JPH026277B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a device that displays the reception status of a remote control signal.

[Conventional Example] Conventionally, a circuit as shown in FIG. 1 has been often used for the purpose of displaying the reception status of a remote control signal. In FIG. 1, reference numeral ``A'' indicates a light-receiving section for optically modulated remote control signals, which is currently widely used, and serves to demodulate the remote control signal and output it in the form of an electrical signal. The output signal B of this light receiving section A is a pulse train modulated by pulse intervals. The signal discrimination circuit C converts this signal B into parallel data and forms an output corresponding to the data. For example, if the data "1" and "0" are determined by the interval with respect to the reference time T as shown in FIG. 2, E and F, the signal B in FIG.

Now, in Fig. 1, if signal B is integrated by resistor R1 and capacitor C1, and a certain level is detected via resistors R2 and R3, Q1 is made conductive and light emitting diode D1 is lit, a continuous remote control signal is generated. For example, considering a signal consisting of 3 bits of data, a display as shown in FIG. 3H can be made.

However, in the circuit shown in Figure 1, the input remote control signal may emit light even if it is not completed as shown in Figure 3 (2), or there may be wide pulse noise as shown in Figure 3 (2). This does not provide an accurate reception indication.

[Object of the Invention] An object of the present invention is to accurately display a remote control signal so that a user can easily determine whether remote control is being performed correctly.

[Structure of the Invention] The present invention provides a system for controlling display elements by sequentially blinking display elements in synchronization with the incoming signals when the remote control signals arrive one after another at regular intervals and the signals are determined to be valid. , which attempts to dynamically display the reception status of remote control signals, includes a circuit that receives a remote control signal in which a pulse train arrives at regular intervals, discriminates the signal, and a remote control circuit that uses the discriminated signal as a valid signal. A circuit for identifying whether or not the signal is a signal, a plurality of display elements arranged in parallel, and an output of the identification circuit, and when the determined signal is a valid remote control signal, the In synchronization with a remote control signal that arrives at regular intervals, the plurality of display elements are sequentially turned on at regular intervals starting from the ends thereof, and are turned on for a period multiple times the regular interval, so that the display elements at the same end are turned on at regular intervals. and a circuit for sequentially turning off the lights at regular intervals.

[Description of Embodiments] FIG. 4 shows an example of a remote control signal discrimination circuit and an example of a display device of the present invention that operates in response to the output thereof. FIG. 5 shows waveforms at various parts of the circuit shown in FIG. 4. In addition, the signals of each part of the circuit in Fig. 4 are indicated by lowercase letters.
The corresponding waveforms are shown in FIG. 5 with the same alphanumeric characters in parentheses.

When signal a is input, D flip-flops 1 and 2 and gate 3 detect the rise of signal b, and signal d is applied to counter 4 as a load pulse. Counter 4 takes in setting data e by signal d and counts clock f. Then, when the count exceeds the setting data e,
Counter 4 outputs overflow signal g and applies it to shift register 5. Now, assuming that the remote control signal a is in the format shown in Figure 2, if the setting data e is set to 2.5T,
When the data is “0”, the signal g is at a low level,
When the data is "1", the signal g becomes high level.
The shift register 5 shifts the signal g at the rising edge of the remote control signal a. moreover,
At the rise of the next pulse of signal a, data e is set in the counter 4 and counting starts again. In this way, for example, when the signal a is 3-bit data consisting of four pulse trains, the output of the shift register 5 is "101" in this example, and the signal a encoded by the pulse interval is converted into a parallel signal expressed by the level. 2
Can be converted to a forward signal.

Now, if the signal a is a train of N pulses and the signal is valid when the shift register 5 reads N data, the counter 6 counts the signal d, and the gate 7 counts the signal d. and decode N. Further, when the N+1th pulse arrives within a certain period of time, the signal is determined to be invalid. Therefore, a counter 8 is provided and data k is set therein. The counter 8 counts the pulse interval using the clock f, and when the count value indicates a pulse interval exceeding the data k, the counter 8
assumes that the remote control signal a has been completed and outputs an overflow signal i. A signal j is formed by ANDing this overflow signal i and the output signal h of the gate 7. This signal j becomes the pulse that completes the remote control signal.

