User manual YAMAHA E3

[. . . ] IMPORTANT: When connecting this product to accessories and/or another product use only high quality shielded cables. Cable/s supplied with this product MUST be used. Failure to follow instructions could void your FCC authorization to use this product in the USA. NOTE: This product has been tested and found to comply with the requirements listed in FCC Regulations, Part 15 for Class "B" digital devices. [. . . ] It is also capable of reducing feedback as well as ambient noise from air conditioning and fans. This technology enables noise-free, highintelligibility teleconferencing in just about any environment. Four AES/EBU input and output channels are provided, all with built-in sample rate conversion capability. The E3 can also connect to digital audio devices that do not allow word clock synchronization. Installation Refer to the DME64N/24N owner's manual for installation details. The screws on the left and right sides of the card also ground (earth) the device, so be sure to tighten them securely. Supplied Items Owner's Manual (this document) 3-pin Euroblock plugs x 4 Cable ties x 4 E3 Owner's Manual 5 Principle of Operation How Acoustic Echo and Noise are Reduced Acoustic echo occurs in a teleconferencing system when the sound from a speaker or reflections from surfaces of the room are picked up by a microphone and transmitted to the other party, resulting in a loss of intelligibility. Projectors and air conditioning systems also produce noise that can interfere with clear teleconferencing. The echo cancelling and noise reduction capabilities of the E3 help to achieve maximum clarity and intelligibility for smooth, effective communication. Remote "Hello" Local "Hello" "How's business?" DME64N/24N SCENE HOME UTILITY LEVEL MUTE CANCEL ENTER "How's business?" + E3 "How's business" + "Hello" + fan noise Fan noise NOTE In order to reduce acoustic echo originating from the remote location, an echo canceller must be installed and active at the remote location. 6 E3 Owner's Manual E3 Signal Flow The local and remote locations in a teleconferencing system are referred to as the "near end" and "far end", respectively. The E3 acoustic echo canceller (AEC) works by comparing the reference signal received from the far-end with the signal from the microphone in order to determine which components of the signal are echo, and then subtracts only the far-end echo component from microphone signal. The near-end sound is thus clearly transmitted to the far end without echo. From Far-end A From Far-end B From Far-end C From Far-end D NR NR NR NR Far-end Voice A Far-end Voice B Far-end Voice C Far-end Voice D Matrix Router To Far-end 4 NR AEC Near-end Mic. 4 FBS Near-end Voice 4 Near-end Mic. · Mix the "To Far-end 1" ­ "To Far-end 4" outputs from the AEC component and connect the mixed output to "To Office X" for transmission to the remote location. HINT When multiple speakers are being used in the local meeting room, be sure to connect the mixed signal to them in parallel. AEC may not function properly if the output balance between the speakers changes. E3 Owner's Manual 19 3 Adjust the DME Designer AEC component editor parameters so that acoustic echo is effectively cancelled from the audio signal sent to Office X. Begin by checking that the connection with Office X is working properly and that conversation is possible. If echo can be heard with the default AEC section Effect setting of "1", try increasing the setting in small increments. Echo cancellation efficiency will increase as the setting is increased, but sound quality will decrease at the same time so it is necessary to find the best setting for conditions in the local meeting room while actually listening to the audio signal. Other parameters can usually be left at their default settings. Refer to the DME Designer owner's manual for details on the individual AEC component parameters. 20 E3 Owner's Manual Example 2: Teleconferencing with Two Remote Locations from Two Meeting Rooms Using one E3 card, multiple participants in two meeting rooms can teleconference with two separate remote locations ("Office X" and "Office Y"). Preparation Referring to Example 1, use an oscillator component to determine the ideal microphone and speaker positions for each meeting room. DME24N x 1 E3 x 1 Microphones x 4 Speakers x 4 Remote Connection and Settings 1 Connect the microphones, speakers, and teleconferencing system to the analog [IN] and [OUT] connectors on the rear panel of the DME24N as shown in the diagram. A total of four microphones can be connected for the medium and small near-end meeting rooms, allowing multiple participants to confer simultaneously in both rooms. E3 Owner's Manual 21 Small Meeting Room (Near End) Microphone 1 Office X (Remote ­ Far End) Speaker 1 Teleconferencing system Speaker 2 Microphone 2 OUT (Analog) Network IN/OUT (Analog) DME24N IN (Analog) + Network IN/OUT (Analog) E3 OUT (Analog) IN (Analog) Microphone 1 Speaker 1 Office Y (Remote ­ Far End) Teleconferencing system Speaker 2 Microphone 2 Medium Meeting Room (Near End) 22 E3 Owner's Manual 2 Make the required virtual connections in the DME Designer configuration window. · Connect the signal from the microphones in the small and medium local meeting rooms (Conf S Mic1/2 and Conf M ­ Mic1/2) and the audio signal from the remote locations (From Office X and From Office Y) to the appropriate inputs of the AEC component. · Mix the "Near-end Voice 1" and "Near-end Voice 2" outputs and the "Far-end Voice A" outputs from the AEC component and connect the mixed output in parallel to the small meeting room speakers (Conf S SP 1 and SP 2). · Mix the "Near-end Voice 3" and "Near-end Voice 4" outputs and the "Far-end Voice B" outputs from the AEC component and connect the mixed output in parallel to the medium meeting room speakers (Conf M SP 1 and SP 2). · Mix the "To Far-end 1" and "To Far-end 2" outputs from the AEC component and connect the mixed output to "To Office X" for transmission to remote Office X. [. . . ] Dato che le specifiche, le apparecchiature o le opzioni possono essere diverse da paese a paese, verificarle con il proprio rappresentante Yamaha. E3 Owner's Manual 185 Memo 186 E3 Owner's Manual Memo E3 Owner's Manual 187 188 E3 Owner's Manual E3 Owner's Manual 189 For details of products, please contact your nearest Yamaha representative or the authorized distributor listed below. Pour plus de détails sur les produits, veuillez-vous adresser à Yamaha ou au distributeur le plus proche de vous figurant dans la liste suivante. Die Einzelheiten zu Produkten sind bei Ihrer unten aufgeführten Niederlassung und bei Yamaha Vertragshändlern in den jeweiligen Bestimmungsländern erhältlich. Para detalles sobre productos, contacte su tienda Yamaha más cercana o el distribuidor autorizado que se lista debajo. Louis Street Msida MSD06 Tel: 02133-2144 THE NETHERLANDS/ BELGIUM/LUXEMBOURG Yamaha Music Europe Branch Benelux Clarissenhof 5-b, 4133 AB Vianen, The Netherlands Tel: 0347-358 040 FRANCE Yamaha Music Europe BP 70-77312 Marne-la-Vallée Cedex 2, France Tel: 01-64-61-4000 ITALY Yamaha Music Europe GmbH, Branch Italy Viale Italia 88, 20020 Lainate (Milano), Italy Tel: 02-935-771 SPAIN/PORTUGAL Yamaha Music Europe GmbH Ibérica, Sucursal en España Ctra. [. . . ]