Most Popular Articles
AM Operators Now Have IBOC Digital Options
AM station operators considering or currently on the air with AM IBOC digital signals now have a more analog-friendly signal option. Ibiquity's new modified MA1 specification, introduced by Jeff Detweiler at a radio technology engineering session at the 2010 NAB Show, allows broadcasters to sacrifice a degree of digital throughput in exchange for a somewhat higher analog bandwidth and a commensurate noise-floor reduction in analog receivers.
Specifically, the new specification allows for operation in a "core only" mode, eliminating the tertiary and secondary digital carriers that lie closer to the carrier with the analog sidebands. This permits the use of broader analog audio filtering by the broadcaster for improved analog quality and also reduces so-called "self interference" that manifests itself as a higher analog noise floor.
While IBOC audio data throughput using the modified scheme is reduced from 36kb/s to 20kb/s, improved low-bit-rate codecs employing spectral replication permit higher quality digital audio than was available using previous codec options.
Ibiquity hopes the new option may convince some AM broadcasters previously squeamish about sacrificing analog reception quality with their current audience to reconsider IBOC digital conversion.
Acceptable Use Policy blog comments powered by Disqus
[an error occurred while processing this directive]
Today in Radio History
The history of radio broadcasting extends beyond the work of a few famous inventors.
Read each issue online in our Digital Edition Format in your Web browser.
EAS Information More on EAS
The feed provides feeds for all US states and territories.
Need a calendar for your computer desktop? Use one of ours.
Information from manufacturers and associations about industry news, products, technology and business announcements.
Browse Back Issues[an error occurred while processing this directive]
Also in the March Issue
- The "And More" of Automation
- FCC Enforcement Items to Watch
- Testing AM Antennas
- New Products
- Field Report: Cloud Microphones Cloudlifter CL-1
- New Products at the 2014 NAB Show
- Side by Side: IP Codecs