Yamaha D24 Owner's Manual - Page 201

mini YGDAI Yamaha General Digital Audio Interface, MIDI Musical Instrument Digital Interface

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202 Glossary Initial settings-The settings used when a device is first turned on after leaving the factory. Also known as the default, or factory settings. Line-Level Signal-A high-level signal in the range from -20 dB to +20 dB. Most audio equipment outputs signals at line level. Contrast with Low-Level Signal. Logical formatting-Also known as "high-level formatting," disk formatting that simply initializes a disk's filing system. Contrast with physical formatting. Low-Level Signal-A signal in the range from -100 dB to -20 dB. Microphone and electric guitar signals are in this range. Contrast with Line-Level Signal. LSB (Least Significant Bit)-The least significant bit of a binary number. Contrast with MSB. LTC (Longitudinal Timecode)-Timecode, commonly used in audio applications, that is recorded throughout the length of the program material, with each 80-bit timecode word or frame contains sync and time information. MDM-Abbreviation for modular digital multitrack. MIDI (Musical Instrument Digital Interface)-The standard digital interface for remotely controlling electronic musical systems and audio equipment. MIDI timecode-See MTC. mini YGDAI (Yamaha General Digital Audio Interface)-The second-generation YGDAI interface system used on the 01V Digital Mixing Console and D24. MMC (MIDI Machine Control)- The set of MIDI commands for controlling tape recorders, video machines, and other studio equipment. Typical MMC commands include Stop, Play, Rewind, and Pause. MO (Magneto Optical)-To store data, MO disk technology uses a laser to heat the storage media to the Curie point, at which the magnetic polarity can be changed by applying a magnetic field. Reading is performed optically, with reflection variations due to magnetic polarization being converted into electrical signals. MSB (Most Significant Bit)-Thinnest significant bit of a binary number. Contrast with LSB. MTC (MIDI Timecode)-An addition to the MIDI Standard that allows the transmission of timing information over MIDI. MTC contains clock and position information. Nominal level-See Operating Level. Nyquist theorem-The Nyquist theorem states that the sampling rate of a digital audio system must be at least twice that of the highest audio frequency, otherwise waveform distortion know as aliasing will occur. See also Aliasing. Operating level-This is the signal level at which a piece of audio equipment is designed to operate. The two most common operating levels are -10 dBV (316 mV), which is used by semiprofessional equipment, and +4 dBu (1.23 V), which is used by professional equipment. Oversampling-A technique used to reduce noise due to quantization errors in which audio is sampled at a rate much higher than the nominal sampling rate. Overwrite-type MO disks-MO disks come in two flavors: Normal and Overwrite. With normal disks, writing is a two-step process requiring two disk revolutions: one to erase and one to write. With Overwrite-type disks, the erase step is not necessary, so data can be written in a single revolution, offering write speeds 1.5-times faster than those of normal disks. PCM (Pulse Code Modulation)-In the second stage of A/D conversion, the pulses derived using PAM are converted into binary numbers. D24-Owner's Manual

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202
Glossary
D24—Owner’s Manual
Initial settings
—The settings used when a device is first turned on after leaving the
factory. Also known as the default, or factory settings.
Line-Level Signal
—A high-level signal in the range from –20 dB to +20 dB. Most
audio equipment outputs signals at line level.
Contrast with
Low-Level Signal.
Logical formatting
—Also known as “high-level formatting,” disk formatting that
simply initializes a disk’s filing system.
Contrast with
physical formatting.
Low-Level Signal
—A signal in the range from –100 dB to –20 dB. Microphone and
electric guitar signals are in this range.
Contrast with
Line-Level Signal.
LSB (Least Signi
fi
cant Bit)
—
The least significant bit of a binary number.
Contrast
with
MSB.
LTC (Longitudinal Timecode)
—Timecode, commonly used in audio applica-
tions, that is recorded throughout the length of the program material, with each 80-bit
timecode word or frame contains sync and time information.
MDM
—Abbreviation for modular digital multitrack.
MIDI (Musical Instrument Digital Interface)
—The standard digital interface
for remotely controlling electronic musical systems and audio equipment.
MIDI timecode
—
See
MTC.
mini YGDAI (Yamaha General Digital Audio Interface)
—The second-gener-
ation YGDAI interface system used on the 01V Digital Mixing Console and D24.
MMC (MIDI Machine Control)
— The set of MIDI commands for controlling tape
recorders, video machines, and other studio equipment. Typical MMC commands
include Stop, Play, Rewind, and Pause.
MO (Magneto Optical)
—To store data, MO disk technology uses a laser to heat the
storage media to the Curie point, at which the magnetic polarity can be changed by
applying a magnetic field. Reading is performed optically, with reflection variations due
to magnetic polarization being converted into electrical signals.
MSB (Most Signi
fi
cant Bit)
—
Thinnest significant bit of a binary number.
Contrast
with
LSB.
MTC (MIDI Timecode)
—An addition to the MIDI Standard that allows the trans-
mission of timing information over MIDI. MTC contains clock and position informa-
tion.
Nominal level
—
See
Operating Level.
Nyquist theorem
—The Nyquist theorem states that the sampling rate of a digital
audio system must be at least twice that of the highest audio frequency, otherwise wave-
form distortion know as aliasing will occur.
See also
Aliasing.
Operating level
—This is the signal level at which a piece of audio equipment is
designed to operate. The two most common operating levels are –10 dBV (316 mV),
which is used by semiprofessional equipment, and +4 dBu (1.23 V), which is used by
professional equipment.
Oversampling
—A technique used to reduce noise due to quantization errors in
which audio is sampled at a rate much higher than the nominal sampling rate.
Overwrite-type MO disks
—MO disks come in two flavors: Normal and Overwrite.
With normal disks, writing is a two-step process requiring two disk revolutions: one to
erase and one to write. With Overwrite-type disks, the erase step is not necessary, so
data can be written in a single revolution, offering write speeds 1.5-times faster than
those of normal disks.
PCM (Pulse Code Modulation)
—In the second stage of A/D conversion, the
pulses derived using PAM are converted into binary numbers.