AC-1


Also found in: Acronyms.

AC-1

(Active Coding-1) Dolby's first digital audio coding technology based on adaptive delta modulation (ADM). First used in 1984, AC-1 has been deployed in satellite and cable systems. See AC-2 and AC-3.
References in periodicals archive ?
In addition, the AC-1 patients reported sleeping significantly fewer hours (6.3 hours versus 7.6 hours) and taking significantly longer to fall asleep (61.4 minutes versus 18.6 minutes), compared with controls.
Data from 16 consecutive patients with AC-1 malformations showed a significant improvement in the central apnea index from 14.9 to 1.3 based on full-night polysomnography conducted approximately 200 days after decompression surgery (Neurology 2006;66:136-8).
Future studies of AC-1 patients need to continue to focus on objective measures and comparison of patients before and after they have decompressive surgery, Dr.