×

Sound-activated playback device

  • US 5,452,274 A
  • Filed: 06/09/1994
  • Issued: 09/19/1995
  • Est. Priority Date: 06/09/1994
  • Status: Expired due to Fees
First Claim
Patent Images

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.

View all claims
  • 0 Assignments
Timeline View
Assignment View
    ×
    ×