aestutorial49 diseño de un studio
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Copyright 2005 PMI, Ltd.
An example roomstudio.jory.org
Video Gear Placement
Copyright 2005 PMI, Ltd.
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Video Component Placement
• No direct light onto the screen
Copyright 2005 PMI, Ltd.
Video Component Placement
• If possible provide low level neutrallight behind the screen
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Copyright 2005 PMI, Ltd.
Screen placement guidelines
• Vertical viewing angle to middle of screen <15º
Copyright 2005 PMI, Ltd.
Screen height
Comfort Angle limit:15º
15º
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Screen height - Sight Lines
Clear sight line
15º
Wiring it all up
Copyright 2005 PMI, Ltd.
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Copyright 2005 PMI, Ltd.
Wiring Considerations
• Use decent quality cable• Learn how to solder
• Make up wiring list
• Total up wire length for each type
• Create parts list – Wire – Connectors
• Patch bay layout
Copyright 2005 PMI, Ltd.
Wiring Considerations
• Power distribution
• Don’t run with audio lines
• Grounding
– Go back to same outlet – Star ground
– Measure ground voltage differences
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Copyright 2005 PMI, Ltd.
Wiring – Color coding
• Patch bay coding – Sound Generating devises – Mic preamps – Recording / Playback devices – Encoders – Decoders – Monitors – Tie Lines – Mults – Misc.
Tuning it All
Copyright 2005 PMI, Ltd.
Analysis and equalization
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Copyright 2005 PMI, Ltd.
Electrical Level Calibration
• Digital reference level: -20dBfs• => 20dB Headroom
• Electrical levels: 0 VU = +4dBm = 1.23V
• Verify and adjust levels throughout
• Calibrate the outputs first – 1kHz @ -20dBfs => +4dBm
• Calibrate inputs next
– Take calibrated output and feed to input – Set input gain for –20dBfs at meters
Copyright 2005 PMI, Ltd.
Level Calibration of DAW
• Acoustic: Use midband pink noisesignals at +4dBm output – reference disk or internal test tones – For music, calibrate for 85dB – For film, calibrate surrounds to 82dB
Level
Frequency500Hz 2kHz
Mid-Frequency test noise internalto most good surround processors.The signal is centered in the500Hz to 2kHz region to improvemeasurement accuracy
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Copyright 2005 PMI, Ltd.
Level CalibrationExternal multichannel source
• Electrical: – Use –10/+4dB balanced adapter with gain
controls• Acoustic: Use test DVD with midband
pink noise – Calibrate for 85dB across all channels
Copyright 2005 PMI, Ltd.
Level CalibrationTime synchronization
• Compensate for differences in speaker distance
• Set delays for nearest speakers
• Sound propagates at 1ft/ms
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Copyright 2005 PMI, Ltd.
Analysis – the useful way
Loudspeaker
Microphone 3
Microphone 4
Microphone 2
Microphone 1
1/3 OctaveEqualization
Pink NoiseGenerator
Multiplexer
• Analysisshould bespatially andtemporallyaveraged
• Use GoldLine DSP30Analyzer, or equivalent
Copyright 2005 PMI, Ltd.
Frequency Response CalibrationRoom + Equalizer Phase Response
• 12 dB peakerror at 200 Hz(yellow line)
• Phase error (red line)
• Equal cutintroducesinverse phaseerror
• Amplitude andphase arecorrected!
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Copyright 2005 PMI, Ltd.
Equalization Requirements
• Pink noise source – 20 Hz–20 kHz, switchable to each channel
before the crossover (5.1 Audio Toolkit)
• Real time analyzer – 20 second time averaging
– The ability to average 4 or more readings
from mic multiplexing – 1/12 octave resolution in low frequencies
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Quick Check of OverallFrequency Response
CD
PinkNoise
Compare
Set earphone level to match speaker
CD
Pink
Noise
Using Etymotic ER-4S or ER-6 Earphones
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Tools
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Ulysses Ray Tracing
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SMAART Live
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Gold Line DSP30
• RTA
• 1/3, 1/6, 1/12 th Octave
• Averaging• NC
• RT60
• Integrated solution
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TEF 25
• RTA• TDS
• MLSSA
• Log sweeps
• Phase measurements• Many more
Planning
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Planning is key
• Mission statement• Goals• Macro to Micro• Time schedules• Budgets• Parts lists• Wire lists• Expect it to all cost more than planned
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Good Reading Materials
• Acoustics and Psychoacoustics, Howard, David M., Angus,James, Focal Press, 1996, ISBN 0 240 51482 9
• Audio Engineering Handbook, Benson, K. Blair ed.McGraw-Hill Book Company, 1988
• Building a Recording Studio, Cooper, Jeff, Synergy Group,Inc., Los Angeles. To order call 1-800-468-4322• The Master Handbook of Acoustics, Everest, F. Alton, TAB
Books, Division of McGraw-Hill Inc., Blue Ridge Summit,PA. To order call 1-800-468-4322
• Project Studios, P. Newell, Focal Press, ISBN 0 240 51573 0• Room Acoustics, Kuttruff, Heinrich, Applied Science
Publishers 1973/1991
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Conclusion
• Project studio design is very complex
• Pay attention to all details for a goodsystem
• I hope you enjoyed the presentation
• Thanks,
Anthony Grimani
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