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5f58bd61f1d47a1156ca1080618be812 | 103 738 | 6.2.3 Receive Loudness Ratings | Requirements Handheld terminal Nominal value of RLR shall be +9 dB ± 3 dB. This value has to be fulfilled for at least one volume setting. Value of RLR at maximum volume setting shall be less than (louder) or equal to +5 dB. Range of volume control (RLR measured at minimum and maximum volume setting) shall be larger th... |
5f58bd61f1d47a1156ca1080618be812 | 103 738 | 6.2.4 Send Loudness Level | Requirements The nominal value of Send Loudness Level (SLL) shall be: SLL = 71 phon ± 4 phon Measurement method The test signal to be used for the measurements shall be the British-English single talk sequence described in clause 7.3.2 of Recommendation ITU-T P.501 [14]. The terminal is set up as described in clause 5.... |
5f58bd61f1d47a1156ca1080618be812 | 103 738 | 6.2.5 Receive Loudness Level | Requirements Handheld terminal The nominal value of Receive Loudness Level (RLL) shall be 67 ± 4 phon. This value has to be fulfilled for at least one volume setting. Value of RLL at maximum volume setting shall be louder than or equal to 71 phon. Range of volume control (RLL measured at minimum and maximum volume sett... |
5f58bd61f1d47a1156ca1080618be812 | 103 738 | 6.3 Send and receive noise | |
5f58bd61f1d47a1156ca1080618be812 | 103 738 | 6.3.1 Send Noise | Requirement The send noise level shall not exceed -64 dBm0(p). No peaks in the frequency domain higher than 10 dB above the average noise spectrum shall occur. Requirement as for other tests is identical for all types of terminals. NOTE: Softphones with cooling devices (fans) can produce a rather high level of noise, f... |
5f58bd61f1d47a1156ca1080618be812 | 103 738 | 6.3.2 Receive Noise | Requirements The receive noise level shall not exceed -54 dBPa(A) at nominal setting of the volume control. The level in any 1/3rd octave band, between 100 Hz and 10 kHz shall not exceed a value of -64 dBPa. No peaks in the frequency domain higher than 10 dB above the average noise spectrum shall occur. NOTE 1: For sof... |
5f58bd61f1d47a1156ca1080618be812 | 103 738 | 6.4 Send and receive distortion | |
5f58bd61f1d47a1156ca1080618be812 | 103 738 | 6.4.0 General | It is not intended to provide codec-dependant requirements but to assess the electro acoustic performances of the terminal. |
5f58bd61f1d47a1156ca1080618be812 | 103 738 | 6.4.1 Send distortion | Requirement The ratio of signal to harmonic distortion shall be above the following mask. Table 6.4.1-1: Limits for harmonic distortion ratio for send Frequency (Hz) Signal to harmonic distortion ratio limit, send (dB) 315 26 400 30 1 000 30 NOTE: The limits for intermediate frequencies lie on straight lines drawn betw... |
5f58bd61f1d47a1156ca1080618be812 | 103 738 | 6.4.2 Receive distortion | Requirement Handheld terminal The ratio of signal to harmonic distortion shall be above the following mask. Table 6.4.2-1: Limits for harmonic distortion ratio for receive Frequency Signal to distortion ratio limit, receive for vehicle mounted or desktop terminal at nominal volume Signal to distortion ratio limit, rece... |
5f58bd61f1d47a1156ca1080618be812 | 103 738 | 6.5 Terminal Coupling Loss weighted (TCLw) | Requirement In order to meet talker echo objective requirements, the recommended weighted terminal coupling loss during single talk (TCLw) should be greater than 55 dB at nominal setting of volume control. The weighted Terminal Coupling loss TCLw shall be ≥46 dB for all volume settings (if supplied). NOTE 1: A TCLw ≥ 5... |
5f58bd61f1d47a1156ca1080618be812 | 103 738 | 6.6 Stability Loss (or similar parameters) | Requirement For the calculation the averaged measured echo level at each frequency band is referred to the averaged test signal level measured in each frequency band. The attenuation shall exceed 6 dB for all frequencies and for all settings of volume control. Measurement method Test set-up is identical as for TCLw as ... |
5f58bd61f1d47a1156ca1080618be812 | 103 738 | 6.7 Double talk performance | |
