Patent ID: 7817522

Claim:
A recording clock generation apparatus for generating a recording clock to be used when performing recording on plural recording media based on DVD+RW/+R and DVD-R/RW standards of frequencies at recording, using the same recorder, said apparatus comprising: a frequency conversion circuit for converting an inputted 32T-cycle binarized wobble signal based on a DVD+RW/+R standard into a 186T-cycle binarized wobble signal based on a DVD-R/RW standard; a selector for selecting, as a selected 186T-cycle binarized wobble signal, either the converted 186T-cycle binarized wobble signal that is outputted from the frequency conversion circuit or the inputted or an inputted 186T-cycle binarized wobble signal, and outputting the selected 186T-cycle binarized wobble signal; and a PLL circuit for 186-multiplying the frequency of the selected 186T-cycle binarized wobble signal of outputted from the selector for generating said recording clock.