3. An encoder as defined in claim 1 wherein said coding means comprises, a memory addressable by said input signals and having a plurality of output lines, shift register means, means operable from a starting position for sequentially connecting said output lines from said memory to said shift register, and means responsive to a 1 bit output from said sequential connecting means for returning said connecting means to said starting position.
1. An encoder for coding digital input signals for use in a digital recorder, transmitting, or like system comprising, a source of digital input signals of equal word length to be encoded, and means responsive to equal word length digital input signals from said source for coding those input signals which are within a predetermined signal range, said coding means comprising means for implementing a code comprising a plurality of different length code words, every which code word is of a length which is different from every other code word and each of which code words includes a single 1 bit at one end bit position of the code words, said single one bit being located at the same end of each of said code words.