The Sign/Logarithm Number System
Earl E. Swartzlander, Argyrios Alexopoulos · IEEE Transactions on Computers · 1975
A signed logarithmic number system, which is capable of representing negative as well as positive numbers is described. A number is represented in the sign/logarithm number system by a sign bit and the logarithm of the absolute value of the number (scaled to avoid negative logarithms).