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==significance==sigsaly has been credited with a number of "firsts"; this list is taken from (bennett, 1983):# the first realization of enciphered telephony# the first quantized speech transmission# the first transmission of speech by pulse code modulation (pcm)# the first use of companded pcm# the first examples of multilevel frequency shift keying (fsk)# the first useful realization of speech bandwidth compression# the first use of fsk - fdm (frequency shift keying-frequency division multiplex) as a viable transmission method over a fading medium# the first use of a multilevel "eye pattern" to adjust the sampling intervals (a new, and important, instrumentation technique)==in popular culture==sigsaly was featured in neal stephenson's novel "cryptonomicon", in a conversation between the fictional character lawrence waterhouse and the historical character alan turing.
==importância==segundo o autor (bennett, 1983), o sigsaly é considerado com sendo o primeiro sistema no emprego de:# criptografia telefônica# transmissão da voz quantizada# transmissão da voz por modulação por código de pulso (pcm)# compansão em pcm# transmissão através de fsk de multinível# compressão da largura de banda do sinal de voz# transmissão em fsk - fdm (frequency shift keying-frequency division multiplex) em meios com fading# emprego do diagrama de olho para ajuste dos intervalos de amostragem==leia mais em...==* m. d. fagen (editor), "national service in war and peace (1925-1975)", volume ii of "a history of engineering and science in the bell system" (bell telephone laboratories, 1978) pp.