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Yamaha launches acoustic echo canceller card

Jun. 14, 2011

Thanks to its flexible DSP processing and IO capability the Yamaha DME series of mixing engines has a great reputation in a wide range of markets such as theatres, broadcasting, commercial installations and live events. Now the company is further extending the DME's potential by introducing the remarkable MY4-AEC Echo Canceller card, which offers high definition sound and flexibility to the audio and video conferencing markets.

Nowadays many companies are utilizing remote conferencing systems to reduce travel costs and to aid the implementation of environmentally friendly policies. With the introduction of HD video in this area, Yamaha's DME systems are becoming increasingly popular as a means of proportionally improving the quality of conferencing audio, and echo cancelling is an important addition to the range of available features.

Some web and TV conferencing systems already have an echo cancellation function to attempt to negate the echo that arises when the sound from a loudspeaker is picked up by a microphone in the same room. However, many users remain dissatisfied with the resultant sound quality.

As DME systems are so popular in installations such as conference halls and meeting rooms, where complex, high-quality processing and routing is required, Yamaha have received many requests for a dedicated processor to deal with the difficult problem of echo cancellation. These requests have been addressed with the introduction of the MY4-AEC.

Kaz Kobayashi, Division Manager of Yamaha Pro Audio comments, "The demand for an echo canceller for the DME series grew in parallel with the remote conferencing market. I'm very pleased to be able to offer this new solution to our DME customers to increase the quality of total systems."

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).

Yamaha Pro Audio is known around the globe as a provider of innovative, top-quality solutions for the sound industry. The Yamaha lineup includes a number of world-standard mixing consoles, signal processors incorporating industry-leading DSP technology, power amplifiers based on energy-efficient drive technology, and an extensive range of speakers suitable for everything from live sound to commercial installations.


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