ATSC Standards Update: A/300 Revision Approved

Posted on August 21, 2025 in ATSC News

Since the last issue of The Standard newsletter, the annual update of A/300, “ATSC 3.0 System,” was approved by the membership. In addition to the annual reference updates, the new version of A/300 includes a new Annex B on “ATSC 3.0 Operating Configurations.” A key element of the annual A/300 revision is direction to staff to update references and schemas in and to all ATSC 3.0 Standards and Recommended Practices. This results in updates to all 23 Standards and 10 Recommended Practices in the ATSC 3.0 suite. Work is underway now on the new documents, which will be published on the same day, likely within the next week or so.

In addition to A/300, A/322:2024-09 Amendment No. 1, “ATSC 3.0 Errata,” has been approved by the membership. This amendment mainly corrects errata items found in the MIMO, Channel Bonding, and LDM combinations in the physical layer. It also fixes errata items for Subframe and Frame term additions, and LDM Core layer <= Enhanced Layer SNR description. The amendment has been published on the ATSC web site. A rollup of the amendment into the A/322 Standard is pending.

At this writing, four ballots were underway:

• S33-784r11, “ATSC Proposed Standard: A/331:2025-06 Amendment No. 1, Time,” is at ballot of the full membership. The ballot closes on 10 September 2025.
• S33-792r4, “Working Draft Amendment No. 1 to ATSC Standard A/337:2024-04, Application Event Delivery,” is at TG3 ballot. The ballot closes on 8 September 2025.
• S33-805r0, “Working Draft Amendment No. 1 to ATSC Standard A/339:2024-04, Audio Watermark Modification and Erasure,” is at TG3 ballot. The ballot closes on 9 September 2025.
• S33-807r6, “Working Draft: Amendment No. 3 to ATSC Standard A/331:2025-06, Signaling, Delivery, Synchronization, and Error Protection,” is at TG3 ballot. The ballot closes on 15 September 2025.

Additional TG3 ballots are expected in the coming days.

Posted in ATSC News