Patent ID: 7899133

Claim:
A receiving system, comprising: a memory storing data contained in a transmission signal; an extraction unit configured to extract a clock parameter contained in the transmission signal; a parameter change unit configured to change the clock parameter in accordance with a result of a comparison between a data storage rate of the memory and a predetermined value; a frequency setting unit configured to set a read frequency using the changed clock parameter; and a data read unit configured to read the data from the memory in synchronization with a clock signal of the read frequency, wherein: the parameter change unit keeps the clock parameter to maintain the data storage rate at a predetermined start value Rb at time tl, in case that a read rate determined by the read frequency calculated from the unchanged clock parameter contained in the transmission signal matches the data storage rate when data is read after the data is stored in the memory; the parameter change unit keeps the clock parameter when the data storage rate is still higher than the predetermined lower limit Ru after the date storage rage of the memory suddenly decreases at time t 2 due to temporary suspension of the transmission signal; the parameter change unit changes the clock parameter to decrease the read frequency when the data storage rate becomes lower than a predetermined lower limit Ru at time t 4 after the data storage rate is suddenly decreased at time t 3 due to another temporary suspension of the transmission signal; the parameter change unit changes the clock parameter to raise the read frequency when the data storage rate of the memory increases and the data storage rate reaches a predetermined upper limit Ro at time t 5 ; and the parameter change unit changes the clock parameter to decrease the read frequency when the data storage rate reaches the predetermined lower limit Ru at time t 6 .