Active sound control apparatus
AssigneeHonda Motor Co., Ltd.
InventorsKosuke Sakamoto, Toshio Inoue, Akira Takahashi, Yasunori Kobayashi
Life of this patent
Estimating the term…
Abstract
An active sound control apparatus includes a delay circuit for delaying the output of a frequency component of a sound effect by delaying an engine rotation frequency signal representative of an engine rotation frequency [Hz], a delay circuit for delaying the output of an amplitude component of the sound effect by delaying an engine rotation frequency change signal representative of an engine rotation frequency change [Hz/second], and delay circuits for delaying the output of all components of the sound effect by delaying a control signal for controlling the outputs of speakers.
Claims6
An active sound control apparatus for generating a sound effect based on a vibratory noise source signal representative of information of a running state of a vehicle or an operating state of an engine, comprising:
- an output unit for outputting a frequency component of the sound effect in response to the vibratory noise source signal;
- an output unit for outputting an amplitude component of the sound effect in response to a change per unit time in the vibratory noise source signal;
- a multiplier for outputting the sound effect by multiplying the frequency component by the amplitude component;
- and
- a delay circuit for adding a delay to the frequency component of the sound effect,
- wherein the active sound control apparatus outputs the sound effect having a delayed frequency component with respect to the amplitude component.
An active sound control apparatus for generating a sound effect based on a vibratory noise source signal representative of information of a running state of a vehicle or an operating state of an engine, comprising:
- an output unit for outputting a frequency component of the sound effect in response to the vibratory noise source signal;
- an output unit for outputting an amplitude component of the sound effect in response to a change per unit time in the vibratory noise source signal;
- a multiplier for outputting the sound effect by multiplying the frequency component by the amplitude component;
- and
- a delay circuit for adding a delay to the amplitude component of the sound effect,
- wherein the active sound control apparatus outputs the sound effect having a delayed amplitude component with respect to the frequency component.
An active sound control apparatus for generating a sound effect based on a vibratory noise source signal representative of information of a running state of a vehicle or an operating state of an engine, comprising:
- a delay circuit configured to add a delay to an engine rotation frequency signal;
- and
- a multiplier configured to multiply a reference signal by a gain, the reference signal being sine-wave harmonics based on the delayed engine rotation frequency signal, the gain being determined based on a change per unit time in an engine rotation frequency, thereby outputting a sound effect having a delay on a frequency component of the sound effect.
An active sound control apparatus for generating a sound effect based on a vibratory noise source signal representative of information of a running state of a vehicle or an operating state of an engine, comprising:
- a delay circuit configured to add a delay to a change per unit time in an engine rotation frequency;
- and
- a multiplier configured to multiply a reference signal by a gain, the reference signal being sine-wave harmonics based on an engine rotation frequency signal, the gain being determined based on the delayed change per unit time in an engine rotation frequency, thereby outputting a sound effect having a delay on an amplitude component of the sound effect.
Dependencies are inferred from the claim text.