This is a user manual for MY4-AEC Acoustic Echo Canceller Card. It mainly introduces the functions and usage methods of the card.
The Yamaha MY4-AEC is an acoustic echo canceller card specifically designed for the DME64N and DME24N digital mixers. It is intended to reduce annoying echoes caused by speaker output and room reflections, as well as feedback and environmental noise such as air conditioning and fans, ensuring clear remote video conference calls. The card features four AES/EBU input and output channels, each equipped with internal sample rate conversion capabilities, and can connect to digital audio devices that are not clock-synchronized.
The document details the safety precautions required before installation, including proper grounding and handling of static electricity to prevent damage. It explains the working principle of the echo canceller, which compares a reference signal from the far-end with the microphone signal to identify and remove echo components. The manual also covers the interface functions, noting that the AES/EBU signals are routed directly between the host and the card without processing, while the echo cancellation processing occurs within the card's internal logic. A limitation is noted regarding the use of channels 3 and 4 when the word clock sample rate is set to 88.2 kHz or 96 kHz.