Computer graphics processing and selective visual display system – Display driving control circuitry – Controlling the condition of display elements
Patent
1996-04-04
1998-05-05
Ghebretinsae, T.
Computer graphics processing and selective visual display system
Display driving control circuitry
Controlling the condition of display elements
375368, 370515, H04L 700
Patent
active
057486867
ABSTRACT:
In a digital audio broadcasting (DAB) system having a radio-frequency (RF) transmitter and a corresponding RF receiver, a system and method for providing improved frame synchronization is provided. In accordance with the preferred embodiment, the RF transmitter formats a DAB signal into a sequence of frames, each frame having a header with a predefined grouping of psuedo-random number sequences comprising 100 symbols. Of these 100 symbols, 86 symbols of the header preferable are used for frame synchronization and characterization of a communications channel, while the remaining 14 symbols are used for interleaver and data synchronization in an interleaved fashion. The formatted DAB signal, including the frame sequences, is transmitted to the receiver preferably using quadrature phase-shift keying modulation. At the receiver, a correlator, utilizing a synchronization detection algorithm, is generally designed to match a predetermined symbol pattern within the received signal. Once the frame synchronization is established, the channel is characterized and the data symbols are recovered.
REFERENCES:
patent: 4849995 (1989-07-01), Takeo et al.
patent: 5228036 (1993-07-01), Okamoto et al.
patent: 5260972 (1993-11-01), Wang
patent: 5367544 (1994-11-01), Bruekheimer
patent: 5406586 (1995-04-01), Wang
patent: 5528635 (1996-06-01), Negi
patent: 5627863 (1997-05-01), Aslanis et al.
World Media Expo News, "AT&T System Broadcasts Live", by Alan Carter, Sep. 7, 1995.
World Media Expo News, "Reaction in on AT&T DAB Demo", by Alan Carter, Sep. 8, 1995.
Langberg Ehud
Wang Jin-Der
Ghebretinsae T.
Globespan Technologies, Inc.
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