Acoustic modulation of road surface

Abstract

Methods for arrangement of studs or dents over the road surface in a way that when a vehicle passes on the road, a desired sound that is dependent on the driving speed and the arrangement and properties of the studs or dents is generated into the vehicle. The studs or dents are attached to the road and used to pass audio information such as warnings to the driver.

1 . System for generation of a required audible sound within a vehicle passing on road surface, said system comprising of low profile studs or dents in any shape that are pre arranged over the road surface.  
   
   
       2 . System for generation of a required audible sound within a vehicle passing on road surface, said system comprising areas of different smoothness that are pre-arranged over the road surface.  
   
   
       3 . The system according to  claim 1  wherein modulation is used to modulate analog information or digital information with the audible sound.  
   
   
       4 . The system according to  claim 1  wherein the studs or the dents are designed to cause minimum vibration in the vehicle and maximum acoustic sound.  
   
   
       5 . The system according to  claim 1  wherein the studs or the dents are spread all over the road width in a way that vehicle gets the acoustical data regardless of its position.  
   
   
       6 . The system according to  claim 1  wherein the studs or the dents are located in part of the road width in a way that vehicle gets the acoustical data according to its position.  
   
   
       7 . The system according to  claim 1  in which the studs or the dents are remotely controlled and are adapted to change characteristics such as shape, width or height.  
   
   
       8 . The system according to  claim 1  wherein modulation intensity is expressed by controlling the height of the studs or dents.  
   
   
       9 . The system according to  claim 1  wherein modulation intensity is expressed by controlling the shape of the studs or dents.  
   
   
       10 . The system according to  claim 1  wherein modulation intensity is expressed by controlling a width of a contact area between the wheel and the studs or dents.  
   
   
       11 . The system according to  claim 1  wherein contact between the wheel with the stud or depression causes an acoustic impulse response that is to modulate a required sound signal within the vehicle.  
   
   
       12 . The system according to  claim 11  wherein a series of studs or dents with different modulation intensities are positioned in such a distance that when a vehicle passes at a certain speed, a narrow band acoustic sound is detected within a vehicle whose frequency is dependent on the vehicle speed.  
   
   
       13 . The system according to  claim 1  wherein a series of studs or dents are positioned in such a distance between each other that when a vehicle passes at a certain speed, a wide acoustics impulse response is generated whose duration depends on the number of studs or dents, and which is used to modulate a required sound signal within the vehicle.  
   
   
       14 . The system according to  claim 13  wherein a series of wide impulse responses with different intensities is arranged in such a way that when a vehicle passes at a certain speed, a narrow band acoustic sound is detected within a vehicle whose frequency is dependent on the vehicle speed.  
   
   
       15 . The system according to  claim 12  wherein the studs or dents are arrange in such a way that the wheel of a vehicle moving at a certain speed hits more than one stud at the same time with a time delay between hits that causes a series of acoustics impulse responses or a wide acoustics impulse response to be generated and expressed as a narrow bandwidth sound signal within the vehicle.  
   
   
       16 . The system according to  claim 12  wherein the studs or dents are arranged in such a way that when hit at the same time by a wheel of a vehicle moving at a certain speed a number of narrow bandwidth signals with different frequencies are produced, that compose the required sound within the vehicle.  
   
   
       17 . The system according to  claim 8  wherein the distance between studs or dents is constant and is relative to the sampling rate of the acoustic signal.  
   
   
       18 . The system according to  claim 8  wherein the distance between studs or dents in a narrow bandwidth signal is dependent on the main frequency of the narrow bandwidth signal.  
   
   
       19 . The system according to  claim 17  that is being adapted to generate a narrow bandwidth signal to the vehicle.  
   
   
       20 . The system according to  claim 19  comprising a number of narrow bandwidth signal generators set up over the road so as to generate respective signals having different frequencies when hit at the same time by a wheel of a moving vehicle so as to produce the required acoustical signal within the vehicle.