Communications: electrical – Audible indication – Electronic
Patent
1995-08-29
1998-05-19
Swarthout, Brent A.
Communications: electrical
Audible indication
Electronic
104296, 3403843, 446410, G08B 310
Patent
active
057540942
ABSTRACT:
A sound generating apparatus for movable objects, particularly model trains, generates audible sounds from digital signal representations of actual train sounds prestored in a memory mounted on the object. In one embodiment, the stored digital sound representations are divided into sets, with each set assigned to a different speed range of movement of the object. Each set includes a plurality of subsets, each containing distinct sound representations which can vary in volume and/or pitch. A central processing unit selects the appropriate set from the memory in response to the actual speed of movement of the object and randomly selects the subsets within the selected set as long as the object remains in a given speed range. In another embodiment, a single set is formed of a plurality of subsets. Each subset contains an identical number of sound representations which vary from subset to subset and within each subset in volume and/or pitch. The CPU randomly selects a sound representation from any of the subsets for each of plurality of consecutively generated sounds. Upon sensing speed variations, the CPU adjusts the length of the leader and/or tail end of each sound for faster or slower sound generation.
REFERENCES:
patent: 5174216 (1992-12-01), Miller et al.
patent: 5195920 (1993-03-01), Collier
patent: 5267318 (1993-11-01), Severson et al.
patent: 5555815 (1996-09-01), Young et al.
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