Servo Bias Input And Wiring; Dsp-Controlled Input Limiter; Recorder Function; Encryption - Lectrosonics DBSM Instruction Manual

Servo Bias Input and Wiring

The input preamp is a unique design that delivers
audible improvements over conventional transmitter
inputs. Two different microphone wiring schemes are
available to simplify and standardize the configuration.
Simplified 2-wire and 3-wire configurations provide sev-
eral arrangements designed for use only with servo bias
inputs to take full advantage of the preamp circuitry.
A line level input wiring provides an extended frequency
response with an LF roll-off at 20 Hz for use with instru-
ments and line level signal sources.

DSP-controlled Input Limiter

The transmitter employs a digitally-controlled analog
audio limiter prior to the analog-to-digital converter.
The limiter has a range greater 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,
connected as a fast attack and release limiter followed
by a slow attack and release limiter. The limiter recovers
quickly from brief transients, so that its action is hidden
from the listener, but recovers slowly from sustained
high levels to keep audio distortion low and preserve
short term dynamic changes in the audio.

Recorder function

The DBSM/DBSMD has a built in recording function
for use in situations where RF may not be possible or
to work as a stand alone recorder. The record function
and transmit functions are exclusive of each other - you
cannot record AND transmit at the same time. When the
unit is transmitting and recording is turned on, the audio
in the RF transmission will stop, but the battery status
will still be sent to the receiver.
The recorder samples at 48 kHz rate with a 24 bit
sample depth. The micro SDHC card also offers easy
firmware update capabilities without the need for a USB
cable or driver issues.

Encryption

When transmitting audio, there are situations where
privacy is essential, such as during professional sport-
ing events, in court rooms or private meetings. For
instances where your audio transmission needs to be
kept secure, without sacrificing audio quality, Lectroson-
ics implements AES256 encryption in our digital wire-
less microphone systems. High entropy encryption keys
are first created by a Lectrosonics receiver such as the
DSQD Receiver. The key is then synced with the DBSM
via the IR port. The transmission will be encrypted
and can only be decoded if the receiver and transmit-
ter have matching encryption keys. If you are trying to
transmit an audio signal and keys do not match, all that
will be heard is silence.
Rio Rancho, NM
Digital Hybrid Wireless Belt-Pack Transmitters
Compatibility with
microSDHC memory cards
Please note that the DBSM/DBSMD are designed
for use with microSDHC memory cards. There are
several types of SD card standards (as of this writing)
based on capacity (storage in GB).
SDSC: standard capacity, up to and including 2 GB –
DO NOT USE!
SDHC: high capacity, more than 2 GB and up to and
including 32 GB – USE THIS
SDXC: extended capacity, more than 32 GB and up to
and including 2 TB – DO NOT USE!
SDUC: extended capacity, more than 2TB and up to
and including 128 TB –
The larger XC and UC cards use a different formatting
method and bus structure and are NOT compatible with
the recorder. These are typically used with later genera-
tion video systems and cameras for image applications
(video and high resolution, high speed photography).
ONLY microSDHC memory cards should be used. They
are available in capacities from 4GB to 32GB. Look for
the Speed Class 10 cards (as indicated by a C wrapped
around the number 10), or the UHS Speed Class I
cards (as indicated by the numeral 1 inside a U sym-
bol). Also note the microSDHC Logo.
If you are switching to a new brand or source of card,
we always suggest testing first before using the card on
a critical application.
The following markings will appear on compatible
memory cards. One or all of the markings will appear on
the card housing and the packaging.
Speed Class 10
UHS Speed Class 1
microSDHC Logo is a trademark of SD-3C, LLC
TYPE.
DO NOT USE!
Stand-alone
UHS Speed Class I
Accompanying
microSDHC logo
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