Yamaha MY4-AEC manual

ACOUSTIC ECHO CANCELLER CARD MY 4 - AEC Owner’s Manual Bedienungsanleitung Mode d’emploi Manual de instrucciones Manuale di istruzioni Руководство пользователя 取扱説明書 JA ZH RU IT ES FR DE EN ENGLISH DEUTSCH FRANÇAIS ESPAÑOL ITALIANO 中文 日本語 MY 4 - AEC ACOUSTIC ECHO CANCELLER CARD[...]

FCC INFORMA TION (U .S.A.) 1. IMPORT ANT NOTICE: DO NOT MODIFY THIS UNIT! This product, when installed as indicated in the instructions contained in this manual, meets FCC requirements. Modifications not expressly a pproved by Y amaha may void your authority , granted by the FCC, to use the product. 2. IMPORT ANT : When connecting this product to a[...]

MY4-AEC Owner’s Manual 3 PRECAUTIONS PLEASE READ CAREFULL Y BEFORE PROCEEDING * Please k eep this manual in a saf e place for future refere nc e . WA RN I N G Always follow the basic precautions listed below to avoid the possibility of serious injury or even death from electrical shock, short-circuiting, damages, fire or other hazards. These prec[...]

4 MY4-AEC Owner’s Manual Info rmation f or Users on Collection and Disp osal of Old Equipment This symbol on the products, pac kaging, and/or accompany ing documents means that used electrical and electronic products should not be mix ed with general household waste . For pr oper treatment, recov er y and recycling of old pr oducts, please take t[...]

MY4-AEC Owner’s Manual 5 Intr oduction Thank you for choosing the Y amaha MY4-AEC. The MY4-AEC is an acoustic echo canc eller card designed for use with the DME64N/24N Digit al Mixing Engines that can effect ively reduce troublesome acou stic echoes due to secondary pick up of speaker output and reflect ions from room surfaces in tel econferencin[...]

6 MY4-AEC Owner’s Manual P rinciple of Oper ation How A coustic Echo an d Noise are R educed Acoustic echo occurs in a teleconfer encing syst em when the sound from a speaker or refl ections from surfaces of th e room ar e pick ed up by a microphone and tr ansmitted to the other party , resulting in a loss of intelligibi lity . Projectors and air[...]

MY4-AEC Owner’s Manual 7 MY4-AEC Signal Flow The local and remote locations in a te leconferenc ing system ar e referred to as the “near end” and “far end”, respectively . The MY4-AEC a coustic echo canceller (AEC) works by comparing the refer ence signal received fr om the far -end with the signal from the micr ophone in order to determi[...]

8 MY4-AEC Owner’s Manual The Connect ors and Their F u nctions AES/EBU IN and OUT Connectors These connectors support four channels of AES/EBU format digital audio input and output to and from the host DME64N/2 4N unit, but those si gnals are not dir ectly routed via the MY4-AEC processing section. Signals f rom the host’ s analog or digital in[...]

MY4-AEC Owner’s Manual 9 DME Processing DME64N/24N MY4-AEC AEC Processing SRC SRC AES/EBU [OUT1/2][OUT3/4] AES/EBU [IN1/2][IN3/4] Analog Out Mic In[...]

10 MY4-AEC Owner’s Manual Eur oblock Connec tion Please be sure to use the supplied Eur oblock plugs to connect the AES/EBU [IN] and [OUT] connectors. Cable prepar ation • T o prepar e the cable for attachment to a Eur oblock connector , strip the wir e as shown in the illustration using stranded wir e to make connections. W ith a Euroblock con[...]

MY4-AEC Owner’s Manual 11 1 Loosen terminal scre ws. NOTE A slotted screwdriver with a blade width of about 3 millimeters is recommended. 2 Insert cables. 3 Se cu rely ti gh ten te rmi na l scr ews. Pull the cables (not t oo strongly) to confirm that they are secur ely connected. Loosen. Slotted Screwdriver Te r m i n a l Screw Euroblock Plug Ta [...]

12 MY4-AEC Owner’s Manual 4 Bundle the cables and the Eurobloc k tab using t he supplied cable tie . NOTE T rim any excess part of the cable tie as necessary . 5 Inser t the Euroblock plug into the AES/EBU [IN] or [OUT] connector of the MY4-AEC.[...]

MY4-AEC Owner’s Manual 13 Basic Connection and Set up This is an example of a teleconfere ncing system set up to allow multiple participants to hold conferen ces with a remote location (“Of fice X”). The first step is to make the basic local (near end) conne ctions and determine the optimum microphone an d speaker locations as well as gain se[...]

14 MY4-AEC Owner’s Manual 3 Make the requir ed vir tual connections in the DME Designer configuration win dow. • Connect the signals from micropho ne inputs 1 – 4 to th e “Near -end Mic. 1” – “Near -end Mic. 4” inputs on the AEC component. • Place an oscillator that will be used for AEC adjustment in the configuratio n window and [...]

MY4-AEC Owner’s Manual 15 4 Speak into the microphones as y ou would during an actual conference and adjust the input ga in of each channel. Adjust the DME24N HA Gain while watching the “Mic. In” meters in the AEC component editor so that the yellow segment lights only occasionally . NOTE AEC may not function properly if the gain is set too h[...]

