Energy (signal processing)

In signal processing, the energy of a continuous-time signal x(t) is defined as

the energy of a discrete-time signal x(t) is defined as

Relationship to energy in physics

Energy in this context is not, strictly speaking, the same as the conventional notion of energy in physics and the other sciences. The two concepts are, however, closely related, and it is possible to convert from one to the other:

For example, if x(t) represents the potential (in volts) of an electrical signal propagating across a transmission line, then Z would represent the characteristic impedance (in ohms) of the transmission line. The units of measure for the signal energy would appear as volt²·seconds, which is not dimensionally correct for energy in the sense of the physical sciences. After dividing by Z, however, the dimensions of E would become volt²·seconds per ohm, which is equivalent to joules, the SI unit for energy as defined in the physical sciences.

Spectral energy density

Seven Year Itch (Collective Soul album)

On September 18, 2001, Collective Soul released their greatest hits compilation Seven Year Itch: Greatest Hits, 1994-2001 (stylized as 7even Year Itch). The compilation includes songs recorded from 1994 to 2001 and included two new tracks; "Next Homecoming" and "Energy". Seven Year Itch received decent reviews and was relatively successful It sold 225,000 copies in the first year after its release and reached number fifty on the Billboard 200; in Canada, it reached number nine on its albums chart and went platinum. All the songs in Seven Year Itch had charted in the US on the Billboard Hot 100, Mainstream Rock Tracks, or the Modern Rock Tracks chart, except for "Energy", which debuted in this compilation.

The compilation has sold over 500,000 copies. It saw a resurgence in sales after Collective Soul began putting out albums on their own independent label, El Music Group, beginning in 2004.

Seven Year Itch was the last album Collective Soul released through Atlantic Records and their last album to feature guitarist Ross Childress, who had been with the band since its 1993/1994 debut.

Energy (Drake song)

"Energy" is the second single by Canadian rapper Drake from his fourth commercial release If You're Reading This It's Too Late.

Composition

"Energy" contains samples from Eazy-Duz-It performed by Eazy-E and Ridin Spiners performed by Three 6 Mafia. Energy was produced by Boi-1da and OB O'Brien. According to WhoSampled the song samples the score of an episode of The O.C..

Critical reception

"Energy" received acclaim from music critics with many calling it the best song of the album. Ryan Dombal of Pitchfork gave the song a positive review and named it "Best New Track", stating "The song isn't aimed to any rappers or pop stars, not Kendrick Lamar, Big Sean or Tyga, but the song lines are dangerous."

Music video

Release

The video of "Energy" was released on Apple Music and users with iTunes and registered Apple Music account can watch this video.

Synopsis

Cameo appearance

A cameo role or cameo appearance (/ˈkæmioʊ/; often shortened to just cameo) is a brief appearance or voice part of a known person in a work of the performing arts, typically unnamed or appearing as themselves. These roles are generally small, many of them non-speaking ones, and are commonly either appearances in a work in which they hold some special significance (such as actors from an original movie appearing in its remake), or renowned people making uncredited appearances. Short appearances by celebrities, film directors, politicians, athletes or musicians are common. A crew member of the show or movie playing a minor role can be referred to as a cameo as well, such as Alfred Hitchcock's frequently performed cameos.

History, uses and examples

Originally "cameo role" meant "a small character part that stands out from the other minor parts". The Oxford English Dictionary connects this with the meaning "a short literary sketch or portrait", which is based on the literal meaning of "cameo". More recently, "cameo" has come to refer to any short appearances, whether as a character or as oneself, such as the examples below.

R. Hunter Middleton

Robert Hunter Middleton (May 6, 1898 – August 3, 1985) was an American book designer, painter, and type designer. Born in Glasgow, Scotland he came to Chicago in 1908 where he studied at the School of the Art Institute. He joined the design department of the Ludlow Typograph Company in 1923 and served as director of the department of typeface design from 1933–71. In 1944 he began operating a private press, The Cherryburn Press. He died in Chicago.

Typefaces

All of these foundry types (except Andromaque) were cast by Ludlow Typograph

DJ Cameo

DJ Cameo is an English disc jockey and former host of "Pirate Sessions", a now-defunct Sunday afternoon grime show on the digital UK radio station BBC 1Xtra. He later hosted the Tuesday night UKG show, but on 4th November 2013 it was announced that he would be replaced by a new DJ called Jamz Supernova who would be playing R&B. The music Cameo produces varies from 2-step vocals, to 4x4, to grime, and sublow. In 2004, Cameo was voted winner of the "Best Newcomer" Award for the garage scene's 2004 Peoples Choice Awards held in London. Cameo also received two back to back awards on behalf of Uptown Records, winner of best record shop.

Biography

DJ Cameo began his DJing career in 1997 playing in local bars and clubs in West London. His main influences at that time were Tuff Jam, EZ and the Dreem Teem. In March 1999, Cameo landed a set on London's 92.5 Taste FM alongside MCs Mr. Kaos and Double G, together collectively known as The Specialist Crew and later Special Edition. In their weekly 4pm–6pm Sunday show, they were amongst the early pioneers of a changing scene and introduced the concept of 'radio raving' with 2 MCs effectively 'bringing a rave into your living room'. This allowed Cameo to be heard on the UK underground music scene and to gain experience in working on a radio station. With success on Taste FM, Cameo also featured on other pirate stations such as Delight FM, Ice FM and Lush FM.