Operator's Manual

Radical-7 Chapter 1: Technology Overview
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can be processed to produce a respiration rate, measured as breaths per
minute.
Respiratory sounds include sounds related to respiration such as breath
sounds (during inspiration and expiration), adventitious sounds, cough
sounds, snoring sounds, sneezing sounds, and sounds from the
respiratory muscles [1].
These respiratory sounds often have different characteristics depending
on the location of recording [2] and they originate in the large airways
where air velocity and air turbulence induce vibration in the airway wall.
These vibrations are transmitted, for example, through the lung tissue,
thoracic wall and trachea to the surface where they may be heard with
the aid of a stethoscope, a microphone or more sophisticated devices.
rainbow Acoustic Monitoring Architecture
The following figure illustrates how a respiratory sound produced by a
patient can be turned into a numerical measurement that corresponds to
a respiratory parameter.
Patient Sensor Acquisition
System
Respiratory airflow to
sound
Sound to
electrical
signal
Electrical signal
to digital signal