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Manual-9

Figure 15. The Hard Knee compression characteristic has a 0 dB span.

The Soft Knee compression characteristic has a 10 dB span.

SIDE-CHAIN Mode and Listen

-10

+10

-9

-8

-7

-6

-5

-4

-3

-2

-1

-10 +10-9 -8 -7 -6 -5 -4 -3 -2 -1 0+1+2+3+4+5+6+7+8+9

Input dBu

Threshold

Hard

Soft

10 dB span

SIDE-CHAIN Parametric EQ

Comp selects Compressor mode for the channel.

Dynamic EQ selects this mode for the channel.

Tip: A small  pointer next to a control indicates a typical set-

ting for De-essing.

Listen routes the side-chain signal to the channel output, allow-

ing you to hear exactly what the detector “hears,” and is especial-

ly useful when making precise PEQ adjustments for frequency

sensitive compression or de-essing. e yellow indicator ashes

when Listen is engaged, as a friendly reminder to toggle back to

Comp or Dynamic EQ mode before show time.

e Listen source depends on the selected mode (Comp or

Dynamic EQ), so the switch operates as follows: when switch-

ing from Comp to Listen, the Comp indicator remains lit and

the Listen indicator ashes, which signies you are listening

to the Compressor side-chain PEQ response. When the switch

is moved to Dynamic EQ, the Listen and Comp indicators

are turned o and the Dynamic EQ indicator is lit. When the

switch is then moved from Dynamic EQ to Listen, the Dynamic

EQ indicator remains lit and the Listen indicator ashes, which

signies you are listening to the Dynamic EQ response.

Remember: once the show begins the audience never hears

the ltered side-chain signal – unless you accidentally leave

Listen mode engaged, of course. If something sounds a bit odd

during the gig, look over at the C4 and see if any of the yellow

Listen lights are ashing. If so, casually saunter over to the rack

and toggle the side-chain out of Listen mode…as if you meant

to have it engaged for the rst six songs.

e Side-chain PEQ lter operates in one of two ways, depend-

ing on whether the channel is operating in Compressor mode or

Dynamic EQ mode.

PEQ in Compressor Mode

In Compressor mode, the PEQ section operates as a normal,

-order, parametric lter with independent BANDWIDTH,

FREQUENCY and GAIN controls. e GAIN control has a

center detent position indicating 0 dB, or unity gain. Use the

PEQ to adjust the sensitivity of the rms detector to specic

frequencies. Boosting a particular frequency makes the detector

more sensitive to this frequency, while cutting makes it less sensi-

tive. Broadband compression still takes place; the lter does not

directly aect the frequency response of the main signal, as is

done with the Dynamic EQ used in de-essing.

Example: reducing detector sensitivity to low frequencies

helps avoid the pumping and breathing often associated with

compressing an overall mix of instruments. Start by engaging

Listen mode and set the PEQ Gain to –12 dB with a bandwidth

of 1 to 2 octaves. Adjust the frequency and bandwidth controls

until most of the low frequency sound disappears (125 Hz is a

good start). Oh…and don’t forget to dis-engage Listen mode

when you’re done.

PEQ in Dynamic EQ Mode

In Dynamic EQ mode, the PEQ controls dene a bandpass lter

in the side-chain and a Dynamic EQ in the main signal path.

e dierence in the rms level of the broadband signal and that

of the bandpassed side-chain signal is compared to the threshold,

and the Dynamic EQ’s gain is automatically adjusted to main-

tain the proper ratio of sibilant to non-sibilant content.

See the examples in the Dynamci EQ Applications section on

page Manual-4.

dBHzoct

0.5

20k

640

125

3.15k

20 +12-12

GAIN

FREQUENCYBANDWIDTH

PEQ

SIDE-CHAIN

Listen Dynamic

Comp

1 2 ... 7 8 9 10 11 12 13 14 15

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Motorola 3460 Manual de usuario (188 paginas)

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Motorola

Appendix C. Specifications

About This Guide

Mise en Garde

Trademarks

Motorola Customer Information

Customer Response Card

BUSINESS REPLY MAIL

Chapter 1

Hardware Installation

Step Action

Power Transformer

Connecting Ports

Avertissement

Site and Power Preparation

One or Two Enclosures

Three or More Enclosures

Vorsicht

Group Country

Configurations

Installing a Modem Card

Removing a Modem Card

AC Power Module

DC Power Module

2.5-4 cm

Vanguard Enclosure

Chapter 2

Basic Modem Setup

Asynchronous Operation

Fax Setup on Windows

Chapter 3

Advanced Modem Setup

What is the Configuration?

Issuing AT Commands

What Are Option Sets?

Managing Option Sets

Non-Option Set Parameters

Access Security Functions

Restriction

Outbound Dial Restriction

Quiet Answer

Network Management (AT*NE)

Option Description

Parameter Option Comment

Chapter 4

Fast’RVu

Getting Started With Fast’RVu

Language Options

Useful Information

Entering Commands

Remote Modem

Downloading Modem Software

Troubleshooting Steps

Troubleshooting Actions

Running Diagnostic Tests

Appendix A

Regulatory Information

EEC Directive Conformity

100

3460 Fast’R

101

Regulatory Marking

103

Limitations

104

(508) 261-4000

107

• UL, CSA, and TUV

110

Attention (AT) Commands

111

(continued)

112

141

(Default

141

Value) Description

141

Result Messages and Codes

144

Appendix C

149

Specifications

149

Physical Characteristics

150

Operating Modes

151

Environmental Limits

152

Electromagnetic Compatibility

153

Power Requirements

154

Connectors and Interfaces

156

LINE A Connectors

157

LINE B Connectors

157

Pin NM OUT NM IN

159

Power Interface

159

Power Type Connector

159

Step Stage

159

DIAL Connector

160

LEASE Connector

160

Computer Interface

161

Pin Circuit Function

161

LINE* Connector

162

PHONE Connector

162

PHONE/LINE Connector

162

Stand-Alone 3460 Fast’R Modem

165

Status LED Displays

167

LED Description

167

Light Bar Displays

168

This: Indicates

168

Compatibility

169

Appendix D

171

Parameters, and Options

172

MR TR OH

173

CD RD SD

173

Button Function

174

Return Procedures

175

Introduction

175

Equipment Return Procedures

175

Factory Repair

176

Numerics

177

Index (continued)

178

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