Overview
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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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Read the articleAUTHORS
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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)
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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:
, 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;[TE 6 140] 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] 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 6 150] -
exposes other digital radio broadcasting systems...[TE 6 154]
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KEYWORDS
audio codec | source coding | audiovisual & multimedia | broadcasting | multimedia | multiplexing | data protection
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Signal processing and its applications
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Digital radio
Bibliography
Standards and norms
Source coding
- Information technology – Coding of moving pictures and associated audio for digital storage media at up to about 1,5 Mbit/s – Part 3: Audio http://www.iso.org/iso/iso_catalogue/catalogue_tc/catalogue_detail.htm?csnumber=22412 - ISO/IEC 11172-3 - 1993
- Information technology – Generic coding of moving pictures and associated audio information – Part 3: Audio http://www.iso.org/iso/iso_catalogue/catalogue_ics/catalogue_detail_ics.htm?csnumber=22991...
Directories
• EBU (European Broadcasting Union) http://www.ebu.ch
• ETSI (European Telecommunications Standards Institute) http://www.etsi.org
• IEC (International Electrotechnical Commission) http://www.iec.ch
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