5f58bd61f1d47a1156ca1080618be812 | 103 738 | 6.7.0 General | During double talk the speech is mainly determined by 2 parameters: impairment caused by echo during double talk and level variation between single and double talk (attenuation range). In order to guarantee sufficient quality under double talk conditions the Talker Echo Loudness Rating should be high and the attenuatio... |
5f58bd61f1d47a1156ca1080618be812 | 103 738 | 6.7.1 Attenuation Range in Send Direction during Double Talk AH,S,dt | Requirement Based on the level variation in send direction during double talk AH,S,dt the behaviour of the terminal can be classified according to table 6.7.1-1. The terminal should have full duplex capability (category 1). For desktop type terminals, category 1 shall be achieved. For handheld type terminals, category ... |
5f58bd61f1d47a1156ca1080618be812 | 103 738 | 6.7.2 Attenuation Range in Receive Direction during Double Talk AH,R,dt | Requirement Based on the level variation in receive direction during double talk AH,R,dt the behaviour of the terminal can be classified according to table 6.7.2-1. The terminal shall have full duplex capability (category 1). Table 6.7.2-1: Double talk categories for receive direction Category (according to Recommendat... |
5f58bd61f1d47a1156ca1080618be812 | 103 738 | 6.7.3 Detection of echo components during double Talk | Requirement "Echo Loss" (EL) is the echo suppression provided by the terminal measured at the electrical reference point. Table 6.7.3-1: Echo loss during double talk categories Category (according to Recommendation ITU-T P.340 [12]) 1 2a 2b 2c 3 Full Duplex Capability Partial Duplex Capability No Duplex Capability Echo... |
5f58bd61f1d47a1156ca1080618be812 | 103 738 | 6.7.4 Minimum activation level and sensitivity of double talk detection | For further study. |
5f58bd61f1d47a1156ca1080618be812 | 103 738 | 6.8 Switching parameters | |
5f58bd61f1d47a1156ca1080618be812 | 103 738 | 6.8.0 Overview | Additional requirements may be needed in order to further investigate the effect of NLP implementations on the users' perception of speech quality. |
5f58bd61f1d47a1156ca1080618be812 | 103 738 | 6.8.1 Activation in Send Direction | The activation in send direction is mainly determined by the built-up time Tr,S,min and the minimum activation level (LS,min). The minimum activation level is the level required to remove the inserted attenuation in send direction during idle mode. The built-up time is determined for the test signal burst which is appl... |
5f58bd61f1d47a1156ca1080618be812 | 103 738 | 6.8.2 Minimum activation level and sensitivity in Receive direction | For further study. |
5f58bd61f1d47a1156ca1080618be812 | 103 738 | 6.8.3 Automatic level control | For further study. |
5f58bd61f1d47a1156ca1080618be812 | 103 738 | 6.8.4 Silence Suppression and Comfort Noise Generation | For further study. |
5f58bd61f1d47a1156ca1080618be812 | 103 738 | 6.9 Background noise performance | |
5f58bd61f1d47a1156ca1080618be812 | 103 738 | 6.9.1 Performance in send direction in the presence of background noise | Requirement The level of comfort noise, if implemented, shall be within in a range of +2 dB and -5 dB compared to the original (transmitted) background noise. The noise level is calculated with psophometric weighting according to Recommendation ITU-T O.41 [17] in dBm0(p). NOTE 1: It is advisable that the comfort noise ... |
5f58bd61f1d47a1156ca1080618be812 | 103 738 | 6.9.2 Speech Quality in the Presence of Background Noise | Requirement Speech Quality for narrowband systems shall be tested based on ETSI TS 103 106 [21]. The test method leads to three MOS-LQO quality numbers: • N-MOS-LQOn: Transmission quality of the background noise. • S-MOS-LQOn: Transmission quality of the speech. • G-MOS-LQOn: Overall transmission quality. For the backg... |
5f58bd61f1d47a1156ca1080618be812 | 103 738 | 6.9.3 Quality of Background Noise Transmission (with Far End Speech) | Requirement The test is carried out applying a speech signal in receive direction and by comparing the noise level transmitted in the send direction under reference conditions with no far end speech, to the noise level transmitted in the send direction under test conditions including far end speech. During and after th... |
