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

FEV North America, Inc.-Jeffrey Pruetz, Channing Watson, Todd Tousignant, Kiran Govindswamy
Published 2019-06-05 by SAE International in United States
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…
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CIRCUIT BREAKER, AIRCRAFT, TRIP-FREE PUSH PULL, TYPE I, DUAL SAFETY, −55 THRU +121 °C

AE-8B Protective and Control Devices
  • Aerospace Standard
  • AS58091/1A
  • Current
Published 2019-05-31 by SAE International in United States
No Abstract Available.
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Terminals, Lug: Splices, Conductor: Crimp Style, Copper, General Specification for

AE-8C2 Terminating Devices and Tooling Committee
  • Aerospace Standard
  • AS7928C
  • Current
Published 2019-05-23 by SAE International in United States

AS7928 includes insulated and uninsulated crimp-style copper lug terminals and conductor splices for stranded conductors.

 
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Standardized Symbols for Electrical Circuit Diagrams

Truck and Bus Electrical Systems Committee
  • Ground Vehicle Standard
  • J2221_201905
  • Current
Published 2019-05-16 by SAE International in United States
This SAE Recommended Practice identifies graphic symbols used in electrical circuit diagrams. The symbols aid troubleshooting electrical systems.
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INSTALLING AND REMOVAL TOOLS, CONNECTOR ELECTRICAL CONTACT, TYPE III, CLASS 2, COMPOSITION C

AE-8C2 Terminating Devices and Tooling Committee
  • Aerospace Standard
  • AS81969/1B
  • Current
Published 2019-05-03 by SAE International in United States

Scope is unavailable.

 

INSTALLING AND REMOVAL TOOLS, CONNECTOR ELECTRICAL CONTACT, TYPE II, CLASS 1, COMPOSITION C

AE-8C2 Terminating Devices and Tooling Committee
  • Aerospace Standard
  • AS81969/19A
  • Current
Published 2019-05-03 by SAE International in United States

Scope is unavailable.

 
 

INSTALLING AND REMOVAL TOOLS, CONNECTOR ELECTRICAL CONTACT, TYPE I, CLASS 1, COMPOSITION C

AE-8C2 Terminating Devices and Tooling Committee
  • Aerospace Standard
  • AS81969/17A
  • Current
Published 2019-05-03 by SAE International in United States

Scope is unavailable.

 
 

CONNECTOR, RECEPTACLE, REVERSE BAYONET COUPLING, JAM NUT, WITH ACCESSORY THREADS

AE-8C1 Connectors Committee
  • Aerospace Standard
  • AS95234/8
  • Current
Published 2019-05-01 by SAE International in United States
No Abstract Available.
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