SoundPals DMIC-24 Manuale utente

SoundPals™

DMIC-24 User Guide

Dual Microphone Pre-amp

-to-D converter

Graham-Patten is a division of

Printing History

SoundPals™DMIC-24 Microphone Amplifier & A-to-D converter

Rev. N/C

March 2007

Printed in U.S.A.

Part Number 08-2048-00

The information contained in this guide is subject to change without notice or obligation.

Copyrights and Trademarks

Contents of this publication may not be reproduced in any form without the written permission of Graham-Patten.

Reproduction or reverse engineering of copyrighted software is prohibited.

FCC Compliance

This equipment has been tested and found to comply with the limits for a Class A digital device pursuant to Part 15

of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference when the

equipment is operated in a commercial environment. This equipment generates, uses, and can radiate radio

frequency energy and, if not installed and used in accordance with the instruction manual, may cause harmful

interference to radio communications. Operation of this equipment in a residential area is likely to cause harmful

interference in which case the user will be required to correct the interference at your own expense.

Warranty Statement

Graham-Patten warrants that the equipment it manufactures is free from defects in workmanship and materials and

meets applicable published specifications. Equipment that has been operated within published ratings and has not

been subjected to abuse or modification, and which fails because of such defects, will be replaced or repaired at the

Company’s discretion if it is returned, freight prepaid, to Graham-Patten within seven years of receipt.

This warranty supersedes all other Warranties, express or implied. Graham-Patten is not liable for any

consequential damages.

Company Address

GRAHAM-PATTEN SYSTEMS, INC.

119 East McKnight Way, Unit A

Grass Valley, California 95949

Telephone: (888) 622-4747, (530) 477-2984

Fax: (530) 477-2986

e-mail: [email protected]

World Wide Web: www.gpsys.com

Table of Contents

ii • Table of Contents DMIC-24 User Guide

Table of Contents ii

Introduction 1

What are SoundPals?.............................................................................................................. 1

Documentation Conventions.................................................................................................... 1

Signals and Values .................................................................................................................. 1

Warnings.................................................................................................................................. 1

Unpacking and Inspection ....................................................................................................... 2

Power Supply Note .................................................................................................................. 2

DMIC-24 3

About the DMIC-24 .................................................................................................................. 3

DMIC-24 Installation ................................................................................................................ 5

Connecting Power ............................................................................................................. 5

Connecting Inputs ............................................................................................................. 5

Connecting Outputs........................................................................................................... 5

Using Phantom Power ...................................................................................................... 5

DMIC-24 Operation.................................................................................................................. 6

DMIC-24 Interconnection.........................................................................................................6

Basic - Analog Mic Input to Digital Mixer........................................................................... 6

Advanced - Sub-Mix from Analog Equipment ................................................................... 7

DMIC-24 Internal Jumpers....................................................................................................... 8

DMIC-24 Troubleshooting...................................................................................................... 10

DMIC-24 Specifications .........................................................................................................11

Audio Specifications ........................................................................................................ 11

Environmental Specifications and Dimensions ............................................................... 11

Inside the Module ........................................................................................... 12

In This Section ....................................................................................................................... 12

Before You Begin................................................................................................................... 12

Opening the Module ..............................................................................................................12

Closing the Module ................................................................................................................ 12

External Power ................................................................................................ 13

About Power Supplies ...........................................................................................................13

CE Compliance...................................................................................................................... 13

Portable Power Sources ........................................................................................................ 13

Power Supply Specifications ................................................................................................. 13

Power Supply Sources .......................................................................................................... 14

Introduction

DMIC-24 User Guide Page 1

What are SoundPals?

Each Graham-Patten SoundPals module is essentially a digital audio building block that can be

used independently, or interconnected to perform more advanced mixing and audio processing

functions.

SoundPals can be used in both standalone and system configurations:

•In a “standalone” configuration, each SoundPals module is designed to perform a specific

audio processing function such as ADAT-to-Analog conversion. In this way, each module

functions as a perfect low-cost adjunct to larger mixing consoles (such as the Graham-

Patten D/ESAM series) — for single-purpose processing tasks.

•In a “system” configuration, SoundPals can be linked to form more comprehensive digital

audio tools. For field recording, studio applications, and workstation applications,

SoundPals can be used to seamlessly perform functions that would otherwise require

extensive peripheral gear. Best of all, SoundPals “systems” can be re-configured quickly

and easily — to suit your changing audio production requirements.

All SoundPals modules are extremely compact, rugged, and identical in size for ease of

installation, interconnection, and use. In addition, SoundPals support AES3id. This allows longer,

more robust AES signal distribution using standard coaxial cable. Error free distances of 1000

feet can be attained using inexpensive coaxial cables.

