Tuner control system

Claim 1

A tuner control system which comprises: a radio receiver means; a detector for detecting a signal level of a wave received by said radio receiver means; a means for setting a reference signal level; a comparator means for comparing a detected signal level with said reference signal level; a switching means for switching tuning frequency of waves received by said radio receiver means; a control means for controlling the operation of said switching means in response to a result of the comparison in said comparator means and to a predetermined wave condition, in which said reference signal level setting means has a high reference signal level setting circuit and a low reference signal level setting circuit; said comparator means comprises a first comparator and a second comparator; said first comparator is arranged to compare a detected signal level with said reference signal level, said control means is arranged to operate said switching means when said detected signal level is lower than said low reference signal level, said second comparator is arranged to compare said detected signal level with said high reference signal level, and said control means has first and second counters and a digital comparator, said first counter being arranged to count the number of times when said signal level was lower than said reference signal level, said second counter to count the number of times when said signal level was higher, respectively, and, said digital comparator being arranged to compare the counts of said first and second counters therebetween.