Technical requirements and test methods for acoustics performance of digital mobile terminal
1 Scope
This standard specifies the technical requirements and test methods of acoustics characteristics when digital mobile terminals access GSM, TD-SCDMA, WCDMA or cdma2000 for voice communication.
It is applicable to all kinds of digital mobile terminal equipment used to connect with public digital mobile networks, including but not limited to one or more of the above four systems.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced documents (including any amendments) applies.
ITU-T G.223(11/1988) Assumptions for the calculation of noise on hypothetical reference circuits for telephony
ITU-T G.711 Pulse code modulation (PCM) of voice frequencies
ITU-T G.712(11/2001) Transmission performance characteristics of pulse code modulation channels
ITU-T O.41 (10/1994) Psophometer for use on telephone-type circuits
ITU-T O.131 (11/1988) Quantizing distortion measuring equipment using a pseudo-random noise test signal
ITU-T P.50 (09/1999) Artificial Voice
ITU-T P.51(08/1996) Artificial Mouth
ITU-T P.57(12/2011) Artificial Ears
ITU-T P.58(05/2013) Head and torso simulator for telephonometry
ITU-T P.64(11/2007) Determination of sensitivity/frequency characteristics of local telephone systems
ITU-T P.340(05/2000) Transmission characteristics and speech quality parameters of hands-free terminals
ITU-T P.501(01/2012) Test signals for use in telephonometry
ITU-T P.581(02/2014) Use of head and torso simulator (HATS) for hands-free and handset terminal testing
3 Abbreviations
For the purposes of this document, the following abbreviations apply.
The sending sensitivity/frequency characteristics measured from the mouth reference point to the output port of the reference coder/decoder of system simulator (SS) shall be within the range given in Table 1. On the logarithmic (frequency)/linear (dB sensitivity) coordinates, draw a straight line between the discontinuous points in Table 1 to get a range (as shown in Figures 1 and 2) within which there shall be the testing results.
The receiving sensitivity/frequency characteristics measured based on the equalized scattering field from input port of the reference coder/decoder of system simulator (SS) to the drumhead reference point (DRP) shall be within the range given in Table 3. On the logarithmic (frequency)/linear (dB sensitivity) coordinates, draw a straight line between the discontinuous points in Table 3 to get a range (as shown in Figures 4 and 5) within which there shall be the testing results.
