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画像:Window function (nuttall).png - Wikipedia

画像:Window function (nuttall).png

出典: フリー百科事典『ウィキペディア(Wikipedia)』

共有リポジトリ内のファイルの詳細ページにあるこのファイルの説明は以下の通りです。

ウィキメディア・コモンズの記述

Contents

[edit] Summary

Description

Nuttall window (continuous first derivative) and frequency response

Source

self-made

Date

15-Dec-2005

Author

Bob K

Permission
(Reusing this image)

see below


source: http://en.wikipedia.org/wiki/Window_Function

author: http://en.wikipedia.org/wiki/User:Bob_K

[edit] Matlab commands

N=128;
k=0:N-1;
 
dr = 120;
w = 0.355768 - 0.487396*cos(2*pi*k/(N-1)) + 0.144232*cos(4*pi*k/(N-1)) -0.012604*cos(6*pi*k/(N-1));
 
B = N*sum(w.^2)/sum(w)^2    % noise bandwidth (bins)
 
H = abs(fft([w zeros(1,7*N)]));
H = fftshift(H);
H = H/max(H);
H = 20*log10(H);
H = max(0,dr+H);
 
figure
area(k,w,'FaceColor', [0 .4 .6])
xlim([0 N-1])
set(gca,'XTick', [0 : 1/8 : 1]*(N-1))
set(gca,'XTickLabel','0| | | | | | | |N-1')
grid on
ylabel('amplitude')
xlabel('samples')
title('Window function (Nuttall, continuous derivative)')
 
figure
stem(([1:(8*N)]-1-4*N)/8,H,'-');
set(findobj('Type','line'),'Marker','none','Color',[.871 .49 0])
xlim([-4*N 4*N]/8)
ylim([0 dr])
set(gca,'YTickLabel','-120|-100|-80|-60|-40|-20|0')
grid on
ylabel('decibels')
xlabel('DFT bins')
title('Frequency response (Nuttall, continuous derivative)')

[edit] Licensing

Public domain I, the copyright holder of this work, hereby release it into the public domain. This applies worldwide.

In case this is not legally possible:
I grant anyone the right to use this work for any purpose, without any conditions, unless such conditions are required by law.


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[edit] Improvements

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ファイルの履歴

過去の版のファイルを参照するには、日付/時刻の列にあるリンクをクリックしてください。

日付/時刻解像度利用者コメント
現在の版2005年12月17日 (土) 21:071,048×420 (8 キロバイト)Tiaguito (file size. color source: http://en.wikipedia.org/wiki/Window_Function)
2005年12月17日 (土) 20:481,048×420 (10 キロバイト)Tiaguito (source: http://en.wikipedia.org/wiki/Window_Function author: http://en.wikipedia.org/wiki/User:Bob_K)

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