Vehicle presence notification apparatus
AssigneeDenso Corporation
InventorToshiaki NAKAYAMA
Life of this patent
Estimating the term…
Abstract
Notice sounds having different sound qualities are generated simultaneously outside a vehicle via an in-vehicle parametric speaker having a first directionality and an in-vehicle dynamic speaker using a vehicular horn unit having a second directionality having a broader emission angle as compared with the first directionality. Both the notice sound via the parametric speaker and the notice sound via the dynamic speaker reach the ears of a person outside the vehicle in different sound pressures based on a difference between the first directionality and the second directionality. A sound tone of a notice sound actually heard by the person outside the vehicle varies according to a travel direction and travel speed of the vehicle.
Claims13
A vehicle presence notification apparatus in a vehicle for indicating a presence of the vehicle outward from the vehicle, the apparatus comprising:
- a notice sound preparation portion to prepare a source signal to generate a predetermined notice sound being audible outside of the vehicle;
- a first speaker that has a first directionality;
- a second speaker that has a second directionality that has a broader emission angle as compared with the first directionality of the first speaker;
- and
- a sound quality diversity portion that prepares a first sound diversity signal and a second sound diversity signal by attaching different frequency characteristics to the source signal prepared by the notice sound preparation portion and inputs the first diversity signal and the second diversity signal to the first speaker and the second speaker, respectively,
- wherein:
- the first speaker generates the predetermined notice sound having a first sound quality outside of the vehicle based on the first sound diversity signal;
- the second speaker generates the predetermined notice sound having a second sound quality outside of the vehicle based on the second diversity signal, the second sound quality being different from the first sound quality;
- and
- the notice sound having the first sound quality and the notice sound having the second sound quality are simultaneously audible outside of the vehicle.
A vehicle presence notification apparatus in a vehicle for indicating a presence of the vehicle outward from the vehicle,
- the vehicle presence notification apparatus comprising:
- a first speaker having a first directionality, the first speaker being a parametric speaker that emits an ultrasonic wave, which is prepared by performing an ultrasonic modulation on a signal, outward from the vehicle;
- a second speaker having a second directionality having a broader emission angle as compared with the first directionality of the first speaker, the second speaker being a dynamic speaker that directly emits a sound;
- and
- a notice sound preparation portion to prepare a source signal by attaching a predetermined notice sound with a plurality of frequencies, which are designated with predetermined frequency intervals, according to a traveling state of the vehicle, the notice sound preparation portion then inputting the source signal to each of the first speaker and the second speaker,
- wherein:
- the first speaker emits an ultrasonic wave outward from the vehicle to generate the notice sound with the plurality of frequencies to be audible at a position distant from the vehicle, the ultrasonic wave being prepared by performing an ultrasonic modulation on the source signal;
- and
- the second speaker emits the notice sound with the plurality of frequencies directly outward from the vehicle based on the source signal.
Dependencies are inferred from the claim text.