讀書心得分享

1.要利用現有科技，e.g.ipad、notebook、youtube、printer、autocab、matlab。令你的概念愈具體愈好。突顯時代的進步。

2.請o係60秒內讀畢以下文字。如果超時，就表示你閱讀英文的速度不足。如果讀完但無法大略理解，表示你理解力不足。


Maintaining the sampling theorem criterion

Since downsampling reduces the sampling rate, we must be careful to make sure the Shannon-Nyquist sampling theorem criterion is maintained. If the sampling theorem is not satisfied then the resulting digital signal will have aliasing. To ensure that the sampling theorem is satisfied, a low-pass filter is used as an anti-aliasing filter to reduce the bandwidth of the signal before the signal is downsampled; the overall process (low-pass filter, then downsample) is called decimation. Note that if the original signal had been bandwidth limited, and then first sampled at a rate higher than the nyquist minimum, then the downsampled signal may already be nyquist compliant, so the downsampling can be done directly without any additional filtering. Downsampling only changes the sample rate not the bandwidth of the signal. The only reason to filter the bandwidth is to avoid the case where the new sample rate would become lower than the nyquist requirement and then cause the aliasing by being below the nyquist minimum.
Thus, in the current context of downsampling, the anti-aliasing filter must be a low-pass filter. However, in the case of sampling a continuous signal, the anti-aliasing filter can be either a low-pass filter or a band-pass filter.
A bandpass signal, i.e. a band-limited signal whose minimum frequency is different from zero, can be downsampled avoiding superposition of the spectra if certain conditions are satisfied, see e.g. [1].



























3.如果第2題受挫後立即認為自己速度能力不足，表示你思想空泛不夠精細，思慮不周。
























4.如果你盡信以上的說話，代表你有有輕信的傾向。沒有質疑，做事每每出現遺漏。懂得去質問自己，才會找到細微之處加以下功夫。


































5.如果你一條一條地看到這一條，表示你腦筋不夠靈活，不懂得先看整體得一初步概念才下手。不懂得跳躍思維，即係腦筋唔夠ram。一load多幾part，之前d野就唔記得 or 一跳躍，就無法將打亂次序的內容整合。



















6.識得反省。謙虛。先會理解自己o既能力界限，達到知己。咁先可以發揮到自己有限o既力量。