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Pseudonoise generation device and pseudonoise generation method

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Pseudonoise generation device and pseudonoise generation method


A determination part specifies the road width upon which the vehicle CR is traveling based on the current position of a vehicle CR detected by a position detection part, referring to road width information in a storage part. The part determines an arrival ranges for pseudonoise being outputted outside the vehicle based on the specified road width. Subsequently, a control part determines audio volume settings for pseudonoise from left and right speakers of a pseudonoise generation part, based on the determined arrival range. As a result, pseudonoise at audio volumes corresponding to the audio volume settings is outputted outside the vehicle from the speakers of the part. Thus, the output of the pseudo engine noise is properly controlled with in consideration for the presence of the possible subject to be warned in a variety of surroundings changed depending on the classification of the road.
Related Terms: Audio Rounding

USPTO Applicaton #: #20130016851 - Class: 381 86 (USPTO) - 01/17/13 - Class 381 
Electrical Audio Signal Processing Systems And Devices > Vehicle

Inventors: Koji Asao, Junichi Tanaka

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The Patent Description & Claims data below is from USPTO Patent Application 20130016851, Pseudonoise generation device and pseudonoise generation method.

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TECHNICAL FIELD

The present invention relates to a pseudonoise generation device, a pseudonoise generation method, a generation program for pseudonoise, and a recording medium in which the generation program is stored.

BACKGROUND ART

In recent years, electric automobiles employing batteries as a drive power source and hybrid cars employ the batteries as partial drive power source have become popular. When such an automobile uses the battery as the drive power source to drive, the drive noise level outside of the vehicle becomes dramatically lower as compared to those from a conventional gasoline vehicle. As a result, it may happen that a pedestrian or a cyclist does not notice a vehicle approaching to them from outside his field of view. The occurrence of the situation is a serious traffic safety problem.

Due to this, a technique has been proposed for outputting a running noise corresponding to the running condition of the vehicle outside the vehicle (see Patent Document #1, hereinafter, it is referred to as “prior art #1”). In the technique of the prior art #1, the running noise is output outside the vehicle ahead or the like through a speaker for generating a pseudonoise signal based on the detection results of the vehicle speed, the rotational speed of the motor as the power source, the accelerator position, and so on. Then, it is controlled whether the traveling sound is output or not, depending on a region type through which the vehicle is traveling.

Moreover, a technique has been proposed (see Patent Document #2, hereinafter called the “prior art #2”) for automatically warning a pedestrian existing ahead in a traveling direction of the vehicle, although it is not the technique for outputting a engine pseudonoise corresponds to the running condition of the vehicle or the like. In the technique of the prior art #2, a subject presents ahead in the traveling direction of the vehicle are detected. If the subject is detected, the subject is warned by using a warning sound outputted from the speaker.

PRIOR ART DOCUMENTS Patent Literature

Patent Document #1: Japanese Laid—Open Patent Publication 2005-253236 Patent Document #2: Japanese Laid—Open Patent Publication Heisei 7-209424

SUMMARY

OF THE INVENTION Problems to be Solved by the Invention

The technique of the prior art #1 controls the execution/non-execution of pseudonoise output, depending on the region type through which the vehicle is traveling. However, it does not control the pseudonoise output in consideration of the road condition upon which the vehicle is traveling. As a result, if the region type is the same, it cannot control the running noise output with consideration for the probable presence of the pedestrian or the cyclist or the like around the vehicle.

Moreover, the technique of the prior art #2 outputs the warning sound only in cases which the subject exists ahead in the traveling direction is detected. As a result, for example, the vehicle approach cannot be warned, when the pedestrian, the cyclist or the like cannot be detected because they are hidden by a building or the like.

Due to this, the technique is eagerly awaited for properly alerting the pedestrian, the cyclist or the like to the approach of the vehicle, even if they cannot be detected by the vehicle. It is raised as one of the problems to be solved by the present invention for responding a request.

The present invention has been completed under the above-mentioned circumstances. Its object is to provide a pseudonoise generation device and a method for generating pseudonoise, wherein the pseudonoise is properly controlled, considering to the probability of the subject to be warned, which changes depending on the lane class upon which the vehicle is traveling.

Means for Solving the Problems

When viewed from a first standpoint, the present invention is a pseudonoise generation device that is mounted to a vehicle and outputs pseudonoise from a sound output unit to the outside of said vehicle, characterized by comprising: a storage unit in which is stored map information that includes road width information; a position detection unit that detects the current position of said vehicle; a determination unit that determines a pseudonoise arrival range over which pseudonoise outputted from said sound output unit is to arrive, on the basis of road width information for the road upon which said vehicle is traveling; and a control unit that controls the output of pseudonoise from said sound output unit to correspond to said range that has been determined.

