Hearing loss hazard for call center workers

TOKYO, Japan - Dec. 2, 2013 - PRLog -- Loud machinery, equipment or vehicles have always been considered the main culprits for noise-induced hearing loss, but these are - to a great extent - controlled by rules, regulations and careful monitoring.

For years it was believed that being a call centre operator was a low-risk occupation, but personal injury claims by call centre workers are increasing. These include repetitive strain injury, eyesight and posture problems, transient balance disorder, tinnitus and noise-induced hearing loss.

One of the main causes of hearing damage in a call centre is acoustic shock, which occurs when a sudden and unexpected burst of high-frequency noise is transmitted through the operator’s headset.

Dr Setsuo Maeda, a Professor of Human Vibration at Kinki University, Osaka, Japan, has conducted research to compare the use of conventional headsets with bone-conducting devices - and to evaluate whether newly available bone-conducting devices reduce the risk of temporary or permanent hearing loss.

The testing took six days, using a Head and Torso Simulator (HATS), supplied by Brüel & Kjær. In parallel with the actual workers making calls, the incoming call signal from the telephone was divided between two headsets. A PULSE data acquisition system, a monaural headset and a Personal Noise Dose Meter Type 4448 were also used.

“The call centre where we carried out the tests is small and noticeably quieter than the large, international call centres that employ hundreds of people,” says Dr Maeda. In fact, the largest call centre in Okinawa employs 3,000 people, making these workplaces potentially much louder than the test call centre. “My conclusion is that hearing damage could occur at levels above 90 dB(A),” says Dr Maeda.

Dr Maeda has also conducted laboratory experiments using HATS and PULSE to compare normal headphones, with bone-conducting headsets, using white noise and found: “bone conducting devices help to prevent hearing loss.” This has also been confirmed by studies carried out at the University of Southampton in the United Kingdom.

The full case study is available on Brüel & Kjær’s website: www.bksv.com (http://list.bksv.com/t/24628/40583727/48/0/)

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About Brüel & Kjær

Brüel & Kjær has an unparalleled portfolio of sound and vibration equipment and is a long-established designer and manufacturer of innovative instrumentation including sound level meters, microphones, accelerometers, conditioning amplifiers, calibrators, noise and vibration analyzers, and PULSE software. In addition, Bruel & Kjaer designs and manufactures the LDS range of vibration test systems, as well as complete airport and environmental monitoring systems: WebTrak, ANOMS, NoiseOffice and Noise Sentinel.

Brüel & Kjær also runs a variety of training courses, from basic introductions to noise and its effects to more specialised classes teaching customers how to get the most out of their equipment. Free, online training courses - conducted by our expert engineers - run throughout the year too.

Brüel & Kjær is a subsidiary of UK-based Spectris plc, which has annual sales of £1.1bn and employs around 7,500 people worldwide across its four business segments.