Ashly Electronic Amplifier none Manual de usuario descargar pdf (Pagina 34)

dBV

Decibel Volts, an update of the dBm definition where 0 dBV = the same

voltage level as 0 dBm, but with no regard to power or impedance. 0 c"'V =

0.778 Volts. This unit is much more appropriate for modern i.^dio

equipment with high impedance inputs and low impedance outputs.

DISTORTION

Generally refers to ANY modification of an aulio signal whicn prodjces

new frequencies which were not in the original. Examples are harmnic

distortion, where a circuit adds overtones to a fundamental signal, and

intermodulation or IM distortion, where two frequencies beat together to

produc“ sum and difference frequencies.

FEEDBACK

Gene- ally '-e'-ers to any orocess where an output is in some form routed

back CO an input to establish a loop. Negative feedback tends to be be

self stabilizing, while positive feedback causes instability.

FILTER

A cii.uit «lesigned to pass some frequencies, but not others. There are

three general categories of filters; High-pass, band-pass, and low-pass.

The -'igh-pass filter passes frequencies above a certain limit, the low-

pass )asses frequencies below a limit, and the band-pass passes one group

of t. *^queru: les without passing those above or below. Our equalizer uses

band tass filters, crossovers use high and low-pass filters.

FREQUENCE

The

eye ’ t

seal e

epetition rate of a waveform. Frequency is measured in Hertz. One

per second (cps) is one He

the higher its frequency.

/ U T \

\ I I / .

higher a note on a niusii

FREQUENCV -(ESPONSE

Refers to relative gain ano loss at various frequencies across the audio

band. May be illustrated oy a graph called a frequency response plot,

usual' / graphing decibels vs. Hertz or octaves.

HERTZ (hz.

The iitiit of frequency measurement,

this ^.xplains it perfectlyl

(Formerly called Cycles-per-Second:

HEADROOM

Refers to the increase in level above normal operating level that can be

obtai'ied without clipping. Usually expressed in dB.

IMPEDANCi

Essen'lally the AC equivalent of resistance. It describes the drive

capability of an output, or the amount of drive required for an input at

any given signal level.

KHz

Kilonertz. 1,000 Hertz.

LEVEL

The magnitude of a signal, expressed in decibels or volts.

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