Digital word generator

A digital word generator for automatically generating periodically appearing continuous characters from n-bit words of all word sizes and permutations thereof, comprising:

• a read-only memory from which during a test signal cycle of all possible 2.sup.n word sizes and permutations thereof of a n-bit word only n-bit words of an essentially smaller number z are successively read out and the remaining permutations in accordance with the relation (2.sup.n -z) are obtained by adding to the periodic part a framing bit sequence which determines said test signal cycle and has a length which does not have a common divisor with n so that in n test signal cycles successively all n possible cyclic permutations of binary digits of words provided in said read-only memory are generated, a switch and a binary counter connected so that each n-bit word read out from said read-only memory during one test signal cycle is controlled via said switch and said binary counter and repeated until a set number of repetitions is obtained.

A digital word generator for automatically generating periodically appearing continuous characters from n-bit words of all word sizes and permutations thereof, comprising:

• a read-only memory from which during a test signal cycle of all possible 2.sup.n word sizes and permutations thereof of a n-bit word only n-bit words of an essentially smaller number z are successively read out and the remaining permutations in accordance with the relation (2.sup.n -z) are obtained by adding to the periodic part a framing bit sequence which determines said test signal cycle and has a length which does not have a common divisor with n so that in n test signal cycles successively all n possible cyclic permutations of binary digits of words provided in said read-only memory are generated, one such word generator being incorporated each in a respective send-side and a respective receiver-side portion of a bit error measuring device including a changeover switch and a r-stage generator providing a pseudorandom binary sequence of a length in accordance with the relation 2.sup.r -1, said framing bit sequence determining said test signal cycle and the character synchronism being represented by said pseudorandom binary sequence in which said sequence of n-bit words as generated by said word generator is interleaved in a predetermined pattern position via said changeover switch.

A digital word generator for automatically generating periodically appearing continuous characters from n-bit words of all word sizes and permutations thereof, comprising:

• a read-only memory from which during a test signal cycle of all possible 2.sup.n word sizes and permutations thereof of a n-bit word only n-bit words of an essentially smaller number z are successively read out and the remaining permutations in accordance with the relation (2.sup.n -z) are obtained by adding to the periodic part a framing bit sequence which determines said test signal cycle and has a length which does not have a common divisor with n so that in n test signal cycles successively all n possible cyclic permutations of binary digits of words provided in said read-only memory are generated, and a second read-only memory, said send-side and receiver-side read-only memories being set with a word length n of n-bit words for all values of n=9 to 16 bit which range covers also the word lengths n=1 to 8 bit so that all continuous sequences generated with word lengths n=1 to 16 bit are transmittable.