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www.gentner.com
Audio Products
GT1524 Single Channel Echo Canceller
Installation & Operation Manual
ClearOne Communications ~ 1825 Research Way, Salt Lake City, UT 84119 ~ tel 1-800-945-7730 ~ fax 1-800-933-5107
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GT1524 Single Channel Echo Canceller Installation & Operation Manual
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ii © 2002 ClearOne Communications, Inc. All rights reserved. No part of this document may be reproduced in any form or by any means without written permission from ClearOne Communications, Inc. Printed in the United States of America. ClearOne Communications reserves specific privileges. Information in this document is subject to change without notice. GT1524 Installation and Operation Manual ClearOne Part No. 800-114-101 June 2002 (Rev. 2.0) Technical Services Group ~ 1-800-283-5936 (USA) ~ 1-8
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iii GT1524 Installation and Operation Manual Table of Contents CHAPTER 1: Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1 Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1 Professional Services Group . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2 Technical Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2 Sales and Customer Service . . . . . . . . .
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iv APPENDICES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19 Appendix A: Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19 Appendix B: Pinouts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20 Appendix C: Serial Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21 Appendix D: Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
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CHAPTER 1: Introduction The GT1524 provides the highest possible audio quality available in a single channel echo canceller. It features an integrated telephone interface that enables telephone participants of an audio or video conference to sound as if they are actually in the same room. Plus, it features simultaneous two-wire/four-wire operation so you can audio conference and video conference at the same time. And there’s no white noise setup; the GT1524 adapts automatically. The GT1524 perf
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Introduction ~ Professional Services Group 2 Professional Services Group If you need any additional information on how to install, set up, or operate your system, please contact us at one of the locations listed below. We welcome and encourage your comments so we can continue to improve our products and serve your needs. ClearOne Communications ~ 1825 Research Way ~ Salt Lake City, UT 84119 Technical Support Telephone: 1.800.283.5936 (USA) or 1.801.974.3760 Fax: 1.801.977.0087 E-mail: tech.suppo
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Introduction ~ Unpacking 3 Unpacking Ensure that the following items were received with your shipment: ClearOne Communications +12 Telephone +8 +4 GT1524 Enter Esc 0 Meter On Off -4 ✍ is not responsible for -10 -30 product damage incurred GT1524 during shipment. You must make PART 910-114-101 claims directly with the carrier. Inspect your shipment carefully for obvious signs of damage. If the AC Power Cord 12-foot Telephone Cable Push-on Blocks (6) shipment appears damaged, retain PART 699-150
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Introduction ~ Controls and Connections 4 C. LED Meter. The LED bar meter displays the audio level of any input or output of the GT1524 as well as the Echo Return Loss (ERL) and Echo Return Loss Enhancement (ERLE) between the Speaker/Line Out and the Mic/Line audio input channel. The LED meter also displays Telco Echo Return Loss (TERL) and Telco Echo Return Loss Enhancement (TERLE) for the telephone hybrid. D. Meter. This button displays the Meter branch of the GT1524’s LCD menu tree from which
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Introduction ~ Operational Requirements 5 E. RS-232. This female DB-9 serial port is for interconnection between the GT1524 and a PC or custom remote control. See Appendix C for serial port commands. F. Control/Status. This female DB-25 connector is used to interface parallel control and status to the GT1524. Control pins on this connector are used to perform functions via a momentary closure to ground. Each status pin on this connector shows the state of the function handled by the pin. Status
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6 Technical Services Group ~ 1-800-283-5936 (USA) ~ 1-801-974-3760
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CHAPTER 2: Installation Hardware Setup This chapter provides step-by-step instructions for installing your GT1524 system. Figure 2.1 (below) shows the back panel connections of a fully-installed GT1524 system. 5W, 8Ω Speaker Analog Telephone Line 4 WIRE/VIDEO CODEC MIC/LINE IN AUX IN LINE OUT AUX OUT IN OUT Logic out status and Power Amp control Microphone Video codec AP IR Remote Control Figure 2.1. GT1524 installation Connecting the unit The power cord should be connected last. Otherwise, t
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Installation ~ LCD Programming 8 5. Use the RS-232 port to connect the GT1524 to a PC (for use with The three terminals in HyperTerminal), an AP IR Remote Control, or a custom remote control the Phoenix connector ✍ device. correspond with the rear- panel audio contacts (from left to 6. Connect an external amplifier or sound reinforcement system to Line Out. right): + (positive), – (negative), Use Aux Out to connect recording equipment, such as a VCR. Nominal and (ground). output is 0dBu. 7.
