Source: http://www.google.com/patents/US8156238?dq=U.S.+Patent+No.+4,528,643
Timestamp: 2014-03-09 13:42:05
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Matched Legal Cases: ['Application No. 61', 'Application No. 200405099', 'Application No. 200405336', 'Application No. 200401969', 'Application No. 200401973', 'Application No. 200401979', 'Application No. 200402060', 'Application No. 200402061', 'Application No. 200401975', 'Application No. 200401969', 'Application No. 200410047784', 'Application No. 200410038432', 'Application No. 200410038546', 'application No. 200410044503', 'Application No. 200410071497', 'Application No. 04255786', 'Application No. 04252205', 'Application No. 04251582', 'Application No. 04252056', 'Application No. 04252202', 'Application No. 04252057', 'Application No. 04252203', 'Application No. 04252054', 'Application No. 10162586', 'Application No. 04252055', 'Application No. 04255609', 'Application No. 04255611', 'Application No. 04251581', 'Application No. 04252054', 'Application No. 04252056', 'Application No. 04252057', 'Application No. 04252202', 'Application No. 04252203', 'Application No. 200402057', 'Application No. 04255609', 'Application No. 04252055', 'Application No. 200410044503', 'Application No. 200410044503', 'Application No. 200410043419', 'Application No. 200410045686', 'Application No. 200410087460', 'Application No. 200410038545', 'Application No. 04252205', 'Application No. 200410038545', 'Application No. 200410095171', 'Application No. 200410043419', 'Application No. 200410071498', 'Application No. 2004100950502', 'Application No. 200410095171', 'Application No. 200410044503', 'Application No. 200401166', 'Application No. 08153454', 'Application No. 04255786', 'Application No. 04255610', 'Application No. 04255609', 'Application No. 08153726', 'Application No. 08155263', 'Application No. 08153724', 'Application No. 200405336', 'Application No. 08155262', 'Application No. 04255610', 'Application No. 200405115', 'Application No. 200405129']

Patent US8156238 - Wireless multimedia transport method and apparatus - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inAdvanced Patent SearchPatentsApparatus and methods for wireless data transmission in a multimedia network are disclosed. Disclosed is a network having a source coupled to a sink using a virtual channel that includes a wireless communication channel. A source end of the system provides a packetizing data stream having a stream of...http://www.google.com/patents/US8156238?utm_source=gb-gplus-sharePatent US8156238 - Wireless multimedia transport method and apparatusAdvanced Patent SearchPublication numberUS8156238 B2Publication typeGrantApplication numberUS 12/767,429Publication dateApr 10, 2012Filing dateApr 26, 2010Priority dateMay 13, 2009Also published asCN101888514A, CN101888514B, EP2252028A1, US20100293287, US20120163188Publication number12767429, 767429, US 8156238 B2, US 8156238B2, US-B2-8156238, US8156238 B2, US8156238B2InventorsOsamu KobayashiOriginal AssigneeStmicroelectronics, Inc.Export CitationBiBTeX, EndNote, RefManPatent Citations (104), Non-Patent Citations (151), Referenced by (1), Classifications (8), Legal Events (1) External Links: USPTO, USPTO Assignment, EspacenetWireless multimedia transport method and apparatusUS 8156238 B2Abstract Apparatus and methods for wireless data transmission in a multimedia network are disclosed. Disclosed is a network having a source coupled to a sink using a virtual channel that includes a wireless communication channel. A source end of the system provides a packetizing data stream having a stream of payloads such that each payload is associated with its respective originating source stream. The system configured to encode the packetized data stream for wireless transport. A non-wireless source end of the system receives quality of service information from downstream. Thereby enabling adjustments to the source content and packetized data streams.
