Source: https://patents.google.com/patent/US20090209205A1/en
Timestamp: 2019-12-13 03:46:32
Document Index: 168405891

Matched Legal Cases: ['Application No. 61', 'art 10', 'ART) 426', 'art 10', 'art 10', 'art 10']

US20090209205A1 - Method and apparatus for transporting video signal over bluetooth wireless interface - Google Patents
Method and apparatus for transporting video signal over bluetooth wireless interface Download PDF
US20090209205A1
US20090209205A1 US12/348,627 US34862709A US2009209205A1 US 20090209205 A1 US20090209205 A1 US 20090209205A1 US 34862709 A US34862709 A US 34862709A US 2009209205 A1 US2009209205 A1 US 2009209205A1
US12/348,627
US8355671B2 (en
Wilfred I. Tucker
Sample John M
Tucker Wilfred I
Jacobsen Jeffrey J
2008-01-04 Priority to US1017708P priority Critical
2008-05-14 Priority to US12/152,462 priority patent/US9116340B2/en
2009-01-05 Application filed by Mark Kramer, Sample John M, Tucker Wilfred I, Jacobsen Jeffrey J filed Critical Mark Kramer
2009-01-05 Priority to US12/348,627 priority patent/US8355671B2/en
2009-08-20 Publication of US20090209205A1 publication Critical patent/US20090209205A1/en
2012-02-02 Assigned to KOPIN CORPORATION reassignment KOPIN CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: JACOBSEN, JEFFREY J.
2013-01-15 Publication of US8355671B2 publication Critical patent/US8355671B2/en
A wireless wearable video headset device useful for viewing and listening to multimedia content. In one embodiment, the device operates by receiving a digital encoded audio/video signal from a host device of a Bluetooth™ wireless connection, the Bluetooth™ connection established via a Serial Port Profile (SPP), and the digital video signal having been previously compressed with Windows Media Video (WMV) or H. 264 compliant compression. The received digital audio/video signal is then forwarded over a Universal Serial Bus (USB) connection to an internal processor which then decompressed video content in the digital video signal to generate a component video signal that is suitable for handling by a display driver.
This application claims the benefit of U.S. Provisional Application No. 61/010,177, filed on Jan. 4, 2008 and is a continuation-in-part of U.S. application Ser. No. 12/152,462, filed on May 14, 2008. The entire teachings of the above application(s) are incorporated herein by reference.
In most prior art arrangements, a video headset is connected to a base electronics unit by means of a wire. While this provides a secure communication link with sufficient bandwidth to transport a high quality video signal, the need for a wire limits the mobility of the user. The wire is also inconvenient for the purpose of storage.
A wireless headset, on the other hand, provides greater convenience and mobility and avoids problems, such as broken connecting wires. More particularly, a head mounted display according to an embodiment of the present invention can be configured as a pair of eyeglasses and/or equipped with a set of speakers and/or boom microphone. The display in such a device can include one or more high resolution, Liquid Crystal Display (LCD) panels that can be positioned in front of the viewer's eye(s). The panel(s) can be opaque and/or transparent and/or may be incorporated with normal eyeglass lenses. The panels can comprise all of the lens, only half the lens in a bifocal arrangement, or can be superimposed over a conventionally appearing eyeglass lens.
A wireless communications controller associated with the headset acts as a video link to a host device. The host is any appropriate device that sources video information, such as a cell phone, personal computer (PC), laptop, media player and/or the like. Switches associated with or voice commands received at the device can allow the user to select and navigate menus, play media files, set volume and screen brightness, activate controls for the host target device or perform other commands.
The wireless link must support transmission of video. There has been an assumption in the prior art that quality video requires at least a Video Graphic Array (VGA) type resolution of 640×480 pixels, at a frame rate of at least 30 frames per second (fps). To accomplish this, a connection supporting an apparent ten megabits per second (Mbps) data rate has typically been required. The use of video compression algorithms, such as those specified by the Motion Picture Expert Group (MPEG)-3 or -4 have been used to reduce data rates.
One could consider using various existing wireless networking technologies to provide a physical layer connection between the headset and the controller. These could include the various Institute of Electrical and Electronic Engineers (IEEE)802.11 (WiFi™) standards. A current release, 802.11(g), does provide sufficient bandwidth at the physical layer for transporting VGA quality, MPEG compressed signals. However, adoption of WiFi™ would also require at least two protocol layers higher than a link layer (e.g., at least a transport and network layer), such as Transmission Control Protocol (TCP)/Internet Protocol (IP) (TCP/IP). With this approach, a still higher layer protocol, such as Realtime Transfer Protocol (RTP), would also typically be needed to handle packet synchronization and other functions.
