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Unverified Commit 517374da authored by Justice's avatar Justice
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initial commit for backup

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      files/voices/first.m 0 → 100644
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      clc
      clear
      pkg load signal
      [X, Fs] = audioread("v3.wav");
      L = length(X);
      Y = fft(X);
      P2 = abs(Y/L);
      P1 = P2(1:L/2+1);
      P1(2:end-1) = 2*P1(2:end-1);
      f = Fs*(0:(L/2))/L;
      f = f(1:21000);
      P1 = P1(1:21000);
      figure(1)
      plot(f,(P1.^2) /L );
      set(gcf,'position',[10,10,1024,720])
      title('Power Spectrum for man sound')
      xlabel('f (Hz)')
      ylabel('Power')
      [W, WFs] = audioread("v10.wav");
      WL = length(W);
      WY = fft(W);
      WP2 = abs(WY/WL);
      WP1 = WP2(1:WL/2+1);
      WP1(2:end-1) = 2*WP1(2:end-1);
      Wf = WFs*(0:(WL/2))/WL;
      Wf = Wf(1:21000);
      WP1 = WP1(1:21000);
      figure(2)
      plot(Wf,(WP1.^2) /WL );
      set(gcf,'position',[1024,720,1024,720])
      title('Power Spectrum for woman sound')
      xlabel('f (Hz)')
      ylabel('Power')
      \ No newline at end of file
      files/voices/sec1.m 0 → 100644
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      %%Time specifications:
      [x, Fs] = audioread("v0.wav");
      dt = 1/Fs; % seconds per sample
      N = length(x);
      %%Fourier Transform:
      X = fftshift(fft(x));
      %%Frequency specifications:
      dF = Fs/N; % hertz
      f = -Fs/2:dF:Fs/2-dF; % hertz
      %%Plot the spectrum:
      figure;
      plot(f,abs(X)/N);
      xlabel('Frequency (in hertz)');
      title('Magnitude Response');
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      \relax
      \providecommand\zref@newlabel[2]{}
      \@writefile{toc}{\contentsline {section}{\numberline {1}تشخیص جنسیت از روی صدا}{1}}
      \@writefile{toc}{\contentsline {subsection}{\numberline {1.1} تجزیه و تحلیل طیفی به کمک تبدیل فوریه}{1}}
      \@writefile{toc}{\contentsline {subsection}{\numberline {1.2} بررسی دو مورد از صدا ها}{1}}
      \@writefile{lof}{\contentsline {figure}{\numberline {1}{\ignorespaces طیف توان برای صدای ضبط شده مرد شماره 3\relax }}{2}}
      \@writefile{lof}{\contentsline {figure}{\numberline {2}{\ignorespaces طیف توان برای صدای ضبط شده زن شماره 10\relax }}{3}}
      \@writefile{toc}{\contentsline {subsection}{\numberline {1.3}اوج صدا}{4}}
      \@writefile{toc}{\contentsline {subsection}{\numberline {1.4}تشخیص جنسیت}{4}}
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      ****************************************************
      *
      * xepersian package (Persian for LaTeX, using XeTeX engine)
      *
      * Description: The package supports Persian
      * typesetting, using fonts provided in the
      * distribution.
      *
      * Copyright (c) 2008--2018 Vafa Khalighi
      *
      * v21.1, 2018/01/28
      *
      * License: LaTeX Project Public License, version
      * 1.3c or higher (your choice)
      *
      * Location on CTAN: /macros/xetex/latex/xepersian
      *
      * Issue tracker: https://github.com/tex-xet/xepersian/issues
      *
      * Support: persian-tex@tug.org
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      ****************************************************
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      . <->"[lmromancaps10-regular]/OT:script=latn;language=DFLT;mapping=tex-text;"
      . - 'slanted' (m/sl) with NFSS spec.:
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      . - 'slanted small caps' (m/slsc) with NFSS spec.:
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      .................................................
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      .................................................
      LaTeX Info: Redefining \latinfont on input line 13.
      LaTeX Warning: Unused global option(s):
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      (./finalrep.aux)
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      LaTeX Font Info: Checking defaults for OML/cmm/m/it on input line 15.
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      LaTeX Font Info: ... okay on input line 15.
      Package caption Info: Begin \AtBeginDocument code.
      Package caption Info: End \AtBeginDocument code.
      \AtBeginShipoutBox=\box43
      LaTeX Font Warning: Font shape `TU/Samim.ttf(0)/bx/n' undefined
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      File: images/aut.png Graphic file (type bmp)
      <images/aut.png>
      [1
      ]
      Missing character: There is no ‏ in font [fonts/Samim.ttf]/OT:script=arab;langu
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      age=FAR;mapping=parsidigits;!
      LaTeX Warning: Reference `pic11' on page 1 undefined on input line 60.
