JPH0456516B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] This invention relates to improvements in remote control transmitters.

[Conventional technology]

The circuit configuration of a remote control transmitter is generally as shown in FIG. 2, and includes an oscillation circuit 1 with an oscillation stop function that generates a reference signal, a timing generation circuit 2, and a scan output circuit 4 that scans a keyboard matrix 3. and a key input circuit 5,
An instruction circuit 6 that determines the key input signal from the keyboard matrix 3 and sets the output timing of the transmission signal, a first counter circuit 7 that sets the operating order of the instruction circuit 6, The output circuit 8 receives an output signal from the traction circuit 6 and outputs a transmission signal 70.

Also, Fig. 3 shows the output terminal 4 of the scan output circuit 4.
a scan signal on keyboard matrix 3,
This is a time chart of signals input to the input terminal 5a of the key input circuit 5 and other parts when the key is turned on and off.

Figure a shows the input state of the input terminal 5a of the key input circuit 5, and Figures b, c, and d show the output terminals 4a, 4b, and 4b of the scan output circuit 4, respectively.
4c, that is, the scan output signal, g to j in the figure show the count values of the counter 7, and e in the figure
shows the transmission signal 70, and f in the same figure shows the oscillation state of the oscillation circuit 1.

The operation of the remote control transmitter constructed in this way will be explained with reference to the time chart of FIG.

First, in the key input standby state (period A) in which no key in keyboard matrix 3 is turned on,
The state of the input terminal 5a of the key input circuit 5 is "H" as shown in FIG. ", the transmission signal 70 is at "L" as shown in figure e, and the counter circuit 7 for setting the operating order of the instruction circuit is shown in figure g.
As shown in ~j, the count is in the initial state,
The oscillation circuit 1 is in an oscillation stopped state, as shown in FIG.

Point α is when a key of the keyboard matrix 3 is turned on, and at this time, the input terminal 5a of the key input circuit 5 detects "L" of the output terminal 4a of the scan output circuit 4, and thereby the instruction circuit 6 causes the oscillation circuit 1 to start oscillating, and the counter circuit 7 starts counting as shown in FIG. 3 g to j. According to the order in which the count value of the counter circuit 7 advances, the instruction circuit 6 determines the key input, selects the transmission signal corresponding to the key input, and the output circuit 8 outputs the transmission signal 7 as shown in FIG.
Outputs 0 (period B).

Next, if there is no key input (period C), the instruction circuit 6 determines that there is no key input, and as a result, the oscillation circuit 1 and timing generation circuit 2 stop their operations, so the scan signal 4
a, 4b, and 4c become "L" as shown in b, c, and d of the figure, and the count value g~ of the counter circuit 7
j becomes the initial state (point β).

As a result of the above operation, when a key of the keyboard matrix 3 is turned on, the oscillation circuit 1 operates, and when the key is turned off, the oscillation circuit 1 stops oscillating.

By the way, in general, the environment in which a remote control transmitter is used often has a lot of noise, etc., and if the count circuit 7 that sets the operating order of the instruction circuit malfunctions, the instruction circuit 6 will be in an inoperable state. However, the oscillation circuit 1 may continue to oscillate.

An example of this state will be explained using the time chart shown in FIG. In this figure 4, figure a
~j indicate the same signals as a~j in Figure 3;
Figure k shows the reset signal for the counter circuit 9, Figure 4 l
indicates a reset signal for the counter circuit 7.

The state up to period B is the same as the case in FIG. The point at which the count value becomes larger than the currently used count value (g to j in the figure) is defined as the γ point. After this point γ, the instruction circuit 6 becomes inoperable, the oscillation circuit 1 continues to oscillate, and there is a risk that the state of period D cannot be escaped.

In other words, there is a risk that the battery will be wasted unnecessarily, and furthermore, it will become impossible to escape from the state where transmission is impossible. To escape from such a runaway state, it is necessary to turn off the power and then turn it on again to perform initial settings.

Therefore, in this conventional circuit, in order to eliminate such a problem, a second counter circuit 9 is provided to count the clocks from the timing generation circuit, and an output signal is output from the instruction circuit 6 to the output circuit 8 depending on the presence or absence of a level change. The counter circuit 9 generates a reset pulse (see FIG. 4G) when the counter circuit 9 finishes counting, which started when the oscillation circuit 1 started oscillating.
is issued to force the counter circuit 7 to a constant count value and return to the oscillation stopped state, that is, the initial state before the key input (point ξ in FIG. 4). Note that when the instruction circuit 6 outputs the output signal to the output circuit 8, the determination circuit 10 outputs a reset signal for the counter circuit 9 (see k in the same figure), so that the counter circuit 7 is reset during normal operation. I'm trying not to.

