REC 125 FINAL
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. What would you like to do?
What does the Yamaha DX7 have with MIDI?
It was the first synth to be able to use MIDI
What is MIDI?
language for electronic instructions to make something happen (based on bytes); can be music, lights, pyrotechnics, or water jets
When was MIDI introduced?
1981 at AES convention, 1983 at the NAMM Show
What was MIDI originally intended for?
to connect 2 different keyboards to control one another
What disadvantages did analog synths have to digital synths?
- depend on voltage and could go out of tune if there isn't enough voltage
- heat would mess with the tuning of oscillators
- didn't have as good of an attack as digital synths
What two numbers could a bit be?
0 or 1
How many values does 2 bits have?
What is the first bit called in an 8-bit word?
What is MIDI's value range?
0-127 (128 total values)
How many bits are in a byte?
What parameter in MIDI isn't controlled on the same scale as everything else?
Pitch bend isn't on the 0-127 scale
How many keys are on a keyboard?
What key number is middle C on a keyboard?
What is automation?
changes in mix that are synced to the timeline of the music
how fast a key is pressed down (translates to volume to us)
What kind of transmission is MIDI?
How many bits/sec. does MIDI do?
How many bits make one nibble?
How many channels per port can MIDI do?
16 channels per port
What is channel 10 reserved for in MIDI?
What does it mean when people say "digital"?
information is represented as 0's and 1's (binary code)
What are the two types of bytes? What does each tell us?
- Status Byte: if the note is pressed or released
- Data Byte: which note is pressed
What does a panic button do? Why use it?
It turns off all MIDI notes because sometimes a note will get stuck on
What is the default velocity for MIDI?
What is included in a note-on message?
- note on status
- MIDI pitch #/note #
- attack velocity value
What is included in a note-off message?
- note-off status
- MIDI pitch #/note #
- release velocity
- you can press down on the key and then add more pressure to make something else happen to the note (like some sort of effect)
- AKA "aftertouch"
Channel Pressure messages:
play a chord and do aftertouch to ONE key to make a thing happen to that key
Polyphonic key pressure:
aftertouch applied to each note of the chord
Pitch Bend message:
2 data bytes to 1 status byte
One note at a time
more than one note at one time
More than one sound at a time
What number range is the MIDI note messages in?
21-108 (88 keys of MIDI controller)
breaking the internal connection between the keyboard and tone generator; signal goes to MIDI OUT port
What is sampling?
taking a snapshot of a waveform
What is quantization?
assigning values to samples that are taken
Zero Crossing also called:
4 advantages of hard disk recorders:
- larger sound files
- random access editing
- nondestructive edits
- digital signal processing
5 characteristics of DAWs
- Integration: allows everything to talk to each other
- Communication: DAW should be able to distribute info
- Speed/flexibility: quicker to edit and process
- Automation: can recall session and undo easily
- Expandibility: can add new stuff
- User Friendly: can communicate with user
- These are all display types
- LCD: liquid crystal display
- CRT: cathode ray tube
- LED: light emitting diode
hardware that allows you to connect instruments and mics to your computer, converts audio from analog to digital
What is "nondestructive" editing?
nothing is actually deleted, you can always get it back easily
What does the Red Book tell us?
What is the CD quality spec?
- 44.1kHz sample rate
- 16 bit depth
- IN: receive message from external source
- OUT: transmits MIDI performance and control messages to another device
- THRU: transmit copy of IN messages
What does a longer word length give you?
more detail and quality in recording
how many times audio is sampled per second; tells us frequency range
sample rate must be double that of the highest frequency
Audio Driver protocols:
- WDM: Windows Driver Model (AVOID LIKE THE PLAGUE)
- AISO: Audio Stream I/O (backbone of VST, low latency)
- MAS: MOTU Audio System (for mac)
- Core Audio: made by Mac
How many ticks (Pulses per Quarter note AKA PPQ) are there in a beat?
System Exclusive message:
bulk transmission and reception of many things...
What does each pin do on a MIDI cable?
- 1: nothing
- 2: Ground (earth to ground)
- 3: nothing
- 4: MIDI signal
- 5: MIDI signal
What is at the core of an electronic instrument?
EQ out overtones you don't want
add oscillators/operators for sounds
What is wavetable synthesis and who developed it?
Roland; take a sample of the initial sound of a real instrument ("chiff") and then the rest of the note is synthesized
What are operators?
signal generators for frequency modulation synthesis
Frequency modulation synthesis:
digital sounds (pioneered by Yamaha DX-7), had a minimum of 2 operators; could get harder attack than analog
general MIDI on the motherboard
What did samplers allow people to do?
load a WAV file to a key or button
a key will change something at a certain key #
Modular software synths:
hold multiple synths inside them
split keyboard into zones
- AU (Audio Unit)
- VST (Virtual Sound Technology)
- MAS (MOTU Audio System)
- RTAS (Real Time Audio Suite)
- TDM (Time Domain Multiplex)
- Made in mid '90's by Intel for Apple
- can handle 63 devices
- FireWire 400: 400 Mbits/sec
- FireWire 800: 800 Mbits/sec
- FireWire 400 and 800 are different plugs
- Universal Serial Bus
- 1.0: 1.5 Mbits/sec (first generation); low bandwidth peripherals
- 1.0: 12 Mbits/sec (second gen); for devices needing higher throughput
- 2.0: 480 Mbits/sec; hi-throughput and fast transfer
- 3.1: 10G Gbits/sec
- 3 years old now
- 10 Gbits/sec per channel (two channels)
- can handle 127 external devices
- devices can be plugged and unplugged when computer is on (except flash drives)
- data flows both ways
- provides data signal and DC power
- can daisy chain in USB hub (but it looks for things in order)
How long can these cable types be?
FireWire 400 and 800
Wireless MIDI (not a cable, I know)
- USB: 5m for hi-speed, 3m for low-speed
- FireWire 400: 4.5m
- FireWire 800: 100m
- MIDI: 50ft.
- Wireless MIDI: 500ft
looks at highest peaks and the distance from peak to the highest one, turns up that peak the amount of distance
MIDI time code; quarter frame messages that MIDI syncs to
Society of Motion Picture and Television Engineers; identifies an exact position on a tape or media form by assigning digital address' over the course of a program's duration; standard method to interlock audio, video, and film transports
How many values are in:
How many bits are in 1dB?
How many channel voice messages are there?
- note on, note off, polyphonic key pressure, channel pressure, program change, pitch bend change, control changeq
29.97 fps drop-frame:
designed so color TV's could still read a monochrome signal; 2 frames are dropped every minute except for multiples of 10 (00, 10, 20, etc.)
29.97 fps non-drop
color standard; frame count will always increase one count per frame
submix of instruments, intended to be used to master a song
What would you like to do?
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