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c603b594831dc146c921d8bfe9c21ca1 | 103 834-2 | 5 Test descriptions for TTI implementations | |
c603b594831dc146c921d8bfe9c21ca1 | 103 834-2 | 5.1 Test descriptions on ETSI TS 103 666-1 requirements | |
c603b594831dc146c921d8bfe9c21ca1 | 103 834-2 | 5.1.1 Accessor authentication | The Accessor authentication is tested according to clause 5.5.2 of the present document. |
c603b594831dc146c921d8bfe9c21ca1 | 103 834-2 | 5.1.2 Protocol layers | Protocol layer requirements listed in clause 4.1.2 of the present document do not require TTI specific test descriptions. It is suggested to run appropriate tests from ETSI TS 103 999-1 [3] with running the TTI as defined in the present document. |
c603b594831dc146c921d8bfe9c21ca1 | 103 834-2 | 5.2 Test descriptions on ETSI TS 103 666-2 requirements | The test descriptions on the ETSI TS 103 666-2 [2] are covered by the clause 5.4. |
c603b594831dc146c921d8bfe9c21ca1 | 103 834-2 | 5.3 Test descriptions on ETSI TS 103 999-1 requirements | The requirements are covered by the test descriptions defined in the clause 5.5. 5.4 Test descriptions on GP Virtual Primary Platform requirements FFS (see note). NOTE: Test descriptions from GlobalPlatform, relevant for the ETSI TTI are expected to be tested in accordance to GlobalPlatform specifications. As soon as G... |
c603b594831dc146c921d8bfe9c21ca1 | 103 834-2 | 5.5 Test descriptions on ETSI TS 103 834-1 requirements | |
c603b594831dc146c921d8bfe9c21ca1 | 103 834-2 | 5.5.1 TTI underlayers | |
c603b594831dc146c921d8bfe9c21ca1 | 103 834-2 | 5.5.1.1 Configurations | |
c603b594831dc146c921d8bfe9c21ca1 | 103 834-2 | 5.5.1.1.1 CTMQ_001 | Configuration ID CTMQ_001 Configuration description Test Tool TTI MQTT client Terminal TTI MQTT client MQTT broker |
c603b594831dc146c921d8bfe9c21ca1 | 103 834-2 | 5.5.1.2 Procedures | 5.5.1.2.1 PTMQ_001 - Retrieving of the MQTT credentials Procedure ID PTMQ_001 Procedure objectives The other host shall be able to open a pipe session to the Identity gate of the TTI host. From the GATE_LIST registry, the UUID of the root accessor shall be listed. If the procedure is successful, then a pipe session is ... |
c603b594831dc146c921d8bfe9c21ca1 | 103 834-2 | 5.5.1.3 Test Descriptions | |
c603b594831dc146c921d8bfe9c21ca1 | 103 834-2 | 5.5.1.3.1 TMQ_001 - TTI_UL client/server connection | Test ID TMQ_001 Test objectives The MQTT client of the TT shall be able to transfer the URL of its TTI_UL server to the MQTT client of the terminal. Configuration reference CTMQ_001 Initial conditions The procedure PTMQ_001 shall be successfully executed. Test sequence Step Description Req.ID 1 The MQTT client of the T... |
c603b594831dc146c921d8bfe9c21ca1 | 103 834-2 | 5.5.2 TTI Accessor Authentication Service | |
c603b594831dc146c921d8bfe9c21ca1 | 103 834-2 | 5.5.2.1 Configurations | The configurations defined in ETSI TS 103 999-1 [3], clause 6.13.1 apply with the following exceptions: 1) SSP Host Domain is replaced by TTI Host Domain. 2) SSP Host is replaced by TTI Host. |
c603b594831dc146c921d8bfe9c21ca1 | 103 834-2 | 5.5.2.2 Procedures | The procedures defined in ETSI TS 103 999-1 [3], clause 6.13.2 apply with the following exceptions: 1) SSP is replaced by TTI. 2) SSP Host is replaced by TTI Host. |
c603b594831dc146c921d8bfe9c21ca1 | 103 834-2 | 5.5.2.3 Test Descriptions | The test descriptions defined in ETSI TS 103 999-1 [3], clause 6.13.3 apply with the following exceptions: 1) SSP is replaced by TTI. 2) SSP Host is replaced by TTI Host. The test descriptions support the requirement RQ0613_001, RU0601_001, RU0601_002, RU0601_003. ETSI ETSI TS 103 834-2 V17.0.0 (2022-12) 20 Release 17 |
c603b594831dc146c921d8bfe9c21ca1 | 103 834-2 | 5.5.3 TTI Control Service | |