To provide a remote control transmitter which eliminates the above-mentioned drawbacks with a simple configuration and can be used without any concerns even in a place with a bad environment or a lot of noise. I can do it. The addition of the counter circuit 9 and the determination circuit 10 was developed by the applicant.

[Problem that the invention seeks to solve]

However, in the configuration of this conventional circuit, as shown in FIG. 5, if the output interval W of the transmission output signal (see e in the same figure) is longer than the count time of the counter circuit 9, the counter circuit 9 ends counting. It becomes necessary to reset the counter circuit 9 before, that is, before the initial state is reached. In order to reset the counter circuit 9 at point k, it is necessary to output an output signal from the instruction circuit 6 to the output circuit 8, but because of this output signal, the output signal from the output circuit 8 is different from the original transmission signal. , a false transmission signal is output (pulse N in Figure 5 e), and if the output circuit is one that drives an infrared LED, the battery will drain quickly due to the large current flowing even for a short time. It becomes exhausting. Furthermore, since the receiving system receives the signal as noise, there is a fear that the burden on the receiving system will increase in order to avoid malfunctions on the transmitting side.

Note that a to e in FIG. 5 indicate the same signals as in FIG. 4 a to e, FIG. 5 f indicates a reset signal for the counter circuit 9, and FIG.

In view of the above points, the present invention has been made to solve such problems, and its purpose is to provide a remote control transmitter that eliminates the drawbacks of the conventional circuits described above.

[Means for solving problems]

In order to achieve such an object, the remote control transmitter according to the present invention includes a delay circuit between the instruction circuit 6 and the output circuit 8, so that the output signal from the instruction circuit is delayed for a certain period of time. The instruction circuit is configured so that the output signal from the instruction circuit is not transmitted to the output signal when the instruction circuit receives a signal indicating that the output signal cannot be transmitted.

[Effect]

In this invention, a delay circuit is provided between the instruction circuit and the output circuit,
When the instruction circuit issues an output instruction signal to reset the second counter circuit, the signal is invalidated while it is in the delay circuit.
Even when the interval between transmission signals is greater than the count value of the second counter circuit, transmission of false transmission signals is avoided and battery consumption is prevented.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows a remote control transmitter according to an embodiment of the present invention, and in the figure, the same reference numerals as in FIG. 2 indicate corresponding parts. Reference numeral 11 denotes a delay circuit, which delays the output signal from the instruction circuit for a certain period of time and prevents the output signal from being transmitted to the output circuit when a signal indicating that output is not allowed is input from the determination circuit. It is composed of

Note that in the instruction circuit of this embodiment, when an interval occurs in the transmission signals, the second counter circuit 9
A signal that outputs a signal indicating that the transmission signal is to be outputted to the delay circuit 11 until the count ends, and transmits to the determination circuit 10 that the output signal is invalid while the signal is present in the delay circuit 11. is set to output.

Further, when the determination circuit 10 receives a signal to output the original transmission signal and a pseudo transmission signal for resetting the counter circuit 9, it only resets the counter circuit 9 and changes the contents of the delay circuit 11. No signal to disable is output. Conversely, when the instruction circuit outputs a signal indicating that the output signal is invalid, only the delay circuit 11 is controlled so that the contents of the delay circuit 11 are not output to the output circuit 8, and the counter circuit 9 is not reset. do not have.

FIG. 6 is a time chart showing the operation of this embodiment. In the figure, the same reference numerals as in FIGS. 2, 3, and 5 indicate corresponding signals, periods, timing, etc. c indicates a signal indicating that the output signal cannot be transmitted from the determination circuit 10 to the delay circuit 11.

Next, the operation of the embodiment shown in FIG. 1 will be explained using FIG. 6. Point α is when the key of the keyboard matrix 3 is turned on. At this time, the input terminal 5a of the key input circuit 5 detects "L" of the output terminal 4a of the scan output circuit 4, and the oscillation circuit 1 starts oscillating. Then, the counter circuit 7 starts counting. The instruction circuit 6 determines the key input according to the order in which the count value of the counter circuit 7 advances, selects the transmission signal corresponding to the key input, and the output circuit 8 transmits the transmission signal (see a in the figure) to the delay circuit 11. The output is delayed by the delay time.

The counter circuit 9 starts counting when the oscillation circuit starts oscillating. The determination circuit 10 detects a change in the level of the transmitted signal and outputs a reset signal (b in the figure) to the counter circuit 9. Counter circuit 9
When the reset signal is input, the counter value is reset.

