Patent Publication Number: US-2006015929-A1

Title: USB interface module for TV broadcasting

Description:
FIELD OF THE INVENTION  
      The present invention relates generally to TV broadcasting, e.g., digital video broadcasting (DVB), and particularly to a USB interface module for TV broadcasting with a PC.  
     BACKGROUND OF THE INVENTION  
      Digital video broadcasting (DVB) signals include the video and audio components of broadcast content, as well as other information. For example, a receiver of a digital transmission needs control data for its technical function, such as so-called “Packet_Identifiers” (PID) among others, so that when the Packaged Elementary Streams (PES) are demultiplexed from the received transportation stream, the compressed video or audio data contained therein can be functionally assigned. These control data are transmitted as “sections” in the so-called Program Specific Information (PSI), which may be expanded in accordance with the service provider&#39;s needs by means of additional sections, so-called “Private-Sections”.  
      Modules exist in the prior art for receiving DVB signals, processing the audio and video content and transmitting the processed and decoded signals for viewing and listening on a personal computer (PC). These modules connect to the PC via a USB (universal serial bus) connector that plugs into the USB port of the PC. Prior art USB devices for DVB perform transport stream processing and transfer selected PIDs or data only to the host PC.  
     SUMMARY OF THE INVENTION  
      The present invention seeks to provide a novel and improved a USB interface module for DVB with a PC, as is described more in detail hereinbelow.  
      Throughout the specification and claims, the term “TV broadcast” or “TV broadcasting” is used as the generic term to refer to currently existing TV systems, their transport protocols, and their typical operation of content provision and distribution, such as but not limited to, DVB, ATSC, DSS, NTSC, and PAL. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS  
      The present invention will be understood and appreciated more fully from the following detailed description taken in conjunction with the single drawing, which is a simplified block diagram illustration of a USB interface module for receiving a TV broadcast for playing on a PC, in accordance with an embodiment of the present invention. 
    
    
     DETAILED DESCRIPTION OF EMBODIMENTS  
      Reference is now made to the single drawing, which illustrates a USB interface module for receiving a TV broadcast for playing on a PC, in accordance with an embodiment of the present invention.  
      The module may include a Network Interface Module (NIM) integrated circuit component, such as but not limited to, a QPSK demodulation chip. The NIM may be in communication with a first controller through a control bus. The data received by the NIM may include, without limitation, a TV broadcast transport stream (e.g., DVB-compliant transport stream) that may be carried over satellite, cable, or terrestrial digital transmission systems or any other suitable communication system. The full transport stream may be received by the NIM and passed on to the PC via a USB2.0 interface controller, as controlled by the first controller.  
      It is important to note that the USB interface module of the present invention transfers the transport stream without any handling thereof (i.e., unprocessed) to the PC through the USB2.0 interface. Then the host PC software provides the transport stream handling, including without limitation, parsing, demultiplexing, PID (packet identifier) filtering, decoding, retransmitting to the LAN (local area network) and others. The data that may be extracted from the TV broadcast may comprise, without limitation, IP (Internet protocol) data over DVB, such as but not limited to, bit-streams, byte-streams, headers of SI, MPEG files and packets, e-mail and many others.  
      Examples of PC software which may fully handle the transport stream include:  
      a. Microsoft Windows XP Media Center Edition (MCE), which includes tools for digital media, including Windows Media® Player 9 Series (for DVD playback, CD burning, exporting video to portable devices), Windows Movie Maker 2 (for capturing, editing, showing, and organizing movies)  
      b. Homemedianetworks software called the ShowShifter, including PC TV record and playback, browsing of TV listings and setting timed recordings, entertainment over a network, and digital photos for view on a PC monitor.  
      In the prior art, the USB module did the transport stream handling. A reason for this perhaps was the USB1.1 bandwidth limitation—12 Mbits per second, which could not handle the required bandwidth for full transport stream, whose bandwidth may be up to 120 Mbits per second. However, the present invention uses a USB2.0 interface, whose bandwidth may be up to 400 Mbits per second, thereby enabling passing on the full transport stream without any handling thereof to the PC.  
      Optionally, the first controller may provide processing of conditional access data or metadata which may be part of the TV broadcast data received by the module.  
      It will be appreciated by persons skilled in the art that the present invention is not limited by what has been particularly shown and described hereinabove. Rather the scope of the present invention includes both combinations and subcombinations of the features described hereinabove as well as modifications and variations thereof which would occur to a person of skill in the art upon reading the foregoing description and which are not in the prior art.