Theatre Design & Technology - Oct 1965 - 15
effects and the movement s wh ich pan potent i ometers
supply, would require the pairing (at least) of
5. Beat Frequency asci Ilator (Genera I Radio
Model 1304B).
6. Sound Level Calibrator
speakers, each with its isolated circuit. Such elab-
(General
Radio
1552B).
oration cannot be achieved merely by adding program
7. Impedance
channe I s or two-channe I pan potent i ometers. In the
Bridge
(General
Radio Model
1650A).
sound system of the New York State Theatre, Lincoln
Center, a partial solution to this switching problem
has been achieved by means of a flexible matrix of
8. Distortion
interconnections
9. asci IIascope (Tektronix Model 593B with
Model (,12 Camera).
speakers.
This
between
is
not
program
unlike
channels
and
interconnection
of
10. Line
stagelighting load-and-line circuits. In that particular
installation
any
combination
of
speakers
can
Analyzer
(Hewlett
Packard
Model 330B).
Voltage
Regulator
(General
Radio
Model W5MT3AW "Variac").
be
switched to or from any of ten program channels, and
the state of the switching can be quickly ascertained,
from moment to moment, by visual inspection. 6
Rather than a need for more program channels, experience with the system described here has uncovered a different need in several cases where complex
effects were desirable in the use of sound around or
alongside
fects, or
Fami liarity
measuring
with the
nature
of
these
prafessiona I
instruments and high standards in oper-
ating procedure together constitute a cr;terion that
permits duplication of any test at a later date for
comparative
purposes
of
simi larities
and
differ-
the audience. Music, environmental efmoving sound effects were frequently
ences,
desirable on the same s ide of the audience at
the same time.
However, unti I circuit designs
charts
can
a
note on the difference between machine-run graphs
variable number of program channels to be fed into
and those plotted from individual measurements is
be
economically
developed
which
allow
a single power amplifier-speaker circuit at the same
time that it and some others are grouped on another
program channel without circuit feedback, overload,
attenuation, or distortion -- unti I such an ideal convenience is avai lab Ie, any such overlap of effects
would be expensive. Presently, it would require a
a
necessary
basis
to
insure quality com-
panents and promote reliable operation. Since many
are made in a series of tests like these, a
in order. The pen and chart speeds are shown on each
machine-run curve (Figures 4 and 5). The record of
the ratio of these two speeds is a very
revea ling
consideration since a change in these speeds alone
can
convert a
quality
of a
curve ex pos ing the
unit to
one touting
re lat ive Iy poor
its alleged, but
second set of power amplifiers and speakers paral-
illusory, professional quality.lfa frequency response
leling the present installation.
curve
were to be made at a pen speed of one inch
Testing
per second and the chart speed run at 75 inches per
minute, we could not expect to produce a curve that
While it is beyond the scope of this description to
contained much information. This setting would mean
cover testing procedures for such a system, the
"professional" standard of such a system is not es-
chart
tablished without such tests. For that reason neces-
sufficient time to allow the slow movement of the
sary testing equipment will be listed, important pro-
pen to deve lop a true pi cture of the peaks and dips
in a frequency response curve. To reveal the actual
variations
being
measured,
frequency response
cedures will be outlined, and sample results will be
provided.
Since the
particular models and manu-
that for everyone inch of rise or fall of the pen, the
facturer types specified for the components in this
curves
system were provided asasked,no "approved equal"
inches
would also move a
little over an inch: not
should be run at a pen
speed of 10 or 20
per second and the chart at a speed of 26
examination of performance quality had to be made. 8
inches per minute. Such ratios allow relatively accu-
Another specification, however, called for performance tests of the entire "effects" system in the
rate tracking.
University
response,
distortion,
level
TheCJtre:
equivalent
overall
input
reverberation
system
noise,
time,
and
frequency
overall
ambient
system
noise
The curves of Fig.
run, revea I the flat
amplifiers, program
at full rated output.
5, also the result of a machine
frequency response of the prechannels, and power amplifiers
Also listed for each situation is
tests were made. These were conducted by
the amount of equivalent input noise, a factor of the
Carl Colip, president of Commercial Electronics,
Inc., with the following instrumentation:
preamplifier stage, estimated in response to a 1,000
cycle signal fed into the preamplifier at -70 dbm.
1.
Sound Leve I Meter (Genera I Rad io Mode I
1551B).
2. Wave
Anolyzer
1554A).
(Generol
Radio
Model
3. Graphic Level Recorder (General Radio
1521A, with both 40 and 80 db. potentiometers ).
4. Random Noise Generator (General Radio
Model 1390B).
14
with a resultant
amplifier. Thi s
degree of noise
feren ce with the
output of -46 dbm. from the power
figure provides on estimate of the
inherent in the system and in interin format ion-carry ing potent ia I cf the
carrier wove in the system as well as a measure of
the gain. One of the weakest signals usually fed into
an effects system in the theatre, that of the microphone, is still safely stronger, if the specification
is met, than the equivalent input noise. As a result
there exists a favorable signal-to-noise ratio.
IUSITT
THEATRE DESIGN AND lECHNOlllGY
Table of Contents for the Digital Edition of Theatre Design & Technology - Oct 1965
Contents
Theatre Design & Technology - Oct 1965 - 1
Theatre Design & Technology - Oct 1965 - 2
Theatre Design & Technology - Oct 1965 - 3
Theatre Design & Technology - Oct 1965 - Contents
Theatre Design & Technology - Oct 1965 - 5
Theatre Design & Technology - Oct 1965 - 6
Theatre Design & Technology - Oct 1965 - 7
Theatre Design & Technology - Oct 1965 - 8
Theatre Design & Technology - Oct 1965 - 9
Theatre Design & Technology - Oct 1965 - 10
Theatre Design & Technology - Oct 1965 - 11
Theatre Design & Technology - Oct 1965 - 12
Theatre Design & Technology - Oct 1965 - 13
Theatre Design & Technology - Oct 1965 - 14
Theatre Design & Technology - Oct 1965 - 15
Theatre Design & Technology - Oct 1965 - 16
Theatre Design & Technology - Oct 1965 - 17
Theatre Design & Technology - Oct 1965 - 18
Theatre Design & Technology - Oct 1965 - 19
Theatre Design & Technology - Oct 1965 - 20
Theatre Design & Technology - Oct 1965 - 21
Theatre Design & Technology - Oct 1965 - 22
Theatre Design & Technology - Oct 1965 - 23
Theatre Design & Technology - Oct 1965 - 24
Theatre Design & Technology - Oct 1965 - 25
Theatre Design & Technology - Oct 1965 - 26
Theatre Design & Technology - Oct 1965 - 27
Theatre Design & Technology - Oct 1965 - 28
Theatre Design & Technology - Oct 1965 - 29
Theatre Design & Technology - Oct 1965 - 30
Theatre Design & Technology - Oct 1965 - 31
Theatre Design & Technology - Oct 1965 - 32
Theatre Design & Technology - Oct 1965 - 33
Theatre Design & Technology - Oct 1965 - 34
Theatre Design & Technology - Oct 1965 - 35
Theatre Design & Technology - Oct 1965 - 36
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