Vietnamese language

Vietnamese ⁱ/ˌviɛtnəˈmiːz/ (tiếng Việt) is an Austroasiatic language that originated in the north of Vietnam and is the national and official language of the country. It is the native language of the Vietnamese (Kinh) people, as well as a first or second language for the many ethnic minorities of Vietnam. As the result of Vietnamese emigration and cultural influence, Vietnamese speakers are found throughout the world, notably in East and Southeast Asia, North America, Australia and Western Europe. Vietnamese has also been officially recognized as a minority language in the Czech Republic.

It is part of the Austroasiatic language family of which it has by far the most speakers (several times as many as the other Austroasiatic languages combined). Vietnamese vocabulary has borrowings from Chinese, and it formerly used a modified set of Chinese characters called chữ nôm given vernacular pronunciation. The Vietnamese alphabet (quốc ngữ) in use today is a Latin alphabet with additional diacritics for tones, and certain letters.

RFI

RFI can mean:

See also

Vietnamese people

The Vietnamese people or the Kinh people (Vietnamese: người Việt (Vietnamese pronunciation: [ŋɨəj˨˩ viət˩]), or người Kinh (Vietnamese pronunciation: [ŋɨəj˨˩ kiɲ˧])), are an Asian ethnic group originating from present-day northern Vietnam and southern China. They are the majority ethnic group of Vietnam, comprising 86% of the population at the 1999 census, and are officially known as Kinh to distinguish them from other ethnic groups in Vietnam. The earliest recorded name for the ancient Vietnamese people appears as Lạc.

Although geographically and linguistically labeled as Southeast Asians, long periods of Chinese domination and influence have placed the Vietnamese culturally closer to East Asians, or more specifically their immediate northern neighbours, the Southern Chinese and other tribes within South China. The word Việt is shortened from Bách Việt, a name used in ancient times. Nam means "south".

Origins

Written history knows the ancient Vietnamese people first simply as the Lạc or Lạc Việt, and the country of Vietnam as Văn Lang. Archaeological evidence of the Đông Sơn culture (also known as Lac Society) suggests that Bronze Age Vietnamese people were among the first to practice agriculture.

Radio

Radio is the use of radio waves is to carry information, such as sound, by systematically modulating some property of electromagnetic energy waves transmitted through space, such as their amplitude, frequency, phase, or pulse width. When radio waves strike an electrical conductor, the oscillating fields induce an alternating current in the conductor. The information in the waves can be extracted and transformed back into its original form.

Radio systems need a transmitter to modulate (change) some property of the energy produced to impress a signal on it, for example using amplitude modulation or angle modulation (which can be frequency modulation or phase modulation). Radio systems also need an antenna to convert electric currents into radio waves, and vice versa. An antenna can be used for both transmitting and receiving. The electrical resonance of tuned circuits in radios allow individual stations to be selected. The electromagnetic wave is intercepted by a tuned receiving antenna. A radio receiver receives its input from an antenna and converts it into a form usable for the consumer, such as sound, pictures, digital data, measurement values, navigational positions, etc. Radio frequencies occupy the range from a 3 kHz to 300 GHz, although commercially important uses of radio use only a small part of this spectrum.