Patent ID: 8521176

Claim:
A transmission apparatus comprising, a comparison unit configured to provide threshold values associated with a nominal frequency for a parameter corresponding to an amount of data indicative of a signal frequency, and compare an input parameter obtained by cumulatively adding a correction value to the parameter, with the threshold values; a correction unit configured to output a value of the input parameter when the input parameter is within a range defined by the threshold values, and output an associated one of the threshold values when the input parameter is out of the range defined by the thresholds so as to eliminate an amount exceeding or falling short of the range defined by the threshold values to thereby correct the input parameter; and an addition unit configured to detect the correction amount which is associated with an amount of an immediately preceding value of the input parameter exceeding or falling short of the range defined by the threshold values, and cumulatively add the correction amount to the input parameter which is to be compared with the threshold values this time.