Title:
REMOTE CONTROL SIGNAL TRANSMISSION SYSTEM
Document Type and Number:
Japanese Patent JP2616337
Kind Code:
B2
Abstract:
PURPOSE: To remove the infuluence of disturbance by transmitting a dummy signal having a prescribed time width just before transmitting a transmission signal.
CONSTITUTION: The system transmits the dummy signal D just before transmitting the transmission signal (remote control signal). Even when consinuous disturbance light N is generated (a). the dummy signal D is transmitted at first (b) to automatically reduce the gain of a light receiving part (c). The gain is made stable at the time of transmitting the reader code L of the transmission signal. Consequently, in the state of transmitting the transmission signal next to the dummy signal D, the gain of the light receiving part is reduced to be stable. Thus, the reader code L having a normal time width T is outputted (d) and CPU of a receiving part can normally read the transmission signal. The transient state of the gain changing of the light receiving part is absorbed with the dummy signal D and the gain corresponding to the point of the time is stably obtained at the time of transmitting the original transmission signal from the transmission part like this so that the influence of the disturbance light N can be removed.
Inventors:
Takahiro Egusa
Hideyuki Azumi
Hideyuki Azumi
Application Number:
JP6991592A
Publication Date:
June 04, 1997
Filing Date:
February 10, 1992
Export Citation:
Assignee:
Daikin Industries, Ltd.
International Classes:
H04Q9/14; H04L12/44; H04Q9/00; (IPC1-7): H04Q9/14; H04L12/44; H04Q9/00
Attorney, Agent or Firm:
Masahiro Nishimori