JPH11265185A - Device for reducing noise inside car - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the level of merchandise appeal and convenience at the time of adopting a device for reducing noise inside car. SOLUTION: This device is provided with a noise detecting means 1 for detecting a noise, control circuit 2 for preparing a secondary audio signal by adjusting the phase and amplitude of a signal from the noise detecting means 1, secondary sound source 3 for receiving the secondary audio signal from this control circuit 2 and radiating it as the sonic wave having a phase almost inverted from the noise and an equal amplitude inside a car, and display 4 for displaying the reduction effect of the noise. Thus, the operating conditions of noise reduction at the active and inactive time of the device itself can be reported.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle interior noise reduction device.

[0002]

2. Description of the Related Art Conventionally, there is an example in which a vehicle interior noise reduction device is implemented, but its operation or effect is not displayed. This may be due to the car manufacturer's concern that the displayed noise level might be perceived as being poor, and that the end user was not interested in the operation because it was not particularly operated And the like.

[0003]

However, it is disadvantageous for both the manufacturer and the end user that the vehicle interior reducing device cannot be appealed while employing it.

[0004]

SUMMARY OF THE INVENTION In order to solve this problem, the present invention aims to improve the product appeal to the manufacturer by providing a display in the cabin reduction device positively, For this, it is possible to increase the operation check and the entertainment.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 of the present invention provides a noise detecting means for detecting noise, and a control for adjusting a phase and an amplitude of a signal from the noise detecting means to create a secondary sound signal. Circuit, a secondary sound source that receives the secondary sound signal from this control circuit and radiates it as a sound wave having approximately the same phase and the same amplitude as the noise in the vehicle cabin, and a display that displays the noise reduction effect. And has an effect of improving the appeal and usability of the device itself.

According to a second aspect of the present invention, in the vehicle according to the first aspect, the display is configured to display an amount substantially proportional to the reduced noise amount. This is an indoor noise reduction device that has the effect of improving the appeal and usability of the device itself.

[0007] According to a third aspect of the present invention, in the first aspect of the present invention, the display device displays a first amount which is substantially proportional to a noise amount when the device itself is not operating. A vehicle interior noise reduction device, comprising: a level indicator; and a second level indicator for displaying an amount substantially proportional to a noise amount when the device itself operates. And has the effect of improving usability.

According to a fourth aspect of the present invention, there is provided a noise detecting means for detecting noise, a control circuit for adjusting a phase and an amplitude of a signal from the noise detecting means to create a secondary sound signal,
In a state in which the secondary sound signal is received from the control circuit and is radiated as a sound wave having substantially the same phase and the same amplitude as the noise in the passenger compartment, and the noise reduction device is performing the noise reduction operation,
A vehicle interior noise reduction device characterized by having an indicator showing its operation, which has an effect of improving the appeal and usability of the device itself.

According to a fifth aspect of the present invention, in the first aspect of the present invention, the display device has a first frequency-modulated frequency which is substantially proportional to a noise amount when the device itself is not operating. And a second signal that is frequency-modulated by an amount substantially proportional to the amount of noise in a state where the noise reduction device is operated. It has the effect of improving appeal and usability.

According to a sixth aspect of the present invention, in the fifth aspect of the present invention, the display device performs Lissajous display using the first signal and the second signal. It is a reduction device and has the effect of improving the appeal and usability of the device itself.

According to a seventh aspect of the present invention, in the second aspect, the display device displays a Lissajous display of a signal frequency-modulated by an amount substantially proportional to the reduced noise amount and a reference signal. This is a device for reducing vehicle interior noise, which has the effect of improving the appeal and usability of the device itself.

According to an eighth aspect of the present invention, in the first aspect of the present invention, the display includes a first signal which is a noise spectrum signal in a state where the apparatus itself is not operating, and A vehicle interior noise reduction device characterized by displaying by using a second signal that is a spectrum signal in a state where the device itself is operated, and has an effect of improving the appeal and usability of the device itself.

