Title:
NOISE CONTROLLER FOR VEHICLE
Document Type and Number:
Japanese Patent JP3392149
Kind Code:
B2
Abstract:
PURPOSE: To speedily generate a reference signal required to control an engine noise by generating a sine wave signal according to an ignition pulse signal and a triangular wave signal generated from the ignition pulse signal.
CONSTITUTION: The output signal of the ignition pulse detector 4 of a reference signal output device 3 is passed through a waveform shaper 5 and integrated by an integrator 6 to generate the triangular wave signal, which is digitized and inputted to a reference signal generator 8. The mean effective value of the triangular wave signal is calculated by the rectifier 9 and smoothing circuit 10 of the reference signal generator 8 and a divider 11 divides the triangular wave signal by the mean effective value to adjust the triangular wave signal to a constant amplitude. Further, a multiplier 13 multipliers the triangular wave signal outputted by the divider 11 by the signal from the waveform shaper 5 to generate a saw-tooth wave signal. This saw-tooth wave signal is utilized as information showing an angle which is an integral multiple of the angle of rotation of an engine and a sine wave generator 14 generates a sine wave signal according to the information.
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Inventors:
Hiroshi Uchida
Norihiko Nakao
Norihiko Nakao
Application Number:
JP24381591A
Publication Date:
March 31, 2003
Filing Date:
September 24, 1991
Export Citation:
Assignee:
Mazda Corporation Inc
International Classes:
B60R11/02; G10K11/16; G10K11/178; H04R3/00; (IPC1-7): G10K11/178; B60R11/02; H04R3/00
Domestic Patent References:
| JP254678A | ||||
| JP2192209A | ||||
| JP5336162A | ||||
| JP4990070A | ||||
| JP3123105A | ||||
| JP611749U | ||||
| JP6093332U |
Attorney, Agent or Firm:
Hiroshi Maeda (2 outside)