Process for synchronizing audio playback on a smartphone with content displayed on a digital sign

A method of operating a plurality of signboards, the method comprising the steps of:

• receiving a request from a smartphone for an audio clip corresponding to one of the signboards, the request including:
• a geographic location of the smartphone;
• and
• a cardinal direction in which a camera on the smartphone is directed;
• determining that the one signboard is within a visible range of the smartphone, the determining being dependent upon the geographic location of the smartphone;
• ascertaining that the one signboard may be within the field of view of the camera, the ascertaining being dependent upon the cardinal direction in which the camera on the smartphone is directed;
• selecting the audio clip corresponding to the one signboard from a plurality of audio clips, the selecting being dependent upon the determining step and upon the ascertaining step;
• and
• downloading the selected audio clip to the smartphone.

A method of operating a signboard, the method comprising the steps of:

• receiving from a motor vehicle:
• a geographic location of the vehicle;
• and
• a cardinal heading direction of the vehicle;
• identifying a signboard that is visible to a person within the vehicle, the identifying being dependent upon the geographic location of the vehicle and the cardinal heading direction of the vehicle;
• selecting an audio clip corresponding to the signboard from a plurality of audio clips, the selecting being dependent upon the identifying step and upon a time-of-day;
• and
• downloading the selected audio clip to the vehicle.