What is claimed is: 1. A multimedia data transmission system, for use in a multimedia source device, comprising:
CROSS REFERENCE TO RELATED APPLICATIONS This patent application takes priority under 35 U.S.C. 119(e) to U.S. Provisional Patent Application No. 61/177,977 filed on May 13, 2009, entitled �WIRELESS MULTIMEDIA TRANSPORT METHOD� by Osamu Kobayashi, which is hereby incorporated by reference herein in its entirety. This application is also related to the following co-pending U.S. patent applications each of which are incorporated by reference, (i) U.S. Pat. No. 7,424,558, filed Dec. 2, 2003 and issued Sep. 9, 2008, entitled �METHOD OF ADAPTIVELY CONNECTING A VIDEO SOURCE AND A VIDEO DISPLAY� naming Osamu Kobayashi as inventor; (ii) U.S. Pat. No. 7,068,686, filed Dec. 2, 2003 and issued Jun. 27, 2006, entitled �METHOD AND APPARATUS FOR EFFICIENT TRANSMISSION OF MULTIMEDIA DATA PACKETS� naming Osamu Kobayashi as inventor; (iii) U.S. Pat. No. 7,620,062, filed on Dec. 2, 2003 and issued Nov. 17, 2009, entitled �METHOD OF OPTIMIZING MULTIMEDIA PACKET TRANSMISSION RATE� naming Osamu Kobayashi as inventor; (iv) U.S. Pat. No. 7,088,741, filed Dec. 2, 2003 and issued Aug. 8, 2006, entitled �USING AN AUXILIARY CHANNEL FOR VIDEO MONITOR TRAINING� naming Osamu Kobayashi as inventor; (v) U.S. patent application Ser. No. 10/726,350, filed on Dec. 2, 2003, entitled �TECHNIQUES FOR REDUCING MULTIMEDIA DATA PACKET OVERHEAD� naming Osamu Kobayashi as inventor; (vi) U.S. patent application Ser. No. 10/726,362, filed on Dec. 2, 2003, entitled �PACKET BASED CLOSED LOOP VIDEO DISPLAY INTERFACE WITH PERIODIC STATUS CHECKS� naming Osamu Kobayashi as inventor; (vii) U.S. patent application Ser. No. 10/726,895, filed Dec. 2, 2003, entitled �MINIMIZING BUFFER REQUIREMENTS IN A DIGITAL VIDEO SYSTEM� naming Osamu Kobayashi as inventor; (viii) U.S. patent application Ser. No. 10/726,441, filed Dec. 2, 2003, entitled �VIDEO INTERFACE ARRANGED TO PROVIDE PIXEL DATA INDEPENDENT OF A LINK CHARACTER CLOCK� naming Osamu Kobayashi as inventor; (ix) U.S. Pat. No. 6,992,987, filed Dec. 2, 2003 and issued Jan. 31, 2006, entitled �ENUMERATION METHOD FOR THE LINK CLOCK RATE AND THE PIXEL/AUDIO CLOCK RATE� naming Osamu Kobayashi as inventor; (x) U.S. patent application Ser. No. 10/726,794, filed on Dec. 2, 2003, entitled �PACKET BASED VIDEO DISPLAY INTERFACE AND METHODS OF USE THEREOF� naming Osamu Kobayashi as inventor; (xi) U.S. Pat. No. 7,487,273, filed on Jul. 29, 2004 and issued Feb. 3, 2009, entitled �DATA PACKET BASED STREAM TRANSPORT SCHEDULER WHEREIN TRANSPORT DATA LINK DOES NOT INCLUDE A CLOCK LINE� naming Osamu Kobayashi as inventor; and (xii) U.S. patent application Ser. No. 12/365,678 filed on Feb. 4, 2009, entitled �MULTI-STREAM DATA TRANSPORT AND METHODS OF USE� naming Osamu Kobayashi as inventor.
FIELD OF THE INVENTION The invention relates to wireless data transmission in multimedia networks. More specifically, the invention describes wireless video data transmission in a multimedia device network and method of stream packet delivery with a data packet stream scheduler and methods of use thereof.
BACKGROUND OF THE INVENTION Modernly, devices transmitting multi-media (audio, video, images, viewable data, etc.) have come into common and widespread usage. Additionally, wireless data transmission methods and devices have come into widespread usage for transmitting a wide array of data types. More recently, such wireless technologies have come into use with video and other multi-media data.
