How to measure the incoming call quality in android phones ?

Discussion in 'General Electronics Chat' started by dheeraj bajaj, Apr 20, 2013.

  1. dheeraj bajaj

    Thread Starter New Member

    Apr 20, 2013
    1
    0
    The incoming call quality depends on many factors :

    1. sound pressure level
    2. Qos
    3. Loudness
    4. Sharpness
    5. Signal to noise ratio
    6. Mos

    Can we record the incoming voice call and analyse above parameters in a graphical form with the help of some tool or software ?
     
  2. crutschow

    Expert

    Mar 14, 2008
    13,046
    3,244
    I would assume an audio signal (or spectrum) analyzer would do what you want.
     
  3. YokoTsuno

    Member

    Jan 1, 2013
    41
    9
    Such tests are generally done in a lab and in a different way.

    a) Since the link between the base station and any wireless/mobile device is digital you can “ignore” the influence of link quality on sound quality. The reason is that sound quality in a digital media depends on predetermined parameters (ADC resolution, compression techniques, etc.) which are known beforehand and defined by the used technology.

    In fact, the quality of the overall link between a base station and a wireless device is defined in Bit Error Rate (BER), which is the rate of correctly received bits with respect to the total of received bits. Above a certain BER (Value depends on the used technology) your connection simply fails and measuring sound quality will be futile since there is simply no sound to begin with.

    b) If you refer to the sound quality (frequency response, THD, etc.) of the wireless device itself, specific standards exits (ITU-T Rec. P.58, IEC 60318, 3GPP). These documents can be downloaded (not always FOC) from the respective organisation.

    Tests are typically done by fixing the wireless device on an artificial head (HATS) in a way an average human would hold his/her device.

    http://en.wikipedia.org/wiki/Br%C3%BCel_%26_Kj%C3%A6r

    The HATS has an integrated microphone (ear) and speaker (mouth). For testing a connection is set-up between the device under test and a wireless test set (Agilent E5515, R&S CMU). The speaker in the HATS is connected to a sound source, usually a sweep generator or audio analyser (B&K, Agilent U8903, R&S UPV). The received sound is then analysed via the analogue or digital outputs on the wireless test set.

    Some wireless devices also have test modes that allow the CODEC, amplifiers, speaker, and microphone to operate without a proper wireless connection present. This usually works by sending a command via the device's USB or COM port. This information is however rarely publicly available.
     
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