A variable-length code decoding device includes a serial-to-parallel converter for converting serial data into parallel data for every N bits where N is an integer. The serial data includes consecutive data pieces having variable data lengths. A buffer stores the parallel data which is sequentially read out therefrom for every 2 N bits and which is shifted by N bits in a high-order-bit direction in response to a carry signal. A register stores a shifted number "j" which is read out therefrom in response to a clock signal. The shifted number "j" indicates the number of bits to be shifted. A barrel shifter receives the parallel data from the buffer memory and shifts, by the shifted number "j", the parallel data in the high-order-bit direction so that N-bit parallel data having a starting bit which corresponds to an (j+1)th bit of the parallel data from a most significant bit thereof is output from the barrel shifter. A shifted number/carry signal generator generates, on the basis of a code length of effective data contained in the N-bit parallel data and the shifted number stored in the register, an updated shifted number and the carry signal. The shifted number stored in the register is updated by the updated shifted number.

Variable-length code decoding device

PROBLEM TO BE SOLVED: To provide a section insulator improved in a shape thereof so as to easily know the progression of abrasion with measurement by means of an inspection car, and to provide an abrasion judgment method of the section insulator.SOLUTION: An insulation body 10 of a section insulator is formed such that, in the vertical cross-section in a front-back direction, a width and/or a shape of a sliding surface is changed in accordance with an abrasion of the sliding surface of the insulation body 10. Because the width or the shape is changed when the sliding surface of the insulator 10 is abraded, the progression of the abrasion can be informed by measuring the width or the shape by means of an inspection car. When the measured width and the shape reach an abrasion limit, it is informed of that the width and the shape reach the abrasion limit and an insulation member can be quickly replaced.

Section insulator, and abrasion judgement method of the same

PURPOSE:To decode a final runlength code, by prohibiting a readout clock when an effective signal is read from a buffer memory by the readout clock. CONSTITUTION:The effective signal representing an effective part is generated from variable length code data by which no final runlength code is transmitted by an effective signal generation circuit 108, and it is written on the buffer memory 109. A gate 111 prohibits the readout clock when the effective signal is read from the memory 109 by the readout clock generated at a variable length code decoder circuit 110, and performs a rotation circuit processing on all zero data. The all zero code of a variable length code is formed in the runlength code, and outputs zero to the last as decoding data, then, the final runlength code can be decoded.

Runlength code receiver

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Runlength code receiver