H - Electricity – 04 – Q
Patent
H - Electricity
04
Q
354/105
H04Q 9/14 (2006.01)
Patent
CA 1099413
Abstract Method and apparatus for serial data transmission wherein each data word has a fixed bit length and each bit is transmitted during a fixed dur- ation data period following a sync pulse. The sync pulse for each data word has a duration equal to a data period. Each data bit pulse has a duration less than a data period. The method and apparatus is particularly suitable for remote control systems for use with television receivers. Apparatus for receiving serial digital coded signals and converting them to parallel digital coded signals is described. The received signals are of the form having a predetermined number of equal time data periods, the first data period con- taining a sync pulse having a duration equal to a data period and at least one subsequent data period containing a data pulse; each data pulse is shorter than a data period. The apparatus comprises a digital clock producing two clock signals which are identical but displaced mutually by 90 electrical degrees. A digital counter produces enabling signals in response to the first clock signal, each enabling signal lasting one full cycle of the first clock signal. A detector senses a received sync pulse and enables the first and second clock signals and the counter upon the termination of the received sync pulse. A gating device sequentially gates the received signal to various outputs during successive data periods of the received signal, the gating device being controlled by the enabling signals from the counter and the second clock signal.
358699
Filliman Paul D.
Worley David W.
Smart & Biggar
The Magnavox Company
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