Apparatus and methods are provided for measuring a heartbeat of a fetus in a pregnant subject. One method embodiment includes selecting a memory location that has a virtual memory address and a unique descriptor, assigned to it. The quick access service may have a fixed Packet Identification andor fixed IP address. The frame rate conversion processing section converts the picture image signal at the first frame rate into a cinema film signal at a third frame rate which is smaller than the first frame rate, and which is different from the second frame rate. An actuator is secured to rotate with the turbine rotor and is mechanically connected to the synchronization ring by a plurality of connection arms connected to the actuator rod and hinge-mounted on the synchronization ring such that actuating the actuator causes the synchronization ring to move in turning about the longitudinal axis.