PURPOSE:To miniaturize the circuit by constituting a ROM of two stages, controlling the ROM of a post-stage by the ROM of a pre-stage, and switching an address of the ROM of a second stage by a multiplexer. CONSTITUTION:A control code for designating in advance a telemetry data editing port subjected to addressing by a part of output data of a first ROM 8, an address signal inputted from a multiplexer 7, and a part of a frame address inputted from an address bus 11 is stored in a second ROM 9. From a prescribed telemetry editing port designated by a second ROM 9, a timing signal is generated. By constituting the ROM of two stages, it will suffice that only the minimum necessary address information is stored in the ROM 9, and the redundancy can be eliminated. Also, by inserting the multiplexer 7 of the address between the ROM 8 and the ROM 9, compressibility of telemetry data can be set to variable length. In such a way, the number of pieces of ROMs to be used can be curtailed remarkably.
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