This paper introduces signal switchover circuit that transforms voltage signal to current signal in order to improve signal reliability.

介绍一种旨在提高信号传输可靠性而设计的信号转换电路，它将电压信号变换成电流信号进行传输。

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The switchover to digital signal by 2012 means that multichannel choice will soon be available to almost all households.

2012年，英国将完成模拟信号向数字信号的转换，这就意味着几乎每家每户都可自由选择多种频道。

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The switchover has happened in the Border, Granada and South West television regions, with the majority of the rest of the country turning off the analogue signal over the next two years.

在边境、格拉纳达和西南地区，已经实现了数字转换，全国的其余大部分地区未来两年内将关闭模拟信号传输。

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The report noted that up to 204 relay transmitters in Wales needed to be converted to carry the DTT signal before switchover happened.

BBC: NEWS | UK | Wales | Wales head of digital TV league

The switchover began early on Wednesday morning when BBC Two's analogue signal was permanently turned off at the Oxford transmitter group.

BBC: England

The analogue TV signal in Northern Ireland will be turned off permanently on Tuesday night, completing the final stage of the UK digital switchover.

BBC: Digital Switchover