus 320.
This USB camera 310 has first terminal point 311 and second terminal point 313, with its picked image data flow, transmits from this usb bus 322 by these two terminal points 311,313.
It has this usb bus 322 and a driver element (driver) 321 this host apparatus 320, in order to receiving the imaging data stream that this USB camera 3t0 is transmitted, and transfers data to this USB camera 310 by this usb bus 322.
Wherein, read the imaging data stream of this USB camera 310 as this driver element 321, and this first terminal point 311 and this second terminal point 313 produced read the extension data structure respectively, in order to this first terminal point 311 of handling this USB camera 310 and the package of this second terminal point 313.Send the package of receiving via this usb bus 322 again, handle the package of this first terminal point 311 and this second terminal point 313 simultaneously respectively, and with the data in the package of the package of this first terminal point 311 and this second terminal point 313, be copied to one first buffering area 323 and one second buffering area 325, wherein, whether judge respectively has one to finish picture frame flag 327 and be set in the package of this first terminal point, and whether there is an end picture frame flag 329 to be set in the package of this second terminal point, when this driver element 321 judge that this end picture frame flag 327 in the package of these first terminal points 311 is set and the package of this second terminal point 313 in this end picture frame flag 329 be set, this driver element 321 synthesizes a picture frame with the data set in this first buffering area 323 and this second buffering area 325, and then sends this host apparatus 320 to.
The flow chart of Fig. 4 image capture method of type USB when to be that the employing of one embodiment of the present invention is two wait, it transmits data at a USB camera 310 and 320 of host apparatus, in the lump with reference to Fig. 3, this USB camera 310 has one first terminal point 311 and one second terminal point 313, with with its picked image data flow, by these two terminal points 311,313 from these usb bus 322 transmission, this host apparatus 320 has a usb bus 322 and a driver element (driver) 321, receiving the imaging data stream that this USB camera 310 is transmitted, and transfer data to this USB camera 310 by this usb bus 322.At first, in steps A, this driver element 321 reads the imaging data stream of this USB camera 310.Wherein, in steps A, this driver element 321 uses a USBCAMD_ReadChannel function, to read the imaging data stream of this USB camera, wherein, 320 of this USB camera 310 and this host apparatus with etc. the time type transmission (isochronous transfer) transmit data.
In step B, 321 pairs of these first terminal points 311 of this driver element and this second terminal point 313 produce one and read the extension data structure, in order to this first terminal point of handling this USB camera 310 and the package of this second terminal point, wherein, in step B, this driver element produces this USBCAMD_ReadExtension and reads the extension data structure, in order to the package of two terminal points handling this USB camera.
Fig. 5 is the schematic diagram of USBCAMD_ReadExtension data structure of the present invention.Fig. 6 is the schematic diagram of the present invention _ USBCAMD_DUALISO_EXTENSION data structure.Fig. 7 is the schematic diagram of USBCAMD_ReadChannel data structure of the present invention.Wherein, pISO1, pISO2, ISO1_Start, ISO2_Start ... in order to handle this first buffering area 323 and this second buffering area 325.Those skilled in the art can know the relevant running of the package of these driver element 321 these first terminal points of processing and this second terminal point according to data structure of the present invention, do not repeat them here.
In step C, this driver element 321 is sent the package of receiving via this usb bus 322.
In step D, this driver element 321 is handled the package of this first terminal point 311 and this second terminal point 313 respectively, and with the data in the package of the package of first terminal point 311 and second terminal point 313, is copied to one first buffering area 323 and one second buffering area 325.
In step e, this driver element 321 judges whether the package of this first terminal point 311 has an end picture frame flag 327 to be set, and whether the package of this second terminal point 313 has an end picture frame flag 329 to be set.
In step F, this end picture frame flag 327 in the package of these driver element 321 these first terminal points 311 of judgement is set, and this end picture frame flag 329 in the package of this second terminal point 313 is set, this driver element 321 synthesizes a picture frame with the data set in this first buffering area 323 and this second buffering area 325, and sends this host apparatus 320 to.
In step e, when this driver element 321 judge that this end picture frame flag 327 in the package of these first terminal points 311 is not set as yet or the package of this second terminal point 313 in this end picture frame flag 329 be not set this driver element 321 execution in step C as yet.
