Description: 单片机正弦信号产生中改变正弦消耗频率时仍然保持采样频率的算法-SCM sinusoidal signal to change consumption frequency sinusoidal remained sampling frequency algorithm Platform: |
Size: 5538 |
Author:王杜 |
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Description: DSB-SC信号的生成与解调 1) 用离散（DSP）的方法生成DSB信号 2) 载波频率为150KHz，音频为500Hz和2000Hz的混合音。 3) 加入高斯白噪声 （4） 语音信号 的传输。 改变抽样频率和量化台阶大小，观察重建信号以及量化噪声信号的波形；对于语音信号主观评价声音质量的变化。 -DSB-SC signal generation and demodulation 1) Discrete (DSP) methods to generate DSB signal 2) the carrier frequency to 150KHz, audio 500Hz and 2000Hz for the mixed tone. 3) by adding white Gaussian noise (4) transmission of voice signals. Change the sampling frequency and quantization step size, to observe the reconstruction of signal and quantization noise signal waveform for subjective evaluation of the speech signal changes in sound quality. Platform: |
Size: 28961 |
Author:doucuole@126.com |
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Description: 单片机正弦信号产生中改变正弦消耗频率时仍然保持采样频率的算法-SCM sinusoidal signal to change consumption frequency sinusoidal remained sampling frequency algorithm Platform: |
Size: 5120 |
Author:王杜 |
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Description: C8051F350单片机的24位AD程序，通过示波器显示字符，使用sin3c滤波器输出，看门狗时间改到相应最短，采样频率下位24hz上位8hz。-C8051F350 MCU 24 AD procedures, through the oscilloscope display characters, the use of sin3c filter output, watchdog time change to the appropriate minimum, the sampling frequency 24Hz lower epistasis 8hz. Platform: |
Size: 139264 |
Author:zxx |
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Description: WLAN仿真－发送机
wlan No Comments
设置完系统参数后，开始产生发送数据。
1. 产生随机的发送bit（tx_bits），这里不考虑信道编码。
2. QAM映射
3. 将数据映射到不同载波，形成OFDM符号
4. 产生pilot，并将pilot插入OFDM符号中
5. 加入dc和guard子载波
6. 进行ifft，将频域信号变到时域，并加入循环前缀
7. 对信号进行overlap window
8. 在时域产生short preamble
9. 在时域产生long preamble
10. 将preamble和数据符号组成packet
11. 升采样
得到信道传输的数据Tx_signal_up
具体程序见附件 wlan_transmitter.m-WLAN Simulation- wlan No Comments transmitter system parameters set finished, the beginning to have to send data. 1. Have sent random bit (tx_bits), here does not consider channel coding. 2. QAM mapping 3. The data is mapped to a different carrier to form OFDM symbols 4. Have a pilot, and pilot inserted OFDM symbols 5. Adding dc and guard subcarriers 6. To carry out ifft, will change the frequency domain signal to time domain, and add cyclic prefix 7. the signals overlap window8. In the time domain have a short preamble9. In the time domain have a long preamble10. the preamble and data symbols packet11. or sampling received data transmission channel Tx_signal_up specific procedures see Annex wlan_transmitter.m Platform: |
Size: 1024 |
Author:福东方 |
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Description: 模拟信号的数字化传输---增量调制系统
用SIMULINK建立简单增量调制系统的模型并进行
（3） 正弦信号
（4） 语音信号
的传输。
改变抽样频率和量化台阶大小，观察重建信号以及量化噪声信号的波形；对于语音信号主观评价声音质量的变化。
-Digitized analog signal transmission systems--- delta modulation delta modulation SIMULINK easy set up of the model system and (3) sinusoidal signal (4) transmission of voice signals. Change the sampling frequency and quantization step size, to observe the reconstruction of signal and quantization noise signal waveform for subjective evaluation of the speech signal changes in sound quality. Platform: |
Size: 6144 |
Author:Ryan |
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Description: DSB-SC信号的生成与解调
1) 用离散（DSP）的方法生成DSB信号
2) 载波频率为150KHz，音频为500Hz和2000Hz的混合音。
3) 加入高斯白噪声
（4） 语音信号
的传输。
改变抽样频率和量化台阶大小，观察重建信号以及量化噪声信号的波形；对于语音信号主观评价声音质量的变化。
-DSB-SC signal generation and demodulation 1) Discrete (DSP) methods to generate DSB signal 2) the carrier frequency to 150KHz, audio 500Hz and 2000Hz for the mixed tone. 3) by adding white Gaussian noise (4) transmission of voice signals. Change the sampling frequency and quantization step size, to observe the reconstruction of signal and quantization noise signal waveform for subjective evaluation of the speech signal changes in sound quality. Platform: |
Size: 28672 |
Author:Ryan |
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Description: 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. Platform: |
Size: 143360 |
Author:leo |
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Description: 改变声音信号采样频率。应分别考虑由低到高和由高到低，最好包括声音采集和回放等功能。-To change the audio signal sampling frequency. Should be considered separately from low to high and high to low, preferably including audio capture and playback functions. Platform: |
Size: 1024 |
Author:马竞 |
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Description: 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, approaching a group of analog filters indicator parameters (pass-band cut-off frequency Wp = 2* pi* 2000rad/s, stop-band edge frequency Ws = 2* pi* 3000rad/s, pass-band ripple Rp = 3db, stop-band attenuation Rs = 15db, the sampling frequency f = 10000Hz) were used to change the impulse response method and bilinear transformation method for design, list and describe the transfer function of analog and digital filter amplitude-frequency and phase-frequency response curve. A filter was designed with the completion of the above-mentioned groups of a given signal filtering, to prove the effectiveness of filters and filter limit Platform: |
Size: 71680 |
Author:刘文珍 |
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Description: 本文通过matlab分析信号在不同采样频率和变换点数的FFT下的频谱图，研究采样频率和变换点数对信号FFT的影响。同时还讨论了信号在不同频带噪声背景下的采样频率和变换点数的选择。-In this paper, matlab sampling frequency of the signal at different points in the FFT and transform under the frequency spectrum, change the sampling frequency and FFT of the signal points. Also discussed the noise signal in the context of different frequency bands and transform points sampling frequency selection. Platform: |
Size: 136192 |
Author:hzz |
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Description: 图像的灰度变换。改变图像输入、输出映射的灰度参数范围(拉伸和反比)，观看图像处理结果。
修改可选参数gamma值，使其大于1，等于1和小于1，观看图像处理结果。
对图像直方图均衡化处理，显示均衡前后的直方图和图像。
图像的数字化参数取样频率(像素个数)、量化级数关系-
Gray-scale transformation of the image. Change the image input and output mapping of the gray-scale range of parameters (tension and inversely proportional to), watching the results of image processing.
