Schoeps VMS 5 U Manual de usuario descargar pdf (Pagina 11)

11

11. Connecting headphones

Any stereo headphones with an

impedance of 32 to 2,000 Ohms can

be connected to the headphone out-

put of the VMS 5 U. Headphones with

a miniature plug can be used with a

commonly available adapter.

The headphone output is used for

monitoring; a switch <9> selects either

the unaltered "PREAMP" signals (e.g.

for A/B, X/Y or ORTF-style recording)

or the "MATRIX" outputs (left and right

signals derived from an M/S recording

setup).

Please note: When turning phan-

tom power on or off, or when setting

the input selector switch, please turn

the headphone volume control to its

minimum setting.

In the interest of hearing conserva-

tion, do not monitor at high sound

levels. Prolonged listening through

headphones at high levels can damage

your hearing more severely than listen-

ing at what may seem like the equiva-

lent level on loudspeakers.

12. M/S recording / WIDTH

M/S is used primarily when recording

sound for film or television, but is also

useful for music recording. Its advan-

tage is that the stereo image can be

adjusted after the recording has been

made, in post-production.

The principle of M/S: As with other

stereo recording techniques (A/B, X/Y,

ORTF, "Blumlein" etc.) two micro-

phones are used, of which one (the

"side" or "S" channel) must have a

figure-8 directional pattern; the other

microphone (the "mid" or "M" chan-

nel) may have any desired pattern. The

two microphones are placed one

directly above the other, but while the

M-channel microphone is aimed at the

sound source, the S-channel micro-

phone is aimed 90º to the left (see

illustration, top of page 12). Thus the

two microphones do not directly pick

up the left and right channel playback

signals; instead, these signals are

derived by means of a sum-and-differ-

ence matrix circuit such as the one in

the VMS 5 U. The left channel play-

back signal is formed by adding M+S,

while the right channel playback signal

is formed by subtracting M-S. This

works because the two lobes of a fig-

ure-8 microphone’s pattern are in

opposite polarity to one another.

The result is as if two "virtual micro-

phones" had been aimed symmetrical-

ly with respect to the main axis of the

actual M-channel microphone. The

directional pattern of these "virtual

microphones" depends on the actual

pattern of the M-channel microphone

as well as on the setting of the "WIDTH"

control <6>, which determines the rel-

ative gain applied to the M and S sig-

nals fed into the matrix.

The "WIDTH" control sets the width

of the stereophonic image. The useful

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