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T13 - AUDIO QUALITY IN NEW LOW BIT-RATE DISTRIBUTION SYSTEMS
Lars Jonsson, EBU/Swedish Radio
Gregory Massey, APT Ltd. - Ireland
Gerhard Stoll, IRT - Munich, Germany
Audio quality in new low bit-rate distribution systems—with a broadcasters cascade perspective with many re-encodings at too low bit rates. What is the solution to this problem?
In all new digital distribution systems broadcasters are faced with the problem of using perceptual coding systems in all stages of the broadcasting chain, from early capturing to contribution over editing and on-air. Systems in the home are now also using recording with digital media with low bit rate systems. The resulting overall quality is often degraded by the cascading artifacts in more than five steps of coding and re-encoding.
This tutorial discusses state of the art methods and listening test results within the EBU to overcome these problems.