Environmental noises such as wind, road, powertrain, and HVAC noise are important aspects to consider when implementing a hands-free terminal for mobile phone calling from within a car. Traditionally, these environmental noises have been exclusively considered for driver comfort; however, with the introduction of the hands-free terminals (HFT) and increasing consumer demand relative to mobile phone call quality, a broader implication of high background noise levels should be considered. HFT algorithm development and implementation can and does provide a high level of background noise suppression to mitigate these concerns, but this is often done at the expense of computational power and cumulative delay during a phone call. The more advantageous solution would be to address the problem from a source and path perspective with emphasis on reduction of noise in the frequency bands which most influence call quality performance. The assessments shown throughout this paper establish a sensitivity of HFT call quality to background noise levels based on industry-standard metrics, including those defined by International Telecommunication Union (ITU) standards. These assessments were established based on a series of experiments that include characterizing vehicle to vehicle variability with a common background noise and single vehicle sensitivity to reductions in background noise. In the background noise sensitivity investigations, filtering investigations were conducted to identify the frequency ranges which drive the most significant degradation in speech intelligibility and HFT performance. The information gained provides insight regarding the requirements for mitigating background noise in the context of both customer comfort as well as HFT performance, both of which are key factors in the perception of overall vehicle quality.


    Access

    Check access

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    Assessment of Automotive Environmental Noise on Mobile Phone Hands-Free Call Quality


    Additional title:

    Sae Technical Papers


    Contributors:

    Conference:

    Noise and Vibration Conference & Exhibition ; 2019



    Publication date :

    2019-06-05




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




    Method for quality assessment of hands-free phone call using hardware-in-the-loop techniques

    Lima, Estácio Cerqueira / Ferreira, Fabrício / Vieira, Rafael Barreto et al. | SAE Technical Papers | 2021


    Quantifying Hands-Free Call Quality in an Automobile

    Cooprider, Anthony / Richardson, Brigitte / Charette, Francois et al. | SAE Technical Papers | 2015


    Quantifying Hands-Free Call Quality in an Automobile

    Amman, Scott / Charette, Francois / Nicastri, Paul et al. | British Library Conference Proceedings | 2015



    Full-duplex hands-free mobile phone system for a digital cellular

    Park,S. / Motorola,US | Automotive engineering | 1993