H.2 Grid Positions

26.1323GPPRelease 18Speech and video telephony terminal acoustic test specificationTS

Tools: ARFCN - Frequency Conversion for 5G NR/LTE/UMTS/GSM

Several shifts of 1 cm in Z_e and Y_e direction according to Table H.1 are evaluated around an initial and arbitrarily chosen ECRP at d_z=0 mm and d_y=20 mm (according to definitions of Annex E.3 of [18]).

Table H.1: Shifts around initial ECRP

Shift	Offset Z_e [mm]	Offset Y_e [mm]	Type
S0	0	0	Mandatory
S1	0	-10	Mandatory
S2	+10	0	Mandatory
S3	0	+10	Mandatory
S4	-10	0	Mandatory
S5	+10	-10	Recommended
S6	+10	+10	Recommended
S7	-10	+10	Recommended
S8	-10	-10	Recommended

The shifts shall be reported. Figure H.1 illustrates the five mandatory (indicated in blue) and four optional (indicated in red) shifts relative to the centre point (indicated in green).

Figure H.1: Evaluation shifts for determination of ECRP

H.3 Measurement procedure

H.3.1 Overview

The iterative procedure to determine ECRP and nominal volume applies for all bandwidths and can be conducted in two different ways, as described in clause H.3.2 and H.3.3. Both methods shall be supported by the test equipment. The procedure in clause H.3.2 is recommended, the procedure in H.3.3 may be used as an alternative. The procedure used for testing shall be reported.

H.3.2 Evaluation of all shifts per volume setting

2) The test signal to be used for the measurements shall be the British-English single talk sequence described in ITU-T Recommendation P.501 [22]. The test signal level shall be -16 dBm0 measured at the digital reference point or the equivalent analogue point. Level calculation and bandwidth-specific pre-filtering shall be applied according to clause 5.4 on the test signal.

3) Receive loudness rating (RLR) and receive frequency response (RFR) are calculated from the same recording:

– RFR is calculated according to clause 7.4.2 for narrowband, clause 8.4.2 for wideband, clause 9.4.2 for super-wideband and 10.4.2 for fullband.

– RLR is calculated according to clause 7.2.2.2 for narrowband, clause 8.2.2.2 for wideband, clause 9.2.2.2 for super-wideband and 10.2.2.2 for fullband.

4) The measurement shall be carried out for the initial ECRP shift (S0) and for each mandatory shift according to Table H.1 (S1-S4). It is recommended to consider the optional shifts (S5-S8) as well.

5) For the current volume control setting…

a) The repeated RFR measures at each frequency band are linearily averaged across shifts, resulting in an average RFR spectrum.

b) The number of nominal RLR values (2 dB ± 3 dB) are counted.

6) If manufacturer-defined nominal volume control setting is provided:
No further iterations are required.

If no manufacturer-defined nominal volume control setting is provided:
Steps 2) to 5) are repeated for volume control decreased by one step until all RLR values obtained more than 5 dB across all shifts.

7) The maximum number of valid RLR values is determined across all measured volume control settings. Each volume setting providing this amount of valid RLR values are considered for the next step of the analysis. If multiple volume control settings obtain the same amount of nominal RLR values, all of them are considered for the next analysis step.
If nominal volume setting cannot be achieved at any shift and volume setting (i.e., all RLR values are either too high or too low), it is not possible to determine the ECRP with the present method.

8) For each single shift providing the determined nominal volume setting, the absolute difference (in dB) to the average RFR is calculated within the bandwidth-dependent frequency range according to clause 5.4. The shift providing nominal RLR and lowest difference to the average RFR (see step 4) is considered as the ECRP for testing.

H.3.3 Evaluation of all volume settings per shift:

It is also possible to apply the method in a transposed way, i.e., for each shift, all volume steps are consecutively evaluated. The results obtained this way are equivalent to the ones of the default order. However, due to the non-applicable stop condition (see step 6), in some cases it might be necessary to conduct more measurements than for the default order to obtain the same ECRP result.

1) The handset terminal is setup as described in clause 5 and the volume control is set to maximum. In case a manufacturer-defined nominal volume control setting is provided, this setting shall be used. An arbitrary shift according to Table H.1 is applied. It is recommended to start at the initial ECRP shift S0.

3) Receive loudness rating (RLR) and receive frequency response (RFR) are calculated from the same recording:

– RFR is calculated according to clause 7.4.2 for narrowband, clause 8.4.2 for wideband, clause 9.4.2 for super-wideband and 10.4.2 for fullband.

– RLR is calculated according to clause 7.2.2.2 for narrowband, clause 8.2.2.2 for wideband, clause 9.2.2.2 for super-wideband and 10.2.2.2 for fullband.