However, example embodiments of the present invention use a Bluetooth™ wireless physical layer. Bluetooth™ has become the most widely-adopted way to interface portable handheld devices to other equipment. Bluetooth™ also offers broader compatibility, lower power consumption, and other advantages over WiFi™. Conversely, Bluetooth™ specifies somewhat lower data rates than WiFi™ which, in a so-called “basic mode”, are not necessarily sufficient to support VGA quality video.
Although various video modes are already built into Bluetooth™, these modes alone are not sufficient for handling VGA or better quality video given their overhead data rates.
For example, the most recent Bluetooth™ specification includes an Enhanced Data Rate (EDR) mode that provides higher physical layer bandwidth that the basic mode. But even the EDR mode of Bluetooth™ does not support processing of a raw video signal with the better known compression algorithms, such as in the preferred embodiments, including the Windows Media Video (WMV) and Motion Picture Experts Group (MPEG)-4 part 10 (H.264) standards. A protocol supporting such compression standards over Bluetooth™ would allow for streaming video at 30 frames per second at National Television System Committee (NTSC) Digital Versatile Disc (DVD) quality (i.e., at least 720×480 resolution).
In addition, a primary concern is transport speed and that all IP layers that might be needed for a generic data connection need may not be provided. Bluetooth™'s inherent EDR mode has guaranteed sequence packet delivery built into its lower protocol layers. Since there is only a need to support a point-to-point connection (i.e., between the headset and the host video source), certain protocol layers can advantageously be stripped out, relying instead on a high-speed serial port interface mode (i.e., Serial Port Profile (SPP)) for packet delivery.
Furthermore, internal high speed interface connections within the controller, such as Serial Peripheral Interface (SPI), universal asynchronous receiver/transmitter (UART) and Universal Serial Bus (USB), can help avoid bottlenecks for data streaming and optimize performance through setting buffer sizes.
FIG. 1 is a diagram illustrating a perspective view of an example embodiment monocular display device that may employ example embodiments of the present invention, and wireless communications between the example embodiment display device and host computing devices.
FIG. 2 is a network diagram illustrating communications between an example embodiment display device and host computing devices, and communications between the host computing devices and other external databases and the Internet for delivery of multimedia content to the monocular display device.
FIG. 1 is a diagram of a display device 100, including a display panel 110. In one embodiment, the display device may be a monocular display device. In such an embodiment, display panel 110 may be mounted to a housing 102 via an adjustable arm 115 and incorporate a headset and earpiece 108. In another embodiment, the display panel 110 may be a handheld microdisplay. More details of the such a monocular display device 100 are provided in U.S. patent application Ser. No. 12/008,114 entitled “Monocular Display Device”, filed Jan. 8, 2008.
The example display device 100, preferably, can establish a two-way or bidirectional wireless communication link 135 with a host computing device 125. Thereafter, the device 100 can send and receive data from and to the host device 125 across the wireless link 135 with a high data transfer rate. The display device 100 can convert the received data across the wireless link to multimedia including graphical video data to display images on the display panel 110, which may originate from the host computing device 125 or, alternatively, from another remove database or source, such as a remote memory.
In one embodiment, the wireless communication link 135 uses short range or long range radiofrequency signals over a designated channel to communicate data between devices 100, 125 in a protocol that is known by both devices 100, 125. Preferably, the radiofrequency signals are low power (e.g., in a range of about 1.0 mWatt to 100 mWatts) so as to transmit the radio frequency signals across a desired distance, which can be from several feet or greater than twenty feet in length.
In another embodiment, the wireless communication link 135 may use Institute of Electrical and Electronics Engineers (IEEE) 802.11(b), IEEE 802.11(g), or other standard. In yet another embodiment, the wireless communication link 135 may include Bluetooth™ 3.0 with a data transfer rate of about 480 Mbps, Ultra-wideband (UWB), Wireless Universal Serial Bus (USB)™, WirelessHD™, Wireless High Definition Multimedia Interface (Wireless HDMI™), WiFi, or any other high speed digital communication standard known in the art. In a further alternative embodiment, the display device 100 may communicate with the host computing system 125 using a wired connection, instead of link 135 such as, for example, a serial port, or a USB cable, or other wired connections. Alternatively, the wireless communication link 135 may include a Code Division Multiple Access (CDMA) standard, a Time Division Multiple Access (TDMA) standard, or Frequency Division Multiple Access (FDMA) standard or, alternatively, any other frequency hopping standard in spread spectrum communication known in the art to communicate data. Various protocol standards for wired and wireless communication are known in the art, and the present device 100 is not limited to any specific link, or radio frequency protocol.
