Polycom SoundStation VTX1000 Bedienungsanleitung

CONFIGURING THE

SOUNDSTATION VTX1000

FOR AUDITORIUM USE

WHITE PAPER

Jeff Rodman

Fellow/CTO

February 25, 2003

[email protected]

POLYCOM,THE POLYCOM LOGO,SOUNDSTATION AND VIEWSTATION ARE REGISTERED TRADEMARKS,

AND SOUNDSTATION VTX 1000, VORTEX AND iPOWER ARE TRADEMARKS OF POLYCOM,INC.IN THE

UNITED STATES AND OTHER COUNTRIES.ALL OTHER TRADEMARKS ARE THE PROPERTY OF THEIR

RESPECTIVE COMPANIES.

CONFIGURING THE SOUNDSTATION VTX1000 FOR AUDITORIUM USE

Polycom, Inc. Page 2 of 6

INTRODUCTION

The VTX 1000 is normally used in conference rooms, but it can be adapted for a wide

variety of settings. One of these is the large auditorium, where you occasionally want the

audience to listen to a phone call from someone on stage.

There are three main steps in setting up in an auditorium: train the audio engineer, set up

and test the system, and train the presenter.

STEP ONE: TRAIN THE AUDIO ENGINEER

It’s best if the audio engineer reads this note before beginning to set up, because the VTX

1000 doesn’t work the same as other audio systems. Here are a few key points:

¾The VTX 1000 has built-in AGC, noise reduction, gating, adaptive filtering,

and other functions. These cannot be disabled; they’re essential to its

working correctly.

¾Only use filters if needed, not reverb, limiters, or other dynamic effects.

¾Place a couple of test calls during the setup to get the levels just right.

¾Don’t “ride” the levels during the call. Leave them alone.

¾Keep gains to the lowest that's acceptable.

STEP TWO: CONFIGURE AND TEST THE SYSTEM

1. SET UP THE VTX 1000

You are going to replace the VTX 1000’s internal microphones and speaker with

external microphones and speaker.

a. ENABLE THE EXTERNAL INPUT. Through the keyboard interface (MENU ->

AUDIO SETUP -> AUX INPUT), change the function of AUX IN to ON by pressing

ON, then SAVE (remember to press SAVE!)

b. ENABLE THE EXTERNAL OUTPUT. Through the keyboard interface, (MENU ->

AUDIO SETUP -> AUX OUTPUT), change the function of AUX OUT by pressing

EXT SPEAKER, then SAVE.

CONFIGURING THE SOUNDSTATION VTX1000 FOR AUDITORIUM USE

Polycom, Inc. Page 3 of 6

c. TURN OFF THE INTERNAL MICS. Through the keyboard interface, (MENU ->

AUDIO SETUP -> CONSOLE MICS), turn the console mics OFF (again, press

SAVE!).

d. TURN OFF THE INTERNAL SPEAKER. Through the keyboard interface, (MENU

-> AUDIO SETUP -> CONSOLE SPEAKER), turn the console speaker OFF.

e CONNECT THE EXTERNAL MICROPHONE.

i. Connect the talker's microphone to AUX IN. This will commonly be

done through the room mixer panel. The connection to AUX IN is usually

made through a direct box. AUX IN is a line-level unbalanced signal,

appearing on a phono-style connector on the Palomod (the rectangular grey

box that is connected between the triangular console and the telco and

power jacks at the wall).

ii. Set the mixer to "solo" the talker's mic to AUX IN. That is, only the

talker's mic should be present at AUX IN. Room audio, or any other signal,

should not be present here.

f. CONNECT THE EXTERNAL SPEAKER. Connect AUX OUT to the auditorium PA

system. This is normally done through another direct box to the auditorium mixer

panel. The auditorium mixer can combine this VTX output with the presenter's

microphone, and other sound sources as desired. When set to "EXT SPEAKER" as

described above, AUX OUT will carry audio from the far end, as well as dialtone,

ring tones, and so on. AUX OUT is a phono jack carrying a line-level unbalanced

signal.

g. SET CONSOLE VOLUME. Set console VOUME to maximum. This gives the

lowest noise level, and you will use your mixer to adjust the level from the room

speakers.

2. ADJUST THE AUDITORIUM AUDIO

WARNING!

IT IS CRITICAL TO MINIMIZE MIC PICKUP.

The VTX 1000 is much more sensitive to feedback than a

normal sound system, so:

KEEP GAINS LOW!

