| 摘要 |
PURPOSE:To quicken the establishment of synchronization by providing a shifter shifting a pseudo noise signal stored in advance. CONSTITUTION:A variable shift register 9 uses a reset signal Res generated at the same time as an input gate signal tw to decide a head code PN3 of a PN code generator 8, applies shift of bits to the code by a count output C of a counter 5 and outputs a pseudo random code PN4 synchronously with a spread input signal. An output of the variable shift register 9 is used to apply exclusive OR processing to the inputted spread signal with a spread demodulator 30, from which information data is outputted. Thus, the input spread signal is subject to inverse spread with an output of the variable shift register 9, and since the demodulated information data is coincident with the data of a sender and the pseudo random code PN4 being the synchronizing output is outputted directly from the variable shift register 9, much time is not required for generating an output. |
