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51.010-1
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30.4 Receiving loudness rating
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51.010-1
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30.4.1 Definition
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The Receiving Loudness Rating (RLR) is a means of expressing the receiving frequency response based on objective measurements in a way which relates to how a speech signal would be perceived by a listener.
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30.4.2 Conformance requirement
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1) The nominal Receiving Loudness Rating (RLR) shall be 2 ± 3 dB.
If a user controlled receive volume control is provided the equipment shall meet this nominal value for at least one setting of the control.
3GPP TS 03.50; subclause 3.1.1.
2) If a user controlled receive volume control is provided the Receive Loudness Rating (RLR) shall not be less than ‑13 dB when the control is set to maximum.
3GPP TS 03.50; subclause 3.1.1.
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30.4.3 Test purpose
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1) To verify that the nominal Receiving Loudness Rating (RLR) is 2 ± 3 dB.
2) To verify that if a user controlled receive volume control is provided the Receive Loudness Rating (RLR) is not less than ‑13 dB when the control is set to maximum.
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30.4.4 Method of test
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51.010-1
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30.4.4.1 Initial conditions
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When measured at the DAI:
- The DAI of the MS is connected to the SS and is set to the operating mode "Test of acoustic devices and A/D & D/A".
When measured at the output of the reference speech decoder of the SS:
- A full rate speech call is set up between the MS and the SS.
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51.010-1
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30.4.4.2 Procedure
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When measured at the DAI:
a) The receiving sensitivity is measured at each of the 14 frequencies listed in table 2 of ITU-T Recommendation P.79, bands 4 to 17.
b) The sensitivity is expressed in terms of dBPa/V and the RLR is calculated according to ITU-T Recommendation P.79 formula 4.19 c, over bands 4 to 17, using the receiving weighting factors from table 2 of ITU-T Recommendation P.79, adjusted according to table 3 of ITU-T Recommendation P.79.
c) The artificial ear sensitivity must be corrected according to the real ear correction of table 4 of ITU-T Recommendation P.79.
NOTE: The values of real ear correction in ITU-T Recommendation P.79 table 4 were derived for one type of handset conforming to the shape defined in ITU-T Recommendation P.35.
These values are used in the present document because there is no measurement method agreed for the real ear correction. If a method of measurement is agreed, it is intended to change the present document to use the values appropriate to each handset.
When measured from the input of the reference speech encoder of the SS:
a) The receiving sensitivity from the analogue or digital input of the reference speech encoder of the SS to the output of the artificial ear is determined according to subclauses 30.3.4.1 and 30.3.4.2.
b) The sensitivity is expressed in terms of dBPa/V and the RLR shall be calculated according to ITU‑T Recommendation P.79 formula 2.1, over bands 4 to 17, using m = 0,175 and the receiving weighting factors from table 1 of ITU‑T Recommendation P.79.
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51.010-1
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30.4.5 Test requirement
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If no user controlled receive volume control is provided, the RLR shall be 2 ± 3 dB.
If a user controlled receive volume control is provided, the RLR shall meet this nominal value for (at least) one setting of the receive volume control.
When the receive volume control is set to maximum the RLR shall not be less than (i.e. louder than) ‑13 dB.
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51.010-1
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30.5 Side tones
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30.5.1 Side Tone Masking Rating (STMR)
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51.010-1
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30.5.1.1 Definition
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The sidetone loudness ratings are a means of expressing the path loss from the artificial mouth to the artificial ear based on objective single tone measurements in a way that relates to how a speaker will perceive his own voice when speaking (talker sidetone, expressed by the sidetone masking rating - STMR), or how a listener will perceive the background noise picked up by the microphone (listener sidetone rating - LSTR).
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30.5.1.2 Conformance requirement
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The nominal value of the Side Tone Masking Rating (STMR) shall be 13 ± 5 dB. Where a user controlled receiving volume control is provided the STMR shall meet the requirement at the setting where the RLR is equal to the nominal value.
3GPP TS 03.50; subclause 3.10.1.
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51.010-1
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30.5.1.3 Test purpose
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1) To verify that the Side Tone Masking Rating (STMR) is 13 ± 5 dB.
2) To verify that is a user controlled receiving volume control is provided, the STMR is 13 ± 5 dB at the setting where the RLR is equal to the nominal value.
