What type of system is NOT typically used for fire alarm notifications?

High-frequency alarms are not typically used for fire alarm notifications, primarily because they do not align with the standard communication techniques for alerting individuals in the event of a fire. Fire alarm systems generally employ audible alarms, such as bells or horns, which produce a sound loud enough to alert occupants throughout a building. Visual alarms, such as flashing lights, are also essential for signaling in environments where audible alerts may not be sufficient, ensuring that people with hearing impairments are informed.

Tactile alarms, while less common, may be utilized in specific environments, particularly for the deaf or hard-of-hearing community, by providing vibrations or tactile feedback. In contrast, high-frequency alarms are less effective and not standard in fire alarm notifications because their sound may be difficult for many individuals to hear or may cause discomfort, ultimately defeating the purpose of an effective alert system. Therefore, the focus is primarily on more universally understood and efficient methods of alarm notifications, making high-frequency alarms less suitable for this application.