18WuD2x

464 Musical Instrument Digital Interface • Mylar
quarter-note lasts. It controls the operation of a
music synthesizer, and allows two or more synthesizers
to communicate.
musical quality See TIMBRE.
musical scale A series of tones between a given
tone and its second harmonic, scaled in intervals
of 1 ⁄8 octave. The most common example can be
found on a piano. Variations exist (e.g., 13-note
scale, six-note scale, and five-note scale).
music chip An integrated circuit for producing
various musical effects (such as tones, percussion,
etc.).
music power For a power amplifier, the short-term
output power obtained in the reproduction of music
waveforms, in contrast to root-mean-square
(rms) or effective power output.
music synthesizer A set of oscillators, usually operated
with a computer, used to create or playing
electronic music. Also see MOOG SYNTHESIZER
and MUSIC INSTRUMENT DIGITAL INTERFACE.
music under Pertaining to low-volume, continuous,
background music, often added to presentations,
radio and television advertisements,
educational programs, etc.
muting
1. Disabling a receiver or amplifier under
no-signal or weak-signal conditions. 2. Softening
or muffling a sound.
+
Amplifier
stage
Muting
transistor
muting
muting circuit 1. An interference-preventing device
that automatically shuts off a radio receiver
during the operation of a transmitter, and vice
versa. 2. A squelch circuit. 3. In a stereo receiver,
an electronic element that cuts off all audio when
no signal is present or when the receiver is being
tuned between carriers.
muting switch A switch or relay that cuts off a receiver
during periods of transmission, or when reception
is not desired. Generally, a cutoff voltage
is applied to one of the intermediate-frequency
+
stages to accomplish muting. In some cases, the
audio-frequency circuit is disabled.
mutual antenna coupling Electromagnetic coupling
between or among antennas when they are
placed too close together. Usually, it is an undesirable
phenomenon.
mutual capacitance Inherent capacitance between
two conductors.
mutual-capacitance attenuator An attenuator
that, in its simplest form, is essentially a
shielded, two-plate variable capacitor.
mutual conductance See TRANSCONDUCTANCE.
mutual impedance An impedance shared by two
or more branches of a circuit.
mutual inductance Symbol, M. Unit, henry. The
property shared by neighboring inductors or inductive
devices that enables induction to occur. A
mutual inductance of 1 henry is present when a
current change of 1 ampere per second in one inductor
induces 1 volt across another inductor.
Also see INDUCTANCE.
mutual-inductance attenuator An attenuator
consisting essentially of two coupled coils (input
and output), whose spacing can be gradually
changed.
mutual-inductance bridge See CAREY-FOSTER
MUTUAL-INDUCTANCE BRIDGE.
mutual induction The action whereby the magnetic
field produced by alternating current in one
conductor produces a voltage in another isolated
conductor.
mutual interference 1. See ADJACENT-
CHANNEL INTERFERENCE. 2. Any kind of
interference between or among radio-frequency
communications circuits.
mutually exclusive events Two or more events (or
data points) so that the occurrence of one prevents
the occurrence of the other(s). That is, two
events cannot take place simultaneously.
MV 1. Abbreviation of MEGAVOLT. 2. Abbreviation
of MULTIVIBRATOR.
mV Abbreviation of MILLIVOLT.
MV Abbreviation of MEDIUM VOLTAGE.
MVA Abbreviation of MEGAVOLT-AMPERE.
mV/m Abbreviation of millivolts per meter.
mVP Abbreviation of MILLIVOLT POTENTIOME-
TER.
MW Symbol for MEGAWATT.
mW Symbol for MILLIWATT.
mw Abbreviation of MEDIUM WAVE.
MWH Abbreviation of MEGAWATT-HOUR.
mW RTL Abbreviation of milliwatt resistor-transistor
logic or low-power resistor-transistor logic.
Mx Abbreviation of MAXWELL.
Mycalex Trade name for an insulating material
consisting of mica bonded with glass. Dielectric
constant, 6 to 8. Resistivity, 10 13 ohm-cm.
Mylar A DuPont registered trademark. A tough,
plastic insulating material commonly used as a
magnetic tape base. Dielectric constant, 2.8 to
3.7. Dielectric strength, 7000 V/mil.