c603b594831dc146c921d8bfe9c21ca1 | 103 834-2 | 5.5.3.1 Configurations | |
c603b594831dc146c921d8bfe9c21ca1 | 103 834-2 | 5.5.3.1.1 CTCS_001 | Configuration ID CTCS_001 Configuration description |
c603b594831dc146c921d8bfe9c21ca1 | 103 834-2 | 5.5.3.1.2 CTCS_002 | Configuration ID CTCS_002 Configuration description Other Host Domain (TT) Other Host A Administration Administration Gate Identity Application Identity Application Gate TTI Host Domain (SUT) TTI Host Administration Gate Identity Service Identity Service Gate Administration AA Application AA Application Gate AA Service... |
c603b594831dc146c921d8bfe9c21ca1 | 103 834-2 | 5.5.3.1.3 CTCS_003 | Configuration ID CTCS_003 Configuration description Other Host Domain (TT) Other Host A Administration Administration Gate Identity Application Identity Application Gate TTI Host Domain (SUT) TTI Host Administration Gate Identity Service Identity Service Gate Administration TTI Control Application TTI Control Applicati... |
c603b594831dc146c921d8bfe9c21ca1 | 103 834-2 | 5.5.3.1.4 ASN.1 Configuration | The following configuration is used for the procedures and the test descriptions. -- ASN1START eTTI-ID-CS UUID::='09560B78BED958B9A5FF6CAA8384D556'H -- ETSI TTI Control Service identifier -- urn:etsi.org:asn.1:accessor:tti eTTI-ACC UUID::='0F26EB7CEF785F8E84FCB64C9284638E'H eTTI-ACC-ROOT UUID::='DD61116FF0DD57F48A4F52E... |
c603b594831dc146c921d8bfe9c21ca1 | 103 834-2 | 5.5.3.2 Procedures | |
c603b594831dc146c921d8bfe9c21ca1 | 103 834-2 | 5.5.3.2.1 PTCS_001 - Open a pipe session with the Identity gate | Procedure ID PTCS_001 Procedure objectives The other host shall be able to open a pipe session to the Identity gate of the TTI host. From the GATE_LIST registry, the UUID of the root accessor shall be listed. If the procedure is successful, then a pipe session is open between the identity application in the other host ... |
c603b594831dc146c921d8bfe9c21ca1 | 103 834-2 | 5.5.3.2.2 PTCS_002 - Open a pipe session with the Accessor Authentication Service | Procedure ID PTCS_002 Procedure objectives The other host shall be able to open a pipe session to the Authentication Service gate of the TTI host. If the procedure is successful then a pipe session is open between the Accessor Authentication Application in the other host and the Accessor Authentication Service in the T... |
c603b594831dc146c921d8bfe9c21ca1 | 103 834-2 | 5.5.3.2.3 PTCS_003 - Authentication of the root accessor | Procedure ID PTCS_003 Procedure objectives The root accessor shall be able to be authenticated with the Accessor Authentication Service by using: • The aAAS-OP-GET-CHALLENGE-Service-Command command. • The aAAS-OP-AUTHENTICATE-ACCESSOR-Service-Command command. The authentication mean is based on the authentication token... |
c603b594831dc146c921d8bfe9c21ca1 | 103 834-2 | 5.5.3.2.4 PTCS_004 - Access to the Authentication Service from the root accessor | Procedure ID PTCS_004 Procedure objectives The authenticated root accessor shall be able to access the Accessor Authentication Service by using: • The aAAS-OP-ACCESS-SERVICE-Service-Command command. If the procedure is successful then the accessor can open a secure pipe session to the Accessor Authentication Service. C... |
c603b594831dc146c921d8bfe9c21ca1 | 103 834-2 | 5.5.3.2.6 PTCS_006 - Creation of an accessor TTI Control Service Accessor (TTI1) | Procedure ID PTCS_006 Procedure objectives The Accessor Authentication Application shall be able to create an TTI1 accessor from the Accessor Authentication Service using an aAAS-ADMIN-CREATE-ACCESSOR-Service- Command. TTI Control Service Accessor 1 (TTI1): Accessor identity: eTTI-ACC The TTI1 accessor authentication m... |
