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

Running (No Doubt song)

"Running" is a song written by Tony Kanal and Gwen Stefani for No Doubt's fifth studio album Rock Steady (2001) and was released worldwide as the album's fourth and final single on July 1, 2003. The song was also used on the last episode of the TV series Sabrina, the Teenage Witch in 2003.

The song received mixed reviews from music critics and was compared to Depeche Mode-style songs. The song only charted on the official charts of the United States, where it became the band's lowest charting single, and in Germany, where it had longest charting period. The song was accompanied by a music video which was directed by Chris Hafner, which featured many old and new pictures as well as clippings of the band members.

Background

The song was written by Stefani and bassist Tony Kanal in Kanal's living room. They used an old Yamaha keyboard that Kanal's father had purchased for him when he was in eighth grade and developed the song's harmony first and then wrote the lyrics. The band worked on the track to give it a "spacier sound" but were displeased with the result so they took the song to producer Nellee Hooper, who stripped Running down to the basics.The song was then produced by him, with whom Stefani collaborated again for her solo project two years later. Whatever the intent, the result was a track that resonated with catchy "Mario Bros." background instrumentation throughout the entire song.

Running (Information Society song)

Running is a single by the band InSoc (Information Society) originally released on the Creatures of Influence album in 1985. The single for Running was distributed to club DJs, and became a favorite all over clubs, particularly in the Latin clubs of New York City. The single was later remixed by Tommy Boy Records and the remix single was released and became even more of a club hit, eventually reaching #2 on the Dance/Club Airplay charts and becoming an enduring classic of the Freestyle genre. Tommy Boy Records signed Information Society in 1986 and their self-titled album soon followed, featuring a mix of the single. In 1988 Information Society's self-titled album was released and went platinum.

Unlike other singles in the catalogue, "Running" does not feature Kurt Harland on lead vocals, as the song was written and recorded by short-lived band member Murat Konar, who left the band in 1985 and would later be an integral part of the development of both SoundEdit (a Mac hosted sound editing application) and Adobe Flash applications. For a very long period of time, the band would not perform "Running" live, requesting not to be asked to play it and generally refusing all questions pertaining to their dislike of the song. It is generally believed this is due to the song being very difficult to play live, and because the song was written at a particularly fractious period in the band's life.

Running (András Kállay-Saunders song)

"Running" is a song by Hungarian American singer András Kállay-Saunders. It was chosen to represent Hungary at the Eurovision Song Contest 2014 in Denmark.

Background

In an interview with Wiwibloggs, András stated that "Running" was inspired by one of his friends that was an abuse victim. He also said that he wanted to bring awareness to this topic through his voice and he would like for abuse victims to know that they don't have to be afraid to speak up and ask for help.

Critical reception

The song's reviews were mostly positive.

With 10 reviews from Wiwibloggs, "Running" received an average of 8.65 out of 10 and was often described as the year's favorite. Wiwi gave the song a rate of 9 and said "Running" has strong vocals and clever production. Angus gave the song a rate of 7.5 and described "Running" was dark, sweeping, and had truly relentless composition. Billy gave the song a rate of 10 and remarked the "touching lyrics". He also said "Running" was his favorite of the year. Bogdan gave the song 9 out of 10 and said "András has brought a serious matter to the Eurovision table". Deban gave the song 9.5 out of 10 and said that András deserved a composer award for capturing social concerns with music. Katie gave the song 8 out of 10 and praised András's vocal performance. Padraig and Patrick both gave "Running" a rate of 9.5 of 10. Sami gave the song a rate of 9 and said that "Running" was one of the strongest songs. Lastly, Vebooboo gave the lowest score for "Running", 6.5 out of 10 and said "there are a couple of times where the song almost builds to a climax, but then it just stops and goes back to the basic refrain".