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Chicago Fire Digital Project

Chicago Fire Digital Project

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Chicago Fire Digital Project

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  1. Chicago Fire Digital Project Commander Leonard Edling Chicago Fire Department

  2. Chicago Fire Department Portable Radio Audio Intelligibility in Noise Testing June 23 - 25, 2009

  3. Test Overview • Test the radio “Transmitted Speech Intelligibility” while operating in typical fire ground background noise conditions • Instructions given to test scorers: • Test messages would be a series of fire ground related radio transmissions. Most transmissions will have noise in the background.score the perceived speech intelligibility of the received transmission. • Test were not meant to try and score the “delivered audio quality” of the transmission. Rather, the goal is to measure the transmitted speech intelligibility in various operating environments.

  4. Test Overview (cont.)

  5. Best Practices • Using the “IAFC Best Practices”, transmit audio quality and intelligibility can be improved significantly • Keys for improvement • The position and angle of the radio microphone • Holding the radio microphone 1-2 inches directly in front of the SCBA Voice Port (IAFC Best Practice, Section 1, Recommendation 2) • The volume level and clarity of voice • Speaking in a loud (not shouting), clear voice produces the best transmit audio quality and intelligibility (IAFC Best Practice, Section 1, Recommendation 3)

  6. Radio Microphone Positioning • STANDARD POSITION • 3”-5” from Voice Port • Hand blocking port • Facing noise source • “BEST PRACTICES” POSITION • Against Voice Port or near mouth area • Facing away from noise source

  7. Radio Microphone Positioning STANDARD POSITION (3”-5” from Voice Port, Hand blocking port) “BEST PRACTICES” POSITION (against Voice Port or near mouth area)

  8. Other lessons Learned • Radios should be optimized for use • Accessories Can have a big impact on performance • Noise Suppression software can have significant impact • Multiple settings may be needed for different types of users • PASS Alarm Protocol Identified • 3 Step Protocol • Turn off PASS device before radio communications • Cover PASS device with other hand • Talk between PASS device chirps • Training needs to be completed for all radio users

  9. Audio Test Recording Samples K950 Saw Cutting SCBA Low Air + PASS Analog: Current CFD Digital: Analog: Noise Shield 2 Digital: Best Practices Best Practices Standard Standard

  10. QUESTIONS? Commander Leonard Edling 312-745-1045 ledling@cityofchicago.org