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HD Radio Implementation by Thomas R. Ray

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CHAPTER

Audio Processing for HD Radio

4

4.1  What an audio codec is and how it works

In the previous chapters, we have stated that the digital audio on an HD Radio signal is data-reduced audio. Due to the constraints of the assigned channels on AM and FM stations, a non-data-reduced signal would be far too large to transmit. An audio codec is therefore used to remedy this situation.

An audio codec has two parts: an enCOder on the transmit side, and a DECoder on the receive side. These work in tandem to pass the audio from the transmitter through the RF channel and into the listener’s receiver.

Unfortunately, I cannot give details about how the HDC codec used in the iBiquity Digital HD Radio system actually works. This information is proprietary ...

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