DON’T CHANGE THE GAINS DURING USE!

TALKER, STAND AWAY FROM ROOM SPEAKERS!

Here's what to listen for: if you have this problem, you won't hear it as feedback

oscillation. Instead, the VTX 1000 will partially gate the far end, and you'll hear the

loudness from the far end flipping up and down.

CONFIGURING THE SOUNDSTATION VTX1000 FOR AUDITORIUM USE

Polycom, Inc. Page 4 of 6

a. CHOOSE A MICROPHONE

The best approach is to use a good-quality, wireless clip-on microphone such as the

Polycom Cordless Lapel Microphone, and attach it high up on the presenter's shirt or coat.

This keeps the mic close to the the mouth, which allows its gain to be kept low, and this

cuts down the amount of room audio that it picks up.

You can also use a microphone stand if it is away from the room speakers, although the

mic gain needs to be kept very low. The presenter will have to be 1 — 2 inches from the

mic when talking. Singers are accustomed to working this close, but business talkers are

often uncomfortable. So a lapel mic is best.

b. ADJUST THE GAINS. Place a call to a second VTX 1000. Use the one you'll actually

be calling, if you can. Have someone talk at the far end (use human speech to set all your

levels, not test signals). Listen for gating of the sound, either at the near end, or the far

end. Here are the critical gains.

¾Lapel mic to the room speakers. Set the volume to the lower end of the

acceptable range. Don't turn it up any louder than needed.

¾VTX to the room speakers. Set the volume in the same way: for the lowest

loudness that is acceptable.

¾Lapel mic to the VTX. Line level is usually OK. The VTX applies AGC to

this path, so you won't find this adjustment to be too critical.

c. TURN OFF SIGNAL PROCESSING.

Don't use any special or nonlinear effects during the call. Gating, companding, flanging,

reverberation, distortion, or "aural expanding", for example, will badly confuse the VTX

1000. Some EQ, such as a graphic or parametric equalizer, is fine..

Remember that the VTX 1000 applies a variety of nonlinear techniques internally,

including compression, limiting, gating, dynamic frequency equalization, and adaptive

echo cancellation. These are essential to its function, and cannot be disabled.

If it is desired for the far end to inject recorded sound, this can be done by setting the far-

end unit AUX IN to EXT Microphone (in the same way that the auditorium's unit is set),

and connecting a CD player, FM radio, laptop, and so on, to its AUX IN jack. Note that

this unit will select the loudest source from among all its inputs, so if someone speaks

while a CD is playing, the CD may be blocked out if the unit decides that the talker is

louder.

CONFIGURING THE SOUNDSTATION VTX1000 FOR AUDITORIUM USE

Polycom, Inc. Page 5 of 6

STEP THREE: TRAIN THE PRESENTER

These are the key points for the presenter to remember.

¾Talk close to the microphone

¾Don't stand directly in front of any loudspeaker

¾Neither side should interrupt any more than necessary

CONCLUSION

While this configuration will not perform quite as well as when the VTX 1000 is operating

in its native environments (in particular, interaction will suffer somewhat), it is effective in

extending its usefulness on those occasions where a telephone conversation needs to be

shared with a larger group. In situations where this is a regular application, however, an

installed audio system such as the Polycom Vortex will yield better and more consistent

results.

TROUBLESHOOTING

Here are some typical problems, and what to do about them.

PROBLEM CAUSE SOLUTION

Auditorium hears far-end

loudness pumping up and

down.

Too much speaker sound

getting into microphone.

With the VTX 1000, this

causes "pumping" instead of

feedback oscillation, as the

VTX 1000 gates feedback..

> Turn down gains

> Move talker away from

speakers

> Move far-end talker closer

to microphone

Auditorium hears far-end

loudness pumping up and

down.

Panel gains are being

changed during the call,

which keeps VTX 1000 echo

cancellers from adapting

correctly

Leave panel settings alone

during the call

VTX 1000 doesn’t work

afterwards: lights OK but no

sound.

Internal mics and speaker

are still turned off

Turn on internal mics and

speaker (MENU -> AUDIO

SETUP)

Buzz or hum on audio from

VTX 1000 into auditorium

Unbalanced cable from

AUX OUT is too long

Install direct box at VTX

1000 interface module and

use a balanced microphone

CONFIGURING THE SOUNDSTATION VTX1000 FOR AUDITORIUM USE

Polycom, Inc. Page 6 of 6

cable for the long run back

to the mixer panel.

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