|
RYRYRYRY... is a character string that was widely used to test a five-level teleprinter or RTTY channel. The characters ''R'' and ''Y'' are "01010" and "10101" in 5-bit ITA2 code, also known as Baudot. Thus they are Boolean complements of each other. Switching between the two characters is a stressful test for electromechanical teleprinters.〔(''An Introduction to Amateur Radioteletype'' p.10 )〕 Repeated over and over, ''RYRYRYRY...'' outputs a carrier wave that regularly and rapidly shifts back and forth in frequency. This signal pattern also provided a test for signal polarity; if polarity was reversed, the test signal would print as "SG".〔(Digital Signal Types )〕 The corresponding string of complementary characters in 7-bit ASCII is ''U *U *U *U *...'' ==References== 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「RY (test signal)」の詳細全文を読む スポンサード リンク
|