IMAGE-FORMING APPARATUS FOR CONTROLLING PHASE OF CLOCK SIGNAL

PROBLEM TO BE SOLVED: To sufficiently suppress radio noises, conform to various kinds of EMC standards and realize countermeasures at low costs to devices for transmitting signals at high speed or devices having a radio noise-shielding part complicated in a structure. SOLUTION: An HCLK control part 48 shifts a phase of an HCLK signal according to a phase control signal (DATAa, DATAb) to be outputted from an MPU. The phase control is carried out for the HCLK signal of each of MCYK colors. The HCLK signals are controlled to mutually offset respective higher harmonics to make a synthesized wave 0.