Telegraphy – Systems – Printing
Patent
1977-02-11
1978-11-21
Birmiel, Howard A.
Telegraphy
Systems
Printing
178 22, 325 38A, H04K 102
Patent
active
041267613
ABSTRACT:
An input audio frequency analog signal, for example, speech, which is to be passed through a noisy transmission channel, is scrambled at the sending end by repetitively performing a modulo-v (MOD v) addition of an n-level, m-pulse codeword with an n-level digitized transformation of the input signal under the condition that m and v are integers. The resultant sum signal, after transmission through a noisy channel (which may be an acoustic medium, a conventional telephone link, a conventional CB radio link, etc.), is received at the receiving end and descrambled. Descrambling is achieved by carrying out a Mod v subtraction process involving repetitively subtracting the same codeword from an n-level digitized transformation of the received signal, the subtraction being carried out in synchronism with the addition at the sending end. The resultant difference signal is a representation of the input signal and is relatively insensitive to noise present in the transmission channel.
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Causey G. Donald
Cohn David L.
Graupe Daniel
Birmiel Howard A.
Sandler Donald M.
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