SUMMARY OF THE INVENTION A multimedia data transmission system of the invention includes a multimedia source module for providing source multimedia content comprising at least one multimedia data stream arranged in a packetized data stream. One source module can include a transmitter for transmitting the packetized data stream to a wireless transceiver. Also, a source quality of service receiver is included for receiving quality of service information from said source wireless transceiver. The system further includes a wireless transceiver for receiving said packetized data stream from the source module and transmitting it to a sink wireless device. The transceiver comprising wireless receiver circuitry capable of receiving downstream quality of service information from a sink wireless device in wireless communication with the wireless transceiver. Also, the wireless transceiver includes transmitter circuitry for transmitting quality of service information further upstream to the source module. Also, the system includes a data linking unit for coupling the multimedia source module with the source wireless transceiver. The linking unit having a unidirectional main link for transporting the packetized data stream from the source module to the wireless transceiver and at least one supplementary link (sideband channel) for transmitting the quality of service information from wireless transceiver upstream to the source module.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows a generalized representation of a multimedia network having a virtual channel with wireless data connections.
DETAILED DESCRIPTION OF SELECTED EMBODIMENTS Reference will now be made to particular embodiments of the invention, several examples of which are illustrated in the accompanying drawings. While the invention will be described in conjunction with particular embodiments, it will be understood that the invention is not intended to be limited to the described embodiments. On the contrary, it is intended to cover alternatives, modifications, and equivalents as may be included within the spirit and scope of the invention as defined by the appended claims.
In one particular implementation, the quality of service channel 213 can comprise a bi-directional auxiliary line of the linking unit 203. Additionally, the other line 214 can simply be a linking unit line used for sending hot plug connection signals. Instead of a hot plug signal, the line 214 can simply send a message (e.g., an interrupt request (IRQ)) that the source 201 will treat as a quality of service �alert� signal. Responsive to the alert signal, the source module 201 is enabled to read the incoming quality of service information from the auxiliary line 213.
In this particular embodiment a data channel defines a communication channel between the source 301, data linking unit 303, interface 300, and the wireless communication line with the sink 309. With continued reference to FIG. 3, a mode of operation for the interface 300 is now described. To begin, the source 301 generates a packetized data stream 321 which is output from the source 301. It is transported to the interface 301 via a main link of the data linking unit 303. The interface 300 includes a �wired interface� 311 which is really just a non-wireless interface that can be an optical interface of a wired connection but is not a wireless interface. It is pointed out that the wired interface 311 is linked to the wireless interface 312 using a data linking unit 319 of a type well described previously.
The �wired interface� 311 includes receiver circuitry 313 configured to receive the packetized data streams 321 from the source 301. The receiver circuitry 313 can be configured an independent device or as is the case in many embodiments, be configured as a portion of a transceiver 315. As indicated, this packetized data 321 can be received by the receiver circuitry 313 through the main link of the data linking unit 303. The packetized data stream 321 is then forwarded (by the transmitter 314 of the transceiver 315) to a wireless interface 312. Typically, this data stream 321 is transmitted from the wired interface 311 to the wireless interface 312 using the main link of another data linking unit 319 within device 300. More particularly, this data 321 is received by a receiver 316 of the wireless interface 312. This packetized data stream 321 is then passed on to a wireless encoder 317 that configures the packetized data stream 321 as a wireless data stream suitable for wireless transmission. As indicated previously, such an encoder 317 can format the packetized data stream 321 into any supported wireless transport protocol, including but are not limited to Bluetooth, WiFi, and other wireless compatible data transmission formats. This wireless data stream is forwarded to transmission circuitry 318 that wirelessly transmits the stream 306 t to a wireless sink device 309 that consumes or otherwise acts upon the wireless data. In some implementations, the receiver 316, the wireless encoder 317, and wireless transmission circuitry 318 can form a single integrated component.