Modify the optional parameter gamma value, it is greater than 1, equal to 1 and less than 1, watching the results of image processing.
The image histogram equalization, histogram before and after equalization and image.
Digital parameters of the image sampling frequency (number of pixels) to quantify the progression relationship
Platform: |
Size: 834560 |
Author:汪晨 |
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Description: 在许多的单片机应用系统中，都需要A/D转换器，将模拟量转换成数字量。在STM8单片机中，提供的是10位的A/D，通道数随芯片不同而不同，少的有4个通道，多的则有16个通道。
下面的实验程序首先对A/D输入进行采样，然后将采样结果的高8位（丢弃最低的2位），作为延时参数去调用延时子程序，然后再去驱动LED控制信号。因此不同的采样值，决定了LED的闪烁频率。当旋转ST三合一开发板上的电位器时，可以看到LED的闪烁频率发生变化。
-In many microcontroller applications require the A/D converter to convert analog into digital. STM8 microcontroller, providing a 10-bit A/D channel number with the chip, little has four channels, more than 16 channels. The following experimental procedure first sampling A/D input, then the sampling results 8 (drop the lowest 2), as the delay parameter to call the delay subroutine, and then go drive LED control signal. Different sampling values, the LED flashing frequency. When the potentiometer rotation ST triple development board, you can see the LED flashing frequency change. Platform: |
Size: 4096 |
Author:tony |
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Description: top the acquisition and displays the recognized digit. Beside the length of speech segment it is possible to change also the sampling frequency. Platform: |
Size: 4096 |
Author:Alich |
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Description: 对wav格式的音频实现变采样，可以实现8k采样率到6.4k采样率的转换-Variable sampling to wav format audio implementation, can achieve 8 k sampling rate to 6.4 k sampling rate conversion Platform: |
Size: 7653376 |
Author:李雄 |
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Description: 功率谱估计
信号为两个正弦信号加高斯白噪声，各正弦信号的信噪比均为10dB，长度为N，信号频率分别为 和 ，初始相位 ，取 ， 取不同数值：0.3，0.25。 为采样频率。分别用Levinson递推法和Burg法进行功率谱估计，并分析改变数据长度、模型阶数对谱估计结果的影响。-Power spectrum estimation signal into two sinusoidal signals applied Gaussian white noise, the SNR of each sinusoidal signal are 10dB, a length of N, respectively, and the signal frequency, initial phase, take, take different values: 0.3,0.25. Is the sampling frequency. Levinson recursive method were used and Burg method for power spectrum estimation, and change the length of the data analysis, the impact on the estimation model order spectrum. Platform: |
Size: 1024 |
Author:gongzhizhen |
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Description: MATLAB软件平台下，利用函数wavread对语音信号进行采样，记住采样频率和采样点数；
2）画出语音信号的时域波形，对采样后的语音进行fft变换，得到信号的频谱特性；对语音信号分别加入正弦噪声和白噪声，画出加噪信号的时域波形和频谱图；
3）根据对加噪语音信号谱分析结果，确定滤除噪声滤波器的技术指标，设计合适的数字滤波器，并画出滤波器的频域响应；
4）用所设计的滤波器对加噪的信号进行滤波，在同一个窗口画出滤波前后信号的时域图和频谱图，对滤波前后的信号进行对比，分析信号变化；
-Under the MATLAB software platform, using the function wavread voice signal is sampled, the sampling frequency and sampling points to remember
2) Draw the speech signal in the time domain waveforms were sampled voice fft transform, to obtain the spectral characteristics of the signal voice signals were added to the sinusoidal noise and white noise, plus noise signal when drawn-domain waveform and frequency spectrum
3) According to the speech signal plus noise spectral analysis to determine the filter noise filter specifications, design an appropriate digital filter and draw the filter frequency response
4) Use a filter designed to increase the signal-to-noise filtering, draw before and after filtering the signal in the time domain with a window display and the spectrogram of the signal before and after filtering comparative analyzes signal change Platform: |
Size: 1024 |
Author:张三 |
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Search - sampling frequency change