4) If manufacturer-defined nominal volume control setting is provided:
No further iterations are required.

If no manufacturer-defined nominal volume control setting is provided:
Steps 2) to 3) are repeated for volume control decreased by one step until minimum volume setting is reached.

5) Steps 2) to 4) are repeated for each mandatory shift according to Table H.1 (S0-S4). It is recommended to consider the optional shifts (S5-S8) as well.

6) After RFR and RLR measurements are completed, the following calculations are performed for each volume setting:

a) The repeated RFR measures at each frequency band are linearily averaged across shifts, resulting in an average RFR spectrum.

b) The number of nominal RLR values (2 dB ± 3 dB) are counted.

7) The maximum number of valid RLR values is determined across all volume control settings. Each volume setting providing this amount of valid RLR values are considered for the next step of the analysis. If multiple volume control settings obtain the same amount of nominal RLR values, all of them are considered for the next analysis step.
If nominal volume setting cannot be achieved at any shift and volume setting (i.e., all RLR values are either too high or too low), it is not possible to determine the ECRP with the present method.

Annex I: Change History

TSG SA#	TSG doc	Spec	CR	Rev	Cat	Vers	New Vers	Subject
08							3.0.0	Approved
09	SP-000397	26.132	001		F	3.0.0	3.1.0	Handheld hands-free Test Setup
11	SP-010107	26.132	002	1	F	3.1.0	3.2.0	Harmonisation of test methods for acoustics between 3GPP and GSM
11		26.132				3.2.0	4.0.0	Release 4
11	SP-010107	26.132	003	1	B	4.0.0	5.0.0	Compatibility with testing wideband telephony transmission performance
13	SP-010454	26.132	004		B	5.0.0	5.1.0	Extended scope of test signals for Ambient Noise Rejection
13	SP-010454	26.132	006		F	5.0.0	5.1.0	Restricted scope of ITU-T P.501 test signals for 3G acoustic tests
13	SP-010454	26.132	008		A	5.0.0	5.1.0	Bandwidth of test signals for acoustic testing
15	SP-020080	26.132	011	1	A	5.1.0	5.2.0	Correction of references and editorial changes (wrong decimal separators)
16	SP-020435	26.132	016		F	5.2.0	5.3.0	Correction on ANR test for hands-free Ues
21	SP-030445	26.132	026		F	5.3.0	5.4.0	Loudness rating measurements at lower bit rates
25	SP-040649	26.132	028		C	5.4.0	6.0.0	Change of sending distortion test case
35	SP-070026	26.132	0030		F	6.0.0	6.1.0	Reference Update for ITU-T Recommendation P.57 "Artificial Ears"
35	SP-070026	26.132	0031	1	F	6.0.0	6.1.0	Update of reference [16] to P.79-2001 Annex G
35	SP-070026	26.132	0032	1	F	6.0.0	6.1.0	Distinction between narrow-band and wideband telephony in the frequency ranges and loudness rating and STMR weights, and in ANR calculation
36		26.132				6.1.0	7.0.0	Version for Release 7
38	SP-070759	26.132	0034	2	F	7.0.0	7.1.0	Changing the sidetone test to allow type 3.3 or 3.4 artificial ears
42	SP-080674	26.132	0035	1	F	7.1.0	7.2.0	Correction to allow wideband testing for GSM terminals
42	SP-080685	26.132	0037	3	C	7.2.0	8.0.0	Updated test methods for wideband terminal acoustics
43	SP-090015	26.132	0038		F	8.0.0	8.1.0	Clarification on Distortion with psophometric filter
43	SP-090018	26.132	0036	2	C	8.1.0	9.0.0	Speech and video telephony terminal acoustic test
45	SP-090568	26.132	0040	2	A	9.0.0	9.1.0	Correction of STMR calculation
45	SP-090573	26.132	0041	1	F	9.0.0	9.1.0	Handling Acoustic Testing with Noise Suppression Algorithms Employed
47	SP-100021	26.132	0042	1	F	9.1.0	9.2.0	Correction of distortion measurements
51	SP-110042	26.132	0043	5	B	9.2.0	10.0.0	Alignment of 3GPP Audio Test Case Specification
52	SP-110304	26.132	0045	3	C	10.0.0	10.1.0	Remaining modifications to EAAT WI
53	SP-110549	26.132	0047	1	F	10.1.0	10.2.0	Correction to Acoustic Echo Control
54	SP-110793	26.132	0048	1	F	10.2.0	10.3.0	Correction to Ambient Noise Rejection Test Procedure
54	SP-110793	26.132	0049		F	10.2.0	10.3.0	Clarification of Stability loss test signal
55	SP-120022	26.132	0050	1	F	10.3.0	10.4.0	Correction of receiving distortion
57	SP-120501	26.132	0053	2	F	10.4.0	10.5.0	Addition of 1/12 octave diffuse field table values with frequencies according to IEC 1260 (for information)
57	SP-120503	26.132	0052	3	B	10.5.0	11.0.0	Addition of UE delay test method
57	SP-120503	26.132	0054	1	B	10.5.0	11.0.0	Extension of Acoustic Tests
58	SP-120760	26.132	0055	1	F	11.0.0	11.1.0	Correction of references and levels
59	SP-130017	26.132	0056		F	11.1.0	11.2.0	Alignment of free-field definition with ISO 3745 and ITU-T Rec. P.340
59	SP-130017	26.132	0057	1	F	11.1.0	11.2.0	Voiding of ambient noise rejection test cases
60	SP-130185	26.132	0058	1	F	11.2.0	11.3.0	Update of the reference algorithm for echo control characteristics evaluation in Annex B
60	SP-130185	26.132	0061	2	F	11.2.0	11.3.0	UE delay test method
60	SP-130189	26.132	0059		B	11.3.0	12.0.0	Adding receiving distortion tests at frequencies lower than 1020Hz
60	SP-130189	26.132	0060	2	B	11.3.0	12.0.0	Update acoustic test method specification to cover MTSI speech-only services over LTE (narrowband and wideband)
62	SP-130568	26.132	0063		A	12.0.0	12.1.0	Corrections to references
62	SP-130563	26.132	0067	2	A	12.0.0	12.1.0	STMR – adaptation to modern form factors
62	SP-130573	26.132	0068	1	F	12.0.0	12.1.0	Updates of LTE radio conditions for acoustic testing
64	SP-140216	26.132	0069	2	F	12.1.0	12.2.0	Corrections of general test method applicability description and Headset UE sidetone test method
65	SP-140469	26.132	0070	1	B	12.2.0	12.3.0	LTE UE delay test methods
66	SP-140721	26.132	0072		A	12.3.0	12.4.0	Correction to UE receiving loudness rating performance test for wideband telephony
66	SP-140719	26.132	0079	1	A	12.3.0	12.4.0	Correction of broadband signal level at the hands free reference point
66	SP-140731	26.132	0080	2	B	12.3.0	12.4.0	Acoustic test methods for super-wideband and fullband telephony
67	SP-150090	26.132	0082		F	12.4.0	12.5.0	Minor corrections and editorial enhancements to acoustic test method descriptions
68	SP-150209	26.132	0083	2	F	12.5.0	12.6.0	Correcting test conditions for Handset/headset narrowband/wideband STMR
69	SP-150436	26.132	0085		F	12.6.0	12.7.0	Correction of descriptions of diffuse-field correction
69	SP-150445	26.132	0084	1	B	12.7.0	13.0.0	UE delay test methods for MTSI-based services over LTE with the EVS codec
70	SP-150651	26.132	0087	1	B	13.0.0	13.1.0	Additional UE delay test methods for MTSI-based services over LTE with the EVS codec
71	SP-160065	26.132	0089	1	A	13.1.0	13.2.0	Clarification on double measurement for SWB frequency characteristics
71	SP-160067	26.132	0090	1		13.1.0	13.2.0	Addition of test methods for objective speech quality in the presence of background noise for speakerphone (hand-held hands-free) operation

