Mitsubishi Electric M4853 Maintenance Manual page 33

8.1.3 MMFM Encoding
MMFM (Modified-Modified Frequency Modulation) is also a
"double
reduces the number of clock bits used to fill the empty
spaces between data pulses.
It is not a standard encoding technique, and should
probably be avoided for that reason.
for a description of MMFM.
in the middle of the data cells, but a clock pulse is
encoded only if no clock or data pulses were written in
the previous bit cell, and no data bit is to be written
in the present one.
density" encoding
Figure 8-6 MMFM Read Timing
method, but it
See Figure 8-3
The data bits are written
further