Title:
ELECTRIC CIRCUIT DEVICE
Document Type and Number:
Japanese Patent JPS55146053
Kind Code:
A
Abstract:
A circuit is disclosed which is responsive to an input signal for producing an output signal dependent on its root mean square. The circuit comprises a multiplying circuit for producing a squared signal proportional to the square of the input signal, an averaging circuit responsive to the squared signal to produce an average signal proportional to the mean of the squared signal, and a square root circuit for taking the square root of the average signal. At periodic or aperiodic instants, switches disconnect the input signal and maintain it disconnected each time for a predetermined time duration. A feedback circuit operates during each such duration to produce a feedback signal which exactly offsets any output still produced by the multiplying circuit during that duration due to noise or drift. Any such feedback signal is stored between the predetermined durations and applied as a correcting signal to the output of the multiplying circuit. Also disclosed is one particular form which the multiplying circuit can take.
Inventors:
DERETSUKU FUREIZAA PATSUPUWAAS
Application Number:
JP15931379A
Publication Date:
November 14, 1980
Filing Date:
December 10, 1979
Export Citation:
Assignee:
RAKARU DANA INSUTORUMENTSU LTD
International Classes:
G01R19/02; G06G7/163; G06G7/20; G06G7/25; (IPC1-7): G01R19/02; G06G7/20