The technology behind HD Radio™

Basically, digital radio works the same as conventional radio. There’s a signal on one end and a receiver on the other. But there are a few key differences.





[1] Instead of sending out one analog signal, stations send out a bundled signal – both analog and digital. Because it is digital, textual data such as traffic, stock info and song titles can be sent out, as well.

[2] The digital signal layer is compressed, and the combined analog and digital signals are transmitted.

[3] The combined analog and digital signals are transmitted.

[4] Inevitably, radio signals bounce off objects, causing what is called multipath distortions. This is what causes the static in conventional radio receivers. HD Digital Radio™ receivers are designed to sort through reflected signals, reducing static, hiss, pops and fades.

[5] Finally, the signals reach their destination. Both broadcasts are free, with no subscription fee. To hear the digital broadcast, all you need is an HD Radio™ receiver.

Want to Know More?

Ever wonder how technology can split the radio signal into analog and digital channels and then transmit it over the existing AM/FM bands? It’s a process known as In-Band On-Channel (IBOC) Broadcasting. And the benefits are REVOLUTIONARY. Why? Because it’s DIGITAL and it’s FREE.

The Digital Revolution

HD Digital Radio™ supports CD-quality sound as well as song titles and artist names. And because the digital signal piggybacks onto a conventional broadcast signal, it is free to the listener.

The Power of Free

With HD Radio™, broadcasters can use the current radio spectrum to transmit free analog simultaneously with new higher quality digital signals. This eliminates the static, hiss, pops and fades associated with today’s radio caused by conditions known as multipath, noise and interference.

Transitioning Out of Analog

With IBOC-based HD Radio™ technology, radio receivers and other consumer electronics will receive traditional analog broadcasts from stations that have yet to convert and digital broadcasts from stations that have converted.
Current analog radios will continue to receive the analog portion of the IBOC-based broadcast, allowing for a smooth transition to a digital world. In fact, specific features have been designed into HD Radio™-supported receivers to improve the existing analog reception during the "Hybrid Mode."
As the market reaches maturity, broadcasters will transition out of analog broadcasts and offer "all-digital mode". As a result of our digital architecture, enhanced services such as increased data capacity, surround sound or other multicasting solutions can be made available across this unused bandwidth.