HDRadio

This web page contains information that is relevant to the NRSC-5 IBOC Digital Radio Broadcasting Standard.  Consequently, this web page supplements the information available from the NRSC.

Specifically, the service parameters that are presented on this web page are included in iBiquity’s HD Radio system:

Audio Service Program Types, transmitted in the HD Radio system and defined by the NRSC-5 IBOC Standard, are based on the definitions provided by the IEC Standard (IEC 62106-9:2021).  Refer to the most up-to-date version of the IEC Standard for the current definitions.

Audio Service Program Types are specified to indicate categories that are available to classify, define, or label the audio services.  Program types zero to 31 mirror the existing definitions in the IEC Standard.  Program types 32 to 255 are HD Radio extensions that define additional music and program formats available to broadcasters.

NRSC Supplemental Information provides the most up-to-date information regarding the Audio Service Program Types that are available in the HD Radio system.  A receiver would display the text for the program type upon receiving the type number.

The Advanced Application Services (AAS) Transport requires the transmission of a port identifier for different data services.Whereas some data services have specific port assignments, common to all broadcast installations is the fact that most data services may be assigned to port numbers on a station-by-station basis.

Data services that have specific port assignments include:

• MPS PSD data is always assigned to port 0x5100
• SPS1 through SPS7 PSD data is always assigned to ports 0x5201 through 0x5207, respectively

Data services that have port assignments controlled by the station:

• A Traffic data application may be assigned to any port in the range of 0x401 to 0x50FF

The receiver can identify the data service assigned to a port via the application MIME hash.

*Note:  Any Port Number containing a byte value of 0x7D or 0x7E is invalid and shall not be used.  For example, port number 0x537D is invalid but 0x537F is OK

Various Applied Sound Experience Types are specified to indicate enhancements that have been applied to the audio signal at the transmit side of the HD Radio system.The applied sound experience identification is decoded by the HD Radio decoder IC and is available through the command protocol.  Receiver manufacturers should reference the command interface documentation for more details about accessing this information.

Various Text Encoding Types are specified to indicate standard character formats that may be used for messages that contain text strings.

   If a text field is received with the encoding type of “Reserved”, the receiver shall not display that text field.

Various Service Data Types are specified to indicate categories that are available to classify, define, or label data services.