KR20000028040A - Method for allocating key code for remote controller - Google Patents

Abstract

PURPOSE: A method for allocating key codes is provided to effectively prevent malfunction of a remote controller by simultaneously transmitting a current operation value and an identified value to a key code signal of the remote controller. CONSTITUTION: In a method for allocating key codes for a remote controller, an operation connection degree is first calculated according to the possibility of a transformation from a first operation mode to a second operation mode(501S). A connection mode representing a performing frequency of each operation mode and a current operation state is then calculated(502S). Higher 3 bits of a data mode value of a remote control signal is formed using a connection degree difference between the first and second modes(503S), then lower 5 bits are formed as a typical connection degree value. Then, remote control signals are transmitted and received(505S), and a stored operation key value is compared with lower bits' values using a data code value of the received remote control signal(506S).

Description

How to Assign Key Codes on the Remote Control

The present invention relates to a remote control, and more particularly, to a method for allocating a key code of a remote control to transmit a current value and a confirmation value of an operation to a key code signal of the remote control to effectively prevent malfunction of the device.

In general, the remote control is a device for controlling the electronic device by transmitting the operation signal of the electronic device fixed to a fixed position from a remote.

In the current development trend of electronic devices aiming to increase the convenience of use, the remote control function is added to almost all electronic devices, and accordingly, a remote controller for controlling the electronic devices has become common in homes.

At present, there are many kinds of electronic devices and there are many factors that can interfere with the remote control signals, and various methods for accurate transmission and reception of remote control signals have been proposed.

Hereinafter, with reference to the accompanying drawings will be described with respect to the conventional licocon as follows.

1 is a schematic configuration diagram of a general remote controller, and FIGS. 2A and 2B are configuration diagrams of waveforms and signal formats of a conventional remote controller signal.

1 illustrates a schematic configuration of a remote controller. First, a switch input unit 1 for inputting an operation control signal by a user's selection and a frequency corresponding to a user selection signal input by the switch input unit 1 are generated. A frequency generator 2, a frequency modulator 3 for modulating the frequency signal output from the frequency generator 2 so as to be suitable for transmission, a transmission frequency amplifier 4 for amplifying and outputting the modulated frequency, The remote control is largely composed of a transmitting section 5 for transmitting the amplified transmission frequency.

The control target device (TV, VCR, etc.) controlled by the remote controller includes a receiver 6 for receiving a signal relating to operation control output from the transmitter 5 of the remote controller, and a frequency for demodulating the frequency of the received signal. A demodulator 7 and a reception frequency amplifier 8 for amplifying the demodulated frequency signal and outputting the demodulated frequency signal to a system controller of the corresponding device are largely constituted.

Here, the transmitter 5 and the receiver 6 consist of infrared rays generation and reception blocks.

The signal of the remote controller having such a configuration has a waveform as in FIG. 2A.

That is, the signals of the remote controller are transmitted and received in a predetermined format. The low level and high level signals are configured in the digital signal as shown in FIG. 2A.

A word unit signal configured in this manner and capable of controlling one operation is configured as shown in FIG. 2B.

That is, the signal of one word unit is composed of a head pulse, a custom code, and a data code.

Here, the head pulse indicates the start of the remote control signal, and the custom code indicates the manufacturer.

The data code represents a remote control key code according to the user's switch selection.

In this manner, the remote control signal is configured to transmit an operation control signal according to a user's selection to the corresponding device.

In the electronic device adopting the remote control function of the prior art, various control functions related to the operation of the main body are performed using the remote control, and there are many factors around the corresponding device that may interfere with the remote control signal. have.

In other words, in the case of a remote controller and a microcomputer system in which a single word signal recognizes a remote controller key consisting of a head pulse, a custom code, and a data code, the signal is completely exposed to external noise.

If noise is added to the remote control signal, the receiving system may malfunction.

Such noise is often generated when a strong light such as an external fluorescent lamp is mixed with a remote controller of another home appliance, and the control of the device using the remote controller in this state is inaccurate.

That is, the remote control of the prior art does not have a function to cope with external noise, causing a malfunction when controlling the target device by using the remote control, when the target device is a TV system increases the user's discomfort and reliability of the product Can drop.

If the target device is a VCR, there is a problem that an important recorded video may be deleted.

The present invention has been made to solve the problems in the signal transmission and reception operation of the conventional remote control, it is possible to effectively prevent the malfunction of the device by transmitting the current value and the confirmation value of the operation to the key code signal of the remote control at the same time. The purpose of the present invention is to provide a key code assignment method of a remote controller.

1 is a schematic configuration diagram of a general remote controller

2a and 2b is a configuration of the waveform and signal format of the remote control signal of the prior art

3 is a connection diagram of the operation of the VCR

4 is a table illustrating an embodiment of code value assignment according to a connection degree difference of an operation key of the present invention.

5 is a flowchart illustrating a key code allocation method of a remote controller according to the present invention.

The key code allocation method of the remote control according to the present invention prevents an error in the remote control operation due to external noise by transmitting the current value and the confirmation value of the operation to the key code signal of the remote control to prevent the malfunction of the device efficiently. It is possible to ensure the recognition and operation of the correct key code by carrying an additional key signal together with the remote control key signal consisting of n + m bit signals and decrypting it in the microcomputer.

