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Entries found for search: level

50% level : the standard reference level for optical sound recordings that corresponds to the width of the track at 50% modulation, or at 6dB below clipping. In practice, there is about 2dB of headroom available, if all the recording / playback heads are perfectly aligned.

effect send level : The amount of effect to be added, such as reverb, chorusing, or other enhancements, to each channel.

input level : The signal voltage or power present at the input of a device. See headroom headroom.

level : Loosely used when the magnitude of a signal is meant, usually voltage. Strictly speaking, the term should be reserved for the value of a power in dB. The measured level of an audio signal is the amplitude that is caused by the sum of the powers of all of the components of the sound.

level control : An envelope parameter which controls the level of certain synthesizer actions, such as the sustain portion of an ADSR envelope. Compare with rate control.

leveling : The use of a compressor set to high ratios and very slow attack and release times. With a digital recorder, it may be beneficial to have some kind of leveler followed by a processor that does peak-limiting.

level scaling : See keyboard scaling.

level-sensing circuit : An electronic circuit that generates a control voltage in proportion to signal level. This control voltage can then be used to affect the amount or type of signal processing done by a separate device. Also called a detector.

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."

maximum output level (MOL) : For an audio device such as a tape recorder, the MOL is generally taken to mean the output signal level that results in 3% harmonic distortion at low frequencies and usually 3% intermodulation distortion at high frequencies. Any higher signal output than the MOL will result in rapidly increasing distortion, and is a function of both input signal frequency and of the device itself. MOL also applies to a specification for analog magnetic tape. The MOL for a tape is frequency-dependent; all magnetic tape saturates faster at higher frequencies; it is also speed-sensitive: as the recording speed is slowed, the distortion point is lowered. MOL may be referenced to an absolute flux level, or to a test tape. See third harmonic distortion.

mic-level : The nominal output level of a microphone, usually -50dBv to -40dBv, as opposed to line-level. This corresponds to a few millivolts of power.

standard operating level : A reference level by which various pieces of equipment can be adjusted to produce identical output levels or meter readings. In professional recording, standard operating level is defined as 0VU0 VU=+4dBm. In broadcasting, 0VU0 VU=+8dBm. See line-level.

sound pressure level (SPL) : The loudness of an acoustic wave stated in dBindB that is proportional to the logarithm of its acoustic intensity. A sound wave progressing through air causes the instantaneous air pressure at any given point to vary above and below the barometric pressure in accordance with the waveform of the sound. This variation in pressure is used as a quantitative measure of the strength of the sound, and is called sound pressure. This is the quantity which a pressure microphone measures, and if it is expressed on a dBadB scale and referenced to a pressure of 20 µpascals, it is called the sound pressure level. The amplitude dynamic range of human hearing goes from 0dB, or 10 -16 watt/sq.cm., the upper threshold of human hearing to 130dB or 10-4 watt/sq.cm., the threshold of pain, a factor of 1013 in range.

send level : A term used for both hardware audio mixers and software synthesizers, send level is the amount of a sound that is sent to an effects processor via the effects send.

reference level : (1) The reference level on an audio device is a signal level near the maximum possible for the device but low enough to ensure low distortion. (2) The reference level of a power ratio is the unit of power (i.e., watts or volts) being compared. See decibel.

power level : See level.

File Level : The ability to only read and modify an entire file and not the underlying protocols that address the storage device on which the file resides. The term “file level" is often used to differentiate “file-level” NASs from “block-level” SANs.

peak level : See peak.

output level : See nominal level.

operating level : The voltage level defined for any audio system at its nominal, 100% modulation level, not including any headroom. Usually defined as 0dBVU for a steady sine wave.

nominal level : The optimum level at which a signal is processed in a particular piece of audio equipment. For instance, if the unit has a VU meter, this level would be represented by the 0VU "0" mark, past which the meter goes into the red. Normally expressed in dBVindBV for professional recording equipment, the two output levels are commonly called mic-level and line-level. Also called output level.

noise level (1) The noise floor of an electronic device. (2) The steady-state decibel level of ambient noise in an acoustical environment. See NC Curve. (3) The residual noise of a magnetic tape.

zero- level : A level of 0dB(V). All measurements are made relative to this level as it represents (in properly calibrated equipment) the optimal recording or broadcast level. Higher signal levels than this indicate the possibility of overmodulation. Significantly lower levels than this indicate the possibility of undermodulation. See decibel, operating level.



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