Filter
Top Products
A-2
10 July 1998
Cut To reduce a signal’s overall amplitude.
D to A Digital to Analog. Conversion of a digital representation to an analog
equivalent signal.
dBFS Decibels with respect to digital full scale. The full scale amplitude (zero dBFS
value) is the peak value of a sinewave whose positive or negative peak just
reaches full scale.
dBm dB relative to a reference value of 1 milliwatt. dBm is thus a power unit and
requires knowledge of power levels (voltage and current, voltage and
impedance, or current and impedance) rather than just voltage.
dBr Relative dB; dB relative to an arbitrary reference value. The reference value
must be stated for this to be a meaningful unit.
dBu dB relative to a reference of 0.7746 Volts. Since 0.7746 Volts is the voltage
across a 600 Ohm resistor when one milliwatt is being dissipated in that
resistor, dBu and dBm are numerically equal in a 600 Ohm impedance
environment.
dBV dB relative to a reference value of 1 Volt.
Delay The interval between the instant at which a signal or force is applied or
removed and the instant at which a circuit or device subsequently responds in
a specified manner.
Dither The reduction of bits in a digital audio signal for use on a target system that
uses a smaller number of bits than the originating system.
DSP Digital Signal Processing. The art and science of digitally encoding analog
signals producing raw data, performing one or more mathematical routines on
the raw data to produce final data for use by other digital systems, and/or
conversion back to analog signals.
Filter A circuit or device which passes one frequency or frequency band while
blocking others, or vice versa.
Filter attenuation In a selective filter, the power, current, or voltage loss, in decibels, that takes
place within the passband.
Filter attenuation band The frequency band rejected by a band-suppression filter.
Filter cutoff The frequency at which the transmission figure of a filter is below its maximum
value by a prescribed amount (typically -3 dB).
Filter pass band The frequency band defined by the upper and lower cutoff frequencies of a
bandpass filter.
Filter stop band The attenuation band of a band-suppression filter. See FILTER
ATTENUATION BAND.
Gain See BOOST