A note on error detection codes for asymmetric channels

Some new codes are described which are separable and are perfect error detection codes in a completely asymmetric channel. Some results are given of comparisons between one simple form of the code in which the check bits correspond to the sum of ones in the information bits and the four out of eight code. The new code is found to compare favorably in error detection capability in several cases. In addition, some more complex codes of this type are indicated