Specification
3GPP TS 26.401: General audio codec audio processing functions; Enhanced aacPlus general audio codec; General description
At a glance
- Title
- General audio codec audio processing functions; Enhanced aacPlus general audio codec; General description
- Newest version
- V19.0.0 (Rel-19)
- Versions indexed
- 5
- Newest per release
- Rel-15: V15.0.0 (2018-06-22); Rel-16: V16.0.0 (2020-07-21); Rel-17: V17.0.0 (2022-04-07); Rel-18: V18.0.0 (2024-05-06); Rel-19: V19.0.0 (2025-10-31)
In plain words
TS 26.401 describes the "detailed mapping from" from an MPEG-4 bitstream containing Enhanced aacPlus coded audio to PCM sample output. The codec includes error concealment, spline resampler, and stereo-to-mono downmix as further tools. Section 5 gives a general overview of the parts in the Enhanced aacPlus codec and specifies which parts of the cited ISO standards apply.
Source: 3GPP TS 26.401 V19.0.0, clause 1. © 3GPP Organizational Partners (ARIB, ATIS, CCSA, ETSI, TSDSI, TTA, TTC). Official text: https://www.3gpp.org/ftp/Specs/archive/26_series/26.401/26401-j00.zip
Newest version in each release
| Release | Newest version | In the archive | TSG meeting |
|---|---|---|---|
| Rel-19 | V19.0.0 | 2025-10-31 | TSG SA #109 |
| Rel-18 | V18.0.0 | 2024-05-06 | TSG SA #103 |
| Rel-17 | V17.0.0 | 2022-04-07 | not recorded |
| Rel-16 | V16.0.0 | 2020-07-21 | not recorded |
| Rel-15 | V15.0.0 | 2018-06-22 | not recorded |
Source: 3GPP specification archive, versions indexed by 3GPP Scout. Each version links its official file.
Meetings behind the latest versions
Plenary meetings:
- TSG SA #109 is recorded for V19.0.0 (Rel-19)
- TSG SA #103 is recorded for V18.0.0 (Rel-18)
Source: 3GPP CR database and specification archive, as indexed by 3GPP Scout.
Sources
- 3GPP TS 26.401 V19.0.0, clause 1. © 3GPP Organizational Partners (ARIB, ATIS, CCSA, ETSI, TSDSI, TTA, TTC). Official text: https://www.3gpp.org/ftp/Specs/archive/26_series/26.401/26401-j00.zip
- 3GPP TS 26.401 V19.0.0, clause 4. © 3GPP Organizational Partners (ARIB, ATIS, CCSA, ETSI, TSDSI, TTA, TTC). Official text: https://www.3gpp.org/ftp/Specs/archive/26_series/26.401/26401-j00.zip
How this page was made
The facts box and the tables come straight from the 3GPP specification archive and CR database as indexed by 3GPP Scout. An AI model (GPT-6 Luna) wrote the paragraph and named the source of each sentence. Code checked every quote word for word against the stored source text and every number against the cited source. A second AI model from another company (Claude Opus 5.5) reviewed the paragraph against the same sources. The 3GPP documents themselves govern.