According to a ninth aspect of the present invention, in accordance with the eighth aspect of the present invention, the display device displays a difference between the first signal and the second signal as a spectrogram, and displays an effect amount and a frequency portion. This is a vehicle interior noise reduction device characterized by changing the display of lightness, hue, and the like in accordance with the condition, and has an effect of improving the appeal and usability of the device itself.

According to a tenth aspect of the present invention, in the tenth aspect, the display unit displays a spectrum of the reduced noise signal as a spectrogram, and displays brightness or hue according to an effect amount and a frequency portion. And the like, which changes the display of the vehicle interior noise, and has the effect of improving the appeal and usability of the device itself.

FIG. 1 shows an embodiment of the present invention.
This will be described with reference to FIG. (Embodiment 1) FIG. 1 is a block diagram of a vehicle interior noise reduction apparatus according to Embodiment 1 of the present invention. An output signal of a noise detecting means 1 is connected to a control circuit 2, and an output of the control circuit 2 is It is connected to the next sound source 3 and acts to reduce the noise in the vehicle cabin by emitting a secondary sound having the opposite phase and the same amplitude as the noise.

In addition, a display 4 is provided separately. FIG. 2 shows an example of a display on the display of the device, where corresponds to the first signal and corresponds to the second signal.
2 (a) shows two bars, FIG. 2 (b) shows one bar, and FIG. 2 (c) shows one pie graph. Here, the first signal refers to a signal substantially proportional to the amount of noise during non-operation, and the second signal refers to a signal substantially proportional to the amount of noise during operation.

The operation of the first embodiment will be described. The noise signal detected by the noise detection means 1 is phase-
The amplitude is adjusted to create a secondary sound signal.

The secondary sound signal is radiated by the secondary sound source 3 into the vehicle cabin as a sound wave having the same phase and amplitude as the noise, and performs a noise reduction operation.

FIG. 2 (a) shows an example in which the display unit 4 displays the noise amount when the apparatus itself is not operating and the noise amount when the apparatus itself is operating, and FIG. 2 (b) shows an example in which one bar graph is used. FIG. 2C shows an example in which a single pie chart is displayed, and the arrow portion fluctuates according to the noise fluctuation.

By displaying the actual operation status of noise reduction as shown in FIG. 2, the manufacturer can improve the product appealing power, and can improve the operation confirmation and entertainment for the user. Is what you can do.

(Embodiment 2) FIG. 3 shows another example of the display on the display unit of the apparatus, in which corresponds to the first signal and corresponds to the second signal. FIG. 3A shows an example in which two spectra are displayed, FIG. 3B is an explanatory diagram of the effect of the spectrum of the reduction operation, and FIG. 3C is an example in which a spectrogram is displayed. Here, the first and second signals mean the signals in the first embodiment.

The operation of the second embodiment will be described. FIG. 3 (a) shows an example in which a noise spectrum when the reduction device is not operating and a noise spectrum when the reduction device is operating are separately shown in FIG. 3) shows an example in which the difference spectrum before and after the reduction shown in FIG. 3B is displayed as a spectrogram.

As the intensity display parameter of the spectrogram, a change in brightness or hue can be used.

By displaying the actual operation status of noise reduction as shown in FIG. 3, the manufacturer can improve the product appealing power, and the user can confirm the operation and increase the entertainment. Is what you can do.

(Embodiment 3) FIG. 4 shows still another example of the display on the display unit of the apparatus, corresponding to the first signal.
Corresponds to the second signal. By using one of these two signals as the X axis and the other as the Y axis, a Lissajous waveform can be displayed. Here, the first and second signals mean the signals in the first embodiment.

The operation of the third embodiment will be described. The noise amount when the reduction device is not operating is A, and the noise amount during operation is B.
When the reference signal S0 is S0 = Cos (ω0 · t), the frequency modulation signals S1 and S2 using A and B
S1 = Cos (ω0 · (1 + A / C) · t + P1) S2 = Cos (ω0 · (1 + B / C) · t + P2)

Here, C is a constant for setting the degree of modulation within a desired range, and P1 and P2 are desired phase values for giving a change when displayed.