Fig. 8 is the detail flowchart of step D of the present invention.In step D1, call out a USBCAMD_TransferComplete function, with the transmission of the package that finishes this first terminal point 311.When this driver element 321 after this first terminal point 311 sends the requirement of wanting data, promptly can jump to other Thread (Thread) and do other thing.After operating system was waited until and from this first terminal point 311 Data Receiving finished, operating system was called out the USBCAMD_TransferComplete function again, and rebound USBCAMD_TransferComplete function is in order to handle the data of just having received.
In step D3, whether this package is a new picture frame package among the determining step D1.If judge among the step D3 when this package is not a new picture frame package, in step D5, the data in the package of first terminal point 311 be copied to this first buffering area 323, setting USBCAMD_ReadExtension data structure relevant field, and resumes step C.
If judge among the step D3 when this package is a new picture frame package, whether in step D7, judging in the package of this second terminal point 313 has an end picture frame flag 329 to be set again.
In step D7, if this end picture frame flag 329 in the package of this second terminal point 313 of judgement is not set, then this in the package of this first terminal point 311 of setting finishes picture frame flag 327 in step D9, and execution in step D11.
This end picture frame flag 329 in step D7 in the package of this second terminal point 313 of judgement is set, and then calls out a USBCAMD_CompleteReadRequest function and execution in step D11 in step D15.
In step D11, judge whether a new extension data structure that reads of this first terminal point 311.
If step D11 judges the new extension data structure that reads that this first terminal point 311 is arranged, then in step D13 reading of data and set information to this new extension data structure and resumes step C of reading.If in step D11,, then in step D17, produce a new extension data structure and the resumes step D13 of reading if judge the new extension data structure that reads do not have this first terminal point 311.
In step D21, call out a USBCAMD_TransferComplete function, in order to the transmission of the package that ends at this second terminal point 313.
In step D23, whether this package is a new picture frame package among the determining step D21.If judge among the step D23 when this package is not a new picture frame package, in step D25,, be copied to this second buffering area 325 with the data in the package of second terminal point 313, and set USBCAMD_ReadExtension data structure relevant field, follow resumes step C.
If in step D23, judge when this package is a new picture frame package, in step D27, judge again whether the package of this first terminal point 311 has an end picture frame flag 327 to be set.
In step D27, if this end picture frame flag 327 in the package of this first terminal point 311 of judgement is not set, then this in the package of this second terminal point 313 of setting finishes picture frame flag 329 in step D29, and execution in step D31.
This end picture frame flag 329 in step D27 in the package of this first terminal point 311 of judgement is set, and then calls out a USBCAMD_CompleteReadRequest function and execution in step D31 in step D35.
In step D31, judge whether a new extension data structure that reads of this second terminal point 313.
If step D31 judges the new extension data structure that reads that this second terminal point 313 is arranged, then in step D33 reading of data and set information to this new extension data structure and resumes step C of reading.If in step D31,, then in step D37, produce a new extension data structure and the resumes step D33 of reading if judge the new extension data structure that reads do not have this second terminal point 313.
When judging that in step D3 this package is a new picture frame package and when this end picture frame flag 329 in the package of this second terminal point of judgement is set in step D7, represent that the picture frame package that this first terminal point 311 and this second terminal point 313 are transmitted has finished, transmit to finish drawing frame data so in step D15, call out a USBCAMD_CompleteReadRequest function.At step D23 also is so, repeats no more.
Fig. 9 is USB of the present invention schematic diagram during type transmission when first-class, and it uses a usb protocol analyzer to measure USB and obtains.As shown in Figure 9, the transmission of package 10 (transfer) comprises transmission (transaction) 5, transmits 6, transmits 7, transmits 8, transmits 9, reaches and transmit 10.The transmission of package 23 (transfer) comprises transmission (transaction) 11, transmits 12, transmits 13, transmits 14, transmits 15, reaches and transmit 16.Transmit 5, transmit 6, transmit 7, transmit 11, transmit 12, transmit 13 these first terminal points 311, transmit 8, transmit 9, transmit 10, transmit 14, transmit 15, and transmit 16 then from this second terminal point 313 of this USB camera 310 from this USB camera 310.
Figure 10 is the schematic diagram of driver element 321 deal with data of the present invention.Driver element will transmit (transaction) 5, transmission 6 in regular turn and transmit 7 data composition package 1, transmission (transaction) 8, transmission 9 and transmit 10 data composition package 2.Thereafter step is identical, repeats no more.
