Telex Integrated Signal Processor ISP-100 Manual de usuario Pagina 90
- Pagina / 146
- Tabla de contenidos
- SOLUCIÓN DE PROBLEMAS
- MARCADORES
Valorado. / 5. Basado en revisión del cliente
8-20
10 July 1998
A properly implemented 2-way, 12 dB/octave Linkwitz-Riley
crossover is characterized by:
•2
nd
-order Linkwitz-Riley (Butterworth-Squared) lowpass filter, -6
dB magnitude response at crossover frequency
•2
nd
-order Linkwitz-Riley (Butterworth-Squared) highpass filter,
-6 dB magnitude response at crossover frequency
• polarity of highpass band opposite that of lowpass band
In a 4-way crossover the bands associate in non-obvious ways
(see Sum-to-Allpass Characteristics of Linkwitz-Riley
Crossovers). As expected, the polarity reference for the low-mid
band is the low band, and the polarity reference for the high
band is the mid-high band. However, the polarity reference for
the mid-high band is unexpectedly the low band, rather than the
adjacent low-mid band. Thus, if a 12 dB/octave filter is used for
LP
1
and HP
1
, then the low-mid band must be out-of-phase with
the low band. If a 12 dB/octave filter is used for LP
3
and HP
3
,
then the high band must be out-of-phase with the mid-high band.
And if a 12 dB/octave filter is used for LP
2
and HP
2
, then the mid-
high band must be out-of-phase with the low band, not the low-
mid band.
A properly implemented 2-way 24 dB/octave Linkwitz-Riley
crossover is characterized by:
•4
th
-order Linkwitz-Riley (Butterworth-Squared) lowpass filter, -6
dB magnitude response at crossover frequency
•4
th
-order Linkwitz-Riley (Butterworth-Squared) highpass filter,
-6 dB magnitude response at crossover frequency
• polarity of high band the same as that of low band
In a 4-way crossover the bands associate in non-obvious ways
(see Sum-to-Allpass Characteristics of Linkwitz-riley
Crossovers). As expected, the polarity reference for the low-mid
band is the low band, and the polarity reference for the high
band is the mid-high band. However, the polarity reference for
the mid-high band is unexpectedly the low band, rather than the
adjacent low-mid band. Thus, if a 24 dB/octave filter is used for
LP
1
and HP
1
, then the low-mid band must be in-phase with the
low band. If a 24 dB/octave filter is used for LP
3
and HP
3
, then
the high band must be the in-phase with the mid high band. And
if a 24 dB/octave filter is used for LP
2
and HP
2
, then the mid high
band must be the in-phase with the low band, not the low-mid
band.
Sum-to-Allpass Characteristics of Linkwitz-Riley Crossovers
A characteristic of 2-way Linkwitz-Riley crossovers is that the output
bands sum to an allpass filter—the frequency response of the sum
has a constant magnitude of one and only phase shift occurs. From
Figure 8-4, this means that
LP
x
- HP
x
= θ
x
or
LP
x
+ HP
x
= θ
x
- ISP-100 1
- General Information 3
- CUSTOMER SUPPORT 4
- RETURN SHIPPING INSTRUCTIONS 4
- Table of Contents 10
- INTRODUCTION 13
- About this Manual 14
- Customer Support 14
- SETUP & INSTALLATION 15
- Power Requirements 16
- Operating Environment 16
- Rack Mounting 16
- Card Installation Procedure 17
- Cable Diagrams 18
- Figure 2-8 19
- Figure 2-9 19
- Figure 2-10 20
- Figure 2-11 20
- Figure 2-12 20
- Figure 2-13 21
- Figure 2-14 21
- Figure 2-15 21
- Table 2-1 22
- Figure 2-16 22
- Figure 2-17 23
- Figure 2-18 23
- TROUBLESHOOTING 25
- Diagnostics 26
- Factory Default Mode 26
- Retrieving Version Numbers 27
- Retrieving Serial Numbers 27
- Changing the Fuse 28
- Changing the Battery 28
- WARNING: 28
- Troubleshooting 29
- Technical Support 30
- Procedure for Returns 30
- SPECIFICATIONS 33
- ISP-100 Component Plots 35
- System Measurements 37
- MOM-1 Analog Output Module 39
- Performance 40
- Miscellaneous 41
- Physical 42
- INSTALLING VUE-IT 43
- Figure 5-2 44
- Figure 5-1 44
- Figure 5-3 45
- Figure 5-4 45
- Figure 5-5 45
- Configuring the Software 46
- Figure 5-8 47
- Figure 5-9 47
- GETTING STARTED 49
- Starting a New Project 50
- VUE-IT File System 51
- Using VUE-IT 53
- Edit (see Figure 7-2) 54
- Tools (see Figure 7-3) 54
- Options (see Figure 7-4) 54
- Help (see Figure 7-6) 55
- Preferences (see Figure 7-7) 55
- Window (see Figure 7-5) 55
- Figure 7-8 56
- Project Manager 57
- Figure 7-10 58
- Figure 7-11 59
- Figure 7-12 59
- Figure 7-14 60
- Figure 7-15 61
- QuickSET Manager 62
- Figure 7-18 63
- Figure 7-19 64
- QuickMAP 65
- QuickMAP Component Bypassing 65
- Figure 7-21 66
- Figure 7-22 68
- Device Status Panel 69
- Output Meters 70
- PROCESSING COMPONENTS 71
- Figure 8-1 72
- Compressor 74
- SignalInputofFactorCrest 78
- Crossover 81
- Figure 8-5 83
- Figure 8-6 84
- Figure 8-7 85
- Figure 8-8 87
- Figure 8-9 88
- Figure 8-10 89
- Figure 8-11 94
- Processing Components - Cut 95
- Figure 8-12 96
- Figure 8-13 97
- Figure 8-14 99
- 10 July 1998 100
- Figure 8-15 103
- Figure 8-16 104
- Figure 8-17 109
- 10 June 1998 110
- Processing Components - Gain 111
- Figure 8-18 112
- Processing Components - Gate 113
- Figure 8-19 116
- Figure 8-20 122
- GLOSSARY 123
- Glossary 125
- THIS PAGE LEFT BLANK 126
- INTENTIONALLY 126
- STANDARD QUICKMAPS 127
- MONDOEQ.QMS 128
- 2X6CMBC.QMS 129
- 2X8COMB.QMS 130
- 3X6CMBC.QMS 131
- 2X8THRU.QMS 132
- 4CHAN.QMS 133
- 4X6CMBC.QMS 134
- 4X6THRU.QMS 135
- 3_2W.QMS 136
- 2WAYS.QMS 137
- 2_3WAY.QMS 138
- 2_2W_SUB.QMS 139
- 2_2W_FR.QMS 140
- 2_2W_2ST.QMS 141
- 4_2WAYS.QMS 142
- 4W_2FR.QMS 143
- MONO3W.QMS 145
- 9600 Aldrich Avenue South 146
- Minneapolis, MN 49107 146
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