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A stable modulation and demodulation technique of the physical address is essential to a HD-DVD system where the physical address is recorded in the form of a modulated wobble. Many modulation techniques have been introduced and adapted for HD-DVD experiments. Among them, the MSK (minimum shift keying) modulation is attracting more attention recently because it has many advantages for the HD-DVD system, such as continuous phase form, constant amplitude envelope, and so on. But the typical coherent MSK demodulator is composed of analog signal multipliers, integrators, and other complicated logic circuit blocks. Therefore, the hardware implementation of the demodulator is very complex and demodulation performance is quite dependent on individual devices. To solve these problems, we propose a new digital non-coherent MSK demodulation technique in this paper.