The present display device 100 uses the two-way or bidirectional wireless communication link 135 with the computing device 125 to playback video and audio on the display panel 110. The display device 100 also controls the host computing device 125, such as, for example, a wireless laptop 125 a, to run business applications, retrieve e-mail, and run executable code, and applications from the laptop 125 a across the wireless link 135. In this regard, the display device 100 may include an input device 120 (e.g., input device 335 of FIG. 3) that can transmit a wireless input signal to the host computing device 125. The input signal can control the host computing device 125 to provide control signals to run applications on the host computing device 125. Thereafter, the host computing device 125 outputs a graphical output to the display 110 for a remote display of applications operating at the host computing device 125 at the display device 100, which may be located a distance away from the host computing device 125. Hosts 125 source content 150 of various types for viewing on the display panel 110, including video 150 a, audio 150 b, computer data 150 c, and other types of information, such as calendar 150 d, email and any number of types of data that would regularly be found from hosts 125.
FIG. 2 is a diagram illustrating an example embodiment display device 100 interacting with a host computing device 125. The host computing device 125 obtains information along a bi-directional communication path(s) such as cellular service 200 a, WiFi™ 200 b, satellite service 200 c, broadcast television 200 d, and closed circuit communications 200 e to the Internet 250 or associated databases 255 for which to display content on the display panel 110 of the display device 100.
In one embodiment, the communication path 200 a may be a cellular mobile communication wireless path, and each path may be different or the same relative to the remaining bidirectional communication paths 200 b-200 e. In one embodiment, the host computing device 125 may obtain information using Sprint™ EV-DO Wireless Broadband Connection, and then communicate with the display device 100 using a Bluetooth™ wireless connection 135.
In another embodiment, the communication path 200 b may be a WiFi™ communication path or similar radiofrequency signal communication link. The host computing device 125 may communicate with satellite services providers, digital video recorders, broadcast television providers, or closed circuit communication devices using respective paths 200 c, 200 d, 200 e. Paths 200 a-200 e may also be associated with a public access wireless hot spot.
The host computing device 125 may access a World Wide Web (WWW) server on the Internet 300 along paths 200 a, 200 b, and obtain information, which is held and displayed to the display panel 110 along communication link 135. In one embodiment, the data can be in a known data format such as, for example, Hyper Text Markup Language (HTML), Extensible Markup Language (XML), Joint Photographic Experts Group (JPEG), Waveform (WAV), Audio Interchange File Format (AIFF), Bitmap (BMP), Picture (PICT), Graphic Interchange Format (GIF), and Windows Media Video (WMV), or any other data format suitable for multimedia content including streaming video, and audio. The data can be obtained from the Internet from databases 305 along path 200 f. Various communication path configurations are possible and within the scope of the present disclosure.
The host computing device 125 can send and receive data along a wireless communication path 200 b to the Internet and other system web pages or information databases 300 using HTML along bidirectional communication path 200 b. The host computing device 125 may include Internet browsing software (such as know web browsers including, Microsoft Internet Explorer™, Opera™, Netscape Navigator™, and Mozilla Firefox™) to send and receive data along paths 200 a and 200 b. It should be appreciated that the host computing device 125 may be connected to the Internet by a cellular telephone network, and/or an Internet Service Provider Gateway Server.
Moreover, the present display device 100 may be configured to receive push e-mail, pull e-mail or periodically forwarded e-mail from e-mail accounts, such as, for example MSN™ Hotmail™, Google™ Gmail™, Yahoo!™ mail, AOL™ Mail, or any other e-mail provider or Internet site known in the art along path(s) 200 a through 200 e. In one embodiment, the wireless link 135, or communication paths 200 a through 200 e, may be compatible for use with a Staccato Communication™ UWB USB that includes a radiofrequency (RF) transceiver, a digital baseband, and an interface to provide for wireless connectivity up to 480 Mbps on a single chip footprint, which can be located in the display device 100, or in the host computing device 125.
During an initial stage of operation, a bi-directional wireless link 135 is established between the transmitter of the display device 325 and the receiver of the host computing device 370 and an authentication process occurs across the wireless communication path 135. Thereafter, the display device 100 can wirelessly communicate with the host computing device receiver 370 over a wireless communication link 135, and the host computing device transmitter 365 can transmit signals to the display device receiver 330. In one embodiment, the display device 100, from its transmitter 325, may wirelessly communicate with the host computing device receiver 370 using a Bluetooth™ 2.0 or 3.0 wireless radiofrequency standard. In another embodiment, the display device 100 may wirelessly communicate using a wireless UWB communication link 135, or using short-range radio frequency signals 135.
