Philips Medical Systems

 

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Year: 2007
Customer:  Philips Medical Systems
Services: Frequency response measurement and optimization of a cardiotocograph

Philips Medical Systems manufactures (among many other medical devices) Fetal monitors which are used to monitor heart rates of unborn babies. During the development of their new flagship fetal monitor, the  Avalon FM50, was asked to measure and optimize the frequency response of this ultrasound device.

A unique method of measurement was developed together with the client to measure the transfer function from the ultrasound sensor to the loudspeaker reproduction of the device. The object of the measurement was to develop filter parameters to optimize the frequency response for natural sounding reproduction of the fetus' heartbeat.

The measurements were performed in the anechoic room of the  Institute for technical acoustics of TU Berlin.

The measurement results were used by to generate dedicated filter parameters which could easily be integrated by the client into the device.

Meanwhile, the  Avalon FM50, is now being successfully sold with the optimized frequency response and helps doctors, midwifes and parents around the world to listen to their unborn babies.