Direct magnetic recording of audio results in the most efficient use of the recording-channel capacity from an information theoretic point of view - far more efficient than has been achieved by digital, video, or telemetry recorders. The limitations of baseband recording, however, have dictated a move to digital recording to remove the problems of nonlinearity, phase distortion, multiple generation noise, and so on. Unfortunately digital recording currently results in a large increase in the amount of tape needed relative to baseband recording. However, recent developments in the magnetic recording art will improve that situation and, in fact, will actually require less area of tape per second than baseband recorders.: Perpendicular recording and vector field recording (with isotropic particles and microgap heads) have permitted very large increases in lineal density and signal-to-noise ratio. By narrowing the tracks of such systems to spend some of the surplus signal-to-noise ratio, densities comparable to those of optical recorders are projected. An FM audio system utilizing isotropic recording at normal cassette speed is described. The advent of high bit densities at low cost makes very simple and effective error-correcting codes attractive.
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