In sum, prior art is owing to have only a terminal point, so its maximum transmitting bandwidth is 24MB/sec, by finding out among Fig. 1, in transmission (transfer) time (125 μ sec), three transmission (transaction) can only be arranged at most.Yet, USB camera 310 existing this first terminal point 311 and this second terminal points 313 of the present invention, it is provided with the transmitting bandwidth that (USBConfiguration) can obtain 48MB/sec at USB, that is the transmitting bandwidth of twice, by can obviously finding out among Fig. 9, in transmission (transfer) time (125 μ sec), the multipotency of the present invention has six transmission (transaction), and it is respectively that from this first terminal point 311 three transmit and from three transmission of this second terminal point 313.
The driver of existing USB digital camera can only be supported a terminal point, makes it have two terminal points even existing digital camera increases computer hardware, and it is subjected to the restriction of existing driver, also can't operate as normal under two terminal point situations arranged.
By above stated specification as can be known, the invention provides the camera system and the method for type USB (USB) when a kind of employing is two to be waited, it makes a USB digital camera have two terminal points, change simultaneously has the driver of USB digital camera now, thereby can increase transmission speed, in order to apace image is sent to a host side in camera system.
From the above, no matter the present invention all show it totally different in the feature of prior art, has practical value with regard to purpose, means and effect.But it should be noted that above-mentioned many embodiment only give an example for convenience of explanation, the interest field that the present invention advocated should be as the criterion so that claims are described certainly, but not only limits to the foregoing description.
Claims (11)
1. the image capture method of a USB such as type when adopting two the grade, it is applied to transmit data between a USB camera and a host apparatus, this USB camera has one first terminal point and one second terminal point, in order to its picked image data flow, transmit by this first terminal point and this second terminal point, this host apparatus has a usb bus and a driver element, and to receive this imaging data stream that this USB camera is captured, this method comprises by this usb bus:
A) this driver element reads this imaging data stream of this USB camera, in steps A) in, this driver element uses a USBCAMD_ReadChannel function, in order to read this imaging data stream of this USB camera;
B) this driver element produces corresponding one to this first terminal point and this second terminal point respectively and reads the extension data structure, in order to this first terminal point of handling this USB camera and the package of this second terminal point;
C) this driver element is sent the package of receiving via this usb bus;
D) this driver element is handled the package of this first terminal point and this second terminal point respectively, and it is copied to one first buffering area and one second buffering area;
Whether E) this driver element judges in the package of this first terminal point that one finishes the picture frame flag and whether is set, and one finish the picture frame flag and be set in the package of this second terminal point; And
F) judging this end picture frame flag in the package of this first terminal point when this driver element is set, and this end picture frame flag in the package of this second terminal point is set, this driver element synthesizes a picture frame with the data set in this first buffering area and this second buffering area, and then sends this host apparatus to;
Wherein, step D) also comprise:
D1) call out a USBCAMD_TransferComplete function, in order to the transmission of the package that ends at this first terminal point;
D3) whether this package is a new picture frame package determining step D1); And
D5) if step D3) be judged as not, the package of this first terminal point is copied to this first buffering area, and resumes step C).
2. the image capture method of employing as claimed in claim 1 is two when waiting type USB, it is characterized in that, in step F) in, judging this end picture frame flag in the package of this first terminal point when this driver element is not set, or this end picture frame flag in the package of this second terminal point is not set this driver element execution in step C).
3. the image capture method of employing as claimed in claim 2 is two when waiting type USB is characterized in that, between this USB camera and this host apparatus when waiting the type transmission in order to the transmission data.
4. the image capture method of employing as claimed in claim 3 is two when waiting type USB is characterized in that step D) also comprise:
D7) if step D3) in judge that this package is aforementioned new picture frame package, judge that more whether having this end picture frame flag in the package of this second terminal point is set;
D9), then set this end picture frame flag in the package of this first terminal point if judging this end picture frame flag in the package of this second terminal point is not set; And
D11) judge whether the one new extension data structure that reads is arranged in this first terminal point; And
D13) if step D11) judge that in this first terminal point the aforementioned new extension data structure that reads is arranged, then reading of data and set information are to this new extension data structure and resumes step C of reading).
