Patent ID: 8385403

Claim:
A digital broadcasting receiving unit for receiving digital broadcasting sent from a base station, comprising: a fixed frequency oscillating portion for oscillating a clock of a predetermined fixed frequency, wherein said predetermined fixed frequency of said clock is adaptively varied for an operation of a demodulation portion; a multiplier portion for multiplying a frequency of said clock of said predetermined fixed frequency and outputting the frequency of said clock after multiplication; a variable digital dividing portion for dividing digitally the frequency of said clock after multiplication from said multiplier portion by a division ratio so as to change said division ratio; a reference time information detecting portion for detecting reference time information which is sent from said base station and is information concerning base station side reference clock which serves as a criterion in said base station; a time information generating portion for generating time information which is information concerning receiving unit side reference clock which serves as a criterion in said digital broadcasting receiving unit; a difference detecting portion for detecting a difference between the frequency of said base station side reference clock and the frequency of said receiving unit side reference clock from said reference time information and said time information; and a division ratio control portion for controlling change of said division ratio based on said difference, wherein said time information generating portion generates said time information based on a clock having a frequency divided digitally by said variable digital dividing portion and feeds back said time information to said difference detecting portion.