| 摘要 |
PURPOSE:To relieve a failure quickly even if a failure takes place in a device of a route which is in use, by controlling a circuit element corresponding to each parameter of the said route via a selecting circuit accompanied with the element. CONSTITUTION:A controlling circuit 29 transmits a switching control signal to set an osicllating frequency of a local oscillator 21 via a control line 101. A selecting control signal for setting a prescribed band width in a NPF 22 is transmitted via a controlling line 102. Further, a controlling signal for setting a parameter corresponding to the specified channel size in a loop filter 23, an amplitude compensation circuit 24, a demphasis circuit of an FM modulation section, a cascade circuit 26 to an LPF, an out-band noise pass filter 27 and a local osicllator 28, are transmitted via a control line 103. Since an RAM and an ROM are provided to the circuit 29, the circuit 29 transmits the control signal to each selection circuit automatically so as to set the prescribed parameter by a command of an external switching signal. |
