Required bit rate of 22.2 multichannel audio signal compressed by MPEG-H 3D Audio to meet broadcast quality

Bit rate required for mono audio object in object-based audio program compressed with MPEG-H 3D Audio

“…As an example of a program, assume an OBA program composed of 22.2 ch background sound and four mono dialogues, e.g., Japanese, English, French, and the audio description. The previous study has demonstrated that the 22.2 ch sound program by channel-based audio meets the broadcast quality at 512 kbit/s in MPEG-H 3DA [22]; Br mca is set to 512 kbit/s for this example. Also, as mentioned above, the mono audio object of the dialogue meets the broadcast quality at 48 kbit/s; Br mono is set to 48 kbit/s.…”

“…where Br total is the total bit rate required for OBA program, Br mca is the bit rate required for the multichannel audio format of background sound, and Br mono is the bit rate required for mono audio object. Since Br mca in MPEG-H 3DA can been found from the previous studies [21][22][23], what to need to find is Br mono in MPEG-H 3DA. Someone might consider that Br mono can be estimated by dividing Br mca by M. However, it should be noted that MPEG-H 3DA technology dynamically allocates bit between channels and exploits inter-channel redundancies to enhance the coding efficiency [24].…”

“…Bit rate estimation is a critical factor for the design of the broadcasting system and transmission line. Several studies have reported on the relationship between audio quality and bit rate with regard to MPEG-H 3DA [21][22][23]. However, they targeted typical audio formats, e.g., 22.2 multichannel (22.2 ch) sound, 5.1 surround, and stereo; there has been no knowledge with respect to the bit rate required for the audio object in MPEG-H 3DA.…”