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Accessory (position) - Refers to the position of
the key in the ignition switch; A wire showing 12 Volts (+)
when in this position. |
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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. |
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Acoustic Feedback - A squealing sound when the output
of an audio circuit is fed back in phase into the circuit's
input. |
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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. |
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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. |
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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. |
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Alternating Current (AC) - An electric current that
reverses direction at regular intervals. Measured in Volts
AC at Hertz, example: 110 volts AC 60 Hz. |
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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. |
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Ammeter - An instrument that measures the magnitude
of an electric current in amperes. |
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Ampere (amp) - A unit that defines the rate of flow
of electricity (current) in a circuit. |
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Amplification - The increase in signal level, amplitude
or magnitude. |
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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. |
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Amplifier, Power - An amplifier designed for driving
loudspeakers and having a higher power output than a line amplifier
or preamplifier. |
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Amplitude - The maximum value of a periodically varying
quantity. |
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Amplitude Modulation (AM) - The encoding of a carrier
wave by variation of it's amplitude in accordance with an input
signal. AM Stereo |
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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) |
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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
second (sampling), assign values to the samples and represent
it as a binary number (quantization and encoding). |
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Analogous - Alike in certain ways. Similar in function
but not in origin or structure. |
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Antenna - An apparatus used for sending and receiving
radio waves, usually constructed of metal. |
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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. |
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Attenuator - A device to decrease or increase the
strength of a signal. |
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Auto Eject - Feature of a cassette player that ejects
the tape when it has finished playing one side. |
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Auto Loud - Automatically provides low frequency
boost for listening at low levels. |
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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. |
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Auto Reverse - Feature of a cassette player that
automatically plays the reverse side of a tape when one side
has reached the end. |
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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. |
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Automatic Gain Control (AGC) - A circuit that continuously
adjust the recording amplifier gain to maintain a relatively
constant recording level. |
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Azimuth - The perpendicular alignment of the tape
to the head of a tape player / recorder. |
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