COFDM combined encoder modulation for digital broadcasting sound and video with PSK, PSK/AM, and QAM techniques
Patent 5521943 Issued on May 28, 1996. Estimated Expiration Date: 
September 17, 2013. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
September 17, 2013. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesReceiver for PSK digital signals Digital audio broadcasting system Method and system for transmitting digital audio signals from recording studios to the various master stations of a broadcasting network Method of transmitting digital HDTV signals Patent #: 5430492 InventorApplicationNo. 122360 filed on 09/17/1993US Classes:375/295, TRANSMITTERS348/724, Modulator370/206, Quadrature carriers375/285, Antinoise or distortion375/296, Antinoise or distortion (includes predistortion)375/308, Phase shift keying455/103Plural separate transmitters or channelsExaminersPrimary: Tse, Young T.Assistant: Luther, William Attorney, Agent or FirmInternational ClassesH04L 027/04H04L 027/12 H04L 027/20 Foreign Application Priority Data1992-09-21 DEAbstractIn a digital broadcasting transmitter network system operating on a DAB principle, in which: digital programs to be broadcast via individual transmitting stations after corresponding data reduction are coded and modulated in accordance with COFDM technique; data of digital sound and/or video programs is packed into a plurality of COFDM signal packets and transmitted via a transmitting station; and/or two or three 4 PSK-COFDM coders having their outputs combined via an adder stage are used for producing individual COFDM signal packets so that the data quantity to be transmitted can be increased. Feeding of increased data quantity may take place via digital satellite channels under a DSR principle at higher-order modulation.Other References
Field of SearchPlural channels for transmission of a single pulse trainDifferential phase shift keying (diphase) SYSTEMS USING ALTERNATING OR PULSATING CURRENT TRANSMITTERS Antinoise or distortion (includes predistortion) Quadrature amplitude modulation Plural diversity Frequency shift keying Manchester code or biphase code Frequency shift keying Diversity More than two frequencies Modulator | |