5f58bd61f1d47a1156ca1080618be812 | 103 738 | 6.10 Quality of echo cancellation | |
5f58bd61f1d47a1156ca1080618be812 | 103 738 | 6.10.1 Temporal echo effects | Requirement This test is intended to verify that the system will maintain sufficient echo attenuation during single talk. The measured echo attenuation during single talk shall not decrease by more than 6 dB from the maximum echo attenuation measured. Measurement method The terminal is set up as described in clause 5.2... |
5f58bd61f1d47a1156ca1080618be812 | 103 738 | 6.10.2 Spectral Echo Attenuation | Requirement The echo attenuation vs. frequency shall be below the tolerance mask given in table 6.10.2-1. Table 6.10.2-1: Spectral Echo Loss Limits Frequency Limit 100 Hz -20 dB 200 Hz -30 dB 300 Hz -38 dB 800 Hz -34 dB 1 500 Hz -33 dB 2 600 Hz -24 dB 4 000 Hz -24 dB NOTE 1: All sensitivity values are expressed in dB o... |
5f58bd61f1d47a1156ca1080618be812 | 103 738 | 6.10.3 Occurrence of Artefacts | For further study. |
5f58bd61f1d47a1156ca1080618be812 | 103 738 | 6.10.4 Variable echo path | Requirement This test is intended to verify that the system will maintain sufficient echo attenuation during single talk with dynamic changing echo paths. The measured echo level over time during single talk shall not be more than 10 dB above the minimum noise level during the measurement. Measurement method The test s... |
5f58bd61f1d47a1156ca1080618be812 | 103 738 | 6.11 Send and receive delay - round-trip delay | Requirements Send and receive delays are tested separately but the requirement is defined for the combination of send and receive delays (round-trip delay). It is recognized that the end-to-end delay should be as small as possible in order to ensure high quality of the communication. The round-trip delay of the termina... |
5f58bd61f1d47a1156ca1080618be812 | 103 738 | 6.12 Void | 7 Codec dependent requirements and associated Measurement Methodologies |
5f58bd61f1d47a1156ca1080618be812 | 103 738 | 7.1 Speech Codecs | The present document is intended to be applicable for different speech codecs implemented in access networks. Table 7.1-1 defines a list of speech codecs implemented (non exhaustive). Table 7.1-1: List of speech codecs System Codec GSM 850, 900, 1 800, 1 900 AMR-NB [1] GSM Full Rate Codec [19], Enhanced FullRate [20] U... |
5f58bd61f1d47a1156ca1080618be812 | 103 738 | 7.2 Void | |
5f58bd61f1d47a1156ca1080618be812 | 103 738 | 7.3 Objective listening speech quality | |
5f58bd61f1d47a1156ca1080618be812 | 103 738 | 7.3.0 Overview | The measurements of this clause are only applicable if the terminal supports at least one of the codecs listed in table 7.1-1. ETSI ETSI TS 103 738 V1.4.1 (2021-10) 41 |
5f58bd61f1d47a1156ca1080618be812 | 103 738 | 7.3.1 Objective listening speech quality MOS-LQO in send direction | The listening speech quality tests are conducted without any packet impairments (clean network conditions). Requirements The requirements for the listening speech quality according to table 7.3.1-1 apply. Table 7.3.1-1: Requirements for speech quality in send direction Speech codec MOS-LQON (P.863 or TOSQA 2001) MOS-LQ... |
5f58bd61f1d47a1156ca1080618be812 | 103 738 | 7.3.2 Objective listening quality MOS-LQO in receive direction | |
5f58bd61f1d47a1156ca1080618be812 | 103 738 | 7.3.2.1 Jitter- and Error-Free Condition | The listening speech quality tests are conducted without any packet impairments (clean network conditions). Requirements The requirements for the listening speech quality and the delay under clean network conditions according to table 7.3.2.1-1 apply. ETSI ETSI TS 103 738 V1.4.1 (2021-10) 42 Table 7.3.2.1-1: Requiremen... |
5f58bd61f1d47a1156ca1080618be812 | 103 738 | 7.3.2.2 Packet Impairments | The listening speech quality tests are conducted with simulated packet impairments. In addition to the listening speech quality tests, the delay is measured. The tests of this clause are only applicable to terminals providing an IP-based network access. Requirements The degradation between the error- and jitter-free co... |