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51.010-1
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30.5.1.4 Method of test
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51.010-1
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30.5.1.4.1 Initial conditions
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a) The DAI of the MS is connected to the SS and is set to the operating mode "Test of acoustic devices and A/D & D/A".
b) The handset is mounted in the LRGP (see annex 1 of ITU-T Recommendation P.76) and the earpiece is sealed to the knife-edge of the artificial ear conforming to ITU-T Recommendation P.51.
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30.5.1.4.2 Procedure
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a) The SS sends a PCM bit stream coded with the value No 1 over the DAI (pin 25). Or alternatively the activation of the A/D and D/A converters is performed via a call setup, in which case the DAI connection between the MS and SS, and the PCM bit stream are optional.
NOTE: The idle channel noise in the receiving direction is the acoustic sound pressure in the artificial ear when the digital input signal at the DAI is the PCM coded value No. 1.
b) The SS applies a pure tone with a sound pressure of ‑4,7 dBPa at the mouth reference point as described in ITU-T P.64 using an artificial mouth conforming to ITU-T Recommendation P 51.
c) For each frequency given in table 2 of ITU-T Recommendation P.79, bands 4 to 17, the sound pressure in the artificial ear is measured.
d) The sidetone path loss (LmeST) is expressed in dB and the STMR (in dB) is calculated from the formula 8.4 of ITU-T Recommendation P.79, using the weighting factors of column (3) in table 6 of ITU-T Recommendation P.79 (unsealed), and values of LE in accordance with table 4 of ITU-T Recommendation P.79.
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51.010-1
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30.5.1.5 Test requirement
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The STMR shall be 13 ± 5 dB.
Where a user controlled receive volume control is provided, the STMR shall meet the requirement given above at the setting where the RLR is equal to the nominal value.
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51.010-1
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30.5.2 Listener Side Tone Rating (LSTR)
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51.010-1
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30.5.2.1 Definition
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The Listener Sidetone Rating (LSTR) is considered a major parameter affecting the user perception of the system.
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51.010-1
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30.5.2.2 Conformance requirement
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The value of the Listener Sidetone Rating (LSTR) shall not be less than 15 dB.
3GPP TS 03.50, subclause 3.10.1.
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51.010-1
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30.5.2.3 Test purpose
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To verify that the value of LSTR is not less than 15 dB.
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51.010-1
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30.5.2.4 Method of test
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51.010-1
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30.5.2.4.1 Initial conditions
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The DAI of the MS is connected to the SS and is set to the operating mode "Test of acoustic devices and A/D & D/A".
The SS sends a PCM bit stream coded with the value No. 1 over the DAI (pin 25) to the MS.
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51.010-1
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30.5.2.4.2 Procedure
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a) The sound field is calibrated in the absence of any local obstacles. The averaged field shall be uniform to within +4 dB/‑2 dB within a radius of 0,15 m of the MRP, when measured in one-third octave bands from 100 Hz to 8 kHz (bands 1 to 20).
b) A calibrated half-inch microphone is mounted at MRP. The sound field is measured in one-third octave bands. The spectrum shall be "Pink noise" as described in ITU-T recommendation P.64 annex B to within ±1 dB and the level shall be adjusted to 70 dBA (-24 dBPa(A)). The tolerance on this level is ±1 dB.
c) The artificial mouth and ear are placed in the correct position relative to MRP, the handset is mounted at LRGP and the earpiece is sealed to the knife-edge of the artificial ear.
d) Measurements are made in one-third octave bands for the 14 bands centred at 200 Hz to 4 kHz (bands 4 to 17). For each band the sound pressure in the artificial ear shall be measured by connecting a suitable measuring set to the artificial ear.
e) The listener sidetone path loss is expressed in dB and the LSTR shall be calculated from the ITU-T Recommendation P.79 formula 8‑4, using the weighting factors in column (3) in table 6 of the Recommendation, and the values of LE; in accordance with table 4 of the Recommendation.
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51.010-1
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30.5.2.5 Test requirement
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The LSTR shall not be less than 15 dB.
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51.010-1
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30.6 Telephone Acoustic coupling Loss (TAL)
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51.010-1
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30.6.1 Echo Loss (EL)
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51.010-1
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30.6.1.1 Definition
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The echo loss is the path loss from the input of the reference speech encoder of the SS to the output of the reference speech decoder of the SS.
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51.010-1
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30.6.1.2 Conformance requirement
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The echo loss from the input to the output of the reference speech codec in the SS shall be at least 46 dB.
