Single Channel Telemetry System:
Here the physiological variables from a solitary patient are calculated using appropriate electrodes and sensors and fed to the radio transmitter after appropriate signal conditioning. In a single channel system a battery functioned radio transmitter is linked to the electrodes of the patients. This transmitter transmits the bio-potential over a restricted range to a distantly situated receiver. The receiver senses the radio signals and after good signal conditioning, recovers the original signals for additional processing. The basic block diagram of a single channel telemetry system is parallel to that of a basic biotelemetry system.
Figure shows a block diagram of a distinctive radio telemetry single channel system. From the block diagram, the Biological signal from patient is transmitted to Transducer and sensor, There it is transmitted to Signal conditioner and then to the Transmitter. This transmitted original signal is transferred by Signal conditioner and then to the Display and readout. The radio frequency utilized in the system differs from a hardly any hundred KHz to some MHz. Further than this frequency range the reduction due to subject body turn out to be excessive. AM is not adopted for biotelemetry system since the presence of noise can affect the measured variables severely. That is why we usually adopt either frequency modulation or pulse modulation techniques to transmit the bio-signals.
Here the physiological variables from a solitary patient are calculated using appropriate electrodes and sensors and fed to the radio transmitter after appropriate signal conditioning. In a single channel system a battery functioned radio transmitter is linked to the electrodes of the patients. This transmitter transmits the bio-potential over a restricted range to a distantly situated receiver. The receiver senses the radio signals and after good signal conditioning, recovers the original signals for additional processing. The basic block diagram of a single channel telemetry system is parallel to that of a basic biotelemetry system.
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| block diagram of biotelemetry system |