Frequency

Frequency is the number of occurrences of a repeating event per unit time. It is also referred to as temporal frequency, which emphasizes the contrast to spatial frequency and angular frequency. The period is the duration of time of one cycle in a repeating event, so the period is the reciprocal of the frequency. For example, if a newborn baby's heart beats at a frequency of 120 times a minute, its period – the interval between beats – is half a second (60 seconds (i.e., a minute) divided by 120 beats). Frequency is an important parameter used in science and engineering to specify the rate of oscillatory and vibratory phenomena, such as mechanical vibrations, audio (sound) signals, radio waves, and light.

Definitions

For cyclical processes, such as rotation, oscillations, or waves, frequency is defined as a number of cycles per unit time. In physics and engineering disciplines, such as optics, acoustics, and radio, frequency is usually denoted by a Latin letter f or by the Greek letter or ν (nu) (see e.g. Planck's formula). The period, usually denoted by T, is the duration of one cycle, and is the reciprocal of the frequency f:

Frequency (video game)

Frequency is a music video game developed by Harmonix and published by SCEA. It is the first major release from Harmonix. It was released in November 2001. A sequel titled Amplitude was released in 2003.

Gameplay

In the game, a player portrays a virtual avatar called a "FreQ", and travels down an octagonal tunnel, with each wall containing a musical track. These tracks contain sequences of notes. As the player hits buttons corresponding to the note placement on the track, the "sonic energy" from within is released and the music plays. If the player plays two measures of the track without any errors, the track is "captured" and the music plays automatically until the next pre-determined section of the song. All songs featured in the game are edited for ease of play.

Some tracks are bonus tracks and only open up when all notes are played, allowing the user to pick up "freestyle" points. Powerups are available which allow the immediate capturing of the track or the doubling of points. If a player continually misses notes, their energy meter reduces until the game is over.

Sound

In physics, sound is a vibration that propagates as a typically audible mechanical wave of pressure and displacement, through a medium such as air or water. In physiology and psychology, sound is the reception of such waves and their perception by the brain.

Acoustics

Acoustics is the interdisciplinary science that deals with the study of mechanical waves in gases, liquids, and solids including vibration, sound, ultrasound, and infrasound. A scientist who works in the field of acoustics is an acoustician, while someone working in the field of acoustical engineering may be called an acoustical engineer. An audio engineer, on the other hand is concerned with the recording, manipulation, mixing, and reproduction of sound.

Applications of acoustics are found in almost all aspects of modern society, subdisciplines include aeroacoustics, audio signal processing, architectural acoustics, bioacoustics, electro-acoustics, environmental noise, musical acoustics, noise control, psychoacoustics, speech, ultrasound, underwater acoustics, and vibration.

Sande

Sande may refer to:

Places

People

Sandeé

Sandra Tola Harvey (née Casañas, January 19, 1962 – December 15, 2008), professionally known as Sandée, was an American freestyle music vocalist and an original member of the trio Exposé from 1984 to 1986, along with Alejandra "Alé" Lorenzo and Laurie Miller.

As a solo artist, Sandée released the singles "You're the One" and "Notice Me" (produced by C + C Music Factory), and an album, Only Time Will Tell, featuring the single "Love Desire". "You're the One" peaked at #11 on the Billboard Hot Dance Music/Maxi-Single Sales in 1987 and "Notice Me" peaked at #9 on the Billboard Hot Dance Music/Club Play chart in 1989.

Death and funeral

On December 15, 2008, Sandée was found dead in her Hollywood, Florida, home. The cause of death was determined to be a severe seizure. Services were held for Sandra on Saturday December 20, 2008 at Fred Hunter's funeral home. She was 46.

Discography

Studio albums

Singles

References / Dead Link

External links

Sande society

Sande, also known as zadεgi, bundu, bundo and bondo, is a women's secret society in Liberia, Sierra Leone, Guinea and the Ivory Coast. The Sande society initiates girls into adulthood by rituals including female genital mutilation. It is alleged by its supporters to confer fertility, to instill notions of morality and proper sexual comportment, and to maintain an interest in the well-being of its members throughout their lives.

In addition, Sande champions women's social and political interests and promotes their solidarity vis-a-vis the Poro, a complementary institution for men. The Sande society masquerade is a rare and perhaps unique African example of a wooden face mask controlled exclusively by women – a feature that highlights the extraordinary social position of women in this geographical region.

Geographic extent

The Sande society is found throughout the Central West Atlantic Region, an ethnically plural and linguistically diverse region that lies within the littoral forest zone bounded by the Scarcies River and Cape Palmas. As early as 1668, a Dutch geographer named Olfert Dapper published a description of the "Sandy" society as it existed in the Cape Mount region of Liberia, based on a first-hand account that seems to date from 1628.