Yamaha MY4AEC 4-Channel Echo Cancellation Card (for Yamaha DME-N)


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  • The MY4-AEC card provides 4 channels of acoustic echo cancellation for remote conferencing using Yamaha's DME24N and DME64N digital mixing engines. As well as the echo cancellation function, the MY4-AEC card also offers a noise reduction function which removes steady-state background noise such as air conditioning and projector fans etc. The card also has a feedback suppressor with 42 notch filters per channel to aid the suppression of feedback in PA systems. Any of the 8 internal mic/line inputs of the DME24N can be routed to the MY4-AEC. In the case of the DME64N, any of the MY card slots or CASCADE bus can route to the MY4-AEC. The AES/EBU inputs and outputs (with sample rate conversion) can route to either the MY4-AEC or be used independently in a DME design.


    • 4ch Acoustic Echo Canceller
    • Maximum echo time delay (Tail length) 400ms
    • High definition sound (frequency range 20Hz-20kHz)
    • 4ch far-end input for multipoint meeting
    • 4ch Noise Reduction
    • 4ch Feedback Suppressor
    • Additional 4ch AES/EBU I/O with SRC

    The MY4-AEC has 4 channels of adaptive echo cancelling which can automatically find the appropriate setting of AEC according to the environment and the equipment being used. It can be used for multi-location meetings and in large conference rooms. Thanks to its very long 'tail length' (delay time), the MY4-AEC can remove very long delays (max 400ms) and can provide clear sound even when used in very large rooms or for long distance conferencing. As DME units are easily connected into PA systems, it also makes a noticeable difference in very large rooms where sound reinforcement is required and remote participants are involved.

    Web-based remote conferencing is becoming more popular and the sound quality is better than former systems utilizing telephone lines. The MY4-AEC can support a wide frequency range (20-20kHz) ensuring a natural sound for conversation.
    The sampling rate of the MY4-AEC is 48kHz but it can be used in 96kHz systems by reducing capacity from 4 to 2 channels.

    In large conference rooms or auditoriums where microphones are used with a PA for voice amplification, the MY4-AEC's 4-ch feedback suppressor employs 42 notch filter bands per channel. Each channel also has Width and Depth parameters that can be adjusted to achieve optimum level.
    The MY4-AEC is also equipped with a powerful noise reduction function. Any constant, disturbing fan or air conditioning noise can be attenuated, further maximizing the performance of the echo canceller.

    To facilitate the use of other digital equipment, the MY4-AEC card has 4ch AES/EBU I/O. The I/O ports have sampling rate converters ensuring easy connection to equipment with different sampling rates.

    With DME Designer it is possible to optimize the performance of all the Acoustic Echo Canceller parameters (DME Designer V4.0 and compatible hardware required).

  • Compatible Hosts DME24N, DME64N V4.0 or later software is required
    Sampling Frequency 44.1kHz, 48kHz, 88.2kHz, 96kHz (-10%, +6%)
    Signal Processing Adaptive Echo Canceller, Feedback Suppressor
    Noise Reduction, Matrix Mixer
    Frequency Range 20Hz to 20kHz
    Arrival Time of Direct Sound 120ms maximum
    Echo Time Delay 400ms maximum
    Echo Cancelling Capacity 60dB maximum
    Noise Reduction 17dB maximum
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