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The low level signal Transmission can be improved against the noise.
*16 bits = 15 bits for signal + 1 bit for frequency calibration data
Depth and temperature data from the SEN board are read by the CPU through the AD
converter on the CONT B board and then stored in the scratch pad RAM U2.
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Signal Transmission
The temperature, upward and downward sounding and depth signals stored in the RAM
are read out one after another according to the transmission format shown in Fig. 2.13.
Those are D/A converted, frequency-modulated on the CONT B board and transmitted to
the paravane receiver. Synchronous signals ("DOWN SYNC" and "UP SYNC") are made by
software, stored in the ROM and read out at each transmitting timing.
The timers on the CONT A board operate as a frequency counter. It counts the Voltage to
Frequency (V/F) converter output during the temperature data period and adjusts the
signal level if V/P converter characteristic deviates from the rated range.
Fig. 2.12
Fig. 2.13
2-8
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