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Installation ~ LCD Programming 9 appropriate menu. Then press Enter. To descend a menu level (go deeper into the +12 tree), press Enter. To ascend a menu level (go back toward the top of the tree), +8 +4 Meter press ESC. Enter Esc 0 -4 -10 The Meter button will also access the Meter tree directly. The menu trees are -30 structured in levels, such that the first level (top of the tree) branches into multiple Figure 2.5. Front Panel Buttons subcategories (see Figure 2.7). These branches typically
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Installation ~ LCD Programming 10 Power-Up Screen ClearOne GT1524 Ve rsio n x.x Gain Adjust Mic/Line Input Mute Phantom Power Mic/Line In AGC High Pass Filter Aux In Echo Canceller Inputs NLP 4 Wire In Gain Adjust From Telco Mute AGC Spkr/ Line Out Gain Adjust Aux Out Mute Gain Adjust Mic/Line In Outputs Mute Aux Out Mix Aux In 4 Wire Out To Telco Lock Panel Set Passcode Baud Rate System RS232 Flow Control Telco Auto Answer Unit ID Auto Disconnect Ring Indication Mic/Line Input From Aux 4 Wir
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Installation ~ LCD Programming 11 Inputs There are four main submenus under the Inputs menu tree: Mic/Line In, Aux In, 4 Wire In, and From Telco (see Figure 2.7). Mic/Line In Gain Adjust. This adjusts the Mic/Line In submenus, including the level for the Input gain (ranging between -20dB and 20dB). The default setting is 0dB. Mic/Line Input. This input defaults as a line-level input (0dB gain) but can be switched to a mic level input (55dB or 25dB gain). Mute. This parameter mutes the input ch
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Installation ~ LCD Programming 12 AGC. The input can use automatic gain control (AGC). This feature keeps softer and louder talkers at a consistent transmit level. This feature is disabled when shipped from the factory. The target gain is 0dB and adjusts at 2dB per second. The AGC start adjustment is -20dB, but will adjust only +6dB. Adjustments will not be made at .5dB on either side of the target (0dB). Outputs There are four main submenu under the Outputs menu tree: Speaker/Line Out, Aux Out
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Installation ~ LCD Programming 13 To lock the front panel 1. Enter the System menu 2. Scroll through the menu items to select Lock Panel, and press Enter. 3. Select On, and press Enter again. To unlock the front panel 1. Attempt to adjust a parameter. The GT1524 prompts you for the passcode. 2. Begin entering the passcode. Once you have correctly entered the fifth character, the front panel unlocks. (The default passcode for all units is Up, Up, Down, Down, Enter.) Set Passcode Once you have unl
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Installation ~ LCD Programming 14 Ring Indication. An audible ring indicator, sent to the PA output, can be enabled or disabled under this menu. Unit ID Number The Unit ID # allows you to view the read-only unit address set at the factory. This unique ID number identifies that particular unit and cannot be changed. Meters There are five main submenus under the meter menu tree: Inputs, Outputs, ERL/TERL, ERLE/TERLE, and Default Meter. The first four submenus are all handled in the same way. Inpu
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CHAPTER 3: Operation A correctly installed GT1524 virtually runs by itself. Typical operations involve changing volume of an output, muting an input or output, or handling calls on the connected telephone handset. For most installations, a custom remote control (optional) is also used. Front Panel Control For optimum performance, Controlling volume ✍ adjust all inputs to 0dBu before calibrating outputs. When participating in a conference, you might find it necessary to increase or decrease the
