Communications: electrical – Audible indication – Percussion-type sound producer
Patent
1975-08-26
1976-06-15
Sloyan, Thomas J.
Communications: electrical
Audible indication
Percussion-type sound producer
H03K 1317
Patent
active
039640612
ABSTRACT:
A method and apparatus for recording electrical signals on moving paper charts in which the magnitude of the electrical signal is translated into a digital number by a successive approximation type of analog to digital converter. The digital number can be used, as an example, to activate a group of switching elements to select and pass current through one of a plurality of small resistive elements diffused into a semiconducting material. This current causes the selected element to increase temperature to a value sufficient to cause an adjacent thermally sensitive paper to change its state and darken in the small area so heated, thus giving a record on the paper of the discrete position represented by the particular digital number and hence the magnitude of the original electrical signal.
REFERENCES:
patent: 3475749 (1969-10-01), Plice
patent: 3505668 (1970-04-01), Ottesen
patent: 3626407 (1971-12-01), Drangeld
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