Selectively called radio receiver in which bit rate detection is

Abstract

In a selectively called radio receiver in which a demodulated signal of a specific bit rate is produced with battery saving kept in synchronism with the demodulated signal, a bit rate detecting unit detects the bit rate with a controllable sensitivity while the synchronism is lost. A bit rate detecting control arrangement controls the sensitivity within a predetermined sensitivity range. The bit rate detecting unit may misdetect the bit rate with a variable misdetection rate which is accumulated to an incremented amount from an initial amount representative of no misdetection while the synchronism is lost. The bit rate detection control arrangement may decrement the misdetection rate to the initial amount when the incremented amount reaches a predetermined amount. Alternatively, the bit rate detection control arrangement may control the misdetection rate between a greater and a smaller amount and then cause the misdetection rate to return to the initial amount. In either event, the bit rate detection control arrangement controls the sensitivity within a predetermined range.