However, if the interval W between the transmission signals corresponding to key inputs is larger than the count value of the counter circuit 9, it is necessary to reset the counter circuit 9 before it finishes counting (point k). For this purpose, the instruction circuit 6 transmits a signal indicating that an output signal is to be outputted to the determination circuit 10, so that the determination circuit 10 outputs a reset signal to the counter circuit 9. At this time, the delay circuit 11 prevents the output signal from the instruction circuit from being transmitted to the output circuit 8. Next, the instruction circuit 6 transmits a signal to the determination circuit 10 to invalidate the current output signal, and the determination circuit 1
0 can prevent unnecessary output signals from being sent to the output circuit by transmitting to the delay circuit 11 a signal (see FIG. 6c) that nullifies the output signal in the delay circuit 11. .

In this way, it is possible to eliminate the drawback of the conventional circuit that the count value of the counter circuit 9 cannot be reset without outputting a transmission signal, thereby preventing battery consumption and reducing the amount of noise to the receiving system of the conventional circuit. The problem of increasing the load on the receiving system by outputting a signal is solved, and a remote control transmitter capable of transmitting transmitting signal outputs at long intervals can be provided.

In the above embodiment, the instruction circuit required a signal to convey the invalidity of the output signal, but after counting the reference signal of the oscillation circuit for a certain period of time using a counter circuit, the transmission signal in the delay circuit is It may be made invalid, and the same effect as the above embodiment can be obtained.

〔Effect of the invention〕

As described above, according to the remote control transmitter of the present invention, when the transmission interval is longer than the count time of the second counter circuit for stopping the transmitter from running out of control, a pseudo transmission signal is output to the outside. Since the second counter circuit can be reset without having to do anything, power consumption and malfunctions on the receiving side due to this pseudo transmission can be completely eliminated, which is extremely effective in practice.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing a remote control transmitter according to an embodiment of the present invention, FIG. 2 is a block diagram showing the circuit configuration of a conventional remote control transmitter, and FIGS. 3, 4, and 5 are A time chart for explaining the operation of the conventional device shown in FIG. 2,
FIG. 6 is a time chart for explaining the operation of the embodiment shown in FIG. 1...Oscillation circuit, 2...Timing generation circuit,
3...Keyboard matrix, 4...Scan output circuit, 5...Key input circuit, 6...Instruction circuit, 7...First counter circuit, 8...
...Output circuit, 9...Second counter circuit, 10...
...Judgment circuit, 11...Delay circuit.

Claims (1)

[Claims] 1. An oscillation circuit that generates a reference signal, a timing generation circuit that receives a reference signal from this oscillation circuit and generates a timing clock, and an m×n (m and n are integers) keyboard matrix. a scan output circuit that outputs m scan signals to this keyboard matrix; a key input circuit that receives n outputs of the keyboard matrix; and a key input circuit that determines key inputs of the keyboard matrix from this key input circuit. an instruction circuit that sets the output timing of the transmission signal; a first counter circuit that counts the timing clock and sets the operating order of the instruction circuit; and an input signal that is output from the instruction circuit. an output circuit that outputs a transmission signal; a delay circuit inserted between the instruction circuit and the output circuit; a determination circuit that determines whether or not there is a level change in the output signal of the instruction circuit; The timing clock is counted, and when the judgment circuit judges a change in the output level, it is reset, and when the counting is finished, the first counter circuit is set to a predetermined count value, and the oscillation circuit is reset. and a second counter circuit for stopping oscillation, and when transmitting the output signal from the instruction circuit to the output circuit, the output circuit delays the output signal by a certain period and outputs the transmission signal from the output circuit, and transmits the signal from the instruction circuit. A remote control transmitter characterized in that when the transmission of the output signal is stopped, the transmission of the output signal is stopped within a time shorter than the period during which the output signal is transmitted. 2. The remote control transmitter according to claim 1, wherein the interval between the transmission signals is longer than the time required for the second counter circuit to finish counting. 3. The instruction circuit outputs an output instruction to output the transmission signal from the time when the second counter circuit is reset by the transmission signal immediately before transmission interruption until the end of counting when an interval occurs in the transmission signal. A signal is generated, and a signal indicating that the output instruction signal is invalidated is generated before a time corresponding to a delay time of the delay circuit elapses after outputting the output instruction signal. The remote control transmitter according to item 1 or 2. 4. The determination circuit resets the second counter circuit by inputting the output signal and the output instruction signal, and resets the delay circuit by inputting a signal indicating that the output instruction signal is invalidated. 4. The remote control transmitter according to claim 1, wherein the remote control transmitter is configured to control the output instruction signal present in the output circuit so as not to output it to the output circuit.