Baby calmer
First Claim
1. A baby calmer device for producing when energized a single sequence of sound levels adapted to calm a crying baby, comprising generator means for generating noise over an audio frequency range extending up to at least two thousand hertz and reducing means connected to said generator means for automatically reducing the level of said noise by a single sequential step change from an initial sound level to a lower second sound level and subsequently by a single sequential step change to an imperceptible third sound level after which the device is automatically switched OFF.
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Abstract
A baby calmer comprises a source of sound adapted to calm a crying baby, with the sound taking the form of random noise or pseudo-random noise which extends over an audio frequency range preferably extending up to at least 10 kilohertz. The pseudo-random noise is generated for a short period at an initial level so that it is able to penetrate the baby'"'"'s own crying and to attract its attention. The noise is subsequently switched to a lower level to lull the baby into sleep. After a few minutes the sound is switched off altogether.
22 Citations
14 Claims
- 1. A baby calmer device for producing when energized a single sequence of sound levels adapted to calm a crying baby, comprising generator means for generating noise over an audio frequency range extending up to at least two thousand hertz and reducing means connected to said generator means for automatically reducing the level of said noise by a single sequential step change from an initial sound level to a lower second sound level and subsequently by a single sequential step change to an imperceptible third sound level after which the device is automatically switched OFF.
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14. A baby calmer device for producing when energized a single sequence of sound levels adapted to calm a crying baby, comprising:
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first timing circuit means adapted to produce a first timer output having an active output signal for a first time duration corresponding to an initial sound level time period and an inactive output thereafter; second timing circuit means adapted to produce a second timer output having an active output signal for said duration of said initial sound level time period plus a second time duration of a second sound level time period and an inactive output thereafter; a voltage generating means coupled to said first and second timer outputs and adapted to generate a voltage output having a first level when both said timer outputs have active output signals, a second lower level when only said second timer output has an active output signal, and a zero output when both timer outputs have inactive output signals; noise source means having a zener diode connected to said voltage output operable for producing a noise signal the level of which being proportional to said voltage output level; amplifier means connected to said noise source means for producing an amplified noise signal; cut-off filter means connected to said amplifier means and adapted to filter out from said amplified noise signal the frequency components above an audio frequency range extending up to at least two thousand hertz; and converter means connected to said filter means for converting said amplified noise signal into audio noise.
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Specification