FIG. 4 shows the display as S1 as the first signal.
Shows an example in which a Lissajous waveform is displayed using S2 as the second signal.

By displaying the actual operation status of noise reduction as shown in FIG. 4, the manufacturer side can improve the product appeal, and the user side can confirm the operation and increase the entertainment property. Is what you can do.

The display graph in the embodiment is as follows.
It goes without saying that other illustrated graphs can be used other than this example.

Further, it is also possible to perform simple display using one signal and a reference signal or a difference signal and a reference signal without using two signals.

[0032]

As described above, by positively providing a display in the cabin reduction device, it is possible to improve the product appealing power for the manufacturer side, and to confirm the operation and the entertainment property for the user side. It can be achieved.

[Brief description of the drawings]

FIG. 1 is a system block diagram of a vehicle interior noise reduction device according to a first embodiment of the present invention.

FIGS. 2A, 2B, and 2C are diagrams showing display examples on a display device in the same device.

3 (a), (b), (c) Embodiment 2 of the apparatus
Figure showing a display example on the display unit in

FIGS. 4A, 4B, and 4C are diagrams showing display examples of a display device according to a third embodiment of the device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Noise detection means 2 Control circuit 3 Secondary sound source 4 Display

Claims (10)

[Claims] 1. A noise detecting means for detecting noise, a control circuit for adjusting a phase and an amplitude of a signal from the noise detecting means to generate a secondary sound signal, and receiving a secondary sound signal from the control circuit. A vehicle interior noise reduction device comprising: a secondary sound source that emits a sound wave having substantially the same phase and the same amplitude as a noise in a vehicle interior; and a display that displays a noise reduction effect. 2. The display device according to claim 1, wherein the display is configured to display an amount substantially proportional to the reduced noise amount.
A vehicle interior noise reduction device according to claim 1. 3. A display device comprising: a first level indicator for displaying an amount substantially proportional to a noise amount when the device itself is not operating; and an amount substantially proportional to the noise amount when the device itself is operating. 2. The vehicle interior noise reduction device according to claim 1, further comprising: a second level indicator that displays the following. 4. A noise detecting means for detecting noise, a control circuit for adjusting a phase and an amplitude of a signal from the noise detecting means to generate a secondary sound signal, and receiving a secondary sound signal from the control circuit. Vehicle equipped with a secondary sound source radiating as a sound wave having substantially opposite phase and equal amplitude to noise in a vehicle cabin, and a display indicating the operation of the device itself when the device itself is performing a noise reduction operation. Indoor noise reduction device. 5. A display device comprising: a first signal frequency-modulated by an amount substantially proportional to a noise amount in a state where the apparatus itself is not operating; The vehicle interior noise reduction device according to claim 1, wherein the display is performed using the frequency-modulated second signal. 6. The vehicle interior noise reduction device according to claim 5, wherein the display performs Lissajous display using the first signal and the second signal. 7. The vehicle interior noise reduction device according to claim 2, wherein the display performs Lissajous display using a signal that is frequency-modulated by an amount substantially proportional to the reduced noise amount and a reference signal. 8. The display includes: a first signal that is a noise spectrum signal when the device itself is not operating;
The vehicle interior noise reduction device according to claim 1, wherein the display is performed using a second signal that is a spectrum signal in a state where the device itself operates. 9. The display device according to claim 1, wherein a difference between the first signal and the second signal is spectrogram-displayed, and a display such as lightness and hue is changed according to the effect amount and the frequency portion. 9. The vehicle interior noise reduction device according to 8. 10. The vehicle according to claim 1, wherein the display device displays a spectrum of the reduced noise signal as a spectrogram, and changes a display such as lightness and hue according to an effect amount and a frequency portion. Indoor noise reduction device.