| 摘要 |
PURPOSE:To make a transmitting and receiving terminal small insize, by using in common an M sequence generator, a multiplier and a low pass filter, for various service functions by use of a selector. CONSTITUTION:A spectrum spread signal from a transmission line 350 is multiplied by an output of an M sequence generator 301 by a multiplier 302, this multiplied output is inputted to a low pass filter 312, and a data component is extracted. A high pass filter 303 removes a data component from an output of the multiplier 302, and sends it out again to the transmission line 350 through an adder 306. In case of a multiple address communication receiving mode and a monitoring mode, the spectrum spread signal of the transmission line 350 is added to a multiplier 308 by a selector 309, is multiplied by an M sequence signal, and a result of multiplication is added to the adder 306 through a selector 307 and is sent out to the transmission line 350. |
