MOTU 896 User's Guide Page 115
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- Table of contents
- TROUBLESHOOTING
- BOOKMARKS
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outside the critical frequency range of the
instrument being recorded, you can avoid phase
problems among the mic signals.
Tuning PA systems
The Phase Analysis window can also be used to
troubleshoot and tune PAs and sound
reinforcement systems by placing microphones in
strategic locations, comparing the two signals in
the Phase Analysis grid and looking for phase
issues at various locations.
Summing to mono
The Phase Analysis window is ideal for checking
stereo audio that needs to be summed to mono.
The Phase Analysis lets you see what frequencies
will be canceled out when summed.
In the rectangular view, any lines in the signal that
touch the +1.0 or -1.0 vertical lines in the grid will
be canceled out at the frequency where they touch,
when the signal is summed to mono.
In the polar view, any signal that falls on the
negative y axis (below zero) in polar view will be
canceled out when the signal is summed to mono.
Checking for phase issues in stereo tracks
You can use the Phase Analysis window to check
the overall polarity of a stereo mix. Figure 9-57 is
an example of a full stereo mix that has phase
issues, as indicated by the majority of the signal’s
energy, which is predominantly skewed to the left
side of the rectangular view (left) and spread along
the -y axis in the polar view (right).
Figure 9-57: A stereo mix with phase issues.
Figure 9-56: Two identical audio streams in the Phase Analysis.
Perfectly in phase One-sample delay Twenty-sample delay
Polar view
Rectangular
view
Inverted
896mk3 Hybrid book Page 115 Friday, August 19, 2011 1:44 PM
- MOTU 896mk3 Hybrid 1
- Contents 3
- Getting Started 5
- 8910111213 7
- Quick Reference: 9
- About the 896mk3 Hybrid 11
- THE 896MK3 HYBRID REAR PANEL 12
- ABOUT THE 896MK3 HYBRID 13
- THE 896MK3 HYBRID FRONT PANEL 14
- 16-BIT AND 24-BIT RECORDING 15
- MIXING AND EFFECTS 15
- INCLUDED SOFTWARE 15
- AUDIODESK 16
- DIGITAL PERFORMER 16
- OTHER HOST AUDIO SOFTWARE 16
- Packing List and 17
- System Requirements 17
- OVERVIEW 19
- INSTALLATION 19
- MOTU AUDIO DRIVER 19
- MOTU AUDIO SETUP 20
- CONNECT THE 896MK3 INTERFACE 21
- Input 48V Pad Trim 24
- CONNECT A FOOT SWITCH 25
- A TYPICAL 896MK3 SETUP 26
- MAKING SYNC CONNECTIONS 28
- SYNCING S/PDIF DEVICES 29
- SYNCING OPTICAL DEVICES 30
- SYNCING AES/EBU DEVICES 30
- ■ Clock source 31
- ■ Sample rate conversion 31
- SYNCING WORD CLOCK DEVICES 33
- SYNCING TO SMPTE TIME CODE 34
- INTERFACES 35
- Using the 39
- 896mk3 Hybrid 39
- MOTU Audio Setup 41
- ‘896MK3 HYBRID’ TAB SETTINGS 42
- MOTU AUDIO SETUP 43
- ‘GENERAL’ TAB SETTINGS 47
- Front Panel Operation 49
- COMPRESSOR 50
- PROGRAMMABLE METERS 51
- PUSH-BUTTON ROTARY ENCODERS 51
- MULTI-FUNCTION LCD DISPLAY 51
- 896MK3 SETUP MENU 52
- AUDIO MENU 53
- CUEMIX MENU 53
- FRONT PANEL OPERATION 54
- FRONT PANEL OPERATION 55
- Figure 6-12: The REVERB menu 56
- INPUTS MENU OUTPUTS MENU 57
- MIXES MENU REVERB MENU 58
- STAND-ALONE OPERATION 58
- PREPARATION 59
- RUN MOTU AUDIO SETUP 59
- REDUCING LATENCY 63
- AUDIO INPUT AND OUTPUT NAMES 63
- 24-BIT OPERATION 65
- Reducing Monitoring Latency 67
- MONITORING LIVE INPUT 68
- ■ Patch thru latency 70
- REDUCING MONITORING LATENCY 72
- CueMix FX 73
- AND REVERB 74
- AND PROCESSING 74
- CUEMIX FX INSTALLATION 75
- CUEMIX FX BASIC OPERATION 75
- THE MIXES TAB 77
- THE INPUTS TAB 79
- THE OUTPUTS TAB 81
- Figure 9-6: The Outputs tab 82
- THE CHANNEL SETTINGS SECTION 83
- Figure 9-10: The EQ tab 85
- The name of the 86
- Control unit range 87
- Slope = 6 91
- Slope = 18 91
- Slope = 36 91
- Figure 9-22: The Meters tab 94
- Figure 9-23: The Reverb tab 95
- THE MONITOR GROUP 96
- DSP METER 97
- SOLO LIGHT 97
- TALKBACK AND LISTENBACK 97
- SHORTCUTS 99
- FILE MENU 99
- EDIT MENU 100
- DEVICES MENU 100
- FFT AND SPECTROGRAM DISPLAY 100
- Pause button 102
- Display options 102
- OSCILLOSCOPE 103
- moves the line marking time 104
- moves the line 104
- Trigger indicator 105
- Trigger menu 105
- Criteria check boxes 105
- Trigger modeWhat it does 106
- Color Status 106
- CUEMIX FX 107
- CUEMIX FX 108
- X-Y PLOT 109
- PHASE ANALYSIS 112
- Figure 9-55: Filters 114
- Polar view 115
- Rectangular 115
- Inverted 115
- CONFIGURATIONS MENU 117
- TALKBACK MENU 117
- PHONES MENU 117
- CONTROL SURFACES MENU 118
- MOTU SMPTE Setup 121
- READER SECTION 122
- GENERATOR SECTION 123
- MOTU SMPTE SETUP 124
- Appendices 125
- Audio I/O reference 127
- Troubleshooting 129
- REPLACING DISCS 130
- TECHNICAL SUPPORT 130
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