User manual YAMAHA MY4-AEC

[. . . ] Owner's Manual Bedienungsanleitung Mode d'emploi Manual de instrucciones Manuale di istruzioni EN DE FR ES IT RU ZH JA ITALIANO ESPAÑOL MY4 - AEC FRANÇAIS ACOUSTIC ECHO CANCELLER CARD DEUTSCH ENGLISH FCC INFORMATION (U. S. A. ) 1. IMPORTANT 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 approved by Yamaha may void your authority, granted by the FCC, to use the product. [. . . ] Operational details are provided in the DME Designer owner's manual. Built-in sample rate conversion is provided for all inputs and outputs (sample rate conversion settings are also made via the DME Designer software). Use the supplied Euroblock plugs for connection (refer to "Euroblock Connection" on page 10). NOTE The channel 3 and channel 4 inputs and outputs ([IN3/4] and [OUT3/4] in the above illustration) cannot be used when the DME64N/24N word clock sampling rate is set to 88. 2 kHz or 96 kHz. 8 MY4-AEC Owner's Manual DME Processing DME64N/24N AEC Processing MY4-AEC SRC Analog Out Mic In AES/EBU [OUT1/2][OUT3/4] SRC AES/EBU [IN1/2][IN3/4] MY4-AEC Owner's Manual 9 Euroblock Connection Please be sure to use the supplied Euroblock plugs to connect the AES/EBU [IN] and [OUT] connectors. Cable preparation · To prepare the cable for attachment to a Euroblock approx. 7 mm connector, strip the wire as shown in the illustration using stranded wire to make connections. With a Euroblock connection, stranded wires may be prone to breakage because of metal fatigue due to the weight of the cable or due to vibration. Bundle the cables and the Euroblock tabs using the supplied cable ties (page 12). When rackmounting your equipment, use a lacing bar when possible to bundle and fasten the cables. NOTE Do not tin (plate with solder) the exposed end. · If cables will be frequently connected and disconnected, as in the case of a portable installation, we recommend that you use ferrules with insulation sleeves. Use a ferrule whose conductor portion has an external diameter of 1. 6 mm or less, and a length of approximately 7 mm (such as the AI0, 5-6WH made by the Phoenix Contact corporation). 1. 6 mm or less approx. 7 mm 10 MY4-AEC Owner's Manual 1 Loosen terminal screws. 2 Insert cables. Loosen. 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 high. MY4-AEC Owner's Manual 15 5 Open the Oscillator component editor, set the Wave Form type to "Pink, " and engage the Output section "On" button. Go back to the AEC component editor and, while watching the "Ref. In" meter, adjust the oscillator output level so that the yellow segment lights only occasionally. 16 MY4-AEC Owner's Manual 6 Check that the ERL (Echo Return Loss) meter in the AEC component is moving. If this meter is moving over a wide range it means that a large portion of the pink noise being output from the speaker is being picked up by the corresponding microphone, and therefore a large amount of echo will be transmitted to the remote location. Carefully adjust the positions and pickup directions of the four microphones in relation to the speakers in order to reduce this echo level as much as possible. The more you can reduce the echo at this stage, the more effective the AEC will be. NOTE · If the local meeting room is very reflective or reverberant, it may be difficult to reduce the echo level sufficiently by simply repositioning the microphones and speakers. In such cases it may be necessary to apply acoustic panels to the walls or use other means to reduce room reflections. · If only the green segment of the ERL meter lights, setting the "Effect" parameter to 1 or 2 should be optimum, but if the yellow segment of the ERL meter lights an "Effect" setting of 3 or 4 will be required to produce the best results. Since the actual effectiveness of the processing will depend on the rooms in which it is used it is important make adjustments while actually connected to and conferring with the remote location. · If the input signal becomes distorted for any reason before it reaches the Near-end Mic. 1 ­ 4 inputs of the AEC component, echo cancelling will not function properly. 7 Enter the microphone-to-speaker distance in meters into the Acoustic Echo Canceller section "Distance" field. If multiple speakers are used, enter the distance between the microphone and nearest speaker for each channel. [. . . ] 17, 200, 28230 Las Rozas (Madrid), Spain Tel: +34-902-39-8888 GREECE Philippos Nakas S. A. The Music House 147 Skiathou Street, 112-55 Athens, Greece Tel: 01-228 2160 SWEDEN/FINLAND/ICELAND Yamaha Music Europe GmbH Germany filial Scandinavia J. Wettergrens Gata 1, Box 30053 S-400 43 Göteborg, Sweden Tel: 031 89 34 00 NORTH AMERICA CANADA Yamaha Canada Music Ltd. 135 Milner Avenue, Scarborough, Ontario, M1S 3R1, Canada Tel: 416-298-1311 U. S. A. [. . . ]