21. The closer a practical compression system is to the red ( lower ) bound, the better it performs. 22. Consequently, bleed air extracted from the compression system is often used to cool the turbine blades / vanes internally. 23. The venerable music compression system faces stiff competition from Microsoft Corp ., and is responding with a major update. 24. American engineer Alexander Twining took out a British patent in 1850 for a vapour compression system that used ether. 25. The compression system used now for television broadcast will not work with home computers or high-definition video cassette recorders. 26. Relatively cool air is bled from the compression system , bypassing the combustion process, and enters the hollow blade or vane. 27. These are logarithmic compression systems where a 12 or 13-bit linear PCM sample number is mapped into an 8-bit value. 28. There are two main types of refrigeration system used in cold storage warehouses, a Vapour compression system ( VCS ). 29. Dugald Clerk is the creator of the first commercial engine operating on the Barnett the modern compression system . ". 30. A major improvement in performance of chirp pulse generation and compression systems was achieved with the development of SAW filters.