WordNet

develop into a distinctive entity; "our plans began to take shape" (同)take form, take shape, spring
assume a form or shape; "the water formed little beads"
the visual appearance of something or someone; "the delicate cast of his features" (同)shape, cast
a mold for setting concrete; "they built elaborate forms for pouring the foundation"
a particular mode in which something is manifested; "his resentment took the form of extreme hostility"
a perceptual structure; "the composition presents problems for students of musical form"; "a visual pattern must include not only objects but the spaces between them" (同)shape, pattern
(biology) a group of organisms within a species that differ in trivial ways from similar groups; "a new strain of microorganisms" (同)variant, strain, var.
the phonological or orthographic sound or appearance of a word that can be used to describe or identify something; "the inflected forms of a word can be represented by a stem and a list of inflections to be attached" (同)word form, signifier, descriptor
a printed document with spaces in which to write; "he filled out his tax form"
an ability to perform well; "he was at the top of his form"; "the team was off form last night"
an arrangement of the elements in a composition or discourse; "the essay was in the form of a dialogue"; "he first sketches the plot in outline form"
to compose or represent:"This wall forms the background of the stage setting"; "The branches made a roof"; "This makes a fine introduction" (同)constitute, make
create (as an entity); "social groups form everywhere"; "They formed a company" (同)organize, organise
an undulating curve (同)undulation
a persistent and widespread unusual weather condition (especially of unusual temperatures); "a heat wave"
set waves in; "she asked the hairdresser to wave her hair"
a movement like that of a sudden occurrence or increase in a specified phenomenon; "a wave of settlers"; "troops advancing in waves"
one of a series of ridges that moves across the surface of a liquid (especially across a large body of water) (同)moving ridge
(physics) a movement up and down or back and forth (同)undulation
the act of signaling by a movement of the hand (同)waving, wafture
a hairdo that creates undulations in the hair
something that rises rapidly; "a wave of emotion swept over him"; "there was a sudden wave of buying before the market closed"; "a wave of conservatism in the country led by the hard right"
a member of the womens reserve of the United States Navy; originally organized during World War II but now no longer a separate branch
having or given a form or shape

PrepTutorEJDIC

〈C〉〈U〉(色・材質に対して)『形』,形状,姿 / 〈C〉『人体』,体つき / 〈C〉〈U〉『外観』,格好,人影 / 〈C〉〈U〉(ものの現れる)『形態』,形式 / 〈C〉(生物などの)『種類』,品種 / 〈U〉(芸術作品の)表現形式 / 〈U〉(特にスポーツで)(競技者の)フォーム / 〈U〉(心身の)調子,元気 / 〈C〉(印刷された)書き込み用紙,ひな形 / 〈U〉《話》(ある集団などの)やり方,仕方,方式 / 〈C〉〈U〉しきたり,伝統的な儀式 / 〈C〉(英国の学校・米国のある学校で)学年,学級 / 〈U〉〈C〉(意味に対する)形態,形;語形 / 〈C〉(通例寄りかかりのない)長い木のいす / 〈素材〉‘に'形を与える,(…に)…‘を'形作る《+『名』+『into』+『名』》 / (素材から)…‘を'形作る《+『名』+『out of』+『名』》 / …‘を'組織する,構成する / 〈考えなど〉‘を'まとめる,思い付く;〈計画など〉‘を'立てる / 〈習慣など〉‘を'身に付ける;〈交際など〉‘を'結ぶ / 〈文章など〉‘を'組み立てる;〈複数形など〉‘を'作る / (ある順序に)配列する,整列させる / 〈物が〉形を成す / 生じる,現れる / (…に)なる《+『into』+『名』》
(前後左右・上下に)『揺れる』,ひらめく,ひらひらする / (波形に)『起伏する』,うねる / (手・旗などを振って)『合図する』,手を振る;(…のために,…に向かって)手を振る《+in(to, at)+名》 / (に向かって)‘…を'振る,揺り動かす,ひらめかす《+名+at+名》 / 《方向を表す副詞[句]を伴って》(手・旗などを振って)〈人〉‘に'『合図する』 / ‘…を'起伏させる,うねらせる:〈頭髪〉‘を'ウエーブさせる / 『波』,波浪 / (…の)『波のような動き』,うねり《+of+名》 / (感情・景気などの一時的な)高まり,強まり;(寒暑の)急激な波《+of+名》 / (手・旗などを)振ること,振ってする合図;(…を)振ること《+of+名》 / (髪の)縮れ,ウエーブ / (光・音・電気などの)波
《時間・距離》『…の間』 / 《利益・貢献》『…のために』 / 《適応・用途》『…向きの(に);』…用の(に);…のための(に) / 《目的・意向》『…のために,』に / 《敬意・記念》『…のために;』…を記念して / 《獲得・追求》『…を得るために』,を求めて / 《行く先・方向》『…あてに;』…[方面]行きの,に向けて / 《交換・報償など》『…に対して』;…と引き換えに;…のお返しに / 《原因・理由》『…のために』,なので / 《代理・代表》『…の代わりに;』…を代表して / 《形容詞の後に用いて》『…にとって,』には / 《比較級の後に用いて》『…の結果として,』…のために / 《対比》『…としては,』のわりには / 《関連》『…について,』の点では / 《資格・属性》『…として』 / 《賛成・支持》…『に賛成して』,を支持して / 《傾向・好み》…『に対する』,には / 《模倣》《おもに米》《英文》…の名を取って(after) / 《割合》…に対して / 《『for』+『名』〈人〉+『to』 doの形で,〈人〉が不定詞to doの意味上の主語を表して》…が(…することは,…するために) / […というのは]…だから

