Sound-activated playback device
First Claim
1. A sound-activated playback device for playback of a recording on a selected prerecorded medium, said sound-activated playback device comprising:
- a noise sensor electrically connected to said playback device for detecting sound and generating an activating signal;
a microphone for receiving sounds and converting said sounds to an electrical signal;
a sound processing unit in electrical communication with said microphone for receiving and processing said electrical signal, said sound processing unit generating a processed signal;
a frequency filter in electrical communication with said sound processing unit and receiving said processed signal, said frequency filter generating a first enabling signal when said sounds received by said microphone define a frequency within a predetermined frequency range;
a noise level comparator in electrical communication with said sound processing unit and receiving said processed signal, said noise level comparator generating a second enabling signal when said sounds received by said microphone define a noise level at least as great as a predetermined noise level; and
a signal receiver in electrical communication with said frequency filter and said noise level comparator for generating said activating signal when said signal receiver receives said first enabling signal and said second enabling signal;
a timer in electrical communication with said signal receiver for receiving said activating signal, said timer for controlling a duration of playback of said recording;
a play switch in electrical communication with said timer for controlling said playback of said recording; and
a prerecorded medium reset for resetting said prerecorded medium to a starting point of said recording.
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Accused Products
Abstract
A sound-activated playback device which generally includes a sound-activated circuit and an electrically driven playback device which plays a recording on a selected prerecorded medium. The sound-activated circuit includes a noise sensor for sensing the sound of a crying child and activating the playback device. The sound-activated circuit also includes a timer for selecting and limiting the duration of playback of the recording, a timer override switch for overriding the timer, and a prerecorded medium reset for resetting the prerecorded medium after the playback device stops playing. Further, the sound-activated circuit includes a means for turning off the noise sensor until the playback device has finished playing and the prerecorded medium is reset.
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Citations
17 Claims
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1. A sound-activated playback device for playback of a recording on a selected prerecorded medium, said sound-activated playback device comprising:
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a noise sensor electrically connected to said playback device for detecting sound and generating an activating signal; a microphone for receiving sounds and converting said sounds to an electrical signal; a sound processing unit in electrical communication with said microphone for receiving and processing said electrical signal, said sound processing unit generating a processed signal; a frequency filter in electrical communication with said sound processing unit and receiving said processed signal, said frequency filter generating a first enabling signal when said sounds received by said microphone define a frequency within a predetermined frequency range; a noise level comparator in electrical communication with said sound processing unit and receiving said processed signal, said noise level comparator generating a second enabling signal when said sounds received by said microphone define a noise level at least as great as a predetermined noise level; and a signal receiver in electrical communication with said frequency filter and said noise level comparator for generating said activating signal when said signal receiver receives said first enabling signal and said second enabling signal; a timer in electrical communication with said signal receiver for receiving said activating signal, said timer for controlling a duration of playback of said recording; a play switch in electrical communication with said timer for controlling said playback of said recording; and a prerecorded medium reset for resetting said prerecorded medium to a starting point of said recording. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A sound-activated playback device for playback of a recording on a selected prerecorded medium, said sound-activated playback device comprising:
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a noise sensor electrically connected to said playback device for detecting sound and generating an activating signal; a timer override in electrical communication with said noise sensor for receiving said activating signal; a timer in electrical communication with said timer override for receiving said activating signal and controlling a duration of playback of said recording when said timer override is deactivated; a play switch in electrical communication with said timer and said timer override, said play switch for controlling said playback of said recording, said play switch being activated by said timer when said timer override is deactivated, said play switch being activated by said timer override when said timer override is activated; and a prerecorded medium reset for resetting said prerecorded medium to starting point of said recording. - View Dependent Claims (8, 9, 10, 11, 12)
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13. A sound-activated playback device for playback of a recording on a selected prerecorded medium, said sound-activated playback device comprising:
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a noise sensor electrically connected to said playback device for detecting sound and generating an activating signal; a microphone for receiving sounds and converting said sounds to an electrical signal; a sound processing unit in electrical communication with said microphone for receiving and processing said electrical signal, said sound processing unit generating a processed signal; a frequency filter in electrical communication with said sound processing unit and receiving said processed signal, said frequency filter generating a first enabling signal when said sounds received by said microphone define a frequency within a predetermined frequency range; a noise level comparator in electrical communication with said sound processing unit and receiving said processed signal, said noise level comparator generating a second enabling signal when said sounds received by said microphone define a noise level at least as great as a predetermined noise level; a signal receiver in electrical communication with said frequency filter and said noise level comparator for generating an activating signal when said signal receiver receives both said first enabling signal and said second enabling signal; a timer override in electrical communication with said signal receiver for receiving said activating signal; a timer in electrical communication with said timer override for controlling a duration of playback of said recording when said timer override is deactivated; a play switch in electrical communication with said timer and said timer override, said play switch for controlling said playback of said recording, said play switch being activated by said timer when said timer override is deactivated, said play switch being activated by said timer override when said timer override is activated; and a prerecorded medium reset for resetting said prerecorded medium to a starting point of said recording. - View Dependent Claims (14, 15, 16, 17)
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Specification