Glossary - Alesis AI-2 Reference Manual

8.4 GLOSSARY

24. '24' refers to both the film-standard speed and code type.
25. '25' refers to both the EBU/PAL speed and code type.
29.97. '29.97' refers to a SMPTE frame rate only, in frames-per-
second. (See Drop Frame)
30. '30' refers to SMPTE frame rate, in frames-per-second.
(See Drop Frame and Non drop Frame
Address. SMPTE/EBU time code address. Also referred to as
time code value. A specific and unique address in the time code
data stream. A set of SMPTE or EBU time code numbers indicating
a specific position on tape. A complete SMPTE address includes
hours, minutes, seconds, and frames.
Analog Audio. The "traditional" means of recording and reproduc-
ing sound, using fluctuating electronic voltages to replicate audio
waveforms.
Autolocator. A device that can hold multiple tape locations in
memory and chase to those locations on command, using SMPTE
addresses, tach pulses, or control track pulses to find a desired
point on tape.
Biphase Encoding. The way in which SMPTE time code gets
encoded onto analog tape. It expresses binary '1' and binary '0'.
Biphase encoding reverses the signal polarity halfway through a bit
to represent a '1' and leaves the bit polarity unchanged to represent
a '0'.
Blanking Interval. The blanking interval occurs at the end of a
frame. Video information is absent during the blanking interval.
The interval occurs when the CRT electron gun scanner goes from
the bottom right corner of the screen to the beginning of the next
field in the top left corner.
Byte. A byte is made up of two or more bits, which can be either a
0 or 1. A group of related binary data or a word that can be read,
interpreted, and acted on by a microprocessor.
Cent. A unit or measurement of musical pitch that is 1/100 of a
semitone. There are twelve semitones to an octave.
Code Type. See Time Code Type.
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