Patient monitor alarm speaker analyzer

A patient monitor that measures a physiological parameter of a patient by emitting multiple wavelengths of light into body tissue of the patient, the patient monitor comprising:

• a driver circuit that drives one or more emitters at the multiple wavelengths of light;
• a front end processing circuit that:
• (1) receives a signal from a detector responsive to the multiple wavelengths of light from said emitters attenuated by body tissue of the patient, and (2) outputs a conditioned signal;
• and
• a hardware processor that:
• determines a measurement value for the physiological parameter of the patient from the conditioned signal;
• determines that the measurement value triggers an alarm;
• causes a loudspeaker to output an audio alarm responsive to the determination that the measurement value triggers an alarm;
• receives a microphone input signal from a microphone;
• detects the audio alarm in the microphone input signal;
• determines that the detected audio alarm is below a threshold magnitude and that the loudspeaker may therefore be obstructed;
• responsive to said detection, increases a volume of the audio alarm;
• subsequent to increasing the volume of the audio alarm, detects that the audio alarm is still below the threshold magnitude and that the loudspeaker therefore may be obstructed or malfunctioning;
• and
• outputs an indication that the loudspeaker is obstructed or malfunctioning.