Patent ID: 8462270
Filing Date: 2013-06-11
Classification: G09G

Abstract:
1. A digital image transmission apparatus which transmits a digital video signal including digital image data via an image generating unit that comprising a transmission side clock terminal and a transmission side phase locked loop (PLL) circuit, a control signal which is synchronized with said digital image data, and a clock signal in a predetermined frequency range of frequencies of said clock signal, said digital image transmission apparatus comprising: a transmit side frequency conversion unit arranged between the transmission side clock terminal and an input terminal of the transmission side PLL circuit that, when transmitting a digital video signal having, as a variant clock signal, a clock signal of a frequency which does not fall within said predetermined frequency range, carries out a frequency conversion of the frequency of said variant clock signal so as to generate a transmit side clock signal having a frequency which falls within said predetermined frequency range; a transmitting unit that transmits, as a transmission digital video signal, said digital image data and said control signal, as well as said transmit side clock signal, according to the transmit side clock signal; a receiving unit that receives said transmit side digital video signal so as to acquire said digital image data and said control signal according to said transmit side clock signal, said receiving unit comprising reception side PLL circuit and a reception side clock terminal; and a receive side frequency conversion unit arranged between an output terminal of the reception side PLL circuit and an input terminal of the reception side clock terminal that carries out a frequency conversion of said transmit side clock signal so as to output said variant clock signal, wherein frequency multiplication ratio of said transmit side frequency conversion unit and frequency dividing rate of said receive side frequency conversion unit are determined according to both clock frequency of the variant clock signal and clock frequency range of the transmit side clock signal so that the multiplication ratio and frequency dividing rate are even numbers.