3GPP TS 03.50; subclause 3.4.3.2.
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51.010-1
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30.6.1.3 Test purpose
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To verify that the echo loss from the input to the output of the reference speech codec in the SS is at least 46 dB.
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51.010-1
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30.6.1.4 Method of test
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51.010-1
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30.6.1.4.1 Initial conditions
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The DAI of the MS is connected to the SS and is set to the operating mode "Normal operation".
The SS sets up a speech call according to the generic call set up procedure.
The handset is mounted in the LRGP (see annex 1 of ITU-T Recommendation P.76) and the earpiece is sealed to the knife-edge of the artificial ear conforming to ITU-T Recommendation P.51.
Where a user controlled volume control is provided it is set to maximum.
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51.010-1
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30.6.1.4.2 Procedure
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An implementation of the ITU-T P.50 artificial speech is connected to the analogue or digital input of the reference speech encoder of the SS. This implementation is either a real time algorithm producing the artificial speech or a pre-recorded tape of artificial speech. Both "male" and "female" artificial speech is required.
A ten second segment of the "male" artificial speech is applied to the analogue or digital input of the reference speech encoder of the SS. The third octave power of the input signal is measured. The echo loss signal is not measured at this stage as the first ten second segment is used to allow any acoustic echo cancellation devices within the MS to adapt to the echo path.
Immediately after a second ten second segment of the "male" artificial speech is applied to the analogue or digital input of the reference speech encoder of the SS. The third octave power of the echo signal is measured at the analogue or digital output of the reference speech decoder of the SS.
The difference between the third octave input power and the third octave output power is entered into the ITU-T G.122 TCL algorithm and the acoustic echo loss calculated.
The test is repeated with the "female" artificial speech and the results of both "male" and "female" averaged to give the final result.
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51.010-1
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30.6.1.5 Test requirement
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The echo loss from the input to the output of the reference speech codec in the SS shall be at least 46 dB.
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51.010-1
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30.6.2 Stability margin
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51.010-1
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30.6.2.1 Definition
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The receive-transmit stability margin is a measure of the gain that would have to be inserted between the go and return paths of the reference speech coder in the SS for oscillation to occur.
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51.010-1
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30.6.2.2 Conformance requirement
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The stability margin shall be at least 6 dB.
3GPP TS 03.50; subclause 3.2.
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51.010-1
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30.6.2.3 Test purpose
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To verify that the stability margin is at least 6 dB.
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51.010-1
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30.6.2.4 Method of test
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51.010-1
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30.6.2.4.1 Initial conditions
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For handset operation the handset is placed on a hard plane surface with the transducers facing the surface.
For hands free operation the test setup is shown in ITU-T Recommendation P.34 (figure 3), but omitting the test table.
Where a user controlled volume control is provided it is set to maximum.
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51.010-1
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30.6.2.4.2 Procedure
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a) A gain equivalent to the minimum stability margin is inserted in the loop between the go and return paths of the reference speech coder in the SS and any acoustic echo control is enabled.
b) A test signal according to ITU-T Recommendation O.131 is injected into the loop at the analogue or digital input of the reference speech codec of the SS and the stability is measured. The test signal has a level of ‑10 dBm0 and a duration of 1 s.
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51.010-1
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30.6.2.5 Test requirement
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The minimum stability margin shall be 6 dB and no audible oscillation shall be detected.
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51.010-1
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30.7 Distortion
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51.010-1
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30.7.1 Sending
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51.010-1
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30.7.1.1 Definition
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The transmit signal to total distortion ratio is a measure of the linearity of the transmitter equipment.
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51.010-1
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30.7.1.2 Conformance requirement
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The ratio of signal to total distortion power in the sending direction measured with a psophometric filter at the DAI of the MS or at the output of the reference speech decoder of the SS shall be above the limits given in 3GPP TS 03.50; subclause 3.9.1, table 3, unless the sound pressure at MRP exceeds +10 dBPa.
3GPP TS 03.50; subclause 3.9.1.
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51.010-1
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30.7.1.3 Test purpose
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To verify that the ratio of signal to total distortion power in the sending direction measured with psophometric filter is above the limits given in 3GPP TS 03.50;subclause 3.9.1, table 3.
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51.010-1
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30.7.1.4 Method of test
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51.010-1
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30.7.1.4.1 Initial conditions
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The handset is mounted in the LRGP (see annex 1 of ITU-T Recommendation P.76) and the earpiece is sealed to the knife-edge of the artificial ear conforming to ITU-T Recommendation P.51.