Wikipedia preview

出典(authority):フリー百科事典『ウィキペディア（Wikipedia）』「2014/03/11 21:58:56」(JST)

wiki en

[Wiki en表示]

For other uses, see Waveform (disambiguation).

Sine, square, triangle, and sawtooth waveforms

A sine, square, and sawtooth wave at 440 Hz

A composite waveform that is shaped like a teardrop.

A waveform is the shape and form of a signal such as a wave moving in a physical medium or an abstract representation.

In many cases the medium in which the wave is being propagated does not permit a direct visual image of the form. In these cases, the term 'waveform' refers to the shape of a graph of the varying quantity against time or distance. An instrument called an oscilloscope can be used to pictorially represent a wave as a repeating image on a screen. By extension, the term 'waveform' also describes the shape of the graph of any varying quantity against time.^{[citation needed]}

Examples of waveforms[edit]

Common periodic waveforms include (t is time):

Sine wave: sin (2 π t). The amplitude of the waveform follows a trigonometric sine function with respect to time.
Square wave: saw(t) − saw (t − duty). This waveform is commonly used to represent digital information. A square wave of constant period contains odd harmonics that fall off at −6 dB/octave.
Triangle wave: (t − 2 floor ((t + 1) /2)) (−1)^{floor ((t + 1) /2)}. It contains odd harmonics that fall off at −12 dB/octave.
Sawtooth wave: 2 (t − floor(t)) − 1. This looks like the teeth of a saw. Found often in time bases for display scanning. It is used as the starting point for subtractive synthesis, as a sawtooth wave of constant period contains odd and even harmonics that fall off at −6 dB/octave.

Other waveforms are often called composite waveforms and can often be described as a combination of a number of sinusoidal waves or other basis functions added together.

The Fourier series describes the decomposition of periodic waveforms, such that any periodic waveform can be formed by the sum of a (possibly infinite) set of fundamental and harmonic components. Finite-energy non-periodic waveforms can be analyzed into sinusoids by the Fourier transform.^{[relevant? – discuss]}

References[edit]

External links[edit]

Wikimedia Commons has media related to Waveforms.

Collection of single cycle waveforms sampled from various sources

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Japanese Journal

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