Content for TR 43.058 Word version: 16.1.0
4 Characteristics, test methods and quality assessment
A Subjective Tests from UTS
B Bibliography
$ Change history
4 Characteristics, test methods and quality assessment
4.1 Environmental conditions for a car type handsfree Mobile Station
4.1.1 Data available on real use environment
4.1.1.1 Reverberation and echo
4.1.1.2 Sources and types of noise. Level and Spectra of the noise Word‑p. 8
4.1.1.2.1 Noise due to engine, tyres and moving situations
4.1.1.2.2 Noise due to equipment inside the cars Word‑p. 13
4.1.1.2.3 Signal to noise ratio in the car situation Word‑p. 14
4.1.1.3 Noise and echo Word‑p. 15
4.1.2 Environment for testing handsfree mobile station Word‑p. 17
4.1.2.1 Classification of handsfree mobile terminals
4.1.2.2 Vehicle simulator
4.1.2.3 Advisory text for installation of handsfree MS in a vehicle environment Word‑p. 18
4.1.2.4 Test environment
4.1.3 Measurements on a GSM handsfree telephone - Influence of the environment and the test conditions on frequency responses and loudness ratings Word‑p. 19
4.2 Delay in handsfree terminals implemented with signal processing techniques Word‑p. 22
4.2.1 Signal processing techniques for acoustic echo cancelling and noise reduction
4.2.2 Examples of delays due to signal processing techniques
4.3 Speech quality assessment Word‑p. 24
4.3.1 General - Factors affecting the speech quality of the GSM system and derivatives
4.3.2 Main Assessment Criteria for Handsfree processing used in GSM mobile environment Word‑p. 27
4.3.3 Evaluation Methodology for Full-Duplex Acoustic Echo Controllers developed within the FREETEL-Esprit project Word‑p. 28
4.3.3.1 Objective Evaluation procedure
4.3.3.1.1 Objective Evaluation methodology of AEC devices Word‑p. 29
4.3.3.1.2 Test Signals used from the FREETEL-Esprit Database Word‑p. 32
4.3.3.2 Adapted objective evaluation procedure to a GSM Handsfree mobile
4.3.4 Subjective tests Word‑p. 38
A Subjective Tests from UTS Word‑p. 41
B Bibliography Word‑p. 45
B.1 References of TD presented in SMG2/ad hoc 03.50 meetings
B.2 References from subclause 4.1
B.3 References from subclause 4.2.1 Word‑p. 46
B.4 References from subclause 4.3.1
B.5 References from subclause 4.3.3
$ Change history Word‑p. 47