40688643e35bc74fd28902572e9b113b | 103 737 | 1 Scope | The present document provides speech transmission performance requirements for wireless terminals; it addresses several types of mobile wireless terminals, including softphones. The present document addresses handset and headset functionality of narrowband wireless terminals. Test methods and performance requirements a... |
40688643e35bc74fd28902572e9b113b | 103 737 | 2 References | |
40688643e35bc74fd28902572e9b113b | 103 737 | 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... |
40688643e35bc74fd28902572e9b113b | 103 737 | 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... |
40688643e35bc74fd28902572e9b113b | 103 737 | 3 Definition of terms, symbols and abbreviations | |
40688643e35bc74fd28902572e9b113b | 103 737 | 3.1 Terms | For the purposes of the present document, the following terms apply: artificial ear: device for the calibration of earphones incorporating an acoustic coupler and a calibrated microphone for the measurement of the sound pressure and having an overall acoustic impedance similar to that of the median adult human ear over... |
40688643e35bc74fd28902572e9b113b | 103 737 | 3.2 Symbols | Void. ETSI ETSI TS 103 737 V1.4.1 (2021-10) 10 |
40688643e35bc74fd28902572e9b113b | 103 737 | 3.3 Abbreviations | For the purposes of the present document, the following abbreviations apply: AM-FM Amplitude Modulation - Frequency Modulation AMR-NB Adaptive Multi-Rate - NarrowBand CS Composite Source CSS Composite Source Signal D D-Value of Terminal DECT Digital Enhanced Cordless Telecommunications DRP ear Drum Reference Point DUT ... |
40688643e35bc74fd28902572e9b113b | 103 737 | 4 Void | |
40688643e35bc74fd28902572e9b113b | 103 737 | 5 Test Configurations | |
40688643e35bc74fd28902572e9b113b | 103 737 | 5.1 Set-up interface | The generic schematic as defined in figure 5.1-1 is applicable to any wireless link. NOTE: The "whole" terminal includes all the components from "RF interface" to the transducers and may include an additional (radio) link. The air interface considered in the figure is not the additional radio link. Figure 5.1-1: Set-up... |
40688643e35bc74fd28902572e9b113b | 103 737 | 5.2 Set-up for terminals | |
40688643e35bc74fd28902572e9b113b | 103 737 | 5.2.0 General | The acoustical access to terminals is the most realistic simulation of the "average" subscriber. This can be made by using HATS (Head And Torso Simulator) with appropriate ear simulation and appropriate means to fix handset and headset terminals in a realistic and reproducible way to the HATS. HATS is described in Reco... |
40688643e35bc74fd28902572e9b113b | 103 737 | 5.2.1 Setup for handsets and headsets | When using a handset telephone the handset is placed in the HATS position as described in Recommendation ITU-T P.64 [5]. The artificial mouth shall be conform with Recommendation ITU-T P.58 [4]. The spectrum of acoustic signal produced by the artificial mouth is calibrated under free field conditions at the MRP. The ar... |
40688643e35bc74fd28902572e9b113b | 103 737 | 5.2.2 Setup of variable echo path | The handset is positioned d = 3 cm above a horizontal hard surface, facing the surface with speaker and microphone. The surface shall be at least 35 × 35 cm. The handset is fixed like a pendulum with a non-elastic cord 3 cm above the centre of the horizontal surface, see figure 5.2.2-1. The pivot is 55 ± 1 cm above the... |
40688643e35bc74fd28902572e9b113b | 103 737 | 5.2.3 Setup for testing positional robustness of handsets | In order to investigate the robustness of certain measurements against non-default positions as described in clause 5.2.1, three modified positions are defined for the send and receive side. Tables 5.2.3-1 and 5.2.3-2 provide a description of these positions, which are derived from typical user behaviour. Figure 5.2.3-... |
40688643e35bc74fd28902572e9b113b | 103 737 | 5.3 Acoustical environment | In general different acoustical environments have to be taken into account: either room noise and background noise are an inherent part of the test environment or room noise and background noise shall be eliminated to such an extent that their influence on the test results can be neglected. Unless stated otherwise, mea... |