When measured at the DAI:
The DAI of the MS is connected to the SS and is set to the operating mode "Test of acoustic devices and A/D & D/A".
When measured at the output of the reference speech decoder of the SS:
A full rate speech call is set up between the MS and the SS.
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683b5b8a98f7b1390ddd5516ea9247a2
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51.010-1
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30.7.1.4.2 Procedure
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a) A sine-wave signal with a frequency in the range 1 004 Hz to 1 025 Hz is applied to the MRP. The level of this signal is adjusted until the level at the DAI output (pin 23) of the MS or at the analogue or digital output of the reference speech decoder of the SS corresponds to ‑10 dBm0. The level of the signal at the MRP is then the acoustic reference level (ARL).
b) The test signal is applied at the following levels: ‑35 dB, ‑30 dB, ‑25 dB, ‑20 dB, ‑15 dB, ‑10 dB, ‑5 dB, 0 dB, 5 dB, 10 dB relative to the ARL.
c) The ratio of signal to total distortion power is measured at the DAI of the MS or at the analogue or digital output of the reference speech decoder of the SS with the psophometric noise weighting (see ITU-T Recommendations G.714 and O.132) at each signal level.
NOTE: The measurement is not to be carried out at sound pressures exceeding +10 dBPa.
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51.010-1
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30.7.1.5 Test requirement
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The ratio of signal to total distortion power measured with the psophometric noise weighting (see table 4/ ITU-T G.223) shall be above the limits given in table 30.3.
Table 30.3
dB relative to ARL
Level ratio
‑35 dB
17,5 dB
‑30 dB
22,5 dB
‑20 dB
30,7 dB
‑10 dB
33,3 dB
0 dB
33,7 dB
7 dB
31,7 dB
10 dB
25,5 dB
Limits for the signal to total distortion ratio (sending) when using the sine wave method.
Limits for intermediate levels are found by drawing a straight line between breaking points in a linear (dB signal level) vs linear (dB ratio) scale.
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51.010-1
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30.7.2 Receiving
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51.010-1
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30.7.2.1 Definition
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The receive signal to total distortion ratio is a measure of the linearity in the receive equipment (excluding the speech decoder).
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51.010-1
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30.7.2.2 Conformance requirement
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The ratio of signal to total distortion power in the receiving direction measured at the ERP or DRP according to the Terminal Supplier's request with psophometric filter shall be above the limits given in 3GPP TS 03.50; subclause 3.9.2, table 5.
3GPP TS 03.50; subclause 3.9.2.
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51.010-1
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30.7.2.3 Test purpose
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To verify that the ratio of signal to total distortion power in the receiving direction measured at the ERP or DRP according to the Terminal Supplier's request with psophometric filter is above the limits given in 3GPP TS 03.50; subclause 3.9.2, table 5.
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683b5b8a98f7b1390ddd5516ea9247a2
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51.010-1
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30.7.2.4 Method of test
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683b5b8a98f7b1390ddd5516ea9247a2
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51.010-1
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30.7.2.4.1 Initial conditions
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The handset is mounted in the LRGP (see annex 1 of ITU-T Recommendation P.76) and the earpiece is sealed to the knife-edge of the artificial ear conforming to ITU-T Recommendation P.51.
The DAI of the MS is connected to the SS and is set to the operating mode "Test of acoustic devices and A/D & D/A".
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683b5b8a98f7b1390ddd5516ea9247a2
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51.010-1
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30.7.2.4.2 Procedure
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a) The SS sends, via the DAI (Pin 25), a PCM bit stream simulating a sine-wave signal with a frequency in the range 1 004 Hz to 1 025 Hz corresponding to ITU-T O.132 at the following levels: ‑45 dBm0, ‑40 dBm0, ‑35 dBm0, ‑30 dBm0, ‑25 dBm0, ‑20 dBm0, ‑15 dBm0, ‑10 dBm0, ‑5 dBm0, 0 dBm0.
b) The ratio of signal to total distortion power is measured with the psophometric noise weighting in the artificial ear (see ITU-T Recommendations G.714 and O.132) at each signal level.
c) The measurement is only carried out at sound pressures between ‑50 dBPa and +10 dBPa.