5. the image capture method of employing as claimed in claim 4 is two when waiting type USB is characterized in that step D) also comprise:
D15) if this end picture frame flag in the package of this second terminal point of judgement is set, then call out a USBCAMD_CompleteReadRequest function, and execution in step D11).
6. the image capture method of employing as claimed in claim 4 is two when waiting type USB is characterized in that step D) also comprise:
D17) at step D11) in, if judge the new extension data structure that reads do not have this first terminal point, then produce aforementioned new extension data structure and the resumes step D13 of reading).
7. the image capture method of employing as claimed in claim 3 is two when waiting type USB is characterized in that step D) also comprise:
D21) call out a USBCAMD_TransferComplete function, in order to the transmission of the package that finishes this second terminal point;
D23) whether this package is a new picture frame package determining step D21); And
D25) if step D23) be judged as not, the package of this second terminal point is copied to this second buffering area, and resumes step C).
8. the image capture method of employing as claimed in claim 7 is two when waiting type USB is characterized in that step D) also comprise:
D27) if at step D23) in this package of judgement be this new picture frame package, whether the package of judging this first terminal point again has this end picture frame flag is set;
D29), then set this end picture frame flag in the package of this second terminal point if judging this end picture frame flag in the package of this first terminal point is not set; And
D31) judge whether a new extension data structure that reads of this second terminal point; And
D33) if step D31) judge have this second terminal point should be new read the extension data structure, reading of data and set information this new extension data structure and resumes step C of reading extremely then).
9. the image capture method of employing as claimed in claim 8 is two when waiting type USB, in it is characterized in that, step D) also comprise:
D35) at step D27) in judge that this end picture frame flag in the package of this first terminal point is set, then call out a USBCAMD_CompleteReadRequest function, and execution in step D31).
10. the image capture method of employing as claimed in claim 9 is two when waiting type USB is characterized in that step D) also comprise:
D37) at step D31) in if judge this that do not have this second terminal point new read the extension data structure, then produce this new extension data structure and resumes step D33 of reading).
11. the camera system of type USB during two grade of employing mainly comprises:
One USB camera, it has first terminal point and second terminal point, in order to imaging data stream, transmits by this first terminal point and this second terminal point; And
One host apparatus, it has a usb bus and a driver element, by this usb bus in order to receive this imaging data stream of this USB camera, wherein, between this USB camera and this host apparatus with etc. the time type transmission carry out the transmission of data, this driver element uses a USBCAMD_ReadChannel function, in order to read this imaging data stream of this USB camera;
Wherein, when this driver element reads this imaging data stream in this USB camera, and this first terminal point and this second terminal point are produced one read the extension data structure, in order to handle the package that is transmitted by this first terminal point and this second terminal point, and then send the package of receiving via this usb bus, and the package of this first terminal point and the package of this second terminal point be copied to one first buffering area and one second buffering area respectively, in the middle of, when this driver element judge that end picture frame flag in the package of this first terminal point is set and the package of this second terminal point in end picture frame flag be set, this driver element and then with the synthetic picture frame of the data set in this first buffering area and this second buffering area, and send this host apparatus to.
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| US5987530A (en) * | 1997-07-10 | 1999-11-16 | National Instruments Coporation | Method for caching data and generating only one read request to read the requested data and additional data in universal serial bus system |
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| TW200517851A (en) * | 2003-11-20 | 2005-06-01 | Sunplus Technology Co Ltd | Method and system for transmitting data through multi-path bus |
| CN1947423A (en) * | 2003-12-22 | 2007-04-11 | 皇家飞利浦电子股份有限公司 | Disc allocation/scheduling for layered video |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3415567B2 (en) * | 2000-06-21 | 2003-06-09 | エヌイーシーマイクロシステム株式会社 | USB transfer control method and USB controller |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5996031A (en) * | 1997-03-31 | 1999-11-30 | Ericsson Inc. | System and method for the real time switching of an isochronous data stream |
| US5987530A (en) * | 1997-07-10 | 1999-11-16 | National Instruments Coporation | Method for caching data and generating only one read request to read the requested data and additional data in universal serial bus system |
| TW200517851A (en) * | 2003-11-20 | 2005-06-01 | Sunplus Technology Co Ltd | Method and system for transmitting data through multi-path bus |
| CN1947423A (en) * | 2003-12-22 | 2007-04-11 | 皇家飞利浦电子股份有限公司 | Disc allocation/scheduling for layered video |
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