c603b594831dc146c921d8bfe9c21ca1 | 103 834-2 | 5.5.3.2.8 PTCS_008 - Authentication of the accessor (TTI1) | Procedure ID PTCS_008 Procedure objectives The Accessor Authentication Application shall be able to authenticate TTI1 accessor from the Accessor Authentication Service using an aAAS-OP-AUTHENTICATE-ACCESSOR-Service- Command. Configuration reference CTCS_002 Initial conditions The procedure PTCS_0062 shall be successful... |
c603b594831dc146c921d8bfe9c21ca1 | 103 834-2 | 5.5.3.2.9 PTCS_009 - Access to TTI Control Service with secure pipe (TTI1) | Procedure ID PTCS_009 Procedure objectives The Accessor Authentication Application on behalf of TTI Control Service 1 (TTI1) accessor shall be able to access the TTI Control Service from the Accessor Authentication Service using an aAAS-OP-ACCESS-SERVICE-Service-Command. The TTI Control Service Identifier is: 09560b78-... |
c603b594831dc146c921d8bfe9c21ca1 | 103 834-2 | 5.5.3.2.11 PTCS_011 - Access to TTI Control Service with secure pipe (ROOT) | Procedure ID PTCS_011 Procedure objectives The Accessor Authentication Application on the behalf of ROOT accessor shall be able to access the TTI Control Service from the Accessor Authentication Service using an aAAS-OP-ACCESS-SERVICE-Service-Command. The TTI Control Service identifier is 09560b78-bed9-58b9-a5ff-6caa83... |
c603b594831dc146c921d8bfe9c21ca1 | 103 834-2 | 5.5.3.3 Test Descriptions | |
c603b594831dc146c921d8bfe9c21ca1 | 103 834-2 | 5.5.3.3.1 TTI-OP-GET-CAPABILITIES | 5.5.3.3.1.1 TCS_001 - Get Capabilities Test ID TCS_001 Test objectives The TTI Control Application shall be able to retrieve the capabilities of the TTI Control Service using TTI-OP-GET-CAPABILITIES-Service-Command. Configuration reference CTCS_003 Initial conditions The procedure PTCS_010 is successfully executed. -- ... |
c603b594831dc146c921d8bfe9c21ca1 | 103 834-2 | 5.5.3.3.2 TTI-ADMIN-IMPERSONATE | 5.5.3.3.2.1 TCS_002 - Successful Host impersonation Test ID TCS_002 Test objectives The TTI CONTROL application gate shall be able to impersonate a host. Configuration reference CTCS_003 Initial conditions The procedure PTCS_010 shall be successfully executed. Test sequence Step Description Req.ID 1 TTI Control Applica... |
c603b594831dc146c921d8bfe9c21ca1 | 103 834-2 | 5.5.3.3.3 TTI-ADMIN-UPDATE-ACL | 5.5.3.3.3.1 TCS_004 - Successful ACL update Test ID TCS_004 Test objectives The TTI Control Application gate shall be able to update the ACL related to the TTI interface resource. Configuration reference CTCS_003 Initial conditions The procedure PTCS_012 shall be successfully executed. Test sequence Step Description Re... |
c603b594831dc146c921d8bfe9c21ca1 | 103 834-2 | 5.5.4 TTI Data Service | |
c603b594831dc146c921d8bfe9c21ca1 | 103 834-2 | 5.5.4.1 Configurations | |
c603b594831dc146c921d8bfe9c21ca1 | 103 834-2 | 5.5.4.1.1 CTDS_001 | Configuration ID CTDS_001 Configuration description Other Host Domain (TT) Other Host A Administration Administration Gate RDE Application RDE Application Gate TTI Host Domain (SUT) TTI Host Administration Gate RDE Service RDE Service Gate Administration TTI Control Application TTI Control Application Gate TTI Control ... |
c603b594831dc146c921d8bfe9c21ca1 | 103 834-2 | 5.5.4.2 Procedures | |
c603b594831dc146c921d8bfe9c21ca1 | 103 834-2 | 5.5.4.2.1 PTDS_001 - Access to TTI RDE Service for TTI1 with secure pipe | Procedure ID PTDS_001 Procedure objectives The Accessor Authentication Application on the behalf of TTI RDE Service 1 (TTI1) accessor shall be able to access the TTI Control Service from the Accessor Authentication Service using an aAAS-OP-ACCESS-SERVICE-Service-Command. The TTI RDE Service identifier is 09560b78-bed9-... |
c603b594831dc146c921d8bfe9c21ca1 | 103 834-2 | 5.5.4.3 Test Descriptions | |
