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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