Display controller 300 outputs control signals to the display panel 110 to display images. This allows the display device 100 to receive data stored on the cache memory 360 of the host computing device 125. When the host computing device 125 is not in use, or switched off, the data viewed on the display device 100 is from the cached memory 360, and not updated. This data may be slightly older and not refreshed through the communication links 200 a through 200 e, as compared with when the host computing device 125 is operational. It should be appreciated that the display device 100 and the host computing device 125 also include audio devices 395, 395′ that receive a control signal and play audio in response thereto.
In the preferred embodiment, the display device 100 includes an Advanced Reduced instruction set computer (RISC) Machine (ARM)/Digital Signal Processor (DSP) 412 (which may be an Open Multimedia Application Platform (OMAP) 3500 series processor, available from Texas Instruments™ of Dallas, Tex.), memory 414, Bluetooth™ interface 416 which may be provided by a Class 2 Bluetooth™ interface available from Cambridge Silicon Radio™ (CSR) of Cambridge, England), display driver 419 (which may, for example, be an SSD1508 display driver available from Kopin Corporation™ of Westborough, Mass.), video level shifter circuits 420, a power supply 422 supported by a batter 424, universal asynchronous receiver/transmitter (UART) 426 (such as may be used for debugging) and memory 415. A Secure Digital (SD), eXteme Digital (xD), USB SD (uSD) memory 417 or other similar interfaces may be used to store application programs, kernel directives, or configuration data, and/or connect to devices such as a digital camera. A number of buttons 430 may be associated with the device (e.g., switch 1/switch 2/switch 3 and reset inputs) and a light-emitting diode (LED) output 432 (LED 1). A VGA or better quality display panel 110 and audio input and output device(s) 460, which may include microphone input 462 and stereo outputs 464, are also provided. The microphone 462 may receive verbal commands from a user to control the display device 100 and/or the host computing device 125.
The signal may be sent over the Bluetooth™ wireless connection established using Serial Port Profile (SPP) from the display device 100 to the host computing device 125, as opposed to using any of the “advanced” Bluetooth™ modes, which provides greater throughput higher than the higher layer protocols imposed by such advanced modes that have been found not to be needed in this application. In the Bluetooth™ radio 416, the video signal received over the Bluetooth™ connection is sent over the USB connection 418 from the interface 416 to the ARM/DSP 412.
The processor 412 may expect the received video content to be encoded with WMV or MPEG-4 part 10 (H.264) formatting, using the so-called baseline profile or better.
In a preferred embodiment, the ARM/DSP processor 412 may use a multi-tasking embedded operating system. The processor 412 operates on the received video signal as follows. An MPEG format container file (e.g., a .MP4 file) is made available. In one preferred embodiment, this can be a proprietary file format, although the specific details of the input .MP4 file format chosen are not important here, as long as the DSP 412 is programmed to correctly process it. The processor 412 then opens a communication port to the host system 125 and receives the file over the USB™ interface 418 from the Bluetooth™ transceiver in the CSR chip 416.
The ARM/DSP 412 can output video in any suitable format such as an 8 bit, International Telecommunication Union Radiocommunication Sector (ITU-R) Recommendation BT. 656 or Society of Motion Picture and Television Engineers (SMPTE) 293M 16 bit YUV progressive scan with separate sync signals, to the display driver 118.
The decompressed video signal can be forwarded over an internal ARM bus of the processor 416. The ARM bus then sends the content directly to the display driver 419 via the SMPTE 293M interface. The Intelligent Interface Controller (I2C) interface 447 is used to configure the display panel 110.
The ARM 412 also outputs the baseband audio to the audio output coder-decoder (codec) module 460. It may take mono or stereo audio input and produce suitable stereo output signals.
While this invention has been particularly shown and described with references to example embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the scope of the invention encompassed by the appended claims. For example, it should be understood that the display device 100 may be any device capable of displaying video content from a host computing device 125, such as, wireless headset devices, monocular display devices, remote displays, wireless portable DVD player screens, and security system displays.
receiving a compressed digitally-encoded audiovisual signal of at least Video Graphic Array (VGA) quality from an external host computing device over a Serial Port Profile (SPP) Bluetooth wireless connection;
decompressing the compressed digitally-encoded audiovisual signal; and
generating a video signal that is suitable for handling by a display driver in a display device.