Documentation Conventions

The following documentation conventions are used in this guide:

•Buttons, knobs, connectors, and switches are indicated in bold-faced capital letters. For

example:

Adjust the left GAIN TRIM to …

•Primary sections are listed in bold text, with a line above:

Primary Section

•Secondary sections are listed in bold text, with no line:

Secondary Section

Signals and Values

Note the following important information regarding audio signal level:

•0 dBu = 0.778Vrms

•AES3 = Balanced output with 2 channels of digital audio (left and right)

•AES3id = Unbalanced output with 2 channels of digital audio (left and right)

Warnings

Please observe the following important warnings:

•Heed all warnings on the unit and in the instructions.

•Do not use this product in or near water.

•Route power cords and other cables so that they are not likely to be damaged.

Disconnect power before cleaning. Do not use liquid or aerosol cleaners; use only a

damp cloth.

DMIC-24 User Guide

Page 2

Unpacking and Inspection

When you receive your SoundPals modules, inspect the cartons for signs of damage. Contact

your dealer and the shipper immediately if you suspect any damage has occurred during

shipping. Check the contents of each box to be sure that all parts are included. If any items are

missing, contact your dealer immediately.

Power Supply Note

SoundPals are delivered with a power connector only. A separate power supply must be

obtained. Graham-Patten offers several power solutions for both domestic and international

customers. Refer to “External Power” for detailed power specifications for users who wish to

configure their own power source, rather than purchase one from Graham-Patten.

DMIC-24

DMIC-24 User Guide Page 3

About the DMIC-24

The SoundPals DMIC-24 is a dual microphone pre-amplifier with a built-in, 24-bit analog-to-digital

AES converter. The unit takes two low-level, low-impedance inputs, amplifies the signals, and

converts them to one AES output on both XLR and BNC outputs.

The DMIC-24 offers the following features:

•Sensitivity adjustments in 5 dB steps (-20 to -60 dBu)

•LED level indicators for normal and overload conditions

•Support for phantom power with Enable/Disable switch

•Significant status bits selectable with internal dip switch

•Two low-level, low-impedance inputs on XLR connectors

•One AES balanced output (XLR), plus one simultaneous unbalanced output (DATS on

BNC)

•Recessed DIP switches, well-suited to field work

•Optional rack mounting tray (1 RU)

•Compact size, rugged construction

Two versions of the DMIC-24 are available:

•44.1 KHz Model

This model defaults to 44.1 KHz, via the internal crystal. However, if an external

reference is applied to the AES REF connector, the output frequency will lock to the

reference.

•48 KHz Model

This model defaults to 48 KHz, via the internal crystal. However, if an external reference

is applied to the AES REF connector, the output frequency will lock to the reference.

NOTE The printed legend on the rear panel indicates the default frequency.

The figure below illustrates the DMIC-24’s front panel:

DMIC-24

AES OU T

12345678

-60

-50

-40

-30

12345678

-60

-50

-40

-30

SENSITIVITY

-60

-20

-3

LEVEL

EXT

REF

1 2 3 4 6

PWR

1) Left Mic Sensitivity —the 8-position DIP switch adjusts left microphone sensitivity in 5

dB steps (-20 to -60 dBu).

2) Right Mic Sensitivity — the 8-position DIP switch adjusts right microphone sensitivity in

5 dB steps (-20 to -60 dBu).

3) AES Unbalanced Output — provides AES unbalanced output via BNC. Output is

concurrent with the rear panel balanced output (XLR) — both can be used

simultaneously.

DMIC-24 User Guide

Page 4

4) AES Reference LED — the EXT REF LED lights when the sampling frequency is locked

to the externally supplied AES reference signal. The LED is an indication only, not an

alarm.

5) Level Indicator LEDs — provides level indication for each input (calibrated in dB).

When properly adjusted, the following levels are indicated:

•-60 dB: signal present

•-20 dB: normal digital reference level

•-3 dB: approaching clipping

•0dB: A/D converter is clipping

6) Power LED — the large green LED below the power jack lights when power is applied.

The figure below illustrates the DMIC-24’s rear panel:

AES OUT AES REF RIGHT IN LEFT IN

44.1 KHZ

MADE IN THE USA

4 5 6 7

PHANTOM

PWR

+6V

1) DMIC-24 Version — the printed legend indicates the default frequency (either 44.1 KHz

or 48 KHz).

2) Power Connector — accepts the power jack from the 6VDC power supply. Refer to

“External Power” for more information regarding external power.

3) Phantom Power Switch — applies 48 V phantom power to both microphone inputs,

when in the UP (on) position. In the DOWN (off) position, phantom power is not applied.

4) AES Balanced Output — provides AES balanced output via XLR connector. Output is

concurrent with the front panel’s AES unbalanced output (BNC) — both can be used

simultaneously.

5) AES Reference Input — the AES REF connector accepts an AES reference signal

(between 30 KHz and 50 KHz sampling rate). Only timing information is used; audio

content (if any) is ignored. See the “Connecting AES Reference” section for information

on switching frequencies via the reference signal.

6) Right Analog Microphone Input — accepts right channel mic level analog input. The

input level is adjustable via the Right Mic Sensitivity DIP switches on the front panel.

7) Left Analog Microphone Input — accepts left channel mic level analog input. The input

level is adjustable via the Left Mic Sensitivity DIP switches on the front panel.

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