Construction of Complete Combinatorial Keyboard Circuit
WU Zhi-quan · Journal of Southwest Jiaotong University · 2004
A new method for constructing keyboard circuit, namely, completely combinatorial keyboard circuit, was proposed. The new key board is composed of n bidirectional interfaces based on the principle of permutation and combination. It allows the maximum number of 2~n-1+n(2~(n-1)-1) keys to be implemented on the n bidirectional interfaces, much larger than the conventional matrix key board. Its components can also be utilized to construct key board circuits according to practical requirement.