And, when viewed from a second standpoint, the present invention is a pseudonoise generation method employed by a pseudonoise generation device that outputs pseudonoise from a sound output unit to the outside of a vehicle, characterized by comprising: an acquisition process of acquiring road width information for the road upon which said vehicle is traveling; a determination process of determining a pseudonoise arrival range over which pseudonoise outputted from said sound output unit should arrive, on the basis of said acquired road width information; and a control process of controlling the output of pseudonoise from said sound output unit to correspond to said range that has been determined.

Moreover, when viewed from the third standpoint, the present invention is a generation program for vehicle-evocative sound, wherein it causes a calculation part to execute a generation method for vehicle-evocative sound according to the present invention.

Furthermore, when viewed from the fourth standpoint, the present invention is a recording medium, wherein a generation program for vehicle-evocative sound according to the present invention is recorded thereon so as to be readable by a calculation part.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a block diagram for explaining the configuration of a generation device for pseudonoise of the first embodiment of the present invention;

FIG. 2 is the block diagram for explaining the configuration of a pseudonoise generation device according to the second embodiment of the present invention;

FIG. 3 is the block diagram for explaining the configuration of a navigation device according to an embodiment of the present invention;

FIG. 4 is a figure for explaining the configuration of a pseudonoise generation unit of FIG. 3;

FIG. 5 is a flow chart for explaining a pseudonoise generation control processing performed by a control unit of FIG. 3;

FIG. 6 is the flow chart for explaining the first road width processing of FIG. 5;

FIG. 7 is the figure for explaining an arrival range for engine pseudonoise due to first normal output processing of FIG. 6;

FIG. 8 is the figure for explaining an arrival range for engine pseudonoise due to first extended range output processing of FIG. 6;

FIG. 9 is the flow chart for explaining second road width processing of FIG. 5;

FIG. 10 is the figure for explaining an arrival range for engine pseudonoise due to second normal output processing of FIG. 9;

FIG. 11 is the figure for explaining an arrival range for engine pseudonoise due to third normal output processing of FIG. 9;

FIG. 12 is the flow chart for explaining third road width processing of FIG. 5; and

FIG. 13 is the figure for explaining an arrival range for engine pseudonoise due to fourth normal output processing of FIG. 12.

DESCRIPTION OF THE PREFERRED EMBODIMENTS

Embodiments of the present invention are explained with reference to the appended drawings. Note that the same or equivalent elements are given the same reference symbols to omit the duplication in the explanation and drawings in below.

The First Embodiment

First, the first embodiment of the present invention is explained with reference to FIG. 1.

<Configuration>

FIG. 1 shows the schematic configuration of a pseudonoise generation device 700A of the first embodiment. As shown in FIG. 1, the pseudonoise generation device 700A is mounted to a vehicle CR.

The pseudonoise generation device 700A comprises a storage part 710 and a position detection part 720. Moreover, the pseudonoise generation device 700A comprises a determination part 740, a control part 750, and a pseudonoise generation part 760A.

A variety of information utilized by the device 700A is stored in the part 710. The information comprises map information. The map information includes road width information and the information opposite lane presence information.

The position detection part 720 detects the current position of the vehicle CR. The current position detected by the position detection part 720 is sent to the determination part 740A.

The determination part 740A receives the current position of the vehicle CR sent from the position detection part 720. The determination part 740A determines ranges over which pseudonoise being outputted to the outside of the vehicle by the pseudonoise generation part 760A should arrive (hereinafter, it is referred to as simply the “arrival ranges”) on the basis of the current position, referring to the map information in the storage part 710. The determined arrival ranges for pseudonoise are sent to the control part 750. Note that the determination processing by the determination part 740A is described hereinafter.

The control part 750 receives the arrival ranges from the determination part 740A. The control part 750 sends audio volume settings necessary for ensuring the arrival ranges to the sound output part 760A.

The pseudonoise generation part 760A comprises a pseudonoise signal generation part, an audio volume adjustment part, and one or more speakers. In the first embodiment, the pseudonoise generation part 760A includes two speakers: a left speaker for outputting the sound ahead of the vehicle CR on the left, and a right speaker for outputting the sound ahead of it on the right. Note that the control part 750 provides mutually independent volume settings for each of the left and the right speakers.

The pseudonoise generation part 760A receives audio volume settings from the control part 750. In the pseudonoise generation part 760A, the audio volume adjustment part adjusts the pseudonoise signals generated by the pseudonoise signal generation part 760A according to the audio volume settings, and thereby pseudonoise is outputted outside the vehicle CR from the speakers.



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Managing audio output through an intermediary
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Stationary apparatus for portable electronic device
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Electrical audio signal processing systems and devices
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stats Patent Info
Application #
US 20130016851 A1
Publish Date
01/17/2013
Document #
13637283
File Date
03/25/2010
USPTO Class
381 86
Other USPTO Classes
International Class
04B1/00
Drawings
11


Audio
Rounding


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