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Mobile Electronics Glossary of Terms and Definitions - S

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
Mobile Electronics Glossary - S
  Sabine - Unit of measurement for absorption. One sabine is equal to the absorption of 1 square foot of surface which will absorb all incident energy.
  Sampling - Measuring the analog signal at a fixed rate of speed (sampling frequency).
  Sd - Effective piston radiating area of driver, in square centimeters. "This is the actual surface area of the cone, normally given in square cm."
  Sealed Enclosure - A type of speaker enclosure that does not allow the pressure generated by the back wave of the speaker to leave the enclosure.
  Selectivity (alternate channel) - Similar to capture ratio, but deals with signals which are broadcast on frequencies very close to the one selected.
  Sensitivity (loudspeaker sensitivity) - The sound pressure level a speaker produces when fed by a given input power, measured at a specific distance on axis directly in front of the speaker. Typically specified in dB SPL at 1 meter with 1 watt of input signal.
  Separates - A speaker system with more than one type of driver. The most common type of separates system is a set containing two high frequency drivers (tweeters), two lower frequency drivers (mids or woofers), and two crossover networks (filters).
  Separation - The degree to which left and right channels in a stereo signal can be kept apart.
  Series Circuit - A circuit configuration in which a single current path is arranged among all components. Connecting the positive speaker output of an amplifier channel to the positive terminal of speaker # 1 , connecting the negative terminal of # 1 to the positive terminal of speaker # 2, and the negative terminal of # 2 to the negative output of the same amplifier channel is a series connection.
  Shield - A metallic foil or braided wire layer surrounding conductors which is designed to prevent electrostatic or electromagnetic interference from external sources.
  Signal - Any electrical transmittance that conveys data.
  Signal-to-Noise Ratio (S/N) - The ratio of the desired signal level to the level of unwanted noise. Measured in decibels.
Signal-to-Noise Ratio
10.0 dB
20.0 dB
30.0 dB
40.0 dB
50.0 dB
60.0 dB
70.0 dB
80.0 dB
Times Signal is Greater than Noise
3.16
10.00
31.62
100.00
316.20
1,000.00
3,162.00
10,000.00
  Slope - The rate of boost or attenuation expressed in decibels of change per octave.
  Sound - A wave propagated in air producing an auditory sensation in the ear by the change of pressure at the ear.
  Sound Field - The total acoustical characteristics of a space, such as ambience [number, timing, and relative level of reflections (ratio of direct to reflected sound)].
  Sound Pressure Level (SPL) - An acoustic measurement of sound energy, typically expressed in dB SPL.
  Sound Stage - The area that appears to be occupied by sonic images. as with a real stage, a sound stage should have depth, height, and width.
  SPDT - Single Pole Double Throw. A relay that has only one pole or contact but whose contact can throw or make electrical contact with two separate stationary contacts.
  Speaker - A transducer which converts electrical energy into acoustical energy (sound).
  Spectrum Analyzer - A device that displays a frequency response curve, in real time, as the curve, changes.
  SPST - Single Pole Single Throw. A relay that has only one pole or contact and can only throw or make electrical contact with one stationary contact.
  Standing Waves - Created when two waves in opposite directions interfere. When a reflected wave reinforces a reflection of the original waveform, the sound waves reinforce themselves, increasing in altitude.
  Stereophonic (stereo) - Consisting of two or more audio channels in an audio system during recording and playback to give a more natural distribution of sound.
  Sub Harmonic - The result of the division of the fundamental frequency by the desired number harmonic. The sub harmonic of 1000 Hz is 500 Hz.
  Subcode - Data, other than music, which is stored on a CD, MD, or other digital format. Used to indicate track number, index number, use of emphasis, and other information.
  Sub-woofer - A loudspeaker made to reproduce the lowest of audio frequencies, approx. 25 Hz to 125 Hz.
  Supertweeter - A high frequency driver designed to reproduce very high frequencies, typically over 10 kHz.
  Switch - A switch is any form of mechanical, electronic, electromechanical, magnetic, or mercury device that either opens or closes a circuit
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
Mobile Electronics Basics:
Diodes
Glossary of Terms and Definitions
Ohm's Law
Recommended Books & DVD's
Recommended Wire Sizes
Relays
Resistors
Tools and Equipment


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