c603b594831dc146c921d8bfe9c21ca1 | 103 834-2 | 5.5.4.3.1 TDS_001 - Tunnelling of SCL packets | Test ID TDS_001 Test objectives The impersonated host shall be able to run any tests as defined in the ETSI TS 103 999-1 [3] and ETSI TS 103 999-2 [4]. Configuration reference CTDS_001 Initial conditions The procedure PTDS_001 shall be executed. The procedure PTDS_002 shall be executed. Test sequence Step Description R... |
c603b594831dc146c921d8bfe9c21ca1 | 103 834-2 | 5.5.4.3.2 TDS_002 - Tunnelling of SCL packets | Test ID TDS_002 Test objectives The impersonated host shall not be able to run any tests from the clause 10.2 as defined in the ETSI TS 103 999-1 [3]. Configuration reference CTDS_001 Initial conditions The test description TCS_006 shall be executed. The procedure PTDS_001 shall be executed. The procedure PTDS_002 shal... |
c603b594831dc146c921d8bfe9c21ca1 | 103 834-2 | 5.5.5 RDE Data Service | |
c603b594831dc146c921d8bfe9c21ca1 | 103 834-2 | 5.5.5.1 Configurations | |
c603b594831dc146c921d8bfe9c21ca1 | 103 834-2 | 5.5.5.1.1 CRDE_001 | Configuration ID CRDE_001 Configuration description TTI Host Domain TTI Host ROUTER 2 policies Timestamped copy of SCL packets TTI Control Service TTI Control Service Gate Router Data Extractor RDE Service Gate AA Control Service AA Control Service Gate Other Host Domain Tester Host TTI Control Application TTI Control ... |
c603b594831dc146c921d8bfe9c21ca1 | 103 834-2 | 5.5.5.2 Procedures | |
c603b594831dc146c921d8bfe9c21ca1 | 103 834-2 | 5.5.5.2.1 PRDE_001 - Creation of an RDE Service gate | Procedure ID PRDE_001 Procedure objectives The TTI Host requests the creation of an RDE Service gate Configuration reference CRDE_001 Initial conditions The TT Host got confirmed the accessor authentication service capability by the TTI host. The TT Host got a confirmation for the authentication of an accessor. Procedu... |
c603b594831dc146c921d8bfe9c21ca1 | 103 834-2 | 5.5.5.2.2 PRDE_0002 - Open RDE data service session | Procedure ID PRDE_002 Procedure objectives The TT Host requests the authentication service capability from the TTI host. Configuration reference CRDE_001 Initial conditions None Procedure sequence Step Description 1 Administration gate in the other host sends EVT_ADM_BIND to Administration gate in the SSP host with: • ... |
c603b594831dc146c921d8bfe9c21ca1 | 103 834-2 | 5.5.5.3 Test Descriptions | |
c603b594831dc146c921d8bfe9c21ca1 | 103 834-2 | 5.5.5.3.1 RDE_001 - Extract Time Stamp | Test ID RDE_001 Test objectives The other host shall be able to collect the timestamped EVT_RDE event from the RDE service. Any tests defined in the ETSI TS 103 999-1 [3] and ETSI TS 103 999-2 [4] can be executed from the impersonated host. Configuration reference CDRE_001 Initial conditions The procedure PDRE_001 shal... |
56042d83db3b8f2bc1992455e4353d95 | 103 802 | 1 Scope | The present document provides an instrumental model for the signal-based prediction of echo artefacts that may occur in telecommunication devices of all kinds. This prediction model assesses audible degradations of a virtual end-to-end communication scenario, including partial masking via sidetone as described in ETSI ... |
56042d83db3b8f2bc1992455e4353d95 | 103 802 | 2 References | |
56042d83db3b8f2bc1992455e4353d95 | 103 802 | 2.1 Normative references | References are either specific (identified by date of publication and/or edition number or version number) or non-specific. For specific references, only the cited version applies. For non-specific references, the latest version of the referenced document (including any amendments) applies. Referenced documents which a... |
