BSS Audio DPR-901ii, Руководство пользователя и инструкция по эксплуатации

Страница: 27 / 30

27
LIMIT Limiting occurs when a compressor having a high ratio, generally 6:1 or
more passes a signal that exceeds the equipment’s threshold setting.
Large variations in peak signal level are ‘squashed’, typically fluctuating
less than 3dB for a 20 to 30dB increase. See EXPAND’ (above)for an
explanation of compression and thresholds.
LINE LEVEL Generally indicates signals between -10 and +10dBu, or -12 to +8dBV.
Mic level refers to levels around -40dBu. Speaker levels are typ10
to +40dBu.
LF Low frequencies, or Bass, generally between 10Hz and 200 to 800Hz.
OCTAVE
A logarithmic unit for expressing frequency ratios. Positive values indi-
cate an increase in frequency, and negative ones a decrease. One octave
‘up’ the scale is a doubling in frequency. One octave ‘down’ is half the
frequency.
PHASE CHANGE or INVERT See Polarity Reversal
PHASINESS An expression for unpleasant variations in tonal colouration when two or
more sound sources are mutually counteracting.
POLARITY REVERSAL A reversal of instantaneous signal polarity, equivalent to a phase shift of
180
°
. Same as polarity inversion.
STATE VARIABLE A classic but sophisticated circuit network used for equalisation. It uses
more components than budget equaliser circuits, but when applied
correctly, it has a smoother phase response, and greater accuracy in the
time domain. Moreover, the EQ’s operating state (defined by centre
frequency, width and gain) is easily swept - as the name ‘state variable’
implies.
TRANSIENT A sudden burst of energy in an audio signal, which only lasts for a small
period of time, relative to the rest of the signal. The level of these tran-
sients can often reach 10 times (+20dB) or so above the normal operat-
ing level of the equipment, and may cause distortion if the headroom is
inadequate.
UNITY GAIN When the output signal level is equal to the input signal level, ie. no
amplification or attenuation.