3GPP Speech Quality Test Service
PAL provides not only regular 3GPP, GCP, PTCRB tests but also some customizing test specifications. Customers may need to conduct testing follow some special requirements of some main operator specifications – like AT&T, Vodafone, and CMCC. PAL has capability to provide these kinds of customizing test service.
PAL provides not only sample delivering test but also on-site debugging/witness test service. On-site testing is allowed during the test period. Customers will have chances to have comprehensive understanding of the test and then try to solve their issues sooner.
PAL has both anechoic chamber and ETSI room (conforms to ETSI EG 202 396-1 guide). We can evaluate your device performance in two different test environments and compare the deviations.
All tests will be conducted by our acoustic engineers instead of test operators. Customers have chances to get some recommendations and explanations during the test for free.
Handset Mode
|
1. Overall loss\loudness ratings.
2. Idle channel noise.
3. Sensitivity\Frequency characteristics.
4. Sidetone Masking Rating-STMR.
5. Acoustic echo loss.
6. Distortion.
7. Sending Performance in the presence of ambient noise.
|
Headset Mode
|
1. Overall loss\loudness ratings.
2. Idle channel noise.
3. Sensitivity\Frequency characteristics.
4. Sidetone Masking Rating-STMR.
5. Acoustic echo loss.
6. Distortion.
|
Hands-free Mode
|
1. Overall loss\loudness ratings.
2. Idle channel noise.
3. Sensitivity\Frequency characteristics.
4. Acoustic echo loss.
5. Distortion.
|
Mainly in the test sending\receiving path loudness rating, the sound of loudness affect the sound quality during the call.
The purpose of the test item is to evaluate the microphone transmitted loudness , the loudness affect sound quality during the call.
b. Receiving loudness rating(RLR)
The test project is to confirm the speaker volume to ensure that users have the appropriate volume to use.
a. Sending
This test is used to assess the phone's sending path noise. The maximum noise level produced by the apparatus at the output of the system simulator under silent conditions in the sending direction shall not exceed -64dBm0(A) .
b. Receiving
This test is used to assess the phone's receiving path noise.
The maximum noise level at handset and headset user equipment when no signal is transmitted to the input of the system simulator at the maximum volume the measured noise shall be under -54dBPa.
The ratio of artificial mouth input sound pressure transmission microphone to voice codecs (codec) of output voltage.
b. RFR
The ratio of the amount of the artificial ear obtained by the sound pressure and the input voltage of the codec.
The sending part shall be measured between MRP and system simulator audio.
The sending part shall be measured between DRP and system simulator audio.