Patent Number: 7,272,585

Title: Operation circuit and operation control method thereof

Abstract: A product-sum operation circuit includes a pulse width/digital conversion circuit (9) which converts a pulse signal having a pulse width representing an operand value into a digital signal, a sorting circuit (4) which outputs, in descending or ascending order of magnitude, a plurality of operand values Xi converted into digital signals by the pulse width/digital conversion circuit (9), and an accumulated sum circuit (1) which multiplies each operand value output from the sorting circuit (4) by a corresponding operand value Wi and calculates the accumulated sum of multiplication results. The pulse width/digital conversion circuit (9) includes a counter (10) which counts a clock and outputs a count value as a digital signal, and n trailing edge latch circuits (11-0-11-(n-1)) each of which latches a common count value output from the counter at the trailing edge of the input pulse signal.

Inventors: Nomura; Osamu (Fukuoka, JP), Morie; Takashi (Hiroshima, JP), Nakano; Teppei (Fukuoka, JP)

Assignee: Canon Kabushiki Kaisha

International Classification: G06N 3/00 (20060101); G06J 1/00 (20060101); G06N 3/02 (20060101)

Expiration Date: 2019-09-18 0:00:00