56042d83db3b8f2bc1992455e4353d95 | 103 802 | 2.2 Informative references | References are either specific (identified by date of publication and/or edition number or version number) or non-specific. For specific references, only the cited version applies. For non-specific references, the latest version of the referenced document (including any amendments) applies. NOTE: While any hyperlinks i... |
56042d83db3b8f2bc1992455e4353d95 | 103 802 | 3 Definition of terms, symbols and abbreviations | |
56042d83db3b8f2bc1992455e4353d95 | 103 802 | 3.1 Terms | For the purposes of the present document, the terms given in Recommendation ITU-T P.10/G.100 [i.2] and the following apply: device-side: end-point of a telecommunication connection, which is dedicated to and operated by a device under test ETSI ETSI TS 103 802 V1.2.1 (2025-03) 8 echo impairment: artefact generated by t... |
56042d83db3b8f2bc1992455e4353d95 | 103 802 | 3.2 Symbols | For the purposes of the present document, the symbols given in Recommendation ITU-T P.10/G.100 [i.2] and the following apply: ΔT Duration of delay introduced in the transmission path dB Decibel dBSPL Sound Pressure Level in dB, referenced to 20 µPa dBPa Sound Pressure Level in dB, referenced to 1 Pa dBV Voltage in dB, ... |
56042d83db3b8f2bc1992455e4353d95 | 103 802 | 3.3 Abbreviations | For the purposes of the present document, the abbreviations given in Recommendation ITU-T P.10/G.100 [i.2] and the following apply: ASL Active Speech Level DF Diffuse-Field DUT Device Under Test FB FullBand NOTE: Audio bandwidth from 20 Hz to 20 kHz. FF Free-Field MOS Mean Opinion Score ETSI ETSI TS 103 802 V1.2.1 (202... |
56042d83db3b8f2bc1992455e4353d95 | 103 802 | 4 Measurement procedure | |
56042d83db3b8f2bc1992455e4353d95 | 103 802 | 4.1 Overview | Figure 1 illustrates the virtual communication scenario, which is the basis for the TPLT design as described in ETSI TS 103 801 [1]. The DUT is located on the left (device-side) and the virtual talker/listener on the right (reference-side). For the application of the prediction model, measurement signals have to be ins... |
56042d83db3b8f2bc1992455e4353d95 | 103 802 | 4.2 Positioning of devices | If positioning instructions are not provided by an underlying test specification, the terminal shall be positioned in a typical manner and best possible reproducibility: • For handset terminals, a HATS according to Recommendation P.58 [3] equipped with ear simulators of type 3.3, 4.3, or 4.4 according to Recommendation... |
56042d83db3b8f2bc1992455e4353d95 | 103 802 | 4.3 Test signals | The source speech material to be used for the measurements shall comply with clause 5.3 of ETSI TS 103 801 [1]. The single and double talk sequences described in clauses 7.3.5 (British English) and 7.4.1.3 (Mandarin) of Recommendation ITU-T P.501 [11] comply in general with these requirements, but further cropping into... |
56042d83db3b8f2bc1992455e4353d95 | 103 802 | 4.4 Echo signal recording | For the measurement, a downlink signal to the DUT has to be inserted at the POI in the same way as specified for the TPLT design of ETSI TS 103 801 [1]. This test signal shall reflect the transmission from the MRP of the talker at the reference-side to the POI and shall be generated according to one of the three follow... |
56042d83db3b8f2bc1992455e4353d95 | 103 802 | 5 Instrumental Prediction Model | |
56042d83db3b8f2bc1992455e4353d95 | 103 802 | 5.1 Overview | Figure 4 provides an overview on the different signals used in the measurement (see clause 4) and in the prediction model. The virtual listener at the reference-side perceives a superposition of two signal components: • The binaural self-hearing of the listener's own voice, denoted as xST(k). It is determined by filter... |
56042d83db3b8f2bc1992455e4353d95 | 103 802 | 5.2 Signal Acquisition | |