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51.010-1
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30.7.2.5 Test requirement
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The ratio of signal to total distortion power measured at the artificial ear with the psophometric noise weighting (see table 4/ ITU-T Recommendation G.223) shall be above the limits given in table 30.4.
Table 30.4
Level at the digital audio interface
Level ratio
‑45 dBm0
17,5 dB
‑40 dBm0
22,5 dB
‑30 dBm0
30,5 dB
‑20 dBm0
33,0 dB
‑10 dBm0
33,5 dB
‑3 dBm0
31,2 dB
0 dBm0
25,5 dB
Limits for the signal to total distortion ratio (receiving) when using the sine wave method.
Limits for intermediate levels are found by drawing a straight line between breaking points in a linear (dB signal level) vs linear (dB ratio) scale.
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51.010-1
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30.8 Sidetone distortion
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51.010-1
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30.8.1 Definition
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The sidetone distortion expresses the linearity of the sidetone path in the handset.
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683b5b8a98f7b1390ddd5516ea9247a2
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51.010-1
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30.8.2 Conformance requirement
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The third harmonic distortion of the sidetone shall not be greater than 10 %.
3GPP TS 03.50; subclause 3.10.2.
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683b5b8a98f7b1390ddd5516ea9247a2
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51.010-1
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30.8.3 Test purpose
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To verify that the third harmonic distortion of the sidetone is not greater than 10 %.
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683b5b8a98f7b1390ddd5516ea9247a2
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51.010-1
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30.8.4 Method of test
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683b5b8a98f7b1390ddd5516ea9247a2
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51.010-1
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30.8.4.1 Initial conditions
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The DAI of the MS is connected to the SS and is set to the operating mode "Test of acoustic devices and A/D & D/A".
The handset is mounted in the LRGP (see annex 1 of ITU-T Recommendation P.76) and the earpiece is sealed to the knife-edge of the artificial ear conforming to ITU-T Recommendation P.51.
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683b5b8a98f7b1390ddd5516ea9247a2
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51.010-1
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30.8.4.2 Procedure
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a) The SS sends the PCM bit stream coded with the value No 1 over the DAI (pin 25) to the MS.
b) An instrument capable of measuring the third harmonic distortion of signals with fundamental frequencies in the range 315 Hz to 1 000 Hz is connected to the artificial ear.
c) A pure-tone signal of ‑4,7 dBPa is applied at the mouth reference point at frequencies of 315 Hz, 500 Hz, and 1 000 Hz. For each frequency the third harmonic distortion is measured in the artificial ear.
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683b5b8a98f7b1390ddd5516ea9247a2
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51.010-1
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30.8.5 Test requirement
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The third harmonic distortion generated shall not be greater than 10 %.
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51.010-1
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30.9 Out-of-band signals
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51.010-1
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30.9.1 Sending
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51.010-1
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30.9.1.1 Definition
|
The discrimination against out-of-band input signals in the sending direction is a requirement on the in-band image frequencies created by any out-of-band input signals.
|
683b5b8a98f7b1390ddd5516ea9247a2
|
51.010-1
|
30.9.1.2 Conformance requirement
|
With any sine wave signal above 4,6 kHz and up to 8 kHz applied at the MRP at a level of ‑4,7 dBPa, the level of any image frequency produced at the digital interface shall be below a reference level obtained at 1 kHz (‑4,7 dBPa at MRP) by at least the amount (in dB) specified in 3GPP TS 03.50; subclause 3.11.1, table 7.
3GPP TS 03.50; subclause 3.11.1.
|
683b5b8a98f7b1390ddd5516ea9247a2
|
51.010-1
|
30.9.1.3 Test purpose
|
To verify that the conformance requirement is met for input signals with frequencies of 4,65 kHz, 5 kHz, 6 kHz, 6,5 kHz, 7 kHz and 7,5 kHz.
|
683b5b8a98f7b1390ddd5516ea9247a2
|
51.010-1
|
30.9.1.4 Method of test
| |
683b5b8a98f7b1390ddd5516ea9247a2
|
51.010-1
|
30.9.1.4.1 Initial conditions
|
The handset is mounted in the LRGP (see annex 1 of ITU-T Recommendation P.76) and the earpiece is sealed to the knife-edge of the artificial ear conforming to ITU-T Recommendation P.51.
