Communications: electrical – Audible indication – Percussion-type sound producer
Patent
1974-08-30
1976-11-02
Sloyan, Thomas J.
Communications: electrical
Audible indication
Percussion-type sound producer
235154, 340171PF, H03K 1300, H04B 1100
Patent
active
039900711
ABSTRACT:
A data transmission system is disclosed in which the information to be transmitted comprises a plurality of unit information pieces each of which in turn is indicated by a numerical code of a binary number or a binary-coded decimal number having a predetermined number of bits. One of said numerical codes makes up a fundamental matrix of a frequency permutation code comprising a plurality of different frequency signals; the number of times by which the information in the form of numerical codes shifts the elements of the fundamental matrix on the basis of weight constants determined by said number of bits is detected; each numerical code is converted into a permutation code in response to the above-mentioned detection and transmitted at the transmitting end in the form of a plurality of different frequency signals according to the elements of the shifted permutation code; the frequency signals thus transmitted are received and stored in sequence and detection is made as to how many shifts are required in order that the matrix elements of said stored permutation code may be made identical to with the fundamental matrix; and the permutation code is converted into a numerical code by calculation of the detected number of shifts and the weight constants.
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Ito Tetsuo
Nishihara Motohisa
Hitachi , Ltd.
Sloyan Thomas J.
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