Many ITU-T Recommendations include test signals designed to evaluate the end-to-end quality of telecommunications systems and ensure conformity with specific Recommendation provisions. These test signals encompass various media types, including audio, still images, and moving images. The ITU-T test signals collection, exceeding 30 GB, serves as a global benchmark for assessing different components of telecommunications systems.Show more
To streamline their usage, ITU-T test signals for audio, images, and video to ensure quality and conformity in telecommunications systems have been consolidated into a single database, which are available for various ITU-T Recommendations.
Below one may find the list of ITU-T Recommendations that contain freely available test signals for download. Each link below opens a webpage with a short description of the relevant content and a link to download the relevant test signals.
The signals available here constitute part of the corresponding ITU-T Recommendations and are protected by copyrights laws.
You may use them during product or service development for the purpose of implementing the corresponding ITU-T Recommendations.
| Type Signal | Type Rec. Signal | Recommendation | Title |
|---|---|---|---|
| General | ITU-T P.50 | Artificial voices | |
| General | ITU-T P.381 | Technical requirements and test methods for analogue wired headsets or headphones and corresponding universal interface of terminals | |
| General | ITU-T P.501 | Test signals for use in telephony and other speech-based applications | |
| General | ITU-T P.561 | In-service non-intrusive measurement device – Voice service measurements | |
| General | ITU-T P.564 | Conformance testing for voice over IP transmission quality assessment models | |
| General | ITU-T P.834.1 | Extension of the methodology for the derivation of equipment impairment factors from instrumental models for wideband speech codecs | |
| General | ITU-T P.834.2 | Extension of the methodology for the derivation of equipment impairment factors from instrumental models for fullband speech codecs | |
| General | ITU-T P.863.2 | Extension of ITU-T P.863 for multidimensional assessment of degradations in telephony speech signals up to fullband | |
| General | ITU-T P Suppl. 23 | ITU-T coded-speech database | |
| Recommendation | ITU-T G.711.0 | Lossless compression of G.711 pulse code modulation | |
| Recommendation | ITU-T G.711.1 | Wideband embedded extension for ITU-T G.711 pulse code modulation | |
| Recommendation | ITU-T G.718 | Frame error robust narrow-band and wideband embedded variable bit-rate coding of speech and audio from 8-32 kbit/s | |
| Recommendation | ITU-T G.719 | Low-complexity, full-band audio coding for high-quality, conversational applications | |
| Recommendation | ITU-T G.720.1 | Generic sound activity detector | |
| Recommendation | ITU-T G.722 | 7 kHz audio-coding within 64 kbit/s | |
| Recommendation | ITU-T G.722.1 | Low-complexity coding at 24 and 32 kbit/s for hands-free operation in systems with low frame loss | |
| Recommendation | ITU-T G.722.2 | Wideband coding of speech at around 16 kbit/s using Adaptive Multi-Rate Wideband (AMR-WB) | |
| Recommendation | ITU-T G.723.1 | Dual rate speech coder for multimedia communications transmitting at 5.3 and 6.3 kbit/s | |
| Recommendation | ITU-T G.726 | 40, 32, 24, 16 kbit/s Adaptive Differential Pulse Code Modulation (ADPCM) | |
| Recommendation | ITU-T G.727 | 5-, 4-, 3- and 2-bit/sample embedded adaptive differential pulse code modulation (ADPCM) | |
| Recommendation | ITU-T G.728 | Coding of speech at 16 kbit/s using low-delay code excited linear prediction | |
| Recommendation | ITU-T G.729 | Coding of speech at 8 kbit/s using conjugate-structure algebraic-code-excited linear prediction (CS-ACELP) | |
| Recommendation | ITU-T G.729.1 | G.729-based embedded variable bit-rate coder: An 8-32 kbit/s scalable wideband coder bitstream interoperable with G.729 | |
| Recommendation | ITU-T V.56 ter | Test procedure for evaluation of 2-wire 4 kHz voiceband duplex modems | |
| General | ITU-T T.24 | Standardized digitized image set | |
| Recommendation | ITU-T T.83 | Information technology – Digital compression and coding of continuous-tone still images: Compliance testing | |
| Recommendation | ITU-T T.87 | Information technology – Lossless and near-lossless compression of continuous-tone still images – Baseline | |
| Recommendation | ITU-T T.802 | Information technology – JPEG 2000 image coding system: Motion JPEG 2000 | |
| Recommendation | ITU-T T.803 | Information technology – JPEG 2000 image coding system: Conformance testing | |
| Recommendation | ITU-T T.808 | Information technology – JPEG 2000 image coding system: Interactivity tools, APIs and protocols | |
| Recommendation | ITU-T T.834 | Information technology – JPEG XR image coding system – Conformance testing | |
| Recommendation | ITU-T T.840.1 | Information technology – JPEG AI learning-based image coding system: Core coding system | |
| Recommendation | ITU-T T.870 | Information technology – Lossless and near-lossless compression of continuous-tone still images: Extensions | |
| General | ITU-T H Suppl. 1 | Application profile – Sign language and lip-reading real-time conversation using low bit rate video communication | |
| Recommendation | ITU-T H.264.1 | Conformance specification for ITU-T H.264 advanced video coding | |
| Recommendation | ITU-T H.265.1 | Conformance specification for ITU-T H.265 high efficiency video coding | |
| Recommendation | ITU-T H.266.1 | Conformance specification for ITU-T H.266 versatile video coding | |
| Recommendation | ITU-T J.341 | Objective perceptual multimedia video quality measurement of HDTV for digital cable television in the presence of a full reference | |
| Recommendation | ITU-T G.1050 | Network model for evaluating multimedia transmission performance over Internet Protocol | |
| Recommendation | ITU-T H.810 | Interoperability design guidelines for personal connected health systems: Introduction |