MR8740、MR8741_user_manual_eng_20191016H.pdf - 第423页
Index 1 Index Numerics 100BASE-TX .......... .......................... ................. 318 2-Point .................... ...................... ..................... 149 9333 LAN Comm unicator ................. .......…
Appendix 4 FFT Definitions
A26
Linear Predictive Coding (LPC)___________________________________
In the following figure, linear predictive coding is implemented by passing a sam-
ple of the input signal through the prediction filter while altering the filter so as to
minimize errors in the original signal.
Given a time-discrete signal {x
t
} (t is an integer) where the input signal is sam-
pled at interval T, LPC analysis presumes the following relationship between
current sample value x
t
and the value of previous sample p.
However, is an uncorrelated random variable with average value 0 and the
dispersion .
Expression (16) shows how current sample value x
t
can be “linearly predicted”
from previous sample values. If the predicted value of x
t
is actually , expres-
sion (16) can be transformed as follows.
Here,
i
is called the linear predictor coefficient.
For LPC analysis, this coefficient is calculated using the Levinson-Durbin algo-
rithm, and a spectrum is obtained. In this instrument, the order of the coefficient
can be set from 2 to 64. Larger orders reveal fine spectral components, while
small orders reveal the overall spectrum shape.
予測フィルタ
入力信号
予測信号
誤差信号
Error Signal
Prediction Signal
Input Signal
Prediction Filter
(16)
tptpttt
xxxx
2211
}{
t
2
t
x
(17)
t
p
i
itit
t
t
xxx
1
Index
1
Index
Numerics
100BASE-TX .....................................................318
2-Point ...............................................................149
9333 LAN Communicator ..................................334
A
A.A.F .................................................................174
A/B cursors .......................................................120
Acquisition interval ............................................252
Aliasing ............................................................ A16
Analog Trigger ..................................................192
Analysis Modes .........................................262, 293
Analysis modes .................................257, 262, 293
Analysis Starting Point ......................................273
Anti-aliasing filter .............................................. A17
Area ..................................................................224
Attenuation rate .................................................254
Auto correlation function ...................................287
Auto Print ..........................................................111
Auto Save ...........................................................87
Average .............................................................223
Averaging ................................................. 256, A19
B
Beep Sound ......................................................310
Blackman ......................................................... A23
Blackman Harris ............................................... A23
Blackman Harris Window ..................................254
Blackman Window ............................................254
Blank Panel .........................................................36
Blocks in use .....................................................136
C
Calculation No. ..................................................260
Captured Screen Image ......................................85
Change Media .....................................................84
Clamp ..................................................................45
Coherence function ...........................................285
Comment
Print (Channel marker) ..................................113
Communications ...............................................313
Access ..........................................................328
Command Communications ..........................332
Delimiter ....................................................333
Header ......................................................333
Command Port (Port number) ...................... 332
Deleting and Renaming Files ....................... 330
Delimiter ....................................................... 332
Downloading ................................................ 330
Gateway ....................................................... 315
Header ......................................................... 332
Host Name ................................................... 315
IP Address .................................................... 315
Network ........................................................ 314
Subnet Mask ................................................ 315
Connection
Current Measurement .................................... 45
Frequency, number of rotations,
and count Measurement ................................ 41
Temperature Measurement ............................ 42
Voltage Measurement .................................... 39
Connection cord ................................................. 41
Connection Cords .............................................. 39
Conversion Ratio .............................................. 148
Coupling ............................................................. 76
Cross power spectrum ..................................... 283
Cross-correlation function ................................ 288
Cursor Value .................................................... 120
XY Synthetic Waveform ............................... 123
D
Damage ............................................................ 372
Delete ............................................................... 106
Display color
Calculation waveforms ................................. 235
Display Types and Split-Screen Settings ......... 268
Disposing
Lithium Battery ............................................. 384
Downloading .................................................... 330
Duty Ratio ........................................................ 225
E
Entering Numerals ........................................... 144
Entering Text .................................................... 141
Event Count ..................................................... 195
Exponential ...................................................... A23
Exponential averaging ...................................... A19
Exponential window ......................................... 254
external .............................................................. 67
External Control ............................................... 335
External Sampling ............................................ 340
External sampling ............................................... 67
Index
Index
2
F
Fall Time .......................................................... 224
FFT ........................................................... 247, A13
File
Entering units and symbols .......................... 141
File operation
Creating New Folders (New Folder) ............. 105
Opening a folder (Open Folder) ................... 105
Renaming Files & Folders (Rename) ........... 107
Sorting Files (Sort) ....................................... 107
File Size
CSV File ...................................................A3, A4
FFT File ....................................................A2, A4
MEM File ..................................................A2, A3
REC File ...................................................A2, A3
Filter width ........................................................ 195
Flat top window ................................................ 254
Flat-Top ............................................................ A24
Folder
Creating New Folders (Folder to save) .......... 90
Creating New Folders (New Folder) ............. 105
Opening a folder (Open Folder) ................... 105
Format ........................................................ 54, 267
Four Arithmetic Operations (Calculation) ......... 225
Fourier transforms ............................................A13
Frequency ........................................................ 223
Frequency Range ............................................. 251
Frequency range .............................................. 251
Frequency Resolution ...................................... 252
G
Graph ................................................................. 72
Gritch Trigger ................................................... 195
H
Hamming .......................................................... A23
Hamming Window ............................................ 254
Hanning ............................................................ A22
Hanning Window .............................................. 254
High Level ........................................................ 225
Highlight ........................................................... 259
Highlight(phase)
(db) ............................................................... 259
Attenuation rate ............................................ 259
Histogram ................................................. 275, 293
I
Imaging ............................................................ A18
Impulse response ..................................... 284, A14
Input Levels ...................................................... 132
Installation ............................................................ 8
Installing ............................................................... 8
Internal memory ................................................. 53
Internet Browser ............................................... 320
Invert ................................................................ 159
J
Judge ................................................................ 219
Calculation Results (Numerical Value) ......... 218
L
L9197 Connection Cord ............................... 39, 41
L9217 Connection Cord ............................... 39, 41
LAN .................................................................. 314
Level monitor .................................................... 132
Level Trigger .................................................... 193
Linear predictive coding ...................................A26
Linear predictive cording
(Power spectrum density ) ................................ 281
Linear spectrum ................................................ 276
Linear time-invariant systems ...........................A14
Load
File type .......................................................... 85
Logic Channel .................................................... 79
Logic Probe ........................................................ 48
Logic Trigger .................................................... 197
Low Level ......................................................... 225
Low-pass filtering ............................................... 78
LPC ..................................................................A26
LTI system ........................................................A14
M
Magnifying and Compressing ........................... 129
Zoom Function ............................................. 130
Manual Trigger ................................................. 203
Maximal ............................................................ 255
Maximam .......................................................... 255
Maximum Value (Maximum) ............................. 223
Measurable ranges ........................................... 290
Measurable ranges with octave analysis .......... 290
Memory Capacity ............................................. 343
Memory Division ............................................... 241
Minimum Value (Minimum) ............................... 223
Mode ................................................................ 163
Module ........................................36, 161, 352, A10
Mouse
malfunction ................................................... 372
N
NG
EXT .............................................................. 268
Nyquist, Running Spectrum .......................... 268
X-Axis ........................................................... 268
X-unit ............................................................ 268
NPLC ............................................................ 171, 8
Number of analysis points ................251, 265, A15