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.

Testimony (August Alsina album)

Testimony is the debut studio album by American R&B recording artist August Alsina. It was released on April 15, 2014, by Def Jam Recordings. The album was supported by six singles; "I Luv This Shit" featuring Trinidad James, "Ghetto", "Numb" featuring B.o.B and Yo Gotti, "Make It Home" featuring Jeezy, "Kissin' on My Tattoos" and "No Love (Remix)" featuring Nicki Minaj; along with the promotional single, "Benediction" featuring Rick Ross.

Upon its release, Testimony was met with generally positive reviews from music critics, who praised the whole creativity of the album. The album debuted at number 2 on the Billboard 200, with first-week sales of 67,000 copies in the United States.

Singles

On February 14, 2013, the music video was released for the lead single, "I Luv This Shit" featuring Trinidad James. The song was produced by Knucklehead. It was officially released for digital download on February 19, 2013. The song peaking at number 48 on the US Billboard Hot 100, while peaking at number 13 on the Billboard's Hot R&B/Hip-Hop Songs charts.

Ghetto (Akon song)

"Ghetto" is the second single from American singer/songwriter Akon's debut studio album, Trouble. The single was released on December 21, 2004, exclusively in Latin America and certain countries of Europe. The single peaked at #92 on the Billboard Hot 100. Akon describes the song's lyrics as "a description of the cycle of poverty experienced by those living in poor, inner-city areas. Additionally, it describes the physical and psychological oppression with which these residents must deal on a regular basis." The video for the track was filmed in New Jersey, New Mexico and the Navajo Nation reservation in Arizona.

Song information

Four official versions of the song exist. The main album version is sung entirely by Akon, and features on all versions of the album. The second version is entitled the "International Remix", features an additional rap verse from Ali B & Yes R, and is listed as the main version of the track on the most prominent single formats. The third version is entitled the "US Remix", and features additional vocals from 2Pac and The Notorious B.I.G. This version only features on the promotional version of the song. The fourth version is entitled the "Reggaeton Remix", and features vocals from Ali B, Yes R and Tego Calderon. The song is not available on the iTunes version of the Trouble album. There is also a Spanish version of this song, called "Pueblo libre" by MC Piri. Videos for the International Remix and Reggaeton Remix exist, and both appear on the main single format. This song Ghetto by Akon is covered from the original Ghetto song of Alborosie.

Ghetts

Justin Clarke (born 9 October 1984), better known by his stage name Ghetts (formerly Ghetto) is an English Grime MC, from Plaistow, Newham, East London with Caribbean roots from Jamaica and Grenada. His music has been played on national radio stations such as BBC Radio 1,Kiss 100,BBC Asian Network and BBC Radio 1Xtra. Currently, Ghetts is signed to independent record label Disrupt, and released his debut studio album, Rebel with a Cause, on 9 March 2014. Known for his hard hitting lyrics and intricate rhyme schemes, he is associated and has toured internationally with such acts as Kano and was a member of NASTY Crew.

Musical career

Ghetto was a member of grime collective NASTY Crew, however he left, saying that things had gone "pear shaped" due to the number of people in the group. He later went on to create the grime collective The Movement, including Devlin, Wretch 32, Scorcher, Mercston, Lightning and DJ Unique. Ghetts is a very enthusiastic UK artist who has made a number of well-known songs within the UK Grime scene. In 2008 Ghetts was nominated for a BET award for Best UK Act along with Chipmunk, Giggs and Skepta, in the end Giggs took home the award.