While finding that the ultimate compression system is probably impossible, many programmers have come up with fairly good approximations.

But any compression system has trouble competing with the sound quality of a CD.

The compression system is then said to be axial-centrifugal.

An audio compression system limited to two channels (stereo).

Rate-distortion theory tell us that no compression system exists that performs outside the gray area.

The closer a practical compression system is to the red (lower) bound, the better it performs.

Other compression systems are being designed for special applications such as videoconferencing schemes.

This is a trend confirmed by another popular site for music downloads, a2bmusic, which uses a more sophisticated digital compression system.

Increasing the overall pressure ratio of the compression system raises the combustor entry temperature.

The overall pressure ratio of the compression system is 24.3.