40688643e35bc74fd28902572e9b113b | 103 737 | 5.4 Test signals | Modern wireless terminals often deploy nonlinear and time-varying processing. As such terminals are designed for speech transmission, the most appropriate test signal is real speech. Appropriate test signals (general description) are defined in Recommendation ITU-T P.501 [10]. For testing the narrowband telephony servi... |
40688643e35bc74fd28902572e9b113b | 103 737 | 5.5 Calibration | |
40688643e35bc74fd28902572e9b113b | 103 737 | 5.5.1 Position and calibration of HATS | All the send and receive characteristics shall be tested with the HATS, it shall be indicated what type of ear was used at what application force. The various steps for calibration of the artificial mouth are described in Recommendation ITU-T P.581 [12]. The spectrum of acoustic signal produced by the artificial mouth ... |
40688643e35bc74fd28902572e9b113b | 103 737 | 5.5.2 Setup of background noise simulation | A setup for simulating realistic background noises in a lab-type environment is described in ETSI TS 103 224 [26]. ETSI TS 103 224 [26] contains a description of the recording arrangement for realistic background noises, a description of the setup for a loudspeaker arrangement suitable to simulate a background noise fi... |
40688643e35bc74fd28902572e9b113b | 103 737 | 5.6 Environmental conditions for tests | The following conditions shall apply for the testing environment: a) Ambient temperature: 15 °C to 35 °C (inclusive); b) Relative humidity: 5 % to 85 %; c) Air pressure: 86 kPa to 106 kPa (860 mbar to 1 060 mbar). |
40688643e35bc74fd28902572e9b113b | 103 737 | 5.7 Accuracy of test equipment | Unless specified otherwise, the accuracy of measurements made by test equipment shall be better than: Table 5.7-1: Accuracy of measurements Item Accuracy Electrical Signal Level Electrical Signal Level Sound pressure Time Frequency Application force Measured maximum frequency Clock Accuracy ±0,2 dB for levels ≥ -50 dBV... |
40688643e35bc74fd28902572e9b113b | 103 737 | 5.8 Power feeding conditions | For terminal equipment, which is directly powered from the mains supply, all tests shall be carried out within ±5 % of the rated voltage of that supply. If the equipment is powered by other means and those means are not supplied as part of the apparatus, all tests shall be carried out within the power supply limit decl... |
40688643e35bc74fd28902572e9b113b | 103 737 | 5.9 Influence of terminal delay on measurements | As delay is introduced by the terminal, care shall be taken for all measurements where exact position of the analysis window is required. It shall be checked that the test is performed on the test signal and not any other signal. ETSI ETSI TS 103 737 V1.4.1 (2021-10) 18 6 Codec independent requirements and associated M... |
40688643e35bc74fd28902572e9b113b | 103 737 | 6.1 Send and receive frequency response | |
40688643e35bc74fd28902572e9b113b | 103 737 | 6.1.1 Send frequency response | Due to diffuse field equalization applied in the receive direction, a flat frequency response is preferable in send path. Requirement The send frequency response of the handset or the headset shall be within a mask as defined in table 6.1.1-1 and shown in figure 6.1.1-1. This mask shall be applicable for all types of h... |
40688643e35bc74fd28902572e9b113b | 103 737 | 6.1.2 Receive frequency response | Requirement The receive frequency response of the handset or the headset shall be within a mask as defined in table 6.1.2-1 and shown in figures 6.1.2-1 to 6.1.2-3. The application force for handsets is 2N, 8N and 13N. The mask defined for 8N application force shall be applicable for all types of headsets. Table 6.1.2-... |
40688643e35bc74fd28902572e9b113b | 103 737 | 6.1.3 Positional Robustness of Frequency Response | |
40688643e35bc74fd28902572e9b113b | 103 737 | 6.1.3.1 Send | Requirement For each of the modified handset positions, the send frequency response shall be within a given mask. The mask values per frequency are identical to table 6.1.1-1, except that an additional tolerance is provided for certain positions. Table 6.1.3-1 provides the requirements on the lower limits per position.... |
