FM Threshold and Methods of Limiting its Effect on Performance
This paper presents the outcome of the investigative study carried out on threshold effect in FM systems. The study gave a proper insight on how the threshold effect affects the performance of FM systems by giving detailed report on the occurrence. Performance evaluation shows that the threshold is the existence of large noise in the output of the system, which makes signal detection impossible. The effect, as was discovered through analysis, is more serious at very high frequencies as can be seen from the deviational effect noticed on the graph which depicts the presence of noise in the system and it is in-fact a confirmation that noise at that level is frequency dependent. Pre- emphasis and de – emphasis networks were discussed to show how the effect could be controlled in FM systems.