Patent ID: 7528891

Claim:
A digital signal transmission system comprising a transmission apparatus and a reception apparatus, the digital signal transmission system wherein the transmission apparatus comprises: clock generating means for generating a first clock and a second clock; frequency information outputting means for outputting frequency information related to a frequency of the first clock; first signal processing means for processing a first signal and outputting a first digital signal based on the first clock generated by the clock generating means; second signal processing means for processing a second signal and outputting a second digital signal based on the second clock generated by the clock generating means; and transmitting means for transmitting the second clock generated by the clock generating means, the frequency information output by the frequency information outputting means, the first digital signal output by the first signal processing means, and the second digital signal output by the second signal processing means; and the reception apparatus comprises: receiving means for receiving the signals transmitted by the transmitting means; division ratio information generating means for generating division ratio information, which represents a division ratio, based on the frequency information extracted from the signals received by the receiving means; and clock reproducing means for reproducing the first clock based on the second clock extracted from the signals received by the receiving means and the division ratio information; wherein the clock reproducing means generates a signal of a comparative frequency by dividing a signal of given frequency, the signal of given frequency generated based on a result of comparison of phase of a signal of reference frequency with the signal of comparative frequency, wherein the signal of reference frequency is generated by dividing the second clock.