| 摘要 |
PURPOSE:To execute a time correction which can execute freely a channel selection operation by selecting plural frequencies, based on a prescribed reference from in all the frequencies by which a time-cast signal is sent and storing them in advance. CONSTITUTION:A channel selection circuit 10 inputs a detecting signal 14 outputted from a tuner 2 and a channel selection signal 15 corresponding to a local frequency, and on the other hand, sends a control signal 9 to the tuner 2 from the circuit 10 side and constitutes a prescribed PLL circuit. Also, a channel selection frequency list 16 in which a channel selection frequency is stored and an NHK frequency list 17 in which a frequency of an NHK broadcast is stored in advance are provided on a memory circuit 13. Subsequently, a time-cast signal processing circuit 12 separates and fetches an advance notice signal 24 and a correct time sound 25 for constituting a time-cast signal 23 of NHK by using a filter from a sound signal 8 outputted from the tuner 2, discriminates whether the fetched signal is the time-cast signal 23 or not, and thereafter, when it is confirmed to be the time-cast 23, a time correcting signal 26 is sent to a timepiece circuit 11 at a prescribed timing. In such a way, the time correction which can execute easily the channel selection operation can be executed. |
