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Sox是最为著名的Open Source声音文件格式转换工具。已经被广泛移植到Dos、windows、OS2、Sun、Next、Unix、Linux等多个操作系统平台。Sox项目是由Lance Norskog创立的,后来被众多的开发者逐步完善,现在已经能够支持等多种声音文件格式和声音处理效果。基本上常见的声音格式都能够支持。更加有用的是,Sox能够进行声音滤波、采样频率转换,这对那些从事声讯平台开发或维护的朋友非常有用。当然,Sox里面也包括一些DSP算法,有兴趣的朋友可以下载回去研究。Sox可
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数字音频格式有很多种,其质量与采样频率和采样精度两个参数有关。频率的表示单位为赫兹〔Hz〕,它表示每秒采样次数。采样频率越高,音质就越好。采样精度为每次采样所存储的数据数量,它决定每个数字信号所能够表示的离散振幅的数量。存储每个样本的数据越多,音质就越好。但是高品质的声音需要占用大量的内存和磁盘空间。考虑到网络带宽,在Internet连接上传输就需要花费很长的时间。对于Applet来说,保证声音文件的最小化是极为重要的。-digital audio format there are many,
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计算ARMA(p,q)模型的功率谱密度。
形参说明:
b——双精度实型一维数组,长度为(q+1),存放ARMA(p,q)模型的滑动平均系数。
a——双精度实型一维数组,长度为(p+1),存放ARMA(p,q)模型的自回归系数。
q——整型变量,ARMA(p,q)模型的滑动平均阶数。
p——整型变量,ARMA(p,q)模型的自回归阶数。
sigma2——双精度实型变量,ARMA(p,q)模型白噪声激励的方差。
fs——双精度实型变量,采样频率(Hz)。
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由于在Windows2000下右键点击RIFF (*.avi,*.wav) 类型的文件,在摘要里没有该文件的具体信息,所以我就编了一个小程序,用来显示该类型文件的信息。具体信息主要包含视频流和音频流信息。视频流信息主要有:(1)Total frames (2)Frame rate (3)Codec (4)视频的宽度和高度等。音频信息主要有:(1)音频的格式 (2)单声道还是立体声 (3)采样频率等。-in Windows2000 Right click RIFF (*. avi, *. wav)
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该程序用于采样频率的转化,使用visualdsp++开发环境开发的。-procedures for the sampling frequency conversion, the use VisualDSP development of the development environment.
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1IC网友 做的硬盘MP3资料公开
该播放器使用了美国atmel公司出品的mp3播放器专用芯片at89c51snd1c.
本芯片特性如下:
1)MCS51内核,可以利用单片及开发软件Keil软件方便开发mp3播放器,无需特殊软件平台;
2)MPEG I/II-Layer 3 hardware decoder
.独立MP3 Decoder
.支持48,44.1,32,24,22.05,16khz取样频率
.支持软件31阶音量控制,高中低音均衡控制
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ECGSYN generates a synthesized ECG signal with user-settable mean heart rate, number of beats, sampling frequency, waveform morphology (P, Q, R, S, and T timing, amplitude,and duration), standard deviation of the RR interval, and LF/HF ratio (a measu
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改变声音信号采样频率的matlabt程度-Change the voice signal sampling frequency matlabt the extent of
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this program uses an impulse train, takes formant frequencies and filters them. output signal is synthesized sound.
commented part ,controls time=d, sampling frequency=fs
normal frequency=f
and bits=n, then synhesizes the output sound
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scr ipt for performance measurements for Carrier and Sampling Frequency
Offset Correction in OFDM Systems
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We have to design a second order Butterworth filter having a sampling frequency of 20 kHz and -3db cut of frequency at 2 kHz in visual C. Only low frequency signals can pass through this filter and the signals having the frequency higher than frequen
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巴特沃斯低通滤波器的MFC程序,FS是采样频率,fp是截止频率,大家-Butterworth low-pass filter MFC process, FS is the sampling frequency, fp is the cut-off frequency, we take a look at
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改变原始wav音频信号的抽样频率,并且显示处理前后声音信号的频谱.有助于帮助大家理解奈圭斯特抽样定理。-Change the original wav audio signal sampling frequency, and shows the spectrum of sound signal before and after treatment. Helps to help you understand the Nyquist sampling theorem.
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设计一个IIR数字低通滤波器, 逼近一组模拟滤波器的指标参数(通带截止频率Wp=2*pi*2000rad/s,阻带边界频率Ws=2*pi*3000rad/s,通带波纹 Rp=3db, 阻带衰减Rs=15db, 采样频率f=10000Hz); 分别用脉冲响应不变法和双线性变换法实现设计,列出传递函数并描绘模拟和数字滤波器的幅频和相频响应曲线。用上述设计滤波器完成几组给定信号的滤波,证明滤波器的有效性和滤波范围限制.-Design a IIR digital low-pass filter, app
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Multirate滤波器设计。模拟带通信号频率范围1KHz—1.1KHz,设计一个采样频率8KHz数字频谱分析系统,要求频率分辨率0.1Hz。-Multirate filter design. Analog bandpass signal frequency range 1KHz-1.1KHz, design a sampling frequency of 8KHz digital spectrum analysis system, required frequency resolution o
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通过AD采样测量频率,输出到数码管显示,测量低频效果并不好-Measured by AD sampling frequency, the output to a digital display, measuring low-frequency effect is not good
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For a function that varying with time s(t) be a continuous function to be sampled, and sampling be performed by measuring the value of continuous function every T seconds, which is called sampling interval. This sampled function is given by S(nT),for
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在不同采样频率下,对已知信号进行采样和滤波,本文附录了MATLAB程序及仿真结果。-At different sampling frequency, the sampled signal is sampled and analyzed, and the MATLAB program is introduced in this paper.
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给出原始信号,用不同采样频率对信号进行采样,得出波形图-Given the original signal, with a different sampling frequency signal is sampled waveform obtained
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分析带通采样定理的原理和实现过程,说明带通信号重构原始信号的方法,仿真给出不同采样频率和低通采样性能对比-By analyzing the principle and implementation process of the bandpass sampling theorem, the method of reconstructing the original signal with the signal is explained, and the performance comparison
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