一切從Concert開始......

bmonkey999

              
                           
                           
                           

yjfnog

劲到爆

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號稱偉大的白色希望，小喇叭手Chet Baker查特．貝克曾是所有白人爵士樂迷的心靈寄託，他是當時極少數能夠和黑人傑出樂手並駕齊驅的白人爵士樂明星,但因為吸毒酗酒的問題，他一生的音樂表現起起落落，這一位西岸酷派爵士樂的代表性人物，以他著名憂鬱浪漫的小喇叭音色，俊俏的外型，表現出他作為爵士樂偶像巨星的魅力,這種俊美白人爵士樂偶像的刻板印象真的把他害慘了，查特．貝克常被評論界低估，當年許多樂評認為他名過其實，音樂上的能力不算特出，這真是大錯特錯，貝克絕對是當時最好的幾位小喇叭手之一，他自己晚年時說過一個故事：「當年查理帕克到洛杉磯演奏，要找一個小喇叭手合作，辦了一次樂手甄選會，西岸所有小喇叭手全部到齊來爭取機會，我一出現，上台奏了兩曲，查禮帕克親自把麥克風抓過來說：各位，甄選結束了。」

　　 除了小喇叭演奏的魅力之外，貝克也以歌唱聞名於世，緩慢,拖曳,近似軟弱無力的唱腔,征服了無數歌迷，與其說他感動了這些樂迷，不如說貝克的演唱裡有一些東西擊中了聽者心中最脆弱的部分。貝克，是爵士樂力史上最值得仔細品味的歌手之一。

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1. What is Radio Frequency Interference (RFI)?

RFI is unwanted electromagnetic energy in the frequency range generally used for radio communications. For conducted phenomena, the frequency ranges of interest are 10kHz. For radiated phenomena, it’s 30MHz to 1Ghz。

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2. Why Be Concerned with RFI?

People must concern themselves with RFI for two reasons: (1) Their equipment must operate properly in the application environment, however it always in the presence of significant levels of RFI, and (2) Their equipment must not emit RFI to make sure not to interferes with RF communications which often vital to health and safety. The necessity for reliable RF communications has given rise to legal regulations ensuring RFI control for electronic equipment

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3. What are the Modes of Propagation of RFI?

RFI is spreaded via radiation (electromagnetic waves in free space) and by conduction over signal lines and AC power systems.
Radiated - One of the most significant contributors to radiated RFI from electronic equipment is the AC power cord. The power cord is often an efficient antenna since its length approaches a quarter wave length for the RFI frequencies p resent in digital equipment and switching power supplies.
Conducted - RFI is conducted over the AC power system in two modes. Common mode (asymmetrical) RFI is present on both the line and neutral current paths with reference to the ground or earth path. Differential mode (symmetrical) RFI is present as a voltage between the line and neutral leads.

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4. What is a Power Line Interference Filter?

With the fast development of today’s world, more electrical energy is being generated at increasing levels of power, and more and more low power energy is being used for the transmission and processing of data. The result is caused increasing noise or interference, which can disrupt and even destroy your electronic devices.
A power line interference filter is a main tool to control conducted RFI both into the equipment (potential equipment malfunction) and out of the equipment (potential interference to other system Elements or RF communication). By controlling the RFI conducted onto the power cord, a power line filter also contributes significantly to the control of radiated RFI.
A power line filter is a multiple-port network of passive components arranged as a dual low-pass filter; one network for common mode attenuation, another network for differential mode attenuation. The network provides attenuation of RF energy in the stop band of the filter (typically above 10kHz), while passing the power current (50-60Hz) with little or no attenuation.