It changes the sampling waves into absolute values and set half period as data window length.

该方法是将采样波形取绝对值，定义数据窗长度为半个周期。

youdao

Non coherent demodulation for 2PSK detects relation of carrier wave phase of the interval symbol by the (half period of carrier wave) delay and the adder, then the data is demodulated.

PSK非相干解调法将经延时半个载波周期的接收信号与原接收信号相加，检测出两相邻码元载波相位变化情况，从而解调出数字信息。

youdao

They found that over a period of six years, planting three rows of trees reduced total dust and ammonia by more than half.

VOA: special.2009.09.08

Again, this probably should be cleaned up and in a couple of weeks we'll spend a day or half period trying, to clean it up and make it somewhat more precise.

以上内容还有待梳理,未来两周我们将会花上一天半左右的时间,试着梳理这些内容,使其更加精确

耶鲁公开课 - 死亡课程节选

There's sort of a period around the age of four, four and a half, where kids make the transition from failure to success.

儿童在大约四岁四岁半时,会发生从失败向成功的转变

耶鲁公开课 - 心理学导论课程节选

The researchers, from the Mayo Clinic, looked at 1, 362 men over a five and a half year period.

BBC: Aspirin

Google effectively took a snapshot of Blippy during that half day period.

FORBES: Blippy Apologizes For Google-Searchable Credit Cards, Announces New Security Plan

Police said Cleary, of Melmerby Court in Salford, had signed off on 25 claims made by a Michelle Roberts over a three-and-a-half year period.

BBC: University of Manchester manager jailed for fraud