| 摘要 |
<p>PURPOSE:To provide the demodulation device for the synchronous type SS modulated wave which eliminates the interference disturbance of conventional technology in principle. CONSTITUTION:This device is equipped with an inverse spreading means 3 which inversely spreads a spread spectrum modulated wave by multiplying it by a spread code outputted from a spread code generator 27, a synchronism detecting means 4 which detects the synchronism of the obtained inverse spread modulation output, and a carrier regenerating means 50 which regenerates a carrier according to the obtained inverse spread demodulation output. Further, the device is equipped with frequency dividing means 26 and 27 which divide the frequency of the regenerated carrier to generate clock signals for a spread code generator, suppressing means 49 and 41 which suppress and remove spread noise components in the synchronism detection output, a synchronism detecting means 34 which performs synchronism detection as sliding correlation synchronism acquisition for the output signals of the suppressing means, and control means 35 and Sw which control the number of frequency divisions of the regenerated carrier of the frequency dividing means by using the obtained synchronism detection signal as a control signal.</p> |