Hereinafter, a key code assignment method of a remote controller according to the present invention will be described in detail with reference to the accompanying drawings.

3 is an operation connection diagram of a VCR, and FIG. 4 is a table showing an embodiment of code value assignment according to a connection degree difference of an operation key of the present invention.

A generalized diagram of the VCR operation and key presses can be shown in Figure 3.

In other words, it is a diagram showing that the transition to all operations is possible in the stop state STOP, but the rewind (REW) operation during recording (REC) is not performed.

In the same sense, the fast forward (FF) operation during the playback (PB) operation means the fast playback (CUE).

The general operation characteristics of such a VCR are shown numerically as shown in FIG. Connection degree indicates the frequency of the operation and at the same time the current state of the operation.

Moreover, the continuation of the same operation does not need to be considered because the current state of the operation is known.

The present invention is to give a code of each operation key with the operation and connection diagram.

The keycode value consisting of 8 bits can be assigned by the following rules. That is, the three bits D0-D2 represent differences in the connectivity. For example, STOP → REW can be expressed as '010' because the difference in connectivity is 2.

The remaining five bits (D3-D7) represent unique key values of six operation keys.

Although five bits may represent 32 different key values, in the exemplary embodiment of the present invention, six operation keys are represented, so that the remaining 26 may be assigned numbers and other key values.

In such key value assignment, the value of each key value should have a difference as much as the connection diagram in FIG. 4. That is, key value can be assigned as STOP: 5 → 00101, PB: 4 → 00100, FF: 6 → 00110.

Here, the connection diagram is not an absolute value, but represents a relative value of each operation.

The change in the connectivity of FF from 3 to 6 is arbitrary, and it can be seen that the key value can be determined as long as it does not deviate greatly from the concept of the connectivity.

That is, other methods may be used as STOP (6), PB (5), REW (4), and FF (3) without departing from the concept of the connection diagram.

This key code value recognizes the difference in connectivity between D0-D2 and the current operation when it is recognized by the microcomputer, and the value of D0-D2 that recognizes the difference between the key value up to D3-D7 and the current operating key value. It goes through the verification process.

If the signal is mixed with external noise (noise), it is different from the value indicated by D0-D2 and the key value indicated by the current key value and D3-D7. In this case, the remote control signal is ignored.

If the maximum value of the connectivity is 16 and there are 16 types of keys, the bits representing the connectivity difference may be allocated to D0-D3 and the bits representing the key value may be allocated to D4-D7.

In this case, keys other than the operation of the VCR, that is, numeric keys or power keys, can be differentiated from the operation keys by allocating D0-D2 to a value outside '000' or the maximum connection degree.

The present invention simultaneously transmits the current value and the confirmation value of the execution operation to the data code of the remote control signal consisting of a head pulse, a custom code, and a data code in one word unit.

Referring to the operation procedure according to the remote control key code assignment method of the present invention as follows.

5 is a flowchart illustrating a key code allocation method of a remote controller according to the present invention.

According to the present invention, the current value and the confirmation value of the execution operation can be simultaneously transmitted to the 8-bit data code constituting the remote control signal.

First, an operation connection diagram is constructed according to the possibility of transition from each operation mode to another operation mode (501S).

Obtain a connection diagram (numerically expressed) that can indicate the frequency of execution of each operation mode and the current state of the operation (502S).

The upper 3 bits of the data code value of the remote control signal are configured as the difference value of the connection degree (503S).

If the connection value of mode A is `3 'and the connection value of mode B is` 5', the difference in connection value when switching from mode A to mode B is `2 ', so the upper 3 bits are set to` 010'. 'To assign.

The lower 5 bits are allocated as the unique connectivity value (504S). That is, since the unique connectivity value of the B mode is `5 ', it is assigned as` 00101'.

When the data code allocation value of the remote control signal is configured as described above, it is transmitted and received.

When the remote control signal is received through the receiver of the corresponding device, the difference between the stored operation code value and the lower 5 bit (D3 ~ D7) value is obtained using the data code value of the received remote control signal, and the upper 3 bits (D0 ~ D2) are obtained. Compare with value (506S).

Here, if the comparison result is the same, the corresponding operation is performed. Otherwise, the received remote controller signal is ignored and the operation mode is not changed.

In the present invention as described above, the key code allocation method simultaneously transmits the current value and the confirmation value of the execution operation to the data code of the remote control signal and detects an error of the remote control signal using the same.

The effect of external noise generated by fluorescent lights or other external factors on the remote control signal can be minimized, so that the device can be accurately controlled by the remote control.

Claims (1)

In the assignment of the code value of the data code of the remote control signal consisting of the head pulse, the custom code and the n + m bit data code, Constructing an operation connection diagram according to a transition possibility from each operation mode to another operation mode, and using the same, obtaining a unique connection value that can indicate an execution frequency of each operation mode and a current state of the operation; Obtaining the upper n bits of the data code value of the remote control signal when the mode is switched and obtaining the difference in the connectivity value between the modes; Assigning a unique connectivity value of the mode to switch to the lower m bits of the data code value; Transmitting and receiving the data code assignment value of the remote control signal when it is configured; Obtaining a difference between an operation code value being stored and a lower m bit value using a data code value of the received remote controller signal and comparing the same with the upper n bit value; And performing a corresponding operation if the comparison result is the same, or otherwise changing the operation mode by ignoring the received remote control signal.