Computer Science – Information Theory
Scientific paper
Mar 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975jbis...28..161h&link_type=abstract
British Interplanetary Society, Journal, vol. 28, Mar. 1975, p. 161-167.
Computer Science
Information Theory
Communication Theory, Extraterrestrial Life, Interstellar Communication, Signal Encoding, Space Communication, Channels (Data Transmission), Information Theory, Multivariate Statistical Analysis, Random Processes, Signal Detection
Scientific paper
The discussion deals with two questions: assuming a signal has been detected, does the signal contain a message. If so, how can it be deciphered. The concept of the message as a statistical variate is explained. When the suspected sequence of elements is examined for randomness, if any departure from randomness is found, the presence of a message is indicated. Detection of several independent organizations approaches proof of the existence of a message. In answer to the second question, some linguistic concepts are brought forward. A common experience and accord on a symbol for that experience are required for communications. Interspecies experiential differences make the first condition difficult to meet. It is argued that the frequency of the hydrogen line would constitute such a commonality. A search for a beacon frequency could commence not at integral multiples of this frequency, but at multiples by some universal constant, such as pi or e. A hypothetical interstellar message is given which first gives the code, i.e., Morse, in terms of number symbols, a likely common ground; then transmits the number pi in those symbols; then repeats the message.
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