Here’s the patent, since I couldn’t find any other detailed documentation. It describes two separate implementations:
Digital, storing log(x) as a fixed-point number and performing ordinary digital arithmetic on it.
Analogue, storing x as floating-point with digital sign and exponent but analogue mantissa. It then describes some mixed analogue/digital circuits to perform the requisite arithmetic.
The slides linked in the OP are about the digital one, and only once mention the possibility of analogue as an intuition pump. I don’t know which one the quoted performance numbers are for.
Here’s the patent, since I couldn’t find any other detailed documentation. It describes two separate implementations:
Digital, storing log(x) as a fixed-point number and performing ordinary digital arithmetic on it.
Analogue, storing x as floating-point with digital sign and exponent but analogue mantissa. It then describes some mixed analogue/digital circuits to perform the requisite arithmetic.
The slides linked in the OP are about the digital one, and only once mention the possibility of analogue as an intuition pump. I don’t know which one the quoted performance numbers are for.