HD Radio
HD Radio system is the most successful digital radio platform with excellent audio quality and diverse features.
Most successful Digital Radio System
HD Radio OVERVIEW
How It Works
1. Stations bundle analog and digital audio signals (with textual data, such as artist and song information, weather and traffic, and more).
2. The digital signal layer is compressed using iBiquity’s HDC compression technology.
3. The combined analog and digital signals are transmitted.
4. The most common form of interference, multipath distortion, occurs when part of a signal bounces off an object and arrives at the receiver at a different time than the main signal. HD Radio receivers are designed to sort through the reflected signals and reduce static, hiss, pops and fades.
5. The signal will be compatible with HD Radio receivers and analog radios.
To provide innovative technology solutions for the communication and Broadcast industry.
More Information
HD Radio™ technology is a digital radio standard developed by iBiquity Digital and recognized by the U.S.
Federal Communications Commission (FCC). It works the same way that traditional analog transmits, except that the audio is digital formatted and transmitted as a continuous digital data stream in addition to the analog waveform signal.
On the broadcast end, audio is digitally compressed and broadcast by a transmitter designed specifically for HD Radio broadcasting. Audio is also transmitted in its analog form, as usual. The radio station sends out the analog and digital signals on the same broadcast frequency, along with the signals for the text data.
On the listener end, the signals are received and decoded. An HD Radio tuner picks up the digital radio transmission with its accompanying text. Older analog receivers continue to pick up the analog broadcasters.
Listeners can continue to enjoy their favorite stations on today’s analog receivers as well as on the new digital HD Radio receivers.
Digital System comparison
Comparison
A fundamental difference between DRM-30 and the HD Radio AM system is arrangement of the digital OFDM carriers. In DRM, all digital carriers are placed either above or below the AM analogue centre frequency (but not both). In the HD Radio system, the carriers are above, below and beneath the analogue carrier. A rough analogy is professional balanced audio versus consumer unbalanced audio. This concept makes the AM HD Radio system more robust and allows for greater forward error correction. It also allows for a maximum of 36 kB/second along with the AM analogue audio.
For best HD Radio performance, something called Hermetian Symmetry is desired. This is the tuning of the AM antenna system such that the bandwidth is essentially flat (impedance and reactance) over about 15 kHz above and below the assigned frequency. It should also be pointed out when such bandwidth is achieved by proper antenna tuning, the analogue will modulate more densely (enhance loudness and coverage) and have lower audio distortion.
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In the press
