Apparatus and method for using forward error correction setting to enable simultaneous use of multiple modulation systems on terrestrial distribution networks
Patent 6011950 Issued on January 4, 2000. Estimated Expiration Date: 
February 18, 2019. 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.
February 18, 2019. 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 ReferencesStochastic time division multiplexing Simulcast transmission of digital programs to shared antenna receiving systems Patent #: 5666365 InventorApplicationNo. 252340 filed on 02/18/1999US Classes:725/67, Transmitter370/535, Multiplexing combined with demultiplexing455/12.1, Space satellite725/63SATELLITE VIDEO DISTRIBUTION SYSTEMExaminersPrimary: Pham, ChiAssistant: Tran, Mai-Huong Attorney, Agent or FirmInternational ClassesH04J 003/22H04N 007/10 AbstractAn apparatus and method using the forward error correction setting to enable simultaneous use of multiple modulation systems on terrestrial distribution networks including cable television systems is described. The system includes a transcoder having a demultiplexer for demultiplexing a forward-error-correction decoded signal into a main data stream with a bit rate suitable for 64-QAM cable transmission and an auxiliary data stream with a bit rate approximately half that of the main data stream. Two of such auxiliary data streams can be combined to generate an output data stream with a bit rate suitable for 64-QAM cable transmission. The system also includes a satellite transmitter which can adjust its convolution coding rate to either 1/2 or 3/4 for 64-QAM and 256-QAM cable channels respectively.Other References
Field of SearchSpace satelliteSpace satellite Multiplexing combined with demultiplexing Demultiplexing single signal into plural parallel channels (e.g., parallel transmission for increasing transmission speed) Multiplexing plural input channels to a common output channel Plural input channels of different rates to a single common rate output channel Demultiplexing single input channel to plural output channels Different rate output channels Conversion of rate from a single input to a single output Plural input channels of same rate to a single common rate output channel Airborne or space satellite repeater Including onboard switching | |
