Lectrosonics SMV/941 handleiding
Handleiding
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SMV Series
LECTROSONICS, INC.
4
Servo Bias Input
The voltage and current requirements of the wide variety
of electret microphones used in professional applica-
tions has caused confusion and compromises in the
wiring needed for wireless transmitters. To address this
problem, the unique Servo Bias input circuit provides an
automatically regulated voltage over a very wide range of
current for compatibility with all microphones.
Digital Hybrid Wireless
®
Technology
All wireless links suer from channel noise to some degree,
and all wireless microphone systems seek to minimize the
impact of that noise on the desired signal. Conventional
analog systems use compandors for enhanced dynamic
range, at the cost of subtle artifacts (typically “pumping”
and “breathing”). Wholly digital systems defeat the noise by
sending the audio information in digital form, at the cost of
some combination of power, bandwidth and resistance to
interference.
Digital Hybrid systems overcome channel noise in a
dramatically new way, digitally encoding the audio in the
transmitter and decoding it in the receiver, yet still send-
ing the encoded information via an analog FM wireless
link. This proprietary algorithm is not a digital implemen-
tation of an analog compandor but a technique that can
be accomplished only in the digital domain, even though
the inputs and outputs are analog.
Because it uses an analog FM link, the Digital Hybrid
system enjoys all the benets of conventional FM wire-
less systems and it does away with the analog compan-
dor and its artifacts.
General Technical Description
No Pre-Emphasis/De-Emphasis
The Digital Hybrid design results in a signal-to-noise ratio
high enough to preclude the need for conventional pre-
emphasis (HF boost) in the transmitter and de-emphasis
(HF roll o) in the receiver. This eliminates the potential
for distortion of signals with abundant high-frequency
information.
Low Frequency Roll-O
The low frequency roll-o can be set for a 3 dB down
point at 35, 50, 70, 100, 120 and 150 Hz to control sub-
sonic and very low frequency audio content in the audio.
The actual roll-o frequency will vary slightly depending
upon the low frequency response of the microphone.
Excessive low frequency content can drive the transmit-
ter into limiting, or in the case of high level sound sys-
tems, can even cause damage to loudspeaker systems.
The roll-o is normally adjusted by ear while listening as
the system is operating.
Input Limiter
A DSP-controlled analog audio limiter is employed before
the A-D converter. The limiter has a range of more than
30 dB for excellent overload protection. A dual release
envelope makes the limiter acoustically transparent while
maintaining low distortion. It can be thought of as two
limiters in series, a fast attack and release limiter fol-
lowed by a slow attack and release limiter. The limiter
recovers quickly from brief transients, with no audible
side eects, and also recovers slowly from sustained
high levels to keep audio distortion low while preserving
short term dynamics.
Variable 1.8 - 4v
+6V
+5V
5V
Regulator
X1
11.289 MHz
X2
12.000 MHz
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Productinformatie
| Merk | Lectrosonics |
| Model | SMV/941 |
| Categorie | Niet gecategoriseerd |
| Taal | Nederlands |
| Grootte | 5751 MB |
