IVAS - Technical Details

3GPP Standards and Technical Specifications

IVAS the new 3GPP codec based on the following specifications:

3GPP TS/TR	Title	Status
26.250	General overview	Available in Rel-18
26.251	C code (fixed-point)	In progress (sched. Rel-19)
26.252	Test sequences	Available in Rel-18
26.253	Detailed algorithmic description incl. RTP payload format and SDP parameter definitions	Available in Rel-18
26.254	Codec for Immersive Voice and Audio Services - Rendering	Available in Rel-18
26.255	Error concealment of lost packets	Available in Rel-18
26.256	Jitter Buffer Management	Available in Rel-18
26.258	Codec for Immersive Voice and Audio Services; C code (floating-point)	Available in Rel-18
26.997 (TR)	IVAS codec performance characterization	Available in Rel-18 (will be updated with characterization test results)

IVAS supports the following formats and bitrates:

IVAS audio formats	Supported bitrates (kbps)
Mono (100% EVS compatible/interoperable mode)	5.9 - 128
Stereo/binaural	13.2 - 256
SBA (Ambisonics, order 1 to 3)	13.2 - 512
MASA (Metadata-assisted spatial audio)	13.2 - 512
Multichannel (5.1 to 7.1.4, flexible layouts)	13.2 - 512
ISM (Object Audio, 1-4 objects)	13.2 - 512

IVAS is a communication codec that exhibits the below algorithmic latency:

End-to-end audio latency [ms]

32

33/38¹

32/37¹

¹Depending on output format