Energy (signal processing)

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

the energy E_s 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 E_s would appear as volt2·seconds, which is not dimensionally correct for energy in the sense of the physical sciences. After dividing E_s 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

  • "Energy" 3:36
  • "So Full Of Yourself" 3:36
  • "Energy (Power Mix) 5:20
  • Mary (1994 film)

    Mary is a 1994 dramatised documentary from Australia about Mary MacKillop.

    References

    External links

  • Mary at the Internet Movie Database

  • Mary (Sarkodie album)

    Mary is a live album by Ghanaian rapper Sarkodie. It is the rapper's fourth overall album and the follow-up to his third studio album, Sarkology (2014). The album was released through his imprint Sarkcess Music. It is dedicated to his grandmother who died in 2012. As the executive producer of his project, Sarkodie enlisted Akwaboah to produce and write the album. The live recorded album features guest appearances from Akwaboah, Efya, Mugeez, Obrafour and Chase.

    Background

    Mary is named after Sarkodie's late Grandmother who wanted him to record live music. The album took 2 years to record. Sarkodie worked closely with producer Akwaboah on the LP. In a December 2014 Facebook post, the rapper revealed the album's cover art and said he didn't tweet or talked about it because he needed time and a sound mind to record. Producer Akwaboah told Pulse Ghana that the album will comprise 10 songs including "Success Story", "End Up Falling", "All In You" and "Giant Steps". He also said he wrote eight songs on the album.

    Mary of Rome

    The Apostle Paul's Epistle to the Romans (16:6) mentions a Mary. She is said to have treated Paul with special kindness, and to have "laboured much among" the early Christian community.

    Although it has been conjectured that she is the same person as the Mary mother of John Mark , this is generally considered to be unproven . Most traditions hold that there is nothing more known about her.

    See also

  • Mary, for other famous people named Mary.
  • References

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