16 MY4-AEC Owner’s Manual 5 Open the Oscillator component editor , set the Wa ve F orm type to “Pink, ” and engage the Output sec tion “On” but ton. Go back to the AEC component editor and, while watching the “Ref. In” meter , adjust the oscillator output level so that t he yellow segment lights only occasionally .[...]

MY4-AEC Owner’s Manual 17 6 Check that the ERL (Echo Ret urn Loss) meter in the AEC component is moving. If this meter is moving ov er a wide range it means that a large portion of t he pink noise being output from the speaker is being picked up by the corre sponding microphone, and therefo re a large amount of echo will be transmitted to the r e[...]

18 MY4-AEC Owner’s Manual 1 Connect the microphones, speakers, and teleconferencing s ystem to the analog [IN] and [OUT] connectors on the rear panel of the DME24N as shown in the diagram. Four microphones can be conn ected at the near -end location, allowing multiple conferenc e participants. Remot e Connection and Set tings Meeting Room (Near E[...]

MY4-AEC Owner’s Manual 19 2 Make the requir ed vir tual connections in the DME Designer configuration win dow. • Connect the signal from th e four local mi crophones (Mic1 – Mic4) and the audio signal from the r emote location (From Of fice X) to the appropr iate inputs of the AEC component. • Mix the “Near -end V oice 1” – “Near -e[...]

20 MY4-AEC Owner’s Manual 3 Adjust the DME Designer AEC component editor par ameters so that acoustic echo is ef fectivel y cancelled from the audio signal sent to Of fice X. Begin by checking that the connec tion with Office X is working pr operly and that conversation is possible. If echo can be hear d with the default AEC section Effect settin[...]

MY4-AEC Owner’s Manual 21 Using one MY4-AEC card, multiple participants in two meeting r ooms can teleconference with two separate remote locat ions (“Office X” and “Office Y”). Referrin g to Example 1, use an oscillator component to determine the ideal microphone and speaker positions for each meeting r oom. The following equipment is us[...]

22 MY4-AEC Owner’s Manual Network Network Office X (Remote – Far End) Office Y (Remote – Far End) Teleconferen cing system Teleconferen cing system OUT (Analog) IN/OUT (Analog) Small Mee ting Room (Near End) Microphone 1 Speaker 1 Speaker 2 IN (Analog) Microphone 2 Medium Meeting Room (Near End) DME24N MY4-AEC + Microphone 1 Microphone 2 Spea[...]

MY4-AEC Owner’s Manual 23 2 Make the requir ed vir tual connections in the DME Designer configuration win dow. • Connect the sign al from the micr ophones in the small and medium local meeting roo ms (Conf S Mic1/2 and Conf M – Mic1/2) and the audio signal fr om the remote locations (From Of fice X and From Offi ce Y) to the appropriate i npu[...]

24 MY4-AEC Owner’s Manual 3 In the Matrix Rout er section of the AEC c omponent editor , select one or more of the “F rom Far-end A – D signals” to be used as the ref erence for each AEC channel 1 – 4. The “On” buttons in the Matrix Rout er sect ion can be used to select microphones and locations for each meeting r oom. For this examp[...]

MY4-AEC Owner’s Manual 183 Appendix Specifications  GENERAL SPECIFIC A TIONS  DIGIT AL INPUT/OUTPUT C HARA C TERISTICS Sampling Frequency 44.1kHz-10% to 48kHz+6%, 88.2kHz-10% to 96kHz+6% Power requir ements 5V : 395mA 3.3V : 295mA T emperature Range Operating 0 to +40°C Storage -20 to +60°C Weight 160g Te r m i n a l Fo rm a t Audio Data [...]

184 MY4-AEC Owner’s Manual Dimensions 164.1 ( 12 ) 176.1 40 120 unit: mm[...]

MY4-AEC Owner’s Manual 185 * Specifications and de scriptions in this owner ’s manual are for inf or mation pur poses only . Y amah a Corp. reserves the right to change or modify pro ducts or specific ations at any time w ithout prior notice. Since specif ications, equipme nt or options ma y not be the same in e very locale, p lease check w ith[...]

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190 MY4-AEC Owner’s Manual CAN ADA Y amaha Canada Music Ltd. 135 Milner Avenue, Scarborough, Ontario, M1S 3R1, Canada T el: 41 6-298-1311 U.S . A. Y amaha Corpora tion of America 6600 Orangethorpe Ave., Buena Park, Calif. 90620, U.S.A. T el: 71 4-522-9011 MEXICO Y amaha de México S.A. de C.V . Calz. Javier Roj o Gómez #1149 , Col. Guadalupe del[...]

MY4-AEC Owner’s Manual 191 DENMARK Y amaha Music Europe GmbH, T yskland – filial Denmark Generatorvej 6A, DK-27 30 Herlev , Denmark T el: 44 92 49 00 NORW A Y Y amaha Music Europe GmbH Germany - Norwegian Branch Grini Næringspark 1, N-134 5 Østerås, Norway T el: 67 16 77 70 RUS SIA Y amaha Music (Russia) Room 37, bld. 7, K ievskaya street, M[...]

C.S.G., Pro Audio Division © 2011 Y amaha Corporation 109MWTO-A0 Printed in Japan WW75420 Y amaha Pro A udio global web site http://www .yamahaproaudio.com/ Y amaha Manual Library http://www .yamaha.co.jp/manual/[...]