Description: 一种计算语音过零率,短时能量,以及端点检测算法.-A calculation of zero-crossing rate of voice, short-term energy, as well as the endpoint detection algorithm. Platform: |
Size: 1024 |
Author:lgr |
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Description: 对语音信号的进行分帧，短时能量计算，过零检测计算，设置门限-Voice signal on the conduct of sub-frame, short-time energy calculation, zero-crossing detection, the set threshold Platform: |
Size: 1024 |
Author:liguang |
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Description: 自己编写的有关计算过零率以及基音周期的函数-I have written the zero crossing rate and the calculation of a function of pitch period Platform: |
Size: 2048 |
Author:guxiaozhang |
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Description: 本文介绍了一种复合信号测量系统，该系统基于TMS320F2808实现，用来检测和重建复合频率信号中的主次信号。该系统由计算模块、重建模块和通讯模块组成。为了能在实时运行中自适应地确定采样频率，我们采取了“eCAP+AD”的方法，eCAP模块记录下整形后的复合信号的上升沿过零点时间值并估计出主频率，从而使系统能自动地选取合适的采样频率完成AD采样过程。系统采用了4096点的FFT算法，能够实现高达0.25Hz的频率分辨率，相对分辨率达到0.05 。-This paper introduces a measurement system based on TMS320F2808 to realize the detection and reconstruction of the primary and secondary sinusoidal signals in a mixed-frequency signal. This system consists of the calculation module, the reconstruction module and the communication module. In order to self-adaptively determine the suitable sample frequency during the real-time operation, we proposed a eCAP+AD method. The eCAP module records the time of the rising-edge zero-crossing point of the reshaped mixed signals and estimates the value of the max frequency, hence the system automatically selects the right sample frequency to implement the ADC process. By employing the FFT algorithm with 4096 points, it can realize a frequency resolution as high as 0.25Hz with a relative resolution ratio of 0.05 . Platform: |
Size: 17652736 |
Author:王 |
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Description: TMS28335初始化完成之后，
1、 先DDS产生73.35hz的方波。（问流量管固定频率）
2、 乘法器的另一个数字端输入乘数直接给一个固定值（按照5v），系数是固定的就是对应PID输出的那个接口，串行十二位信号输出（需要先定好一个GPIO接口）。
3、 再延迟一定的时间0.1s或其他时间之后，开始ad采集信号，分别采两路AD信号，此时不稳定（为什么要等到一定的幅值才开始采集AD信号）
4、 选择250点估计一个频率，频率估计的方法采用计算峰值次数的方法或者过零点，总之是为了保证精度采用时域估计的算法，这一块主要是一个扫频子程序，计算频率共振点。
5、 之后改变DDS的输出频率，循环对512点的数据进行扫频的处理
6、 频率控制完成之后，就可以缓慢降低PID控制输出的参数，此时暂时不计算频率，通过不断调整系数使AB的幅度保持在1 的范围内。
7、 测试幅度控制稳定之后a、采用幅度和频率同时控制b。采集数据进入频率估计和相位差估计的后续程序的大循环
8、 注意：采样和控制是同时进行的，所以要设置中断，以及看懂AD的程序，以及内部存储以及数据处理资源的分配。
-TMS28335 initialization is complete,
1, the first DDS generated square wave of 73.35hz. (Q flow tube fixed frequency)
2, another digital side of the multiplier input multiplier directly to a fixed value (in accordance with 5v), the coefficient is fixed corresponding PID output interface, serial twelve signal output (need to be a good one GPIO interface).
3, and then after a certain time delay 0.1s or other time, ad signal acquisition were collected two AD signal instability (Why wait until a certain amplitude began collecting AD signal)
4, 250 point estimate a frequency, frequency estimation method using the method of calculation of the number of peak or zero crossing, in short, in order to ensure the accuracy of time-domain estimation algorithm, this piece is a sweep subroutine to calculate the frequency resonance point.
5, after the change of the output frequency of the DDS data of 512 points, the loop processing Sweep
6, after the completion of the frequency control, it can sl Platform: |
Size: 164864 |
Author:kiss |
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Description: We propose a position sensorless control scheme for a four-switch, three-phase brushless DC motor drive, based on
the zero crossing point detection of phase back-EMF voltages using newly defined error functions (EFs). The commutation instants
are 30° after detected zero crossing points of the EFs. Developed EFs have greater magnitude rather than phase or line
voltages so that the sensorless control can work at a lower speed range. Moreover, EFs have smooth transitions around zero
voltage level that reduces the commutation errors. EFs are derived the filtered terminal voltages vao and vbo of two low-pass
filters, which are used to eliminate high frequency noises for calculation of the average terminal voltages. The feasibility of the
proposed sensorless control is demonstrated by simulation and experimental results.-We propose a position sensorless control scheme for a four-switch, three-phase brushless DC motor drive, based on
the zero crossing point detection of phase back-EMF voltages using newly defined error functions (EFs). The commutation instants
are 30° after detected zero crossing points of the EFs. Developed EFs have greater magnitude rather than phase or line
voltages so that the sensorless control can work at a lower speed range. Moreover, EFs have smooth transitions around zero
voltage level that reduces the commutation errors. EFs are derived the filtered terminal voltages vao and vbo of two low-pass
filters, which are used to eliminate high frequency noises for calculation of the average terminal voltages. The feasibility of the
proposed sensorless control is demonstrated by simulation and experimental results. Platform: |
Size: 413696 |
Author:ali |
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Description: 该系统基于TMS320F2808实现，用来检测和重建复合频率信号中的主次信号。该系统由计算模块、重建模块和通讯模块组成。为了能在实时运行中自适应地确定采样频率，我们采取了“eCAP+AD”的方法，eCAP模块记录下整形后的复合信号的上升沿过零点时间值并估计出主频率，从而使系统能自动地选取合适的采样频率完成AD采样过程。系统采用了4096点的FFT算法，能够实现高达0.25Hz的频率分辨率，相对分辨率达到0.05%。(The system is based on TMS320F2808 to detect and reconstruct primary and secondary signals in composite frequency signals. The system consists of a calculation module, a reconstruction module and a communication module. In order to run in real-time to adaptively determine the sampling frequency, we adopt "eCAP+AD" method, the rise of eCAP composite signal module record after shaping along the zero crossing time and estimates the value of the main frequency, so that the system can automatically select the appropriate sampling frequency to AD sampling process. The system adopts 4096 point FFT algorithm, which can achieve up to 0.25Hz frequency resolution, and the relative resolution is 0.05%.) Platform: |
Size: 25147392 |
Author:destyni
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Search - a calculation of zero crossing