問題：
What is the modulation technique used for digital terrestrial TV in Europe+ Japan and Australia?
答案：
Orthogonal frequency domain multiplex (OFDM) was first promoted in the early 1990s as a wireless LAN technology. OFDM's spread spectrum technique distributes the data over a large number of carriers that are spaced apart at precise frequencies. This spacing provides the "orthogonality" in this technique which prevents the demodulators from seeing other frequencies than their own. Coded OFDM (COFDM) adds forward error correction to the OFDM method.
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