Crown GLM-200 Specifications download pdf (Page 21)

FISHMAN POCKET BLENDER

APPENDIX II: PHASE

WHAT IS PHASE?

Phase is the relationship between two signals or sound waves, originating from the same instrument.

For our purposes, Phase relationships are expressed as being either "in phase" or "out of phase".

In phase

tends to enhance, while

out

of phase

tends to suppress the natural characteristics of an instrument. A simple way to determine the quality of Phase (in or out) of two

sounds is to compare phase switch settings at low volumes.

IN PHASE

In phase

is when the waveforms of two signals

or sounds originating from the same instrument

are similarly aligned in time. Similar phase is

like looking at yourself in a mirror; your reflec-

tion directly follows your movement.

OUT OF PHASE

out of phase

is when the waveforms of two signals

or sounds originating from the same instrument

are aligned such that the upper peak of one wave

occurs at the same moment in time as the lower

peak of the other.

Out of phase

is like looking at

yourself in a live video monitor; the image you see

is similar, but the perspective is shifted. When you

move to the right, the image appears to move to

your left.

WHAT ARE THE POCKET BLENDER'S PHASE SWITCHES FOR?

The phase switches are useful for two reasons:

A. Due to the interactive and changing nature of phase, acoustic amplification depends on maintaining optimum phase relationships

between amplified instruments, sound systems and venues.

B. Since an industry standard for polarity has never been established for all sound equipment, the phase switches compensate for any

unintentional phase differences that might occur between components.

APPLICATIONS

When amplifying acoustic instruments with a microphone/pickup combination, there are two crucial phase relationships:

ACOUSTIC PHASE - The relationship between the sound waves of a mic'ed acoustic instrument and the speaker system.

ELECTRONIC PHASE - The relationship between pickup and microphone signals.

1 2 ... 16 17 18 19 20 21 22 23 24

No comments

Crown GLM-200 Specifications Page 21