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High Speed and SMUX modes
• Sampling frequencies up to 48kHz are designated as being in the “NFS range” (from NFs, Normal Frequency sampling).
• Sampling frequencies above 48kHz and up to 96kHz are in the “DFS range” (from DFs, Double Frequency sampling).
• Sampling frequencies above 96kHz and up to 192kHz are in the “QFS range” (from QFs, Quadruple Frequency
sampling).
At high sample rates (in the DFS and QFS ranges), the MADI interface can operate in either of two modes; High Speed or SMUX:
DFS range (88.2kHz to 96kHz)
The MADI interface can operate in High Speed or SMUX2 modes. In High Speed mode the MADI-embedded reference signal
has a frequency of 88.2kHz to 96kHz. In SMUX2 mode, the frequency is 44.1kHz to 48kHz.
QFS range (176.4kHz to 192kHz)
The MADI interface can operate in High Speed or SMUX4 modes. In High Speed mode, the MADI-embedded reference
signal has a frequency of 176.4kHz to 192kHz. In SMUX4 mode, the frequency is 44.1kHz to 48kHz.
NOTE: To understand this topic fully, it is important to read the AES MADI specification – AES 10 –2003 (www.aes.org
).
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5. Sample Rates and I/O Mapping