Jukka Mikael Tenkama,Hannu Antero Pohjanpalo,Miikka Lehikoinen,Mika Rapo,Tomi Markus Makela,Jussi Ilmari Eronen,Juha-Kyosti Hermanni Heleva
申请号：
US14686081
公开号：
US20150332584A1
申请日:
2015.04.14
申请国别(地区):
US
年份:
2015
代理人:
摘要：
A patient monitor that includes a system for testing the operation of a speaker included in the patient monitor is disclosed. The control unit of the patient monitor generates a low frequency test signal to the speaker. The speaker generates the test signal at a frequency that is below the normal audible range for a human ear. A current sensing device detects the current draw of the speaker during operation. The current draw is analyzed to determine whether the speaker is operating properly. A backup speaker is used to generate an audible alarm when the speaker is not working properly. A microphone can be included to detect the inaudible test signal.
