Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1994-08-01
1996-09-24
Peng, John K.
Communications: electrical
Condition responsive indicating system
Specific condition
340635, 341173, 341178, 455 383, 455 384, G08B 2100
Patent
active
055594999
DESCRIPTION:
BRIEF SUMMARY
PRIOR ART
The invention is based on a receiver for receiving information transmitted without the use of wires, in particular by infrared signals, according to the generic part of the main claim. A receiver is already known from DE-OS 28 24 421. This receiver contains a microprocessor, a memory and a receiving unit. However, this receiver is not provided with a display unit so that it is impossible to display the reception status of the receiver. Further, it is known from DE-OS 28 48 533 to provide the receiver with a display unit which displays the status (active/inactive) of an alarm system connected to tile receiver. The alarm system is installed along with the receiving unit and display unit, e.g. in a motor vehicle, and can be switched on and off by remote control with a battery-operated transmitter. Two light-emitting diodes (red/green) in the display unit show whether the alarm system is switched on or off.
ADVANTAGES OF THE INVENTION
The receiver according to the invention with the characterizing features of the main claim has the advantage over the prior art that it displays the reception status. Accordingly, the user receives an acknowledgement as to whether or not the information transmitted by the user by a battery-operated transmitter has successfully reached the receiving unit. In the absence of an acknowledgment and if the transmission is not successful after repeated attempts, it remains unclear which device (transmitter or receiver) contains the error. This can lead to unnecessary replacement of the receiver module or transmitter module. Such unneeded repairs are prevented by the subject matter of the present invention.
Advantageous further developments and improvements in the receiver indicated in the main claim are made possible by the steps contained in the subclaims. In the event of incomplete information it is advantageous, for example, to activate the display unit to output an incompleteness signal. This incompleteness signal could, at the same time, request a change of battery in the transmitter, for example. This is an error which occurs frequently in practice and is manifested by partial receipt of information by the receiver, after which information is no longer correctly received because the transmission becomes increasingly weaker when the transmitter battery is defective.
DRAWING
An embodiment example of the invention is shown in the drawing and explained more fully in the following description.
FIG. 1 shows a schematic view of a transmitter/receiver device;
FIG. 2 shows a block diagram of a transmitter;
FIG. 3 shows the light signal for the transmission of an information word;
FIG. 4 shows the: information word corresponding to the light signals of FIG. 3;
FIG. 5a shows the voltage: and current curve of the light emitter in the transmitter with well-charged battery;
FIG. 5b shows the voltage and current curve of the light emitter in the transmitter with discharged battery;
FIG. 6 shows a block diagram of the receiver;
FIG. 7 shows a structogram for a program to be run in the evaluating unit of the receiver.
DESCRIPTION OF THE EMBODIMENT EXAMPLE
FIG. 1 shows an IR transmitter 10 with an infrared transmitting diode 11 and an IR receiver 12 with a light receiver 16 and light-emitting diodes 13, 14 and 15 as display unit 30. For example, the IR transmitter 10 can be a remote-control transmitter for a wide range of applications including televisions, stereo systems, motor vehicle alarm systems, door locking mechanisms, video recorders, satellite reception installations, etc. The IR receiver 12 can be integrated in the device to be controlled for the respective application.
FIG. 2 shows the formal construction of an IR transmitter 10 in a block diagram. The transmitter 10 has a microprocessor 17 and a key-actuated memory 18 connected to the latter. Further, a driver stage 19 is connected to the microprocessor 17. This driver stage 19 is connected in turn with a light emitter 11. A battery 20 which can supply power to the microprocessor 17 by activating a push-button 21 is
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Mannava Ashok
Peng John K.
Robert & Bosch GmbH
Striker Michael J.
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