56042d83db3b8f2bc1992455e4353d95 | 103 802 | 5.2.1 Overview | The prediction model utilizes these two acoustic signal components xST(k) and eRCV(k) for the prediction of quality degradation. The two acoustic signal components xST(k) and eRCV(k) are only available in a complete end-to-end scenario, but not in a typical one-way measurement setup (from/to POI). Here only the electri... |
56042d83db3b8f2bc1992455e4353d95 | 103 802 | 5.2.2 End-to-end measurement setup | In an end-to-end setup, it is possible to measure the signals xST(k) and eRCV(k) directly, without access to the POI. However, the signals have to be separately available, and the following measurement steps are required: 1) xST(k) is directly be measured with a mouth-to-ear measurement at the DRP, including diffuse-fi... |
56042d83db3b8f2bc1992455e4353d95 | 103 802 | 5.2.3 Measurement setup with POI | In case POI access to the DUT is available, the usage of a real device at the reference side is not necessary and can be completely simulated in the same way as described in clause 5.4.5 of ETSI TS 103 801 [1]: • ST-Ref: The default sidetone filter according to clause 5.4.3.2 of ETSI TS 103 801 [1] shall be applied to ... |
56042d83db3b8f2bc1992455e4353d95 | 103 802 | 5.2.4 Sample duration | In accordance with clause 5.3 of ETSI TS 103 801 [1], the duration of the input signals shall not exceed 12,0 s and shall not contain more than four single sentences. It is recommended that analysis samples contain one or two single sentences and a duration of approximately 8 s to 10 s. Leading and trailing silence per... |
56042d83db3b8f2bc1992455e4353d95 | 103 802 | 5.3 Conventions on delay | |
56042d83db3b8f2bc1992455e4353d95 | 103 802 | 5.3.1 Overview | The overall delay TEcho between talking and listening at the reference-side is one of the most important quality indicators of residual echo and/or artefacts. In general, higher delays cause an increased degradation regarding perception of echo. Figure 6 provides an overview of the different delays that contribute to t... |
56042d83db3b8f2bc1992455e4353d95 | 103 802 | 5.3.2 Artificial network delay | The transmission network may also introduce additional delays TSND,Net and TRCV,Net to the echo signal eRCV(k). In a measurement setup with network simulators, these delays are usually known and compensated, in order to only evaluate the perceptual impact of the DUT roundtrip delay TRT,DUT. Thus, TSND,Net and TRCV,Net ... |
56042d83db3b8f2bc1992455e4353d95 | 103 802 | 5.3.3 External echo delay | The perceived echo delay TEcho corresponds to the delay between the two input signals xST(k) and eRCV(k) (see clause 5.1). In principle, it can be determined algorithmically and is also an integral part of the prediction model (see clause 5.4). However, in case the model is applied in the context of a larger performanc... |
56042d83db3b8f2bc1992455e4353d95 | 103 802 | 5.4 Calculation of echo delay and linearity measure | The perceived echo delay TEcho is an important parameter, which is used in the further stages of the prediction algorithm. In case it is not provided as an external value (see clause 5.3.3), it shall be calculated by means of the extended cross-correlation analysis introduced below, which is also used to obtain a linea... |
56042d83db3b8f2bc1992455e4353d95 | 103 802 | 5.5 Classification of time ranges | In order to determine the time ranges of active speech and echo, the classification algorithm according to Appendix II of Recommendation ITU-T G.160 [12] is applied on the sidetone signal xST(k). The first step is to classify energy frames of 10 ms (block-wise, no overlap) according to the method described in [12]. The... |