The DAI of the MS is connected to the SS and is set to the operating mode "Test of acoustic devices and A/D & D/A".
|
683b5b8a98f7b1390ddd5516ea9247a2
|
51.010-1
|
30.9.1.4.2 Procedure
|
a) A pure tone with a sound pressure of ‑4,7 dBPa is applied at the mouth reference point as described in ITU-T Recommendation P.64 using an artificial mouth conforming to ITU-T Recommendation P 51.
b) For input signals at frequencies of 4,65 kHz, 5 kHz, 6 kHz, 6,5 kHz, 7 kHz, and 7,5 kHz, the level represented by the PCM bit stream at the DAI (Pin 23) of any image frequency is measured.
|
683b5b8a98f7b1390ddd5516ea9247a2
|
51.010-1
|
30.9.1.5 Test requirement
|
The level of any image frequency shall be below a reference obtained at 1 kHz by at least the amount as specified in table 30.5.
Table 30.5
Applied sine-wave frequency
Limit (minimum)
4,6 kHz
30 dB
8 kHz
40 dB
Limits for the image frequency discrimination.
The limit at intermediate frequencies lies on a straight line drawn between the given values on a log(frequency) vs linear(dB) scale.
|
683b5b8a98f7b1390ddd5516ea9247a2
|
51.010-1
|
30.9.2 Receiving
| |
683b5b8a98f7b1390ddd5516ea9247a2
|
51.010-1
|
30.9.2.1 Definition
|
The discrimination against out-of-band signals in the receiving direction is a requirement on the out-of-band signals generated in the artificial ear from in-band input signals.
|
683b5b8a98f7b1390ddd5516ea9247a2
|
51.010-1
|
30.9.2.2 Conformance requirement
|
With a digitally simulated sine wave signal in the frequency range of 300 Hz to 3,4 kHz and at a level of 0 dBm applied at the digital interface, the level of spurious out-of-band image signals in the frequency range of 4,6 to 8 kHz measured selectively in the artificial ear shall be lower than the in-band acoustic level produced by a digital signal at 1 kHz set at the level specified in 3GPP TS 03.50; subclause 3.11.2, table 8.
3GPP TS 03.50; subclause 3.11.2.
|
683b5b8a98f7b1390ddd5516ea9247a2
|
51.010-1
|
30.9.2.3 Test purpose
|
To verify that the conformance requirement is met for input signals at the nominal frequencies 500 Hz, 1 000 Hz, 2 000 Hz and 3 350 Hz.
|
683b5b8a98f7b1390ddd5516ea9247a2
|
51.010-1
|
30.9.2.4 Method of test
| |
683b5b8a98f7b1390ddd5516ea9247a2
|
51.010-1
|
30.9.2.4.1 Initial conditions
|
The handset is mounted in the LRGP (see annex 1 of ITU-T Recommendation P.76) and the earpiece is sealed to the knife-edge of the artificial ear conforming to ITU-T Recommendation P.51.
The DAI of the MS is connected to the SS and is set to the operating mode "Test of acoustic devices and A/D & D/A".
|
683b5b8a98f7b1390ddd5516ea9247a2
|
51.010-1
|
30.9.2.4.2 Procedure
|
a) The SS sends over the DAI (pin 25) a PCM bit stream simulating a sine-wave signal with a level of 0 dBm0.
b) For input signals at the nominal frequencies 500 Hz, 1 000 Hz, 2 000 Hz and 3 350 Hz (bearing in mind the restriction on sub-multiples of the sampling frequency) the level of any out-of-band signals at frequencies up to 8 kHz is measured in the artificial ear.
|
683b5b8a98f7b1390ddd5516ea9247a2
|
51.010-1
|
30.9.2.5 Test requirement
|
The level of out-of-band signals shall be lower than the in-band acoustic level obtained by a digital signal at 1 kHz set at the level specified in table 30.6.
Table 30.6
Image signal frequency
Equivalent input signal level
4,6 kHz
‑35 dBm0
8 kHz
‑45 dBm0
Limits for the image frequency discrimination.
The limit at intermediate frequencies lies on a straight line drawn between the given values on a log(frequency) vs linear(dB) scale.
|
683b5b8a98f7b1390ddd5516ea9247a2
|
51.010-1
|
30.10 Idle channel noise
| |
683b5b8a98f7b1390ddd5516ea9247a2
|
51.010-1
|
30.10.1 Sending
| |
683b5b8a98f7b1390ddd5516ea9247a2
|
51.010-1
|
30.10.1.1 Definition
|
The idle channel noise in the sending direction is the equivalent noise level produced at the DAI, when the mouth reference point is in a quiet environment.
|
683b5b8a98f7b1390ddd5516ea9247a2
|
51.010-1
|
30.10.1.2 Conformance requirement
|
The idle noise in the sending direction shall not exceed - 64 dBm0p at the UPCMI under silent conditions.
