ADX-3981: 8 AES Audio and Metadata De-Embedder Datasheet (DS-PUB-2-0342A-EN) File size: 670.7 KB, posted Feb 12 2020 The ADX-3981 from Grass Valley is an advanced, high quality audio processor which de-embeds up to eight AES signals at 48 kHz from a 3G/HD/SD video signal.