Students: FM/DM systems are often used with children who are deaf or hard of hearing. There’s a wide range of people who might benefit from using an FM/DM system: Who benefits from using one? / Who should consider using FM/DM systems? Audiologists and hearing instrument specialists prefer the term "remote microphone hearing assistive technology" (RM-HAT), since it’s inclusive of both types of systems. Note: While they use different signals, perhaps since they operate fairly similarly, and FM has been around for a while, both systems are often referred to as FM. “My own experience of using DM systems is that their sound quality is significantly clearer than that of FM systems, which reduces the challenges of the listening situation,” Sparks, who is deaf, notes. If you see “FM” and think “radio” you’re on the right track-this type of system uses FM radio signals designated by the FCC to transmit sound, Nesson says.ĭM systems, in contrast, use digital signals, and tend to have better sound quality while avoiding potential for interference (think: the staticky sound of another FM station coming through), Sparks says.
“An FM system is not a substitute for a hearing aid,” says Rhee Nesson, AuD, founder of Hearing Doctors of New Jersey-but these devices are often added to hearing aids, she says. The receiver can be a simple pair of headphones, ear-level receivers that deliver the sound into the ears, or a hearing device, such as cochlear implants or hearing aids, Sparks explains. Here’s how it works: The speaker uses a microphone, while the listener wears a receiver. What exactly are FM/DM systems? Teachers or other speakers can wear a “They take sound that is farther away and bring it closer to the listener,” Sparks says.įind out more about how these systems work, along with who might consider taking advantage of them, when FM/DM systems are ideal for use, and more. Common in school settings, they help filter out unwanted noise.īoth systems improve the signal-to-noise ratio, explains clinical audiologist Sarah Sparks, Au.D, founder of Audiology Outside the Box PLLC in Washington, DC. Using microphones and receivers (including hearing aids), these systems help you hear better and reduce background noise.
Interesting in hearing better in group settings? You may want look into FM and DM systems.
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