Instruction Manual

HHa
LECTROSONICS, INC.
4
, HHa-941, HHa/E01, HHa/E02, HHa/E06, HHa/E07-941, HHa/X
General Technical Description
Introduction
The HHa handheld transmitter uses state-of-the-art
Digital Hybrid Wireless
®
wireless technology, select-
able output power and a versatile microphone capsule
mounting system to meet the needs of audio profes-
sionals and vocalists.
The compandor-free Digital Hybrid audio chain pre-
serves the quality of the selected microphone capsule
and delivers it to the sound and recording system
without coloration. This superb audio performance and
highly reliable RF transmission makes it ideally suited
for high end stage and studio production.
Digital Signal Processor
The DSP encodes the digitized audio from the A-D
converter and adds an ultrasonic pilot tone to control
the receiver’s squelch in systems that use pilot tone. It
also controls the input limiter and audio metering.
Compatibility Modes
The transmitter was designed to operate with Lec-
trosonics Digital Hybrid Wireless
®
receivers and will
yield the best performance when doing so. Along with
providing peerless audio quality with wide frequency
response and dynamic range in Digital Hybrid and Nu
Hybrid modes, the technology used in the HHa in-
cludes compatibility modes for Lectrosonics 200
Series, Lectrosonics 100 Series, Mode 3 and IFB
receivers, as well as certain non-Lectronics analog
receivers in special compatibility modes. Contact the
Lectrosonics Sales Department for a complete list of
compatible receivers.
WARNING: Compatibility modes depend on
model. See specs for detailed informaiton.
Digital Hybrid Wireless
®
Technology
All wireless links suffer 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 to
increase the signal to noise ratio, at the cost of distor-
tion artifacts. Wholly digital systems defeat the noise
by sending the audio information in digital form, at
the cost of some combination of power, bandwidth or
channel count.
The Lectrosonics Digital Hybrid Wireless
®
system over-
comes channel noise by digitally encoding the audio
in the transmitter and decoding it in the receiver, yet
still sending the encoded information via an analog FM
wireless link. This proprietary algorithm is not a digital
implementation of an analog compandor. Instead, it
is a technique that can be accomplished only in the
digital domain, even though the inputs and outputs are
analog signals.
Because it uses an analog FM link, the system enjoys
all the benefits of conventional FM wireless systems,
such as excellent range, efficient use of RF spectrum,
and long battery life. However, unlike conventional FM
systems, the design has eliminated the analog com-
pandor and its artifacts.