56042d83db3b8f2bc1992455e4353d95 | 103 802 | 5.6 Hearing model transformation | The hearing model according to clause 5 of ECMA 418-2 [13] is used to model the psychoacoustic signal representations of xST(k) and eRCV(k). After applying the basis specific loudness versus time, the corresponding time-frequency matrices are denoted as XST(l,m) and ERCV(l,m). The default configuration according to [13... |
56042d83db3b8f2bc1992455e4353d95 | 103 802 | 5.7 Self-masking of echo | As indicated in Figure 8, most parts of the echo component ERCV(l,m) at the reference-side are perceived while the talker's voice is still active. As a consequence, a certain portion of this degradation is masked by the talker's own voice. This residual echo R(l,m) is modelled by weighting the side-tone XST(l,m) with a... |
56042d83db3b8f2bc1992455e4353d95 | 103 802 | 5.8 Aggregate over time and frequency | The time-frequency representations of the masked residual echo R(l,m) and the (unmasked) echo ERCV(l,m) are first aggregated to loudness versus time by summing specific loudness versus frequency, as given by equations (17) and (18). Note that the modified step size of the Bark band resolution (Δz = 0,2) has to be consi... |
56042d83db3b8f2bc1992455e4353d95 | 103 802 | 5.9 Regression | In order to combine the loudness level metrics described in the previous clauses, Multivariate Adaptive Regression Splines (MARS) according to [15] are used. The MARS regression is a weighted sum of one or more so-called hinge functions as defined in equation (33): ℎ; = max(0, −) (33) The prediction of MOS-TQOf... |
56042d83db3b8f2bc1992455e4353d95 | 103 802 | 5.10 Indication for absence of an echo signal | In several cases, DUTs may not produce a typical echo signal at all, and only idle noise is captured at the POI in send direction. Parameters that were regarded as important for the assessment of echo (like, e.g. the overall delay TEcho, see clause 4 of ETSI TS 103 801 [1]), become perceptually irrelevant in this case.... |
56042d83db3b8f2bc1992455e4353d95 | 103 802 | 5.11 Compensation for idle noise | Idle noise introduced in the send direction can vary significantly across different DUTs and may impact the loudness level calculations as per equations (29) to (32). To address this, an average idle noise floor RCV is calculated using equation (35). All time instances of RCV, are then compensated according t... |
af00e45b7208320af4d15dc870bb407d | 103 801 | 1 Scope | The present document provides a framework for auditory testing of echo artefacts and double talk impairments that may occur in telecommunication devices of all kind. The present document assesses degradations in end-to-end scenarios as perceived by the listener at the reference-side. Only degradations caused by the ter... |
af00e45b7208320af4d15dc870bb407d | 103 801 | 2 References | |
af00e45b7208320af4d15dc870bb407d | 103 801 | 2.1 Normative references | References are either specific (identified by date of publication and/or edition number or version number) or non-specific. For specific references, only the cited version applies. For non-specific references, the latest version of the referenced document (including any amendments) applies. Referenced documents, which ... |
af00e45b7208320af4d15dc870bb407d | 103 801 | 2.2 Informative references | References are either specific (identified by date of publication and/or edition number or version number) or non-specific. For specific references, only the cited version applies. For non-specific references, the latest version of the referenced document (including any amendments) applies. NOTE: While any hyperlinks i... |
af00e45b7208320af4d15dc870bb407d | 103 801 | 3 Definition of terms, symbols and abbreviations | |