      File: images/man1.pdf Graphic file (type pdf)
      <use images/man1.pdf>
      File: images/woman1.pdf Graphic file (type pdf)
      <use images/woman1.pdf>
      Missing character: There is no ‏ in font [fonts/Samim.ttf]/OT:script=arab;langu
      age=FAR;mapping=parsidigits;!
      [1] [2] [3]
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      [4] (./finalrep.aux)
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      )
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      530636 words of font info for 39 fonts, out of 8000000 for 9000
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      60i,6n,77p,10465b,362s stack positions out of 5000i,500n,10000p,200000b,80000s
      Output written on finalrep.pdf (5 pages).
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      View file @ 517374da
      File added
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      View file @ 517374da
      \documentclass[paper=a4, fontsize=11pt]{article}
      \usepackage{setspace}
      \usepackage{wrapfig}
      \usepackage{caption}
      \usepackage{cleveref}
      \usepackage{graphicx}
      \graphicspath{ {images/} }
      \usepackage{xepersian}
      \settextfont[Path=fonts/]{Samim.ttf}
      \setlatintextfont{Chilanka}
      \begin{document}
      \setstretch{2}
      \begin{titlepage}
      \begin{center}
      \vspace*{1cm}
      \textbf{پروژه امتیازی درس سیگنال‌ها و سیستم‌ها}
      \vspace{0.5cm}
      الگوریتم‌هایی برای پردازش صدا
      \vspace{2cm}
      \textbf{علی فرجی}
      \vspace{2cm}
      استاد درس دکتر مهدی راستی
      \vfill
      \includegraphics[width=0.4\textwidth]{aut}
      دانشکده مهندسی کامپیوتر\\
      بهمن ماه سال 1398
      \end{center}
      \end{titlepage}
      \section{تشخیص جنسیت از روی صدا}
      \subsection{ تجزیه و تحلیل طیفی به کمک تبدیل فوریه}
      تبدیل فوریه یکی از مفید ترین ابزار های ریاضی در زمینه های مختلف علوم و مهندسی است. تبدیل فوریه در پردازش سیگنال، فیزیک، ارتباطات، مباحث نوری ، پردازش صدا و تصویر و خیلی از زمینه های دیگر کاربرد دارد.
      این تکنیک، یک تابع یا مجموعه ای از اطلاعات را از حوزه زمان یا نمونه (sample) به حوزه فرکانس منتقل می کند. این بدان معناست که تبدیل فوریه میتواند بخش فرکانسی را برای یک مجموعه از اطلاعات زمانی نمایش دهد.
      به کمک تبدیل فوریه و نمودار طیف فرکانسی میتوان فرکانس هایی که بیشترین تاثیر را در ساخت سیگنال دارند شناخت و مثلا در موسیقی نت ها و صدا ها را تشخیص داد و یا در طیف سنجی ها مثلا در علم شیمی به عناصر موجود پی برد.
      \subsection{ بررسی دو مورد از صدا ها}
      \ref{pic11}
      همان طور که در اول تعریف پروژه یک نمودار آورده شده است ما نیز با توجه به شکل های بدست آمده به آن پی میبریم مثلا برای مرد شکل 1 حاصل که مطابق با نمودار است زیرا یک پیک بزرگ اطراف 120 و یک پیک کمی کوچکتر اطراف 220 دارد.
      \begin{figure}
      \centering
      \includegraphics[width=\textwidth]{man1}
      \caption{طیف توان برای صدای ضبط شده مرد شماره 3}
      \end{figure}
      همچنین مشاهده می شود (شکل 2) که برای زن فرکانس های بدست آمده اطراف 210 هرتز قدرت بیشتری دارند.
      پس میتوان با استفاده از نقاط ماکسیمم های طیف فرکانس به جنسیت صاحب صدا پی برد.
      \begin{figure}
      \centering
      \includegraphics[width=\textwidth]{woman1}
      \caption{طیف توان برای صدای ضبط شده زن شماره 10}
      \end{figure}
      \subsection{اوج صدا}
      میتوانیم تابع ماکزیمم را روی مقدار اندازه تبدیل فوریه صدا بزنیم تا مقدار اوج را به ما بدهد.
      \subsection{تشخیص جنسیت}
      پس از پیدا کردن اوج و مقدار ایندکس آن میتوان فرکانس آن را حساب کرد سپس میتوان با توجه به مقدار این فرکانس زن یا مرد بودن را تشخیص داد.
      الیته ما چون فقط بر اساس یک ماکزیمم درحال تصمیم گیری هستیم خطای بالایی داریم بهتر است برای بهینه کردن و افزایش دقت مجموعه ای از ماکسیمم ها و مینیمم های محلی را پیدا کنیم و الگوی انها را با الگوی اکسترمم های محلی هر جنسیت تطابق دهیم.
      برای این کار میتوان از تابع \lr{findpeaks} استفاده کرد که در نرم افزار \lr{octave} در پکیج \lr{signal} است.
      \section{ الگوریتم بهبود صدا}
      \end{document}
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