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Animated "on-screen" display provisions for an MPEG video signal processing system
| Details |
Inventors: Horton, Raymond Scott;
Assignee: Thomson Consumer Electronics, Inc., (Indianapolis, IN)
Primary Examiner: Faile; Andrew I.
Assistant Examiner: Le; Uyen
Attorney, Agent or Firm: Tripoli; Joseph S., Emanuel; Peter M.
A digital television system which processes television information in the form of a stream data packets representing video and audio information in compressed form, such as MPEG, includes on-screen display (OSD) provisions for displaying sophisticated graphics, such as animation, by storing graphics data in a read only memory (ROM) in the same compressed form as that used for the video information. The graphics data is transported to the same video decoding and decompression unit which processes the video data contained in the video packets to form digital signals representing video information in uncompressed form, where it is converted in the same manner as the video data to form graphic image data. A multiplexing arrangement is provided so that digital signals representing animation graphics can be multiplexed with digital signals representing static graphics image data derived from bit-mapped representations. |
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DETAILED DESCRIPTION OF THE DRAWING The invention will be described with reference to a digital satellite television system in which television information is compressed and encoded in accordance with what has become known as the MPEG protocol or standard.
MPEG is an international standard for the coded representation of moving pictures and associated audio information developed by the Motion Pictures Expert Group.
More specifically, prior to transmission, analog video and audio signals are converted to respective digital signals.
The digital video and audio signals are compressed to remove redundant information in order to reduce the transmission bandwidth and the resultant digital signals are formatted into a stream of audio and video packets.
Each packet includes a "payload" portion including either video or audio data and a packet "header" code which identifies the type of information represented by the payload portion of the packet.
Packets corresponding to control and other data are also added the packet stream.
Forward error correction (FEC) data is added to the packets in order make the correction of errors due to noise within the transmission path possible.
The well known Viterbi and Reed-Solomon types of forward error correction coding may both be advantageously employed.
The digital data resulting from the compression, formatting and error correction operations is modulated onto a carrier in what is known in the digital transmission field as QPSK (Quaternary Phase Shift Keying) modulation.
In the digital satellite television system shown in FIG.
1, a transmitter 1, with an associated transmitting antenna 3, transmits the compressed and digitally encoded television signals to a satellite 5 in geosynchronous earth orbit.
Satellite 5 receives the transmitted television signals and retransmits them to the earth.
The retransmitted television signals are received by an antenna assembly or "outdoor unit" 7.
Antenna assembly 7 includes a dish-like antenna 9 and a frequency converter 11
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