Change history
Date	Meeting	TDoc	CR	Rev	Cat	Subject/Comment	New version
2016-06	72	SP-160260	0091	1	C	Support of DTX and other corrections	13.3.0
2017-03	75					Versione per Release 14	14.0.0
2017-06	76	SP-170325	0093	2		Extension of UE Delay Test Methods	14.1.0
2017-06	76	SP-170321	0094	2	B	Addition of SWB and FB noise suppression test methods	14.1.0
2018-06	80	SP-180265	0096	1	F	Correction of unclear wording in delay test specification	14.2.0
2018-06	80	SP-180273	0095	3	B	Test method for RLR in the presence of background noise	15.0.0
2018-09	81	SP-180648	0097	–	C	Modification of speech quality assessment method	15.1.0
2019-03	83	SP-190038	0098	2	F	Use of default EVS SID update	16.0.0
2019-09	85	SP-190935	0099	3	B	Support of NR	16.1.0
2020-03	87-e	SP-200103	0102	–	B		16.2.0
2022-01	SA#94-e	SP-211350	0105	–	B		17.0.0
2022-03	SA#95-e	SP-220034	0106		B	Method for determining ECRP for HaNTE-devices	17.1.0
2022-12	SA#98-e	SP-221048	0107	1	C	Vehicle-mounted hands-free UE	18.0.0