参数资料
| 型号： | AC164120 |
| 厂商： | Microchip Technology |
| 文件页数： | 22/36页 |
| 文件大小： | 0K |
| 描述： | BOARD SIGNAL ANALYSIS PICKIT |
| 标准包装： | 1 |
| 系列： | PICtail™ |
| 主要目的： | 接口，信号分析 |
| 嵌入式： | 是，MCU，8 位 |
| 已用 IC / 零件： | PICkit? PICtail?1 |
| 主要属性： | 实时条形图，示波器，快速傅立叶转换（FFT） |
| 次要属性： | 柱状图 |
| 已供物品： | 板 |
| 产品目录页面： | 658 (CN2011-ZH PDF) |
| 相关产品： | DV164101-ND - KIT DEV PICKIT1 FLASH 8/14PIN |
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Signal Analysis PICtail? Daughter Board User’s Guide
2.6
FFT (FAST FOURIER TRANSFORM)
The FFT displays the Fast Fourier Transformation of the data in the frequency domain.
This display is typically used to analyze AC signals or to help locate the source of AC
noise.
FIGURE 2-11:
FFT DISPLAY
FFT Window Selection
The size of the data set of the FFT analysis determines the resolution and accuracy of
the FFT. The accuracy is equal to:
FFT Accuracy = (4/( n √ N ) dB )
Where:
n = number of converted bits
N = number of data points
In instances where the input signal is not periodic with respect to the sampling fre-
quency of the converter (as is the case with this tool), windowing algorithms are advan-
tageous when looking at FFT results. The windows that are available with the Signal
Analysis Application are the Blackman, Hamming, Hanning and Rectangular. Basically,
an FFT window is multiplied times the measured signal data set taken during the spec-
ified length of time of the conversion. Typically this multiple reduces the magnitude of
the beginning and end of the sample and consequently minimizing discontinuities seen
with the FFT calculation.
Blackman – Window has a bell-shaped characteristic similar to the Blackman-Harris
window. The peak resolution of this window is not as fine as the Hanning, but the
responses flares out less and the rejection of the sidelobes is better.
Hamming – Window has a bell-shaped characteristic. The initial samples from the
conversion data are multiplied by a small number as are the last samples. With this
window, the side lobes adjacent to the main lobes are lower than the results from the
Hanning Window.
Hanning – Window has a bell-shaped characteristic. The initial samples are multiplied
by zero as well a the latest samples. The samples between the beginning and end are
multiplied with the Hanning bell-shape curve. The side lobes of this window are farther
from main lobe as compared to the Hanning Windows. This window is typically used
for harmonic analysis of continuous time signals as well as random noise.
DS51476A-page 18
? 2004 Microchip Technology Inc.
相关PDF资料 |
PDF描述 |
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| AC164121 | BOARD DAUGHTER PICTAIL ETHERNET |
| AC164122 | BOARD DAUGHT PICTAIL SD/MMC CARD |
| AC164123 | BOARD DAUGHTER ETH PICTAIL PLUS |
| AC164124 | BOARD DAUGHTER IRDA PICTAIL PLUS |
| AC164125 | BOARD DAUGHTER PICTAIL SPEECH |
相关代理商/技术参数 |
参数描述 |
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| AC164121 | 功能描述:以太网开发工具 Ethernet PICtail Dghtr Brd RoHS:否 制造商:Micrel 产品:Evaluation Boards 类型:Ethernet Transceivers 工具用于评估:KSZ8873RLL 接口类型:RMII 工作电源电压: |
| AC164121 | 制造商:Microchip Technology Inc 功能描述:IC ((NW)) |
| AC164122 | 功能描述:子卡和OEM板 PICtail Daughter Brd SD/MMC cards RoHS:否 制造商:BeagleBoard by CircuitCo 产品:BeagleBone LCD4 Boards 用于:BeagleBone - BB-Bone - Open Source Development Kit |
| AC164122 | 制造商:Microchip Technology Inc 功能描述:SEMICONDUCTOR ((NW)) |
| AC164123 | 功能描述:以太网开发工具 PICtail Daughter Brd Ethernet Plus RoHS:否 制造商:Micrel 产品:Evaluation Boards 类型:Ethernet Transceivers 工具用于评估:KSZ8873RLL 接口类型:RMII 工作电源电压: |
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