3GPP TS 03.50; subclause 3.6.1.
|
683b5b8a98f7b1390ddd5516ea9247a2
|
51.010-1
|
30.10.1.3 Test purpose
|
To verify that the idle noise in the sending direction does not exceed -64 dBm0p at the UPCMI under silent conditions.
|
683b5b8a98f7b1390ddd5516ea9247a2
|
51.010-1
|
30.10.1.4 Method of test
| |
683b5b8a98f7b1390ddd5516ea9247a2
|
51.010-1
|
30.10.1.4.1 Initial conditions
|
The handset is mounted in the LRGP (see annex 1 of ITU-T Recommendation P.76) and the earpiece is sealed to the knife-edge of the artificial ear conforming to ITU-T Recommendation P.51 in a quiet environment (ambient noise less than 30 dBA).
The DAI of the MS is connected to the SS and is set to the operating mode "Test of acoustic devices and A/D & D/A".
|
683b5b8a98f7b1390ddd5516ea9247a2
|
51.010-1
|
30.10.1.4.2 Procedure
|
The noise level represented by the PCM bit stream output at the DAI (pin 23) is measured with psophometric weighting according to ITU-T Recommendation G.223, table 4.
NOTE: The ambient noise criterion should be met if the ambient noise does not exceed NR20.
|
683b5b8a98f7b1390ddd5516ea9247a2
|
51.010-1
|
30.10.1.5 Test requirement
|
The noise produced by the MS in the sending direction shall not exceed ‑64 dBm0p.
|
683b5b8a98f7b1390ddd5516ea9247a2
|
51.010-1
|
30.10.2 Receiving
| |
683b5b8a98f7b1390ddd5516ea9247a2
|
51.010-1
|
30.10.2.1 Definition
|
The idle channel noise in the receiving direction is the acoustic sound pressure in the artificial ear when the digital input signal at the DAI, is the PCM coded value No 1.
|
683b5b8a98f7b1390ddd5516ea9247a2
|
51.010-1
|
30.10.2.2 Conformance requirement
|
1. If no user controlled receiving volume control is provided, or if it is provided, at the setting of the user controlled receiving volume at which the RLR is equal to the nominal value, the noise measured in the artificial ear contributed by the receiving equipment alone shall not exceed -57 dBPa (A) when driven by a PCM signal corresponding to the decoder output value No. 1.
3GPP TS 03.50; subclause 3.6.2.
2. Where a volume control is provided, the measured noise shall not exceed ‑54 dBPa(A) at the maximum setting of the volume control.
3GPP TS 03.50; subclause 3.6.2.
|
683b5b8a98f7b1390ddd5516ea9247a2
|
51.010-1
|
30.10.2.3 Test purpose
|
1. To verify that the idle noise in the receiving direction does not exceed -57 dBPa (A). If a user controlled receive volume control is provided it shall be set to the position where RLR is equal to the nominal value.
2. To verify that if a user controlled receive volume control is provided, the idle noise in the receiving direction does not exceed ‑54 dBPa(A) when the control is set to maximum.
|
683b5b8a98f7b1390ddd5516ea9247a2
|
51.010-1
|
30.10.2.4 Method of test
| |
683b5b8a98f7b1390ddd5516ea9247a2
|
51.010-1
|
30.10.2.4.1 Initial conditions
|
The handset is mounted in the LRGP (see annex 1 of ITU-T Recommendation P.76) and the earpiece is sealed to the knife-edge of the artificial ear conforming to ITU-T Recommendation P.51.
The DAI of the MS is connected to the SS and is set to the operating mode "Test of acoustic devices and A/D & D/A".
|
683b5b8a98f7b1390ddd5516ea9247a2
|
51.010-1
|
30.10.2.4.2 Procedure
|
a) The SS sends a PCM bit stream coded with the value No 1 over the DAI (Pin 25) to the MS.
b) The level of the noise is measured in the artificial ear with any volume control set at the position at which the RLR is equal to the nominal value.
c) Where a volume control is provided, the level of the noise is measured in the artificial ear with the volume control set to maximum.
|
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