Description: The Fast Fourier Transform (FFT) allows users to view the spectrum content of an audio signal. The FFT code presented here was written by Don Cross though his homepage appears to have subsequently been taken down. Rather than explain the mathematical theory of the FFT, I will attempt to explain its usefulness as it relates to audio signals-The Fast Fourier Transform (FFT) allows us ers spectrum to view the content of an audio sign al. The FFT code presented here was written by Do n Cross though his homepage appears to have subs equently been taken down. Rather than explain t he mathematical theory of the FFT. I will attempt to explain its usefulness as it re Lates to audio signals Platform: |
Size: 22612 |
Author:冰城 |
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Description: The Fast Fourier Transform (FFT) allows users to view the spectrum content of an audio signal. The FFT code presented here was written by Don Cross though his homepage appears to have subsequently been taken down. Rather than explain the mathematical theory of the FFT, I will attempt to explain its usefulness as it relates to audio signals-The Fast Fourier Transform (FFT) allows us ers spectrum to view the content of an audio sign al. The FFT code presented here was written by Do n Cross though his homepage appears to have subs equently been taken down. Rather than explain t he mathematical theory of the FFT. I will attempt to explain its usefulness as it re Lates to audio signals Platform: |
Size: 22528 |
Author:冰城 |
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Description: the convert the audio from the cep unit fft to mel spectrum-the convert the audio from the probes unit fft t o mel spectrum Platform: |
Size: 2048 |
Author:雷柏英 |
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Description: 这是本人做的一个，基于VB的一个音频文件FFT计算与频谱显示的软件。包括源代码，是个不错的源代码。-This is one I do, based on the VB of an audio file FFT calculation and spectrum display software. Including source code, is a good source code. Platform: |
Size: 6990848 |
Author:余海斌 |
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Description: 采用MATLAB分析WAV文件。
步骤一：选择一个WAV文件作为分析的对象 。（ding.wav）
步骤三：进行 FFT变换并画频域图形 。
步骤四：进行该声波主要频谱的分析。
步骤五：根据该声音的频谱，反演时域图形 。（有失真）
步骤六：进行付立叶逆变换IFFT并画频域图形 。-WAV file analysis using MATLAB. Step One: Select a WAV file as the target of analysis. (Ding.wav) Step Three: Transform and painting to FFT frequency domain graphics. Step four: the main frequency spectrum of the acoustic analysis. Step 5: According to the sound spectrum, inversion of time-domain graphics. (With distortion) Step six: to carry out inverse Fourier transform frequency domain IFFT and painted graphics. Platform: |
Size: 64512 |
Author: |
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Description: 对wav音频进行分析，并进行fft转换，最后生成可视的频谱图-Wav audio for analysis and fft conversion, the final generation of visual spectrum Platform: |
Size: 2471936 |
Author:chobits |
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Description: 2007年全国大学生电子设计大赛，A题音频信号分析仪的全部源程序。
单片机为c8051f120，系统时钟倍频至96MHZ。
main.c是一个包含五级菜单的主函数。
FFT.C是进行fft变换，将时域信号变换成频域信号。
flash.c是读写片外flash存储器的程序,可以将分析结果保存,以备调用.
z7290.c是周立功7290键盘芯片的驱动程序.
FFT_xgjis.c是对变换后的频谱进行分析和运算.
FFT_CodeTable.c是一个正弦表,在FFT的时候调用.
LCD320240.c是320*240的液晶驱动程序,液晶的控制器是SED1335.
所有的.h文件提供了子函数的定义.
本程序用KEIL3 802版本编译通过，将所有的.C文件添加到工程中，并编译main.c
注意两点:1.器件选择c8051f120.
2.在target中将时钟设为96M.同时必须将Memory Model 改成large--XDATA.默认的是small.
因为本设计占用的资源是非常大的.
