Digital audio satellite transmission system
Patent 4567591 Issued on January 28, 1986. Estimated Expiration Date: 
August 1, 2003. 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.
August 1, 2003. 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 ReferencesIntegrated encryption and channel coding technique Error correction system for differential phase-shift-keying Patent #: 4211996 InventorsApplicationNo. 06/519268 filed on 08/01/1983US Classes:370/326, Combining or distributing information via time channels370/521, Time compression or expansion370/535, Multiplexing combined with demultiplexing714/786Forward error correction by tree code (e.g., convolutional)ExaminersPrimary: Olms, Douglas W.Assistant: Scutch, III, Frank M. Attorney, Agent or FirmInternational ClassesH04H 1/00 (20060101)H03M 13/00 (20060101) H03M 13/05 (20060101) H04B 7/185 (20060101) AbstractA digital audio satellite transmission system involving analog-to-digital conversion of audio signals, processing of such signals and transmission to and reception from a satellite transponder link. The digitized audio signal is digitally compressed to reduce the data rate. Several such signals are then time division multiplexed together. Differential encoding, bit interleaving and forward error correction coding is utilized to maintain high signal quality, together with binary phase shift key carrier modulation. Matched filter reception of the BPSK signal transmitted over a conventional satellite transponder link is provided together with BPSK demodulation, TDM demultiplexing, differential decoding, bit deinterleaving and threshold FEC decoding. The compressed digital signal is then expanded and converted to an analog audio signal.Other References
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