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Digital Radio Is Coming, Pt.2

Digital Radio broadcasts will use Advanced Audio Coding (AAC+) of the digital audio signals. AAC+ is a complex compression process which greatly reduces the amount of RF bandwidth and transmission power necessary to broadcast a high quality signal.

by Alan Hughes

When we introduced Digital Radio last month, we explained how this completely new technology will commence in Australia in just a few weeks.

The panel below summarises what is required to broadcast high quality audio signals. Analog hifi systems and uncompressed digital systems (eg, compact disc) aim to produce a close replica of the original sound but this uses wide bandwidth and can require high transmission power.

The AAC+ compression process aims to transmit what your ears and brain perceive but employs much reduced bandwidth and transmission power.

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