Article | REF: TE6142 V1

Digital radio - Source coding, formatting, data protection

Authors: Jean-Noël GOUYET, Sylvie KALINOWSKI

Publication date: August 10, 2013

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ABSTRACT

This article presents the prospects for an exclusively digital radio. It describes the technical functions which allowed for the development of digital radio systems: source coding with the MUSICAM audio codec and then the highly efficient MPEG-4 HE-AAC; frame formatting with component and service multiplexing; data protection with error-detection and correction codes associated to interleaving.

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AUTHORS

  • Jean-Noël GOUYET: Training engineer and consultant in digital radio, television and multimedia techniques and systems - Former head of research at INA (Institut national de l'audiovisuel)

  • Sylvie KALINOWSKI: Head of the Transmission – Diffusion training program at INA Expert

 INTRODUCTION

At a time when digital is supplanting analog in all image and sound transfer techniques, the sound broadcasting sector is a rather special case, insofar as the two modes seem to have found a state of equilibrium in cohabitation. Having taken the gamble that analog cannot endure in the face of the inescapable thrust of digital, the authors propose to open a dossier highlighting the relative prospects for the evolution of an exclusively digital radio.

This dossier, concerning only the last segment of a radio production/distribution chain, which goes from a point of transmission to the receiving terminal, is made up of 4 articles:

  • [TE 6 140] , after a brief history of radio, reviews the technical platforms and networks that can be used for analog and then digital radio. It then presents a brief overview of the technical systems developed for broadcasting or transmitting digital radio, and compares their different uses depending on the distribution platform;

  • This article [TE 6 142] covers the main techniques common to the various digital radio systems: audio source coding (in particular MPEG-4 HE-AAC), frame formatting and multiplexing, and data protection through error detection-correction and interleaving. OFDM digital modulation is presented in the associated article [TE 6 143] ;

  • [TE 6 150] details the first broadcast standard developed, DAB (Digital Audio Broadcasting) and its 2nd generation, DAB+, as well as T-DMB (Terrestrial – Digital Multimedia Broadcasting), derived from DAB, but extended to broadcast video to mobiles;

  • [TE 6 154] exposes other digital radio broadcasting systems...

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KEYWORDS

audio codec   |   source coding   |   audiovisual & multimedia   |   broadcasting   |   multimedia   |   multiplexing   |   data protection


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