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European models Purchaser/User Information specified in EN55103-1 and EN55103-2. Conforms to Environments: E1, E2, E3 and E4 4 MY4-AEC Owner’s Manual Introduction Introduction 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 MY4-AEC Owner’s Manual 5 Principle of Operation Principle of Operation 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 MY4-AEC help to achieve maximum clarity and intelligibility for smooth, effective communication. Remote Local HOME UTILITYSCENE LEVEL MUTE ENTERCANCEL “Hello” “Hello” “How’s business?” Fan noise “How’s business” + “Hello” + fan noise “How’s business?” DME64N/24N MY4-AEC + 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 MY4-AEC Owner’s Manual MY4-AEC Signal Flow MY4-AEC Signal Flow From Far-end A From Far-end B From Far-end C From Far-end D To Far-end 1 NR NR NR NR To Far-end 4 NR FBS To Far-end 3 Near-end Mic. 3 Near-end Voice 3 NR FBS To Far-end 2 Near-end Mic. 2 Near-end Voice 2 NR FBS Near-end Mic. 1 Near-end Voice 1 NR FBS AEC AEC AEC AEC Matrix Router Far-end Voice A Far-end Voice B Far-end Voice C Far-end Voice D Near-end Mic. 4 Near-end Voice 4 Reference signal FBS: Feedback suppressor NR: Noise reduction MY4-AEC Owner’s Manual 7 The Connectors and Their Functions The Connectors and Their Functions 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/24N unit, but those signals are not directly routed via the MY4-AEC processing section. Signals from the host’s analog or digital inputs must be routed to the MY4AEC card’s AEC processing section via the host’s processing section in order to apply echo cancellation, as shown in the illustration below. 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 MY4-AEC AEC Processing SRC SRC AES/EBU [OUT1/2][OUT3/4] AES/EBU [IN1/2][IN3/4] Analog Out Mic In 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 Euroblock Connection Euroblock Connection Cable preparation • To prepare the cable for attachment to a Euroblock approx. connector, strip the wire as shown in the illustration 7 mm 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 1.6 mm or less disconnected, as in the case of a portable installation, approx. we recommend that you use ferrules with insulation 7 mm 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). 10 MY4-AEC Owner’s Manual Terminal Screw Euroblock Plug Tab Terminal Screw Euroblock Plug Tab Loosen terminal screws. 2 Insert cables. Loosen. Slotted Screwdriver + – G NOTE A slotted screwdriver with a blade width of about 3 millimeters is recommended. 3mm or less 3 Securely tighten terminal screws. Pull the cables (not too strongly) to confirm that they are securely connected. MY4-AEC Owner’s Manual 11 4 4 5 Insert the Euroblock plug into Euroblock tab using the the AES/EBU [IN] or [OUT] supplied cable tie. connector of the MY4-AEC. NOTE Trim any excess part of the cable tie as necessary. 12 MY4-AEC Owner’s Manual Basic Connection and Setup Basic Connection and Setup This is an example of a teleconferencing system set up to allow multiple participants to hold conferences with a remote location (“Office X”). Preparation The first step is ...
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