Digital Audio PCMIn parallel to the captured video stream, digital audio originated of the same source may be capturedthrough the video bus of VIP. Multiple stereo channels could be supported. A stereo channel with, e.g.,2 * 16 bits PCM, sampled with 48 kHz, produces about 12 bytes per video line. This amount of data istreated as ancillary data, and fits easily into horizontal blanking interval of the video stream.The description in this section is preliminary. It is based on, and represents a subset of, a draft of the ITUtask group 11/2 under progress. It may need to be revised after that ITU draft gets final status.Up to 4 digital audio PCM channels, i.e. two stereo pairs, are bundled into a group. Each group isrepresented by a specific ANC-DID code. Up to 4 groups, i.e. up to 16 channels can be encoded asancillary data into the horizontal blanking intervals of the video stream.The transmission of the audio samples is spread over the video field, depending on their sample rate, toachieve near equal ANC data load for all line blanking periods. The collected samples per line form anAudio Data Packet. The packets of each group are transported by means of a specific ANC-DID code. AnAudio Data Packet can be appended by an Extended Data Packet, carrying specific control data.Four ANC-DID codes are reserved for the four Audio groups:BF h, 7F h, 7E h and BE h.https://en.wikipedia.org/wiki/Feature_connector