Program Size: data=81.3 xdata=6811 code=43056-2007 National Undergraduate Electronic Design Contest, A title of the audio signal analyzer full source code. Singlechip c8051f120, system clock multiplier to 96MHZ. main.c is a menu that contains the main function 5. FFT.C is fft transform, time-domain signal will be converted into frequency domain signals. flash.c are reading and writing flash memory chip procedure, the results of the analysis can be preserved, for calling. z7290.c weeks are Ligong 7290 driver keyboard chip. FFT_xgjis.c is transformed spectrum analysis and computing. Sine FFT_CodeTable.c is a table at a time when FFT calls. LCD320240.c are 320* 240 LCD drivers, LCD controllers are SED1335. all. h document provides the definition of Functions. Platform: |
Size: 35840 |
Author:王渔阳 |
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Description: This article describes how to
build simple audio spectrum analyzer based on FFT algorithm using Philips LPC2138
microcontroller. Platform: |
Size: 104448 |
Author:Robert |
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Description: 本音频信号分析仪由32位MCU为主控制器，通过AD转换，对音频信号进行采样，把连续信号离散化，然后通过FFT快速傅氏变换运算，在时域和频域对音频信号各个频率分量以及功率等指标进行分析和处理，然后通过高分辨率的LCD对信号的频谱进行显示。该系统能够精确测量的音频信号频率范围为20Hz-10KHz，其幅度范围为5mVpp-5Vpp，分辨力分为20Hz和100Hz两档。测量功率精确度高达1 ,并且能够准确的测量周期信号的周期，是理想的音频信号分析仪的解决方案。-The audio signal analyzer 32-bit MCU-based controller by the through the AD conversion of the audio signal sampling, the discretization of continuous signals, and then FFT Fast Fourier Transform calculations, in the time domain and frequency domain of audio signals in various frequency indicators such as weight and power analysis and processing, and then high-resolution LCD to display the signal spectrum. The system can accurately measure the audio signal frequency range of 20Hz-10KHz, the magnitude of the range of 5mVpp-5Vpp, resolution is divided into two tranches of 20Hz and 100Hz. Power Measurement accuracy up to 1 , and an accurate measurement of periodic signal cycles, is the ideal audio signal analyzer solution. Platform: |
Size: 197632 |
Author:zhangying |
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Description: 观测实时模拟信号（语音）的频谱
用音频设备采集一段语音，将语音存为.wav格式。对wav文件作分段傅里叶变换分析。语音是分音节的，应把它分段分析，而且实际运用中的数字信号处理的FFT的点数是有限的，一般只能达到千点。用傅里叶反变换IFFT，从频域恢复信号。画出频谱图和语音波形图。
-Observing real-time analog signal (voice) of the spectrum collected with the audio devices section of voice, voice saved as. Wav format. Wav file of the sub-Fourier transform analysis to make. Speech is divided into syllables, it should be sub-analysis, and practical application of digital signal processing of the FFT points is limited, generally only reach 1000 points. Fourier inverse transform IFFT, to restore the signal from the frequency domain. Draw the spectrum map and voice waveform. Platform: |
Size: 63488 |
Author:benny |
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Description: 信号频谱分析
1. 观测已知方波信号、正弦波信号的频谱
分析频率为4KHz、8KHz的占空比为50 的方波信号、正弦波信号的频谱。记录所得频谱图。
观测实时模拟信号（语音）的频谱
用音频设备采集一段语音，将语音存为.wav格式。对wav文件作分段傅里叶变换分析。语音是分音节的，应把它分段分析，而且实际运用中的数字信号处理的FFT的点数是有限的，一般只能达到千点。用傅里叶反变换IFFT，从频域恢复信号。画出频谱图和语音波形图-Signal spectrum analysis 1. Observing a known square-wave signal, sine wave signal frequency spectrum analysis 4KHz, 8KHz for the 50 duty cycle square wave signal, sine wave signal frequency spectrum. The recorded frequency spectrum. Observing real-time analog signal (voice) of the spectrum collected with the audio devices section of voice, voice saved as. Wav format. Wav file of the sub-Fourier transform analysis to make. Speech is divided into syllables, it should be sub-analysis, and practical application of digital signal processing of the FFT points is limited, generally only reach 1000 points. Fourier inverse transform IFFT, to restore the signal from the frequency domain. Draw maps and voice waveform spectrum Platform: |
Size: 94208 |
Author:benny |
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Description: 分析了输入信号的频谱，运用的FFT处理数据，外国人设计的 效果不错-This is an experimental work to monitor a spectrum pattern in radio band, and is a continuous project from Audio Spectrum Monitor. To analyze the spectrum of an input signal, I chose an Atmel AVR microcontroller that used in the Audio Spectrum Monitor to process FFT. When think it easy, it can be thought that sample an input RF signal directly and analyze it will do. However, you will able to recoginize that there are some techinical difficulties from following reasons. Platform: |
Size: 385024 |
Author: |
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Description: 我的毕业设计，关于AVR单片机的fft程序，确实可用，请大家享用吧。是2009年做的，在优酷网上有视频，可以搜索音频频谱音乐盒。- I graduated from the design, on the AVR single-chip FFT procedures, is available, please enjoy. On 2009, in excellent brutal net video, can search the audio spectrum music box.
Platform: |
Size: 2048 |
Author:唐秀程 |
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Description: 这是一个简单的应用，建立了解的Windows音频波形API的基本知识，并得到快速傅立叶变换（FFT）基本掌握。应用程序的特点是：双缓冲图形，采样音频信号源，选择录音源，使用调音台，计算FFT频谱阵列，并绘制采样数据。-This is a simple application built to understand the basics of the Windows Audio WAVE API, and to get a basic grasp on Fast Fourier Transforms (FFTs). Features of the application are: double buffering graphics, sampling an audio source, selecting an audio recording source using the mixer, calculating the FFT spectrum array, and plotting sampled data. Platform: |
Size: 12119040 |
Author:王海光 |
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Description: 采用快速傅立叶变换（FFT)离散傅里叶变换的一种快速算法，来实现音频频谱变化，在32*64双色点阵上显示音频频谱 16分频-A discrete Fourier transform using a fast Fourier transform (FFT) a fast algorithm to achieve changes in the audio spectrum, the audio spectrum 16 is divided in a 32* 64-color dot matrix Platform: |
Size: 50176 |
Author:zhouxu |
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Description: 16K sample FFT based spectrum analyzer based on Deeth s original
code, with print plot, file saving and loading, multiple sample rates,
oscilloscope, average and peak hold, left/right/mono channel selection. Platform: |
Size: 29696 |
Author:guarumo |
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Search - audio spectrum fft