#
A
B
C
D
E
F
G
H
I
J
K
L
M
N
O
P
Q
R
S
T
U
V
W
X
Y
Z
Accessory (position) - Refers to the position of the key in the ignition switch;
A wire showing 12 Volts (+) when in this position.
Acoustic Absorption - The sound deadening properties of any substance,
measured in sabine units. One sabine is equal to the absorption of 1 square foot of surface
which will absorb all incident energy.
Acoustics
- The study of sound. The science of production, effects, and transmission
of sound waves through various mediums and the effects of absorption, diffraction, interference,
reflection, and refraction.
Aliasing Noise - The result of the sampling frequency not being at least
double the highest analog frequency during the digital encoding of an analog signal.
Alternate-Channel Selectivity - A measurement of a tuner's ability to select one radio
station's signal and reject the signal of another radio station two channels (0.4 Mhz) away.
Measured in decibels, the higher the number the better.
Alternating Current (AC) - An electric current that reverses direction at regular
intervals. Measured in Volts AC at Hertz, example: 110 volts AC 60 Hz.
American Wire Gauge (AWG) - A standard
of the dimensional characteristics of
wire used to conduct electrical current or signals. AWG is identical to the Brown and Sharpe
(B & S) wire gauge.
Ammeter - An instrument that measures the magnitude of an electric current in amperes.
Ampere (amp) - A unit that defines the rate of flow of electricity (current) in a circuit.
Amplification - The increase in signal level, amplitude or magnatude.
Amplifier - 1 A device which increases the level of a signal by increasing the
current or voltage. 2 May also be used to isolate or control a signal and even decrease
the level as in a line output converter.
Amplifier, Power - An amplifier designed for driving loudspeakers and having a higher
power output than a line amplifier or preamplifier.
Amplitude - The maximum value of a periodically varying quantity.
Amplitude Modulation (AM) - The encoding of a carrier wave by variation of it's
amplitude in accordance with an input signal.
AM Stereo
Analog - A way to represent data by means of continuously variable quantities. A
control or circuit which continuously changes the level of a signal in direct relationship to the
control setting. An electrical signal whose frequency and level vary continuously in direct
relationship to the original acoustical sound waves. (something that is analogous)
Analog to Digital Convertor (ADC) - A circuit that converts an analog signal into
a digital signal. With a continuous input signal the ADC will check the signal several time per scecond
(sampling), assign values to the samples and represent it as a binary number (quantization and
encoding).
Analogous - Alike in certain ways. Similiar in function but not in origin or structure.
Antenna - An apparatus used for sending and recieving radio waves, usually constructed
of metal.
Antenna Trimmer - An adjustment found on analog radios used to maximize AM reception.
Turning this trimmer to the point where the sound is the loudest increases the sets signal to noise
ratio optimizing performance.
Attenuator - A device to decrease or increase the strength of a signal.
Auto Eject - Feature of a cassette player that ejects the tape when
it has finished playing one side .
Automatic Gain Control (AGC) - A circuit that continuously adjust the recording
amplifier gain to maintain a relatively constant recording level.
Auto Loud - Automatically provides low frequency boost for listening at low levels.
Auto Replay - Feature of a cassette player that automatically rewinds a tape when
it has reached the end of one side, then begins to replay.
Auto Reverse - Feature of a cassette player that automatically plays the reverse
side of a tape when one side has reached the end.
Auto Stop - Feature of a cassette player that automatically shuts off power when
a tape has reached the end of either side in any mode.
Azimuth - The perpindicular allignment of the tape to the head of a tape player / recorder.
#
A
B
C
D
E
F
G
H
I
J
K
L
M
N
O
P
Q
R
S
T
U
V
W
X
Y
Z
