Patent ID: 7505536

Claim:
An energy dispersal circuit which is used for a receiver, wherein said receiver receives a data signal which is divided into packets of a predetermined number of bits, constituted as a frame of a predetermined number of packets, and said receiver executes energy dispersal with respect to the data signal, the energy dispersal circuit comprising: a state setting section; a pseudo random binary signal (PRBS) generating section which includes a shift register for executing shifts in accordance with transmission bits and an exclusive-OR operator for inputting a partial output of said shift register and executing a first exclusive-OR operation thereto, wherein said exclusive-OR operator further outputs and feeds back a result to said shift register to be inputted therein, said shift register is initialized per frame by a register initial value, and which generates a pseudo random binary signal; and an exclusive-OR circuit which executes a second exclusive-OR operation with respect to the pseudo random binary signal obtained from said PRBS generating section and the data signal; wherein said state setting section generates data of said shift register shifted in one frame from an initial state of said PRBS generating section in accordance with a transmission bit number from the initial state and provides the data to said shift register of said PRBS generating section; and said state setting section calculates a state of said PRBS generating section based on an operated packet number from the initial state of said PRBS generating section, and provides a result to said shift register of said PRBS generating section.