System, with sensor positioning indicator, for monitoring a biological signal

An ultrasound fetal monitor for determining the heart rate of a fetus within the mother's body, said monitor comprising:

• a transducer unit, positionable on the mother's body, for generating an ultrasound signal into the mother's body and for generating an output signal representative of an ultrasound signal reflected by the fetus and received by the transducer unit in response thereto;
• a processor coupled to the transducer unit for receiving the output signal and generating therefrom a processed signal representative of the heart rate of the fetus;
• and
• display means, fixed to the transducer unit, coupled to the processor and responsive to said processed signal, for generating a display representative of the processed signal.

An ultrasound fetal monitor for determining the heart rate of a fetus that is within a mother's body, said monitor comprising:

• a transducer unit, positioned on the mother's body, for generating an ultrasound signal into the mother's body and for generating an output signal representative of an ultrasound signal reflected by the fetus and received by the transducer unit in response thereto, the received ultrasound signal being representative of the heart beat of the fetus;
• a processor, coupled to the transducer unit for receiving the output signal and for processing the output signal so as to generate a indicator signal indicative of whether the heart rate of the fetus has been measured;
• and
• display means fixed to the transducer unit and coupled to the processor for generating a display on said transducer unit representative of the indicator signal.