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

Kawasaki (surname)

Kawasaki is a surname of Japanese origin (most commonly 川崎, but also 川﨑, 川嵜, 河崎, etc.) .

Notable people surnamed Kawasaki

Kawasaki motorcycles

Kawasaki motorcycles are manufactured by the Motorcycle & Engine division of Kawasaki Heavy Industries at plants in Japan, USA, Philippines, Indonesia and Thailand.

History

Kawasaki Aircraft initially manufactured motorcycles under the Meguro name, having bought an ailing motorcycle manufacturer, Meguro Manufacturing with whom they had been in partnership. Later formed Kawasaki Motor Sales. Some early motorcycles display an emblem with "Kawasaki Aircraft" on the fuel tank.

During 1962, Kawasaki engineers were developing a four-stroke engine for small cars which ended in 1962 when some of the engineers transferred to the Meguro factory to work on the Meguro K1 and the SG, a single cylinder 250 cc OHV. In 1963, Kawasaki and Meguro merged to form Kawasaki Motorcycle Co.,Ltd. Kawasaki motorcycles from 1962 through 1967 used an emblem which can be described as a flag within a wing.

Work continued on the Meguro K1, a copy of the BSA A7 500 cc vertical twin. and on the Kawasaki W1. The K2 was exported to the U.S. for a test in response to the expanding American market for four-stroke motorcycles in which case it was rejected for a lack of power but by the mid-1960s, Kawasaki was finally exporting a moderate number of motorcycles. The Kawasaki H1 Mach III in 1968, along with several enduro-styled motorcycles to compete with Yamaha, Suzuki and Honda, increased sales of Kawasaki units.

List of minor planets: 6001–7000