Lectrosonics HH User Manual download pdf (Page 3)

Hand Held Transmitter

Rio Rancho, NM

General Technical Description

Introduction

The HH 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. Due to

the ﬂexibility of digital signal processing, however, the

transmitter is also able to operate with Lectrosonics

200 Series, Lectrosonics 100 Series, IFB and certain

non-Lectrosonics analog receivers in special compat-

ibility modes. (Contact the Lectrosonics Sales Depart-

ment for a complete list of compatible receivers.)

Digital Hybrid 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 (also

called Digital Hybrid) overcomes channel noise by

digitally encoding the audio in the transmitter and de-

coding it in the receiver, yet still sending the encoded

information via an analog FM wireless link.

This proprietary algorithm is not a digital implementa-

tion 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 Digital Hybrid

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 Digital Hybrid has elimi-

nated the analog compandor and its artifacts.

Wide Deviation

±75 kHz deviation is used in the Digital Hybrid and 200

Series compatibility modes to dramatically improve the

capture ratio, signal to noise ratio and dynamic range

of the wireless system. This, in conjunction with ac-

curate input gain adjustment, produces dynamic range

and signal to noise ratio.

Mic

capsule

Bias 5V

+7V

Input

Amp

Interface

Shunt

Limiter

MENU/SEL

BACK

MUTE

POWER

Reference

Crystal

Reference

Crystal

3 V

Battery

Variable

Switching

Power

Supply

Hi.Lo

Pass

Filter

Digital

Pot

Audio

Level

Phantom

Power

Audio

A-D

Converter

11001001

D-A

Converter

11001001

Control Panel

Microprocessor

Voltage

Controlled

Oscillator

Final

Amplifier

Ohms

Isolator

Filter

Amp

Encoded Audio

and Pilot Tone

Bicolor

Modulation

LEDs

Switching

Power

Supply

Digital Signal Processor

Phase Locked Loop

LCD

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Lectrosonics HH User Manual Page 3

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