According to the invention, original information is coded in a main channel and a sub channel to generate a signal for transmission, the sub channel being more robust with regard to channel effects.

为了产生要传输的信号，将原始信息编码成为主信道和副信道，其中副信道比主信道对信道干扰更具鲁棒性。

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For example, if the digital TV channel is channel 53, then 53.1, 53.2 and 53.3 could be three sub-channels on that channel.

对于数字频道53来说，53.1，53.2，53.3就是它的三个子频道。

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The elements shown are the most commonly used channel sub-elements.

所示的元素都是最常用的频道子元素。

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The BRAVEN SIX Series speakers have two custom extended-range drivers and 3 watt speaker output providing high-fidelity stereo audio with left- and right-channel passive sub woofers.

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For Facebook, the hope is that by slashing clutter and making content more aesthetically pleasing, users will spend more minutes on the site, clicking through on stories and exploring both the main news-feed channel, and the sub-feeds that appeal to their particular interests.

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