Manuel

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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 (Keri Hilson song)

"Energy" is the debut single by American recording artist Keri Hilson. The song was written and produced by The Runaways, consisting of Louis Biancaniello, Sam Watters, Rico Love, and Wayne Wilkins, for her studio album In a Perfect World… (2009).

The track was released as the first single from the singer's debut in the United States on May 27, 2008. Although being released worldwide it initially only charted in New Zealand at number two and only managed to reach top thirty on the U.S. Billboard Hot R&B/Hip-Hop Songs and Hot Dance Club Play charts.

Generally well received by music critics, it was named sixty-first on The Top 144 Songs of 2008 listing by Blender magazine.

Background

"Energy" was written and produced by The Runaways. It was also recorded by The Runaways at Homesite 13 studios in Novato, California. and Hilson stated that she wanted to prove that she can be successful even without collaborations and guest vocalists and so it was announced "Energy" would be released as the next worldwide single following the success of "Knock You Down". The song was released on September 14, 2009 in the UK. On September 25, 2009 she appeared live on breakfast TV show GMTV in the UK where she performed the single. That same day, she appeared on BBC Radio 1's Live Lounge where she performed a stripped version of "Energy" as well as a gospel cover version of "Supernova" originally sung by Mr Hudson and Kanye West.

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

Disco (TV series)

Disco was a pop music program that aired in Germany on the ZDF network from 1971 to 1982. It generally aired on the first Saturday of each month at 7:30PM, each show running 45 minutes. 133 shows were produced. The show was hosted by German actor and comedian Ilja Richter. Its lesser known predecessor on ZDF, 4-3-2-1 Hot & Sweet was aired between 1966 and 1970, presenters included Ilja Richter and Suzanne Doucet. Disco generally served a younger pop-oriented audience compared to ZDF's Hitparade, and until 1972, its main competitor was Beat-Club (originally patterned after the pure live-act show Ready Steady Go! in the UK, from the late-1960s turning more and more into psychedelic music videos made especially for the invited acts), followed by Musikladen, both on ARD.

Repeats of Disco have been aired since 1984 on ZDF Musikkanal, after its closedown in 1989 on 3sat. Since 2004, the digital ZDF Theaterkanal (which is now zdf.kultur) aired repeats of the entire series until 2012. In 2007, ZDF Dokukanal began to air reruns, starting with episodes from 1975 and also multiple repeats of the series have been shown on hit24 in 2008, most recently zdf.kultur began to show the entire series each day in 2013.

Metro Station (album)

Metro Station is the eponymously titled debut length album by pop band Metro Station. The album was released on September 18, 2007 under Columbia/Red Ink.

Four singles were released from the album; "Shake It" and "Seventeen Forever" charted on the Billboard Hot 100. The album debuted at #189 on the U.S. Billboard 200, but reached a peak of #39 in June 2008. The single "Shake It" was certified Platinum in 2008. Since its release, Metro Station has sold approximately 400,000 copies in the United States.

The album was released in the UK on March 30, 2009. The version of the album released in the UK contains 2 exclusive bonus tracks including a brand new track, "After the Fall". The first UK single, "Shake It", was released a week before, on March 23, 2009.

Track listing

All songs written and composed by Metro Station, except "True to Me" by Metro Station, Sam Hollander and Dave Katz. 

Release history

Charts

Personnel

Khud-Daar

Khud-Daar (Hindi: खुद्दार) is a 1982 Indian Hindi movie directed by Ravi Tandon. The music is by Rajesh Roshan and the lyrics by Majrooh Sultanpuri. The film stars Amitabh Bachchan, Parveen Babi, Vinod Mehra, Sanjeev Kumar, Prem Chopra, Mehmood, Bindiya Goswami and Tanuja in pivotal roles. It was remade in Tamil as Padikkadhavan which starred Rajinikanth and in Telugu as Driver Babu with Sobhan Babu.

It was released during the week when Amitabh Bachchan was critically injured while shooting for the film 'Coolie' in Bangalore. The movie ran for packed houses for many weeks and was declared 'Super Hit'.

Plot

Govind (Amitabh Bachchan) and Rajesh (Vinod Mehra) are two brothers who are happy being brought up by their considerably older stepbrother Hari (Sanjeev Kumar). However, when Hari has to leave home for two months to complete his law degree, his newly married wife Seema (Tanuja), jealous of her husband's excessive affection for the two, misbehaves with them, forcing them to leave home and escape to Mumbai.