JPS6459454A - Method and device for fourier transformation - Google Patents

Method and device for fourier transformation

Info

Publication number
JPS6459454A
JPS6459454A JP62215411A JP21541187A JPS6459454A JP S6459454 A JPS6459454 A JP S6459454A JP 62215411 A JP62215411 A JP 62215411A JP 21541187 A JP21541187 A JP 21541187A JP S6459454 A JPS6459454 A JP S6459454A
Authority
JP
Japan
Prior art keywords
oscillating waveform
sampling
storage part
stored
oscillating
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP62215411A
Other languages
Japanese (ja)
Inventor
Osami Matsushita
Kiyouji Takagi
Mitsuo Yoneyama
Toyomi Sugaya
Ryoichi Kaneko
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hitachi Ltd
Original Assignee
Hitachi Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP62215411A priority Critical patent/JPS6459454A/en
Publication of JPS6459454A publication Critical patent/JPS6459454A/en
Pending legal-status Critical Current

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Abstract

PURPOSE:To speed up a processing, by updating a first oscillating waveform value stored in a storage part to the latest sampled oscillating waveform value and performing operation based on the difference between the updated oscillating waveform value and said first oscillating waveform value by an arithmetic processing part. CONSTITUTION:When data is continuously fetched at every oscillating waveform sampling time, contents stored in the storage part are x0, x1,...xN-1, and xN before sampling of a certain oscillating waveform and are x1, x2,...xN, and xN+1 after sampling. That is, x0 is removed from the contents of stored oscillating waveform values and xN+1 is added to those at the time of sampling the oscillating waveform. Since data x1-xN are left in the storage part, Fourier transformation is executed and added xN+1 and removed x0 to perform the operation in accordance with a simple transformation equation. Thus, the processing speed is increased.
JP62215411A 1987-08-31 1987-08-31 Method and device for fourier transformation Pending JPS6459454A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP62215411A JPS6459454A (en) 1987-08-31 1987-08-31 Method and device for fourier transformation

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP62215411A JPS6459454A (en) 1987-08-31 1987-08-31 Method and device for fourier transformation

Publications (1)

Publication Number Publication Date
JPS6459454A true JPS6459454A (en) 1989-03-07

Family

ID=16671881

Family Applications (1)

Application Number Title Priority Date Filing Date
JP62215411A Pending JPS6459454A (en) 1987-08-31 1987-08-31 Method and device for fourier transformation

Country Status (1)

Country Link
JP (1) JPS6459454A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19827480C2 (en) * 1997-11-20 2002-04-11 Lg Philips Lcd Co Cassette that can be loaded with glass substrates
DE19781572C2 (en) * 1996-02-06 2002-08-14 Asyst Technologies Substrate support device and substrate carrier for a substrate housing

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS55151279A (en) * 1979-05-14 1980-11-25 Tech Res & Dev Inst Of Japan Def Agency Digital beam former
JPS628269A (en) * 1985-06-28 1987-01-16 トムソン　セーエスエフ Apparatus for calculating moving window discrete fourier transform and radar system utilizing the same

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS55151279A (en) * 1979-05-14 1980-11-25 Tech Res & Dev Inst Of Japan Def Agency Digital beam former
JPS628269A (en) * 1985-06-28 1987-01-16 トムソン　セーエスエフ Apparatus for calculating moving window discrete fourier transform and radar system utilizing the same

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19781572C2 (en) * 1996-02-06 2002-08-14 Asyst Technologies Substrate support device and substrate carrier for a substrate housing
DE19827480C2 (en) * 1997-11-20 2002-04-11 Lg Philips Lcd Co Cassette that can be loaded with glass substrates

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