HD Radio (FM)

HD Radio (FM)

Frequencies	87.7 MHz,107.9 MHz
Frequency Range	87.7 MHz - 107.9 MHz
Mode	RAW
Modulation	OFDM
ACF	—
Emission Designator	—
Bandwidth	400 kHz
Location	United States
Short Description	HD Radio is a proprietary digital broadcast radio format transmitted in North America, usually as sidebands on analog carriers. This is the FM band implementation of HD Radio.
I/Q Raw Recording	—
Audio Sample

HD Radio (AM) | HD Radio (FMFrequency Modulation)

iBiquity HD Radio is a proprietary digital broadcast radio format transmitted in North America, usually as sidebands on analog carriers. This is the FMFrequency Modulation band implementation of HD Radio. This system exists on both FM and AM Bands. This system was developed by iBiquity, which has been acquired by DTS in 2016.

Characteristics

HD Radio is an OFDMOrthogonal Frequency-Division Multiplexing digital broadcast that usually coincides with an analog signal, but in the AMAmplitude Modulation band you may find signals that are purely HD Radio format, in a similar fashion as DRM. HD radio can also have multiple soundtracks, adding to the number of radio stations you can listen to on a given frequency channel.

Currently, hybrid implementations employ IBOCIn-Band On-Channel (IBOC) is a hybrid method of transmitting digital radio and analog radio broadcast signals simultaneously on the same frequency. techniques by adding extended subcarriers to existing analog transmissions so that both analog and digital formats can be supported. In the future it is hoped that this will allow a gradual segue into fully-digital radio broadcasts.

For FMFrequency Modulation IBOCIn-Band On-Channel (IBOC) is a hybrid method of transmitting digital radio and analog radio broadcast signals simultaneously on the same frequency., each HD Radio sideband is 85 kHzKiloHertz (kHz) 10^3 Hz wide.

Samples

The sound sample is the first 16 kHzKiloHertz (kHz) 10^3 Hz of the signal right of the analog fm broadcast, received using USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) mode.

IQQuadrature signals form the basis of complex RF signal modulation and demodulation, both in hardware and in software, as well as in complex signal analysis. files

HD radio IQ file

Frequencies

US FMFrequency Modulation Broadcast Band (87 MHzMegaHertz (MHz) 10^6 Hz - 108 MHzMegaHertz (MHz) 10^6 Hz)

HD Radio is also used in Canada and Mexico.

Decoding Software

• NRSC-5 commandline receiver for RTL-SDR
• NRSC-5 DUI, based on NRSC-5 GUI which is not dependant on python audio processing, includes Album Art. Not easily supported on Windows
• NRSC5 GUI which uses python audio processing. Has not been updated since 2020. Supported on Linux/Mac/Windows

Video Examples

• SDR- HD Radio and analog radio on 98 mhz

Additional Links

• HD Radio Air Interface Design Description: Layer 1 FM
• Wikipedia HD Radio
• IBOC FM methods
• iBiquity (Now owned by DTS)
• HD Radio Official Website
• HD Radio Tutorial

Additional Images

Cropped image of a single HD Radio sideband An Analog FMFrequency Modulation Transmission flanked with two sidebands transmitting HD Radio digital broadcast of the same radio station, as well as a secondary radio station (with is only accessible by an HD radio), which in this case plays jazz music HD radio spectrum and waterfall HD Radio on 107.9 MHzMegaHertz (MHz) 10^6 Hz, showing the two sidebands. HD Radio on 107.3 MHzMegaHertz (MHz) 10^6 Hz. We see the total bandwidth is 400 kHzKiloHertz (kHz) 10^3 Hz with the HD Radio OFDMOrthogonal Frequency-Division Multiplexing sidebands. Spectrum of HD Radio on FMFrequency Modulation HD Radio on 100.3 MHzMegaHertz (MHz) 10^6 Hz. HD radio sidebands on 101.5 MHzMegaHertz (MHz) 10^6 Hz FMFrequency Modulation Radio Station.