PT101
what does the NYQUIST THEOREM state?
"in order to produce an accurate representation of given frequency of sound, each cycle of the sound's vibration must be sampled a mimimum of two times"
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***CHAPTER 2***
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Pro Tools|HD systems use PCI cards with DSP power (instead of using host computer)
***big advantage*** you are not bogging down the computers energy and limiting the processing power
**S/PDIF has rca jacks aka "coaxial jacks"**
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**an increase of approximately 10 dB is required to produce a percieved doubling of loudness**
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what is the dB range in human hearing?
0dB <----> 120 dB
what does a Pro Tools session contain?
1. Pro Tools Session.ptf (map) 2. Wavecache.wfm (wave pictures) 3. Audio Files (Music) 4. Fade Files (volume fades) 5. Region Groups (regions) 6. Session File Backups (backup) 7. Video Files (video)
what is the range of human hearing?
20 - 20,000 cycles per second
what is the range of human hearing?
20 Hz <---> 20kHz
what is the useful dynamic range of speech and music (generally)?
40 dB <---> 105 dB
Pro Tools supports resolutions up to how many bits?
?
Pro Tools supports up to what sample rate?
?
Pro tools supports up to how many tracks simultaneously?
?
what is Quantization?
?
what does A.A.F. stand for?
Advanced Authoring Format
what does AES/EBU stand for?
Audio Engineering Society/European Broadcast Union (professional format)
what does D.A.W. stand for?
Digital Audio Workstation
what does D.S.P. stand for?
Digital Signal Processing
what does H/W stand for?
HARDWARE
what does I/O stand for?
Input/Output
what are MIDI FILES?
MIDI files exported from Pro Tools are auto-created in the session folder (if you do not export MIDI files it will not be created)
What does M.I.D.I. stand for?
Musicial Instrument Digital Interface
what does O.M.F. stand for?
Open Media Framework
what does PCI stand for?
Peripheral Component Interconnect
**WAVECACHE FILES can be deleted without harming the session or your system
Pro Tools will recalculate the data if you lose the files
what does R.C.A. stand for?
Radio Corporation of America
what does RTAS stand for?
Real-Time Audio Suite (host based)
what does S/PDIF stand for?
Sony Phillips Digital Interface Format (consumer format)
what is PRO TOOLS?
a multi-track software-based digital recording and editing system
what is a ILOK KEY?
a usb flash drive that stores all your plug-ins and software licenses (stuff you bought)
what is a SESSION FOLDER?
all of the files used in a project
what does raising the H/W BUFFER SIZE do?
allows for more audio processing and effects (more RTAS plug-ins)
what does A/D CONVERSION stand for?
analog-to-digital conversion
what are AUDIO FILES?
audio that you record in a Pro Tools session
What does MIDI do?
capture performance event data rather than sound samples (resolution-independent)
what is ELASTIC AUDIO?
change the speed of (audio clips) in real time
**Composite cable is worse than Component cable**
composite supports 480i (interlaced) NTSC component supports 1080p (progressive scan)
**the binary word length is also referred to as BIT DEPTH**
computers use binary digits called BITS (0s or 1s)
what is a SESSION.PTF?
contains a map of all the audio tracks, audio and video files, settings and edits associated with your project
what are FADE FILES?
contains separate fade file documents: volume fade-ins, fade-outs, crossfades
what is the CPU USAGE LIMIT?
controls the percentage of the computer's processing power given to a Pro Tools session
what is the H/W BUFFER SIZE?
controls the size of hardware cache used to handle host-based tasks, such as RTAS plug-in processing
what are VIDEO FILES?
created only when you digitzed a movie into Pro Tools (when you have video files)
what are REGION GROUPS?
default directory that Pro Tools uses for any region groups you export from your Pro tools session
what does raising the CPU USAGE do?
gives more processing power to Pro Tools (for playing back large sessions or using RTAS plug-ins)
what are SESSION FILE BACKUPS?
if you enable the AUTOSAVE function in Pro Tools, the session file "backups folder" will appear and save data periodically
what are RENDERED FILES?
if you make a (rendered elastic audio processing) to a track, a auto created file is placed in the session folder
**an A/D converter must be able to accurately repreesnt differences in amplitude of at least 65 dB**
it must have a mimimum range of (65 dB) quality A/D CONVERTERS are important
what does lowering the CPU USAGE do?
limit the effect of Pro Tools processing on other processing-intensive tasks (useful when experiencing slow system response) or (you are running other applications at the same as Pro Tools)
what is AMPLITUDE?
loudness (measured in decibels "dB")
what is FREQUENCY?
pitch (low pitch "slow" <---> high "fast")
what does lowering the H/W BUFFER SIZE do?
reduces monitor latency and useful when you are recording live input
what are WAVECACHE FILES?
stores all of the waveform display data fro the session and enables it to open more quickly
**Composite has 1 rca cable and Component has 3 rca cables (red,yellow,white)**
the (red,blue,green) rca cable is a split version of a Composite (yellow) cable
what is SAMPLING?
the process of taking discrete readings of a signal at various moments in time (digital snapshots: higher amount is best)
what is a WAVEFORM?
the shape (character) of the sound
what is a system that is HOST-BASED?
they use the processing power of the host computer
**the process of converting from digital to analag and back to digital can introduce distartion and degrade the original signal**
unnecessary conversions should be avoided
**professionals sample at least 44.1 kHz **
why? because 20kHz is the highest range of human hearing and now let's add the Nyquist theorem and double it "40kHz"
**the Mix knob on the Mbox 2 and Mbox 2 mini enables what?
you can monitor analog input signals while recording with zero latency