40688643e35bc74fd28902572e9b113b | 103 737 | 6.1.3.2 Receive | Requirement For each of the modified handset positions, the send frequency response shall be within a given mask. The mask values per frequency are identical to table 6.1.2-1, except that an additional tolerance is provided for certain positions. Table 6.1.3-2 provides the requirements on the lower limits per position.... |
40688643e35bc74fd28902572e9b113b | 103 737 | 6.2 Send and receive loudness ratings | |
40688643e35bc74fd28902572e9b113b | 103 737 | 6.2.1 Send Loudness Rating (SLR) | Requirement The nominal value of Send Loudness Rating (SLR) shall be: SLR = +8 dB ± 3 dB (2) Measurement method The test signal to be used for the measurements shall be the British-English single talk sequence described in clause 7.3.2 of Recommendation ITU-T P.501 [10]. The handset or headset terminal is set up as des... |
40688643e35bc74fd28902572e9b113b | 103 737 | 6.2.2 Microphone (Mic) mute | Requirement The SLR (Send Loudness Rating) with mic mute on shall be at least 50 dB higher than with mic mute off. Measurement method The handset terminal or the headset terminal is set up as described in clause 6.2.1, but its microphone shall be configured to be muted. Measurement and calculation method are the same a... |
40688643e35bc74fd28902572e9b113b | 103 737 | 6.2.3 Receive Loudness Rating (RLR) | Requirement The nominal value of Receive Loudness Rating (RLR) for handset and monaural headset shall be: RLR = +2 dB ± 3 dB (3) Where a user controlled receive volume control is provided, the RLR shall meet the selected nominal value for at least one setting of the control. When the control is set to maximum, the RLR ... |
40688643e35bc74fd28902572e9b113b | 103 737 | 6.2.4 Positional Robustness of LR | |
40688643e35bc74fd28902572e9b113b | 103 737 | 6.2.4.1 SLR | Requirement The difference (in dB) between the SLR measured in each of the three modified handset positions and the one in determined standard position (STD) shall be in the range of -3 to +3 dB. Measurement method In addition to the test setup and measurement of clause 6.2.1, each of the three modified handset positio... |
40688643e35bc74fd28902572e9b113b | 103 737 | 6.2.4.2 RLR | Requirement The difference (in dB) between the RLR measured in each of the three modified handset positions and the one in standard position (STD) shall be in the range -3 to +3 dB. Measurement method In addition to the test setup and measurement of clause 6.2.3, each of the three modified handset positions for receive... |
40688643e35bc74fd28902572e9b113b | 103 737 | 6.2.5 Send Loudness Level | Requirements The nominal value of Send Loudness Level (SLL) shall be: SLL = 75 phon ± 4 phon Measurement method The test signal to be used for the measurements shall be the British-English single talk sequence described in clause 7.3.2 of Recommendation ITU-T P.501 [10]. The handset or headset terminal is set up as des... |
40688643e35bc74fd28902572e9b113b | 103 737 | 6.2.6 Receive Loudness Level | Requirements The nominal value of Receive Loudness Level (RLL) for handsets, monaural and binaural/stereo headsets shall be: RLL = 75 phon ± 4 phon In case a user controlled receive volume control is provided, for at least one setting of the control the RLL shall meet the nominal value. When the control is set to maxim... |
40688643e35bc74fd28902572e9b113b | 103 737 | 6.3 Sidetone parameters | |
40688643e35bc74fd28902572e9b113b | 103 737 | 6.3.0 Overview | The present document covers different types of terminals and different use cases (including noisy environments). STMR requirements are basically defined when using terminals in low noise environments. |
40688643e35bc74fd28902572e9b113b | 103 737 | 6.3.1 SideTone Masking Rating (STMR) | Requirement The SideTone Masking Rating STMR shall be 16 dB ± 4 dB for nominal setting of the volume control. For all other positions of the volume control, the STMR shall not be below 8 dB. NOTE: It is preferable to have a constant STMR independent of the volume control setting. Measurement method The test signal to b... |
