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Entries found for search: line

airline version : A remixed and possibly re-edited version of a film that has any objectionable material removed. The airline film standard is more stringent even than those of the broadcast networks, and is often used as a benchmark for TV viewing.

Academy centerline : See optical track.

backline : On-stage instrument amplification.

balanced line : Audio lines in which the signal current is not carried by the cable shield of a shielded cable. This requires two conductors for the signal, enclosed in a shield, with neither conductor connected to the shield. The circuit utilizes two identical conductors operated so that the voltages on each of them are equal in magnitude, but opposite in polarity with respect to ground. Compare with unbalanced line. See common-mode..

cue line : A line drawn on the workprint, meant to be seen during projection in post-dubbing or scoring, which gives the actor or conductor a visual cue to begin.

in-line : A configuration for input channels on a mixing desk, where the tape returns are connected via a parallel and additional line input to the channel. This obviates the need for a separate tape monitoring section on the desk, hence the tape returns are said to be in- line. The advantage is that, during remix, the input channels are all available as inputs, allowing all available tape tracks to be mixed from all available tracks of audio from synthesizers. Thus, in- line operation effectively doubles the number of inputs on a mixer. The opposite of a split console-type mixer.

leger line : See stave.

line : (1) A signal path or actual cable through which a signal passes. (2) One horizontal scan of the raster in NTSC, PAL, or SECAM video signals. See field(4).

line amplifier : Any amplifier with a line-level output and an output impedance of approximately 600 ohms.

linear : (1) A system is said to be linear if it meets the conditions of proportionality and additivity: if its output level changes smoothly in proportion to input level changes, and if input x causes output X and input y causes output Y, then x + y at the input must cause X + Y at the output. Most tests in audio including frequency response, gain, phase, impulse response, etc. assume linearity. (2) Uncompressed, i.e., an audio file that has not been processed by some kind of compression algorithm, such as ADPCM. (3) A process which works in a sequential fashion, such as magnetic tape recording, playback the or editing tape media, etc., as opposed to a sequence of steps which can be taken in any order and/or in any location, such as the random-access editing and playback processes which are made possible by digital storage technology.

linear distortion : Any type of distortion that a linear system is capable of producing, as opposed to nonlinear distortion. Some types of linear distortion are frequency response errors and time-delay errors such as phase-shift.

line-level : The average audio voltage level of a signal at a particular point in an audio system above 25mV RMS. The output level of a preamplifier is typically line-level, and the input level of a power amplifier is line-level. In home or semi-pro equipment, the input or output operating level is usually -10dBV. In commercial audio systems, line-level is metered with a VU meter, where 0VU corresponds to 0.775V RMS of a signal. The line-level in professional audio systems may be +4dBm (1.23V RMS) or (archaic) +8dBm (1.95V RMS) or even +20dBm (~9V). Typical line-level audio signals include synthesizer outputs, mixer outputs, and effects outputs. As opposed to mic-level."

line-matching transformer : An electronic component that matches the output impedance of one device with the input impedance of the next device in a signal path.

line pad : A passive attenuation network that can be inserted in a line.

line-up : The procedure carried out to ensure that recording, editing, playback, amplification, etc. equipment works to the highest possible standard. It consists of systematic adjustment of the equipment according to a schedule and may involve specialized calibration and test apparatus such as a multimeter, tone generator, oscilloscope, etc.

line-up tone : (1) Also called a reference tone or reference frequency. A sine wave used for servo control, such as on a sync tone. See vari-speed. (2) A sine wave tone at one of a range of standard frequencies (usually 100, 1,000 and 10,000 Hz). It is set to zero-level and is intended to be used for calibration, such as during a line-up procedure. The APRS-specified line-up tones for magnetic tape recording are:

mic/line switch : On a recording console, the two-position switch that allows the engineer to select whether each module will control the mic-level signal from a microphone in the studio, or the previously recorded track of a tape or other signal coming into the console at line-level.

phon lines : See equal loudness curves.

phase linear : The ability of an audio device to pass a signal without causing phase-shift.

Phase-Alternating Line : See PAL.

on-line/off-line : (1) The opposite of real-time, i.e., processing to an audio or other file which is not done at the same time as the human actions which initiate the processing. (2) In the videotape editing process, off-line is when the final edit list is compiled (on a less expensive machine), i.e., where only the EDL is created, but not conformed, in preparation for the final edit. On-line is where the video tape master is created from the EDL, including all effects using high-quality equipment, usually a 1" video deck. (3) In a network, any device which is able/unable to receive or transmit a signal. (4) In a system of synchronized devices, a slave device which is waiting for a particular time code value to be reached before it will play or record, etc., is said to be on-line.

off-line : See on-line.

nonlinear distortion Linearity would predict an invariant ratio of gain to input voltage in an audio device such as an amplifier. Manifested as harmonic distortion and intermodulation distortion, there is a point at which the amplifier gain is reduced as the input gain is increased. This is the nonlinear region of the amplifier. All audio devices have local peculiarities or deviations from linearity at specific signal levels. See also distortion, linear distortion.

nonlinear recording Use of a recording medium which is random access, i.e., not recorded to conventional tape. Digital recording systems allow for playback in any order, while linear systems require that playback occur in the order in which the material was recorded.

tie line : A permanent, but undedicated, connection between two points some distance apart, e.g., between a terminal box in the studio and the patchbay in the control room.

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