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

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

Energy (Melissa Manchester song)

"Energy" is a song performed by American singer Melissa Manchester, from her 1985 album Mathematics.

Details

The song was arranged by veteran songwriter Greg Mathieson and was released as the second single from the album, following the underperformance of the lead single "Mathematics", MCA hoped to reverse the album's fortune by releasing this Hi-NRG track with an aim for the club market.

Melissa Manchester filmed a videoclip to promote the song, which sees the singer and her band in a sort of industrial-setting stage performing the song.

The single was released on 7" and 12" formats featuring remixes, but it failed to chart either on the Billboard Hot 100 or the dance charts, and failed to chart elsewhere. The b-side to the single was a non-album song, called "So Full Of Yourself", which was co-written by Manchester and Tom Snow and used as the b-side to all 3 singles off the album.

Track listings

Calling (Lose My Mind)

"Calling (Lose My Mind)" is a single by Swedish house producers Sebastian Ingrosso (of Swedish House Mafia) and Alesso featuring American recording artist Ryan Tedder of the band OneRepublic. It was released in Sweden on March 13, 2012 and in the UK on May 27, 2012. Canadian recording artist Matthew Koma assisted the artists in writing the song. The original instrumental version of the track was released on August 31, 2011, under the name "Calling". The song topped the Billboard Hot Dance Club Songs chart and was also a top-ten hit in Australia and the UK. It was featured on Swedish House Mafia's second compilation album Until Now, released on October 22, 2012.

Chart performance

Charts

Year-end charts

Certifications

External links

References

Calling (Taproot song)

"Calling" is the first single released from Taproot's third studio album Blue-Sky Research. Like most of the songs on the album, it is significantly less heavy than their previous singles, and shows more of a standard alternative rock/post-grunge approach.

Music video

The song's music video was directed by Moh Azima.

Charts

Personnel

References

Incomparable

Incomparable is the second studio album by Swedish metal band Dead by April. Production for the album took place after a lineup change of guitarists and vocalists for the band following the release of their self-titled debut. Incomparable was released on September 21, 2011 in the United States and most countries, and on September 26 in the United Kingdom, making it the first album by the band to be released in the US in the same time frame as its European release. The album's first official single, "Within My Heart", was released on May 16, 2011 as an EP containing two additional tracks to be featured on the album. The second single, "Calling", was released on September 4 with an accompanying music video released October 6. The third single, "Lost", was released on September 19, 2011, following the delay of the "Calling" music video.

Like the band's debut album, Incomparable included re-recorded demos as well as brand new tracks. On their debut album, only two out of 16 tracks were new, and the 14 others were re-recorded demo songs. Incomparable, however, has only one re-done demo (which is one of their earliest written tunes: "Lost") while the other 12 songs on the standard edition are new. Two other songs, "Painting Shadows" and "Unhateable", were also remade during the production of the album; the former was made the bonus track and the latter did not make it on the track list but was featured on the B-side of "Within My Heart". Incomparable charted at number two on the Swedish Albums Charts.