| 摘要 |
PURPOSE:To find out a tuning point simply, by forming a tuning indication signal by a logical product between an S curve detection signal through a PM detection output and an input electric field strength detection signal with a prescribed level or more. CONSTITUTION:A logical product between an output of an S-shape curve detection circuit 13 which detects a tuning point by using the S-shape characteristic of the output of a PM detector 8 and an AGC voltage of an AGC filter 6 used if the input electric field strength of a reception station is at a required level for stereo reproduction, is taken at an AND circuit 14 and the result is illuminated on a lamp L2. Thus, when the lamp L2 illuminates, it shows that accurate tuning is made to a reception station with required electric field intensity for stereo reproduction. The channel selection can be made simple through the presence of the illumination of the lamp L2. |