In this transport methodology the data to header ratio is extremely high. This is accomplished by stripping the header information down to the absolute minimum and then transmitting all of the associated attribute data separate from the data. One example takes advantage of linking device having a data main link and an associated auxiliary link. In such a linking device, the auxiliary line can transfer the stream attribute data from the source to the receiver prior to the transmission of the data packets by way of the main link. In another embodiment, the data attribute information can be sent over the main link in a manner that does not decrease the data rate of the source data. One approach takes advantage of the fact that the transfer units are transmitted in a constant stream, whether in the active or blanking portions of a source AV blanking cycle. When the transfer units are transmitted during the blanking period of the blanking cycles they do not carry audio video (AV) data. Aspects of the invention can take advantage of these �blank� portions to send data attribute information. Thus, not using up data bandwidth over the main link. These approaches will all be discussed in greater detail in the paragraphs that follow.
This format can support laptop/all-in-one as well as HDTV and other consumer electronics applications. In addition to providing video and graphics data, display timing information can be embedded in the digital stream providing essentially perfect and instant display alignment, obviating the need for features like �Auto-Adjust� and the like. The transfer unit based nature of the inventive interface provides scalability to support multiple, digital data streams such as multiple video/graphics streams and audio streams for multimedia applications. In addition, a universal serial bus (USB) transport for peripheral attachment and display control can be provided without the need for additional cabling.
It should also be noted that the relative size of each payload in a transfer unit provides an embedded time stamp in that by counting the number of data symbols for each payload with respect to the total length of the transfer unit (e.g., 64 symbols) provides a stream clock for the data stream associated with the respective payload. Thus, even for a series of payloads from a plurality of source data streams all populating the same transfer unit, the native rate of the source streams can be recovered. In one example case a stream clock Fstream � clk for a particular data stream can be simply recovered by determining the number of data symbols (M) of a payload as compared to the total number of symbols for the transfer unit (T) and associated with the link rate of the channel Fchannel � clk. More particularly, the stream clock Fstream � clk is determined by the following:
F stream � clk=(M/T)*F channel � clk where M and P can be measured by the receiver 204. Table 2 below is a brief summary of the control symbols used in accordance with the principles of the invention as disclosed above.
In typical systems, adjustments are made at the wireless transmitter 623 but go no further. Indeed in the current state of the art there is no method for transmitting quality of service information upstream (toward the content source 601, 611). In this embodiment, the quality of service information is transmitted upstream using a �wired� connection. In this example, a �wired� connection is to say non-wireless connection. In one implementation, the quality of service information is transmitted from 623 to 621 (as signal 652); from 621 to 614 (as signal 653); and from 614 to 611 (as signal 654). For example, using supplementary channels of the aforementioned data linking units. Alternative embodiments may simply include a quality of service line connected directly from the transceiver 623 to source 611. However, the depicted implementation works very well with existing implementations using the already existing data linking units. In one non-limiting example, using a DisplayPort compatible linking unit, the packetized data streams are transmitted downstream (toward the sink 604) using the main link and the quality of service information can be transmitted back upstream using, for example, the auxiliary line of the linking unit.
Also, as a specifically attractive enhancement, each upstream system (e.g., 621, 614, 611) can be alerted that there is downstream quality of service information available. For example, a hot plug detection line of the linking unit can be used to send a �quality of service alert� message to upstream systems to alert them to the presence of quality of service information. In one implementation, the alert message can simply be a hot plug IRQ message sent through the hot plug detect line forming a part of an ordinary data linking unit. Such an alert can be transmitted from 623 to 621 (as signal 662); from 621 to 614 (as signal 663); and from 614 to 611 (as signal 664). This alert message can enable the upstream systems to understand quality of service information is to be received. Also, the alert can initiate a process for acting upon it (e.g., passing the quality of service information further upstream and/or adjusting the system to accommodate changes in the channel 624 condition). In one particular embodiment, as discussed above, in response to the quality of service information, the source content originator 611 can adjust at least one of said source multimedia content 612 or said packetized data stream 613 in response to the quality of service information. As also indicated, refresh rates can be adjusted, resolution of the signal can be adjusted, packets can be selectively deleted from the data stream, and so on. Thus, the entire system becomes very responsive to changing wireless link conditions.
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