40688643e35bc74fd28902572e9b113b | 103 737 | 6.3.2 Sidetone delay | Requirement The maximum sidetone-round-trip delay shall be ≤ 5 ms, measured in an echo-free setup. ETSI ETSI TS 103 737 V1.4.1 (2021-10) 26 Measurement method The handset or headset terminal is set up as described in clause 5.2. The handset is mounted in the standard position of the HATS. The test signal is a CS-signal... |
40688643e35bc74fd28902572e9b113b | 103 737 | 6.4 Send and receive noise | |
40688643e35bc74fd28902572e9b113b | 103 737 | 6.4.1 Send noise | Requirement The maximum noise level produced by the Wireless terminal at the POI under silent conditions in the send direction shall not exceed -64 dBm0(p). No peaks in the frequency domain higher than 10 dB above the average noise spectrum shall occur. Measurement method For the actual measurement no test signal is us... |
40688643e35bc74fd28902572e9b113b | 103 737 | 6.4.2 Receive noise | Requirement Telephone sets with adjustable receive levels shall be adjusted so that the RLR is as close as possible to the nominal RLR. The receive noise shall be less than -57 dBPa(A). Where a volume control is provided, the measured noise shall not be greater than -54 dBPa(A) at the maximum setting of the volume cont... |
40688643e35bc74fd28902572e9b113b | 103 737 | 6.5 Send and receive distortion | |
40688643e35bc74fd28902572e9b113b | 103 737 | 6.5.0 Overview | The send and receive distortions aim to qualify the harmonic distortion for different signal frequencies. It is not intended to provide codec-dependant requirements but to assess the electroacoustic performance of the terminal. |
40688643e35bc74fd28902572e9b113b | 103 737 | 6.5.1 Send Distortion | Requirement The ratio of signal to harmonic distortion shall be above the following mask. ETSI ETSI TS 103 737 V1.4.1 (2021-10) 28 Table 6.5.1-1 Frequency (Hz) Signal to harmonic distortion ratio limit, send (dB) 315 26 400 30 1 000 30 NOTE: The limits for intermediate frequencies lie on straight lines drawn between th... |
40688643e35bc74fd28902572e9b113b | 103 737 | 6.5.2 Receive distortion | Requirement The ratio of signal to harmonic distortion shall be above the following mask. Table 6.5.2-1 Frequency (Hz) Signal to distortion ratio limit, receive (dB) 315 20 400 26 500 30 1 000 30 Measurement method The handset terminal or the headset terminal is set up as described in clause 5.2. The handset is mounted... |
40688643e35bc74fd28902572e9b113b | 103 737 | 6.6 Stability loss and TCLw | |
40688643e35bc74fd28902572e9b113b | 103 737 | 6.6.1 Stability loss | Requirement With the handset lying on and the transducers facing a hard surface, the attenuation from the digital input to the digital output shall be at least 6 dB at all frequencies in the range of 200 Hz to 4 kHz. In case of headsets the requirement applies for the closest possible position between microphone and he... |
40688643e35bc74fd28902572e9b113b | 103 737 | 6.6.2 Terminal Coupling Loss weighted (TCLw) | Requirement In order to meet talker echo objective requirements, the recommended weighted terminal coupling loss during single talk (TCLw) should be greater than 55 dB at nominal setting of the volume control. The TCLw shall be ≥ 46 dB for all settings of the volume control (if supplied). NOTE 1: A TCLw ≥ 55 dB is reco... |
40688643e35bc74fd28902572e9b113b | 103 737 | 6.7 Double talk performance | |
40688643e35bc74fd28902572e9b113b | 103 737 | 6.7.0 Overview | During double talk the speech is mainly determined by 2 parameters: impairment caused by echo during double talk and level variation between single and double talk (attenuation range). In order to guarantee sufficient quality under double talk conditions the Talker Echo Loudness Rating should be high and the attenuatio... |
40688643e35bc74fd28902572e9b113b | 103 737 | 6.7.1 Attenuation Range in Send Direction during Double Talk AH,S,dt | Requirement Based on the level variation in send direction during double talk AH,S,dt the behaviour of the terminal can be classified according to table 6.7.1-1. Table 6.7.1-1: Double talk categories for send direction Category (according to Recommendation ITU-T P.340 [8]) 1 2a 2b 2c 3 Full Duplex Capability Partial Du... |
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