Toy vehicle engine sound device
First Claim
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1. An electric toy vehicle system of the type in which at least one controller controls electric power to at least one toy vehicle, comprising:
- means for sensing current in said electric power; and
means for producing an acoustic output having a characteristic which is varied in response to said means for sensing current;
said means for sensing current including a resistor in series with said electric power, said resistor being operative to develop a voltage thereacross in response to said current; and
wherein said electric current is alternating current, said voltage is an alternating voltage, and said means for sensing current further includes means for detecting said alternating voltage.
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Abstract
An engine-sound accessory for an electric toy vehicle produces a sound output which varies its characteristics in proportion to an electric input to the toy vehicle. The apparatus measures the total electric current fed to the toy vehicle to produce a sound control signal proportional thereto. When two or more vehicles are fed from a common power source, the apparatus is responsive to the sum of the electric current fed to the two or more vehicles whereby variation in the electric current fed to one or both of the vehicles produces a corresponding variation in the sound characteristic.
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Citations
13 Claims
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1. An electric toy vehicle system of the type in which at least one controller controls electric power to at least one toy vehicle, comprising:
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means for sensing current in said electric power; and means for producing an acoustic output having a characteristic which is varied in response to said means for sensing current; said means for sensing current including a resistor in series with said electric power, said resistor being operative to develop a voltage thereacross in response to said current; and wherein said electric current is alternating current, said voltage is an alternating voltage, and said means for sensing current further includes means for detecting said alternating voltage. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An electric toy vehicle system of the type in which at least one controller controls electric power to at least one toy vehicle, comprising:
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means for sensing current in said electric power; and means for producing an acoustic output having a characteristic which is varied in response to said means for sensing current; and a second controller controlling electric power to a second toy vehicle independently of the control of electric power to said one toy vehicle by said one controller, and said means for sensing current is effective to sense the total current fed to said one and second toy vehicles, whereby said characteristic is varied in response to the total current fed to said one and second toy vehicles. - View Dependent Claims (11, 12)
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13. An acoustic accessory for an electric toy vehicle game of the type having an ac power source, at least first and second electric toy vehicles and first and second controllers independently operable to control at least the amplitude of power applied to respective electric toy vehicles, said accessory comprising:
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means for sensing the total current applied to said first and second electric toy vehicles; and means for producing an acoustic output having a characteristic which is varied in response to said means for sensing.
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Specification