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

Lost (season 1)

The first season of the television series Lost commenced airing in the United States and Canada on September 22, 2004, concluded on May 25, 2005, and contained 25 episodes. It introduces the 48 survivors of a plane that broke apart in mid-air, scattering them on a remote island somewhere in the South Pacific. Forced to work together to survive, they come to realize it is no ordinary island.

The first season aired Wednesdays at 8:00 pm in the United States. In addition to the 25 regular episodes, a special, "Lost: The Journey", was aired on April 27, 2005, between the 20th and 21st episodes of the season. The season was released on DVD as a seven disc boxed set under the title of Lost: The Complete First Season on September 6, 2005 by Buena Vista Home Entertainment.

Crew

The season was produced by Touchstone Television (now ABC Studios), Bad Robot Productions and Grass Skirt Productions and was aired on the ABC Network in the U.S. The executive producers were co-creator J. J. Abrams, co-creator Damon Lindelof, Bryan Burk, Jack Bender and Carlton Cuse with Jesse Alexander and Jeff Pinkner serving as executive consultants. The staff writers were Abrams, Lindelof, Cuse, Alexander, Pinkner, co-executive producer David Fury, supervising producer Javier Grillo-Marxuach, producer Leonard Dick, producers Edward Kitsis & Adam Horowitz, co-producer Jennifer M. Johnson and story editor Paul Dini. Some of the first season's episodes were written or co-written by writers on a freelance basis. The regular directors throughout the season were J. J. Abrams, Jack Bender, Stephen Williams, Tucker Gates, Greg Yaitanes and Kevin Hooks. Its incidental music was composed by Michael Giacchino. Abrams, Lindelof and Cuse served as the season's show runners.

Lost (season 4)

The fourth season of the American serial drama television series Lost commenced airing on the American Broadcasting Company Network in the United States, and on CTV in Canada on January 31, 2008 and concluded on May 29, 2008. The season continues the stories of a group of over 40 people who have been stranded on a remote island in the South Pacific, after their airplane crashed there more than 90 days prior to the beginning of the season. According to Lost's executive producers/writers/showrunners Damon Lindelof and Carlton Cuse, there are two main themes in fourth season: "the castaways' relationship to the freighter folk" and "who gets off the island and the fact that they need to get back".Lost came under scrutiny from critics in its third season, but the fourth season was acclaimed for its flash-forwards, pace and new characters.

The season was originally planned to contain 16 episodes; eight were filmed before the start of the 2007–2008 Writers Guild of America strike. Following the strike's resolution, it was announced that only five more episodes would be produced to complete the season; however, the season finale's script was so long that network executives approved the production of a 14th episode as part of a three-hour season finale split over two nights. The fourth season aired Thursdays at 9:00 pm from January 31 to March 20, 2008 and at 10:00 pm from April 24 to May 15, 2008. The two-hour finale aired at 9:00 pm on May 29, 2008. Buena Vista Home Entertainment released the season on DVD and Blu-ray Disc under the title Lost: The Complete Fourth Season – The Expanded Experience on December 9, 2008 in Region 1; however, it was released earlier—on October 20, 2008—in Region 2.

The End (Lost)

"The End" is the series finale of the ABC television series Lost, consisting of the 17th and 18th episodes of season 6. It is also the 120th and 121st episodes overall. As the final episode, it was first aired in the eastern United States and eastern Canada, and then aired simultaneously in the western United States, western Canada, and eight other countries.

The finale was written by co-creator/executive producer Damon Lindelof and executive producer Carlton Cuse, and directed by executive producer Jack Bender. Unlike the previous season finales, which were two hours long with advertisements, the series finale was expanded by half an hour, running two and a half hours starting at 9 pm Eastern Daylight Time, with a retrospective of the past six seasons running for two hours, starting at 7 pm.

"The End" was watched by 13.5 million Americans and received a strongly polarized response from both fans and critics. Reviewers from the Chicago Tribune and IGN called it the best episode of the season and praised its emotion and character. Negative reviews from the Los Angeles Times and The Philadelphia Inquirer criticized the finale for answering so few of the series' questions. Web site Metacritic gave "The End" a score of 74 out of 100, suggesting "mostly positive reviews", while The Guardian and The Daily Telegraph reported mostly negative reviews.