This pulse j is added to the shift register 10 as a shift pulse, and the shift register 1
When the Nth output is inverted and added to the input of 0, every time the signal j is applied, the shift register 1
The outputs Q1, Q2...QN of 0 become high level sequentially like (n), (o), (p) in response to the input signal as shown in Figure 6 a', and when all become high level, Return to lower level. By connecting each output Q1, Q2...QN of the shift register 10 to the base of the transistor 11, and connecting the light emitting element 12 to the collector of each transistor 11, the continuous The light emitting element can be driven in synchronization with the remote control signal that arrives.
FIG. 7 shows an example of the display.

Here, an example of a specific display mode will be explained.
Here, remote control IC for TV
The remote control signal transmitted by the MN6025 (manufactured by Matsushita Electronics Co., Ltd.), which is often used as a remote controller, will be received. In this remote control signal, a pulse train modulated by pulse interval is repeated at an interval τ of 100.8 msec (Note: The basic pulse period T is 0.42 msec, and one group of pulse trains is
During the 120T period, the distance between the pulse train groups is
Since the period is 120T, the repetition period τ of the pulse train group is 0.42 (msec) x (120 (T) + 120 (T)) = 100
.8
msec). Therefore, six display elements are arranged side by side as shown in FIG. 7, and the outputs of the shift register 10 and transistor 11 are used to sequentially change
(=100.8 msec), and each display element is turned on for 6τ (=604.8 msec), and sequentially from the leftmost one at τ (100.8 msec).
Turn off the light every time. Then, after 604.8 msec from the leftmost display element being turned on, all elements up to the rightmost display element are turned on, and then the lights go out from the leftmost display element to the rightmost display element at 604.8msec. Therefore, the individual lighting period of each display element is as long as 6τ (604.8 msec), so it is sufficiently visible, and the blinking movement is also 6τ (604.8 msec).
Since it used to move from the left end to the right end, it could be visually recognized as sequential blinking with sufficient directionality.

Note that if the repetition interval τ of the pulse train of the remote control signal is short (for example, τ = 32 m as shown in Utility Model Application No. 121466/1983)
sec (=12 msec + 20 msec)), the number of display elements used may be increased, and each display element may be turned on for τ×X periods (for example, in the case of the above example, If X = 10, each display element lights up for 320 msec, and
msec, it turns on and off from the left end to the right end, so it is visible as a moving display).

The counter 6 is cleared by the completion signal j, returns to its initial state, and waits for the next remote control signal. The counter 9 functions to return the display circuit 13 to its initial state when no remote control signal arrives for a certain period of time or more. FIG. 8 shows its operation. The counter 9 internally sets a counter setting value l in response to the signal d, and starts counting. At this time, if the interval between consecutively arriving pulse trains of the remote control signal a is τ, if the interval from the completed signal to the next arriving pulse train is at least τ or more, the remote control signal is sent continuously. The counter 9 outputs a non-completion signal m. In this case, the value of l may be f×l>τ.

[Effects of the Invention] As described above, according to the present invention, when the continuously arriving remote control signals are valid, the display elements can be displayed with directionality in synchronization with the signals, and the remote control The reception status of the signal can be dynamically displayed in an easy-to-understand manner to the user.

[Brief explanation of drawings]

Fig. 1 shows a conventional display device, Fig. 2 shows an example of a remote control signal, Fig. 3 shows a display state of a conventional display device, Fig. 4 shows an embodiment of the present invention, and Fig. 5 shows an example of a remote control signal. The timing diagram in the example of the present invention shown in FIG. 6 is the waveform of the display signal of the present invention, and FIG.
The figure is an example of the display according to the present invention, and FIG. 8 is a timing diagram in the example of the present invention. 1, 2...D flip-flop, 3...gate, 4...counter, 5...shift register, 6
...Counter, 7...Gate, 8...Counter,
9...Counter, 10...Shift register.

Claims (1)

[Claims] 1. A circuit that receives a remote control signal in which a pulse train arrives at regular intervals and discriminates the signal, and a circuit that discriminates whether the discriminated signal is a valid remote control signal, and a plurality of circuits arranged in parallel. and a plurality of display elements controlled by the output of the identification circuit in synchronization with the remote control signal that arrives at the constant interval when the determined signal is a valid remote control signal. It is characterized by comprising a circuit that sequentially turns on the light from the end thereof at the above-mentioned fixed intervals, turns on the light for a period multiple times the fixed interval, and turns off the light from the same end at the above-mentioned fixed interval. display device.