Pulse transmission line control system
AssigneeMatsushita Electric Industrial Co., Ltd.
InventorsAkio Tasaka, Hirokatsu Yui, Masahumi Ohno, Masashi Shibata
Life of this patent
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Abstract
To provide a pulse transmission line control system that can prevent a malfunction of microcomputers included in an apparatus configured by the microcomputers that have a function of decoding an electrical signal pulse generated from an infrared code sent from an infrared remote control unit. A main microcomputer A(1) controls on/off states of a switch (6) provided in a pulse transmission line (5) and turns on the switch (6) only when a sub-microcomputer B(2) performs a process on the infrared code sent form an infrared remote control unit (3).
Claims3
A system including a main microcomputer and a sub-microcomputer for performing a process according to an infrared code sent from an infrared remote control unit, comprising:
- an infrared ray detector for receiving said infrared code and converting said received infrared code into an electrical signal pulse;
- a pulse transmission line for transmitting said pulse to said main microcomputer and said sub-microcomputer;
- and
- a switch for connecting said sub-microcomputer to said pulse transmission line,
- wherein said main microcomputer selects and controls said switch according to whether or not transmission of said pulse to said sub-microcomputer is permitted and said pulse is transmitted to said sub-microcomputer when the transmission is permitted.
Dependencies are inferred from the claim text.