Signal analysis

Probability theory and transform analysis techniques form the backbone of all communication theory.

A function can be represented approximately over a given interval vy a linear combination of members of an orthogonal set of functions.

s(t)≈∑_(n=-∞)^∞▒〖C_n g_n (t)〗

A orthogonal set of functions is a set with the property that a particular operation performed between any two distinct members of the set yields zero. For example, The dot product of any two vectors is zero.

You have learned that vectors are orthogonal if they are at right angles to each other.
This means that one vector has nothing in common with the other.
The projection of one vector onto another is zero.
A function can be considered an infinite-dimensional vector ( think of forming a sequence by sampling the function ), so the concepts from vector spaces have direct application to function spaces.

One such set of orthogonal functions is the set of harmonically related sines and cosines. That is, the functions
sin⁡〖2πf_0 t,〗 sin⁡〖4πf_0 t,〗 sin⁡〖6πf_0 t,…〗
cos⁡〖2πf_0 t,〗 cos⁡〖4πf_0 t,〗 cos⁡〖6πf_0 t,…〗
Form an orthogonal set for any choice of f_0. These functions are orthogonal over the interval between any starting point t_0. and t_0 + 1/f_0.

有心栽花花不開，無心插柳柳成蔭。

表面上看似無相關的事物，背後卻是運用類似的原理在運作。
有心栽花花不開，無心插柳柳成蔭。

....

Dive into yourself to V 把你自己投入...

vaguely adv. 不清晰地; 模糊地; 含糊地; 茫然地
reveal [re·veal || rɪ'vɪːl] v. 露出, 透露, 顯示
stateside adv. 在美國本土 adj. 美國的; 美國本土的
domestic [do·mes·tic || dəʊ'mestɪk] n. 僕人, 傭人; 國貨 adj. 家庭的, 馴服的, 國內的
photomicrography ['fəʊtəmaɪ'krɑgrəfɪ /-'krɒg-] n. 顯微鏡照相術
a bevy of 一團...
trespasser ['tres·pass·er || trespəsə(r)] n. 侵害者; 侵入者; 違反者
poke [pəʊk] v. 戳, 捅;

Is it possible to manufacture a sophisticated wireless-capable device entirely in the United States? That's vaguely the suggestion of Google's jet-black orb, launched last week at the search (and now hardware) giant's I/O event in San Francisco. Now, the Nexus Q is just dying to get undressed, and that's exactly what our iFixit friends have done, revealing each component's country of origin. Perhaps one of the most notable items, the Samsung 16GB moviNAND Flash Memory module, may have been made stateside (Austin, TX), but could also have been produced in Hwaseong, South Korea. Some parts, such as the Ethernet port (China) or optical-out connector (Japan) could only have been imported, as iFixit points out, though others are certainly domestic (a photomicrosensor made in California or Illinois). Ready to dive in yourself to verify those findings? You're not going to want to open this thing up on your own -- there's a bevy of capacitors inside, including one with output in the 400-volt range (a warning label alerts would-be trespassers). You can, however, poke around a bit more at our source link below.

拆解Nexus Q

WASHINGTON -- The United States said Thursday it had lodged a complaint with
the World Trade Organization over "unfair" Chinese duties on cars from the
U.S., adding fresh fuel to bilateral trade tensions.

Lodge:提出
lateral: of a side
bilateral: between each other

tear down
拆除; 扯下

自己檢測聽力

自己檢測聽力:

昨天公司健康檢查，
我看一下聽力的檢查報告
左耳在4000~6000Hz高頻的部分 聲音要大於40分貝才聽得到
自己平常無法感受這種感覺
於是乎我去找了這一首音軌
http://www.youtube.com/watch?v=aA3G8ICpP-E
我先拿一支高感度的全罩式耳機
這個音樂是由低頻(1hz)到高頻(4000hz)
把時間調在4:00左右 這是中頻的地帶 聲音調很小 讓左右耳稍微可以
再開啟windows的音量控制程式 把平衡往要量測的一耳調
然後把時間往後調 最後在07:54到結束的地方 我的左耳就聽不到了
但是07:54把音量平衡往右耳調 卻可以聽到結束

這個音感的損失不知道是甚麼時候開始的…？
忘記是第一年進公司的體檢還是第二年就一直這樣了，
但偏偏我對音質很挑剔，明明聽不到不知道在挑剔甚麼？