Communications: electrical – Audible indication – Percussion-type sound producer
Patent
1986-07-25
1987-03-24
Sloyan, T. J.
Communications: electrical
Audible indication
Percussion-type sound producer
340347AD, 340347DA, 340347M, 361 1, 375 6, 455 40, 455 41, 307351, H03M 100
Patent
active
046528571
ABSTRACT:
A method and apparatus for transmitting and receiving messages by electromagnetic induction in a power restricted environment is disclosed in which the message bandwidth is narrowed prior to transmission and restored to its original breadth upon reception. This is accomplished by imputting a signal of a given duration into a signal storage means and outputting the signal from the storage means over a longer duration. The signal must be converted into a form suitable for storage. In a first preferred embodiment this is accomplished by converting the message to a digital form inputting it into a signal storage means, retrieving the message from storage at a rate different from the input rate and converting the retrived message to analog form. In a second preferred embodiment the signal is differentiated, and converted into a square wave; the zero crossings are identified and stored. The method and apparatus here disclosed permit transmission of a message with a minimum power input and thus are particularly useful in mines and other power restricted areas.
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Shipkovitz Samuel
Sloyan T. J.
Snider Ronald R.
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