2. The method of claim 1 wherein the display device is a monocular display supported on a head of a user.
3. The method of claim 1 wherein the compressed digitally-encoded audiovisual signal is compressed according to Windows Media Video (WMV) or Motion Picture Experts Group (MPEG)-4 part 10 (H.264) standards.
4. The method of claim 3 wherein the Bluetooth wireless connection includes at least two radiofrequency (RF) channels.
receiving the compressed digitally-encoded audiovisual signal over a first RF channel; and
receiving and transmitting control signals over a second RF channel.
6. The method of claim 1 further comprising forwarding the compressed digitally-encoded video signal over a high speed interface prior to decompression.
7. The method of claim 6 wherein the high speed interface is selected from a group consisting of Serial Peripheral Interface (SPI), universal asynchronous receiver/transmitter (UART) and Universal Serial Bus (USB).
8. The method of claim 6 further comprising multiplexing the compressed digitally-encoded audiovisual signal and other data over the high speed connection.
9. The method of claim 1 further comprising generating a component video signal for display.
10. The method of claim 1 further comprising reading at least one of an application program, kernel directive, or configuration data from a memory.
11. The method of claim 10 wherein the memory is a removable memory.
12. The method of claim 11 wherein the removable memory is a read only memory (ROM).
13. The method of claim 1 wherein the steps of the method are carried out in a multi-tasking embedded operating system.
14. The method of claim 1 wherein the compressed digitally-encoded audiovisual signal includes a monaural or stereo audio channel, the method further comprising generating a monaural or stereo audio output.
a Bluetooth transceiver configured to receive a compressed digitally-encoded audiovisual signal of at least Video Graphic Array (VGA) quality from an external host computing device over a Serial Port Profile (SPP) Bluetooth wireless connection; and
a processor configured to decompress the compressed digitally-encoded audiovisual signal and generate a video signal that is suitable for handling by a display driver in a display device.
16. The apparatus of claim 15 wherein the display device is a monocular display coupled to a support structure configured to support the monocular display device on a head of a user.
17. The apparatus of claim 15 wherein the compressed digitally-encoded audiovisual signal is compressed according to Windows Media Video (WMV) or Motion Picture Experts Group (MPEG)-4 part 10 (H.264) standards.
18. The apparatus of claim 17 wherein the Bluetooth wireless connection includes at least two radiofrequency (RF) channels.
19. The apparatus of claim 18 wherein the Bluetooth transceiver is further configured to receive the compressed digitally-encoded audiovisual signal over a first RF channel and receive and transmit control signals over a second RF channel.
20. The apparatus of claim 15 further comprising a high speed interface over which the compressed digitally-encoded video signal may be forwarded from the Bluetooth transceiver to the processor for decompression.
21. The apparatus of claim 20 wherein the high speed interface is selected from a group consisting of Serial Peripheral Interface (SPI), universal asynchronous receiver/transmitter (UART) and Universal Serial Bus (USB).
22. The apparatus of claim 20 wherein the compressed digitally-encoded audiovisual signal and control signals are multiplexed over the high speed connection.
23. The apparatus of claim 15 further comprising a display driver configured to generate a component video signal for display.
24. The apparatus of claim 15 further comprising memory storing at least one of an application program, kernel directive, or configuration data.
25. The apparatus of claim 24 wherein the memory is removable memory.
26. The apparatus of claim 25 wherein the removable memory is read only memory (ROM).
27. The apparatus of claim 15 wherein the processor further comprises a multi-tasking embedded operating system.
28. The apparatus of claim 15 wherein the compressed digitally-encoded audiovisual signal includes a monaural or stereo audio channel, the apparatus further comprising a coder-decoder (codec) configured to generate a monaural or stereo audio output.
means for receiving a compressed digitally-encoded audiovisual signal of at least Video Graphic Array (VGA) quality from an external host computing device over a Serial Port Profile (SPP) Bluetooth wireless connection;
means for decompressing the compressed digitally-encoded audiovisual signal; and
means for generating a video signal that is suitable for handling by a display driver.
US12/348,627 2007-05-14 2009-01-05 Method and apparatus for transporting video signal over Bluetooth wireless interface Active 2031-02-05 US8355671B2 (en)
US1017708P true 2008-01-04 2008-01-04
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US12/152,462 Continuation-In-Part US9116340B2 (en) 2007-05-14 2008-05-14 Mobile wireless display for accessing data from a host and method for controlling
US20090209205A1 true US20090209205A1 (en) 2009-08-20
US8355671B2 US8355671B2 (en) 2013-01-15
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Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:JACOBSEN, JEFFREY J.;REEL/FRAME:027642/0275