af00e45b7208320af4d15dc870bb407d | 103 801 | 3.1 Terms | For the purposes of the present document, the terms given in Recommendation ITU-T P.10/G.100 [1] and the following apply: attribute: description of a certain quality dimension of a stimulus, which is auditorily assessed by subjects in a listening test (e.g. annoyance of echo) NOTE: Multiple attributes may be assessed f... |
af00e45b7208320af4d15dc870bb407d | 103 801 | 3.2 Symbols | For the purposes of the present document, the symbols given in Recommendation ITU-T P.10/G.100 [1] and the following apply: aDT Attenuation (in dB) during double talk segments gEL Factor (in dB) to obtain a certain echo loss δ(k) Dirac impulse (linear transmission) ΔT Duration of delay introduced in the echo path dB de... |
af00e45b7208320af4d15dc870bb407d | 103 801 | 3.3 Abbreviations | For the purposes of the present document, the abbreviations given in Recommendation ITU-T P.10/G.100 [1] and the following apply: 5G NR 5G New Radio ACR Absolute Category Rating AEC Acoustic Echo Control ASL Active Speech Level CT Conversational Test DCR Degradation Category Rating DT Double Talk DUT Device Under Test ... |
af00e45b7208320af4d15dc870bb407d | 103 801 | 4.1 Overview | Figure 1 depicts the simplified technical principles and components of a bidirectional end-to-end speech communication between user A (left) and user B (right). On each side, a terminal with electric and acoustic send and receive path is used. Both paths include several signal processing blocks like AEC, ES, NR, AGC an... |
af00e45b7208320af4d15dc870bb407d | 103 801 | 4.2 Formation of Echo Artefacts | In the following, echo artefacts are described from the perspective of user B (reference side), as illustrated in Figure 3. User B starts talking and the reference device transmits the signal in sending direction via the network where delay, jitter and packet loss are possibly inserted. The signal is then played back a... |
af00e45b7208320af4d15dc870bb407d | 103 801 | 4.3 Formation of Double Talk Impairments | In the following, double talk impairments are described from the perspective of user B (reference side), as illustrated in Figure 1. The signal transmission paths (including network and signal-processing elements in terminals) are similar as for the formation of echo artefacts, but this time also user A is talking. A t... |
af00e45b7208320af4d15dc870bb407d | 103 801 | 5 Auditory Assessment of Conversations | |
af00e45b7208320af4d15dc870bb407d | 103 801 | 5.1 Overview | The subjective assessment described in the present document focuses on the performance evaluation of (real or simulated) devices under test, which include one or more of the aforementioned signal processing elements. In this case, user A is replaced by a HATS to reproducibly send and receive acoustic signals. User B co... |
af00e45b7208320af4d15dc870bb407d | 103 801 | 5.2 Possible Types of Listening Test | |
af00e45b7208320af4d15dc870bb407d | 103 801 | 5.2.1 Overview | Recommendations ITU-T P.831 [3] and P.805 [5] describe three suitable auditory test methods for evaluating interactive scenarios like echo artefacts or double talk impairments, i.e. Conversational Test (CT), Talking And Listening Test (TALT) and third-party listening test (TPLT). In the following clauses, a brief intro... |
af00e45b7208320af4d15dc870bb407d | 103 801 | 5.2.2 Conversational Test | A CT, as the most complex test method involves two parties actively conversing over a live connection. Conducting a CT is very time-consuming and complex. In particular, it is a very difficult task to control all individual influences such as